ABSTRACT Purpose: To evaluate the predictive value of initial intraocular pressure difference of the detached and fellow eyes of patients with complex rhegmatogenous retinal detachment on postoperative persistent ocular hypotony. Methods: This retrospective observational study included 538 eyes of 538 unilateral complex rhegmatogenous retinal detachment patients with a proliferative vitreoretinopathy grade of C-1 or higher, treated with silicone oil endotamponade following pars plana vitrectomy. The patients were divided into Group A (patients having silicone oil removal without ocular hypotony; n=504) and Group B (patients with persistent ocular hypotony following silicone oil removal [n=8, 23.5%] and with retained silicone oil [n=26, 76.5%] due to the risk of persistent ocular hypotony; total n=34). Ocular hypotony was defined as an intraocular pressure of <6 mmHg on two or more occasions. Patients’ demographics, including age, sex, and follow-up time, and ocular characteristics, including ocular surgical and trauma history, initial and final best-corrected visual acuity, intraocular pressure and initial intraocular pressure difference of the detached and fellow eyes, and anatomical success rates and postoperative complications, were retrospectively collected from the electronic patient files. Results: The initial intraocular pressure was significantly lower in the detached eyes of Group B than in Group A (8.3 ± 3.5 vs. 12.9 ± 3.3, p<0.001). Also, the initial intraocular pressure difference was significantly higher in Group B than in Group A (8.9 ± 3.2 vs. 2.2 ± 2.7mmHg, p<0.001). The receiver operating characteristic curve analysis showed that the cutoff value of the initial intraocular pressure difference was 7.5mmHg for the risk of persistent ocular hypotony. The most influential factors on postoperative persistent ocular hypotony in the binary logistic regression analysis were the initial intraocular pressure difference and the need for a retinectomy. Conclusion: In eyes with complex rhegmatogenous retinal detachment treated with pars plana vitrectomy and silicone oil tamponade, the initial intraocular pressure difference could be of value in predicting postoperative persistent ocular hypotony and could guide surgeons on the decision of silicone oil removal. Purpose Methods 53 C1 C 1 C- n=504 n504 n 504 n=8, n8 8 [n=8 23.5% 235 23 5 n=26, n26 26 [n=26 76.5% 765 76 n=34. n34 n=34 . 34 n=34) 6 < occasions Patients demographics age sex followup follow up time characteristics history bestcorrected best corrected acuity complications files Results 8.3 83 3 (8. 35 3. vs 129 12 9 12. 33 3.3 p<0.001. p0001 p p<0.001 0 001 p<0.001) Also 8.9 89 32 2 22 2. 27mmHg 7mmHg 2.7mmHg 75mmHg 7 5mmHg retinectomy Conclusion tamponade n=50 n50 50 n=8 [n= 23.5 n=26 n2 [n=2 76.5 n3 n=3 8. (8 p000 p<0.00 00 n=5 n5 n= [n 23. n=2 76. ( p00 p<0.0 p0 p<0. p<0 p<

ABSTRACT Purpose: This study aimed to compare the safety and effectiveness of intraocular pressure reduction between micropulse transscleral cyclophotocoagulation and “slow cook” transscleral cyclophotocoagulation in patients with refractory primary open-angle glaucoma. Methods: We included patients with primary open angle glaucoma with at least 12 months of follow-up. We collected and analyzed data on the preoperative characteristics and postoperative outcomes. The primary outcomes were a reduction of ≥20% of the baseline value (criterion A) and/or intraocular pressure between 6 and 21 mmHg (criterion B). Results: We included 128 eyes with primary open-angle glaucoma. The preoperative mean intraocular pressure was 25.53 ± 6.40 and 35.02 ± 12.57 mmHg in the micropulse- and “slow cook” transscleral cyclophotocoagulation groups, respectively (p<0.001). The mean intraocular pressure was reduced significantly to 14.33 ± 3.40 and 15.37 ± 5.85 mmHg in the micropulse- and “slow cook” transscleral cyclophotocoagulation groups at the last follow-up, respectively (p=0.110). The mean intraocular pressure reduction at 12 months was 11.20 ± 11.46 and 19.65 ± 13.22 mmHg in the micropulse- and “slow cook” transscleral cyclophotocoagulation groups, respectively (p<0.001). The median preoperative logMAR visual acuity was 0.52 ± 0.69 and 1.75 ± 1.04 in the micropulse- and “slow cook” transscleral cyclophotocoagulation groups, respectively (p<0.001). The mean visual acuity variation was −0.10 ± 0.35 and −0.074 ± 0.16 in the micropulse- and “slow cook” transscleral cyclophotocoagulation, respectively (p=0.510). Preoperatively, the mean eye drops were 3.44 ± 1.38 and 2.89 ± 0.68 drugs in the micropulse- and “slow cook” transscleral cyclophotocoagulation groups, respectively (p=0.017), but those were 2.06 ± 1.42 and 1.02 ± 1.46 at the end of the study in the “slow cook” and micropulse transscleral cyclophotocoagulation groups, respectively (p<0.001). The success of criterion A was not significant between both groups. Compared with 11 eyes (17.74%) in the “slow cook” transscleral cyclophotocoagulation group, 19 eyes (28.78%) in the micropulse transscleral cyclophotocoagulation group showed complete success (p=0.171). For criterion B, 28 (42.42%) and 2 eyes (3.22%) showed complete success after micropulse- and “slow cook” transscleral cyclophotocoagulation, respectively (p<0.001). Conclusion: Both techniques reduced intraocular pressure effectively. Purpose slow cook openangle Methods 1 followup. followup follow up. up follow-up 20 ≥20 andor or B. B . B) Results 2553 25 53 25.5 640 40 6.4 3502 35 02 35.0 1257 57 12.5 p<0.001. p0001 p p<0.001 0 001 (p<0.001) 1433 14 33 14.3 340 3 3.4 1537 15 37 15.3 585 5 85 5.8 followup, up, p=0.110. p0110 p=0.110 110 (p=0.110) 1120 11.2 1146 46 11.4 1965 65 19.6 1322 13 22 13.2 052 52 0.5 069 69 0.6 175 75 1.7 104 04 1.0 010 10 −0.1 035 0.3 0074 074 −0.07 016 16 0.1 p=0.510. p0510 p=0.510 510 (p=0.510) Preoperatively 344 44 138 38 1.3 289 89 2.8 068 68 p=0.017, p0017 p=0.017 , 017 (p=0.017) 206 06 2.0 142 42 1.4 102 146 17.74% 1774 17 74 (17.74% 28.78% 2878 78 (28.78% p=0.171. p0171 p=0.171 171 (p=0.171) 42.42% 4242 (42.42% 3.22% 322 (3.22% Conclusion effectively ≥2 255 25. 64 4 6. 350 35. 125 12. p000 p<0.00 00 (p<0.001 143 14. 34 3. 153 15. 58 8 5. p011 p=0.11 (p=0.110 112 11. 114 196 19. 132 13. 05 0. 7 1. 01 −0. 03 007 07 −0.0 p051 p=0.51 51 (p=0.510 2. p001 p=0.01 (p=0.017 17.74 177 (17.74 28.78 287 (28.78 p017 p=0.17 (p=0.171 42.42 424 (42.42 3.22 32 (3.22 ≥ p00 p<0.0 (p<0.00 p01 p=0.1 (p=0.11 −0 p05 p=0.5 (p=0.51 p=0.0 (p=0.01 17.7 (17.7 28.7 (28.7 (p=0.17 42.4 (42.4 3.2 (3.2 p0 p<0. (p<0.0 p=0. (p=0.1 − (p=0.5 (p=0.0 17. (17. 28. (28. 42. (42. (3. p<0 (p<0. p=0 (p=0. (17 (28 (42 (3 p< (p<0 p= (p=0 (1 (2 (4 ( (p< (p= (p

RESUMO: A batata-doce é uma cultura importante para a segurança alimentar com mercado mundial em ascensão. Com base nas alterações fisiológicas das plantas em resposta às condições climáticas e à fertilização, este estudo avaliou os efeitos da época de cultivo (período chuvoso e seco) e de doses de P2O5 (0, 50, 100, 200 e 400 kg ha-1) na produtividade total e por classes comerciais, bem como, a composição química das raízes de armazenamento de duas cultivares de batata-doce. A produtividade de raízes tuberosas foi maior na estação chuvosa. As doses ótimas agronômica e econômica foram de 128 e 95 kg ha-1 de P2O5 para a cultivar Canadense. A cultivar Uruguaiana não respondeu a adubação fosfatada, mas suas raízes tiveram maiores teores de matéria seca, lipídios, fibras, açúcares totais e redutores e amido. O cultivo de batata-doce no período chuvoso com doses de até 100 kg ha-1 de P2O5 aumenta a produtividade de raízes em classes de maior valor econômico e com maiores teores de carboidratos. Estes resultados ajudam os produtores a planejarem o plantio e a colheita da batata-doce ao longo do ano e contribui para a gestão da aplicação de fertilizantes fosfatados. RESUMO batatadoce batata doce ascensão fertilização seco PO P P2O 0, 0 (0 50 20 40 ha1 ha 1 comerciais como batatadoce. doce. chuvosa 12 9 ha- Canadense fosfatada seca lipídios fibras amido 10 carboidratos fosfatados ( 5 2 4

ABSTRACT: Sweet potato is an important food security crop, and the world market for this root is on the rise. Based on the physiological changes in plants in response to climatic conditions and fertilization, this study evaluated the effects of the growing season (rainy and dry season) and P2O5 doses (0, 50, 100, 200 and 400 kg ha-1) on total yield, marketable classes yields, as well as chemical composition of storage roots of two sweet potato cultivars. The storage roots yield was greater in the rainy season. The optimum agronomic and economic doses were 128 and 95 kg ha-1 P2O5 for the cultivar Canadense. Cultivar Uruguaiana did not respond to phosphate fertilization, but its storage roots had higher contents of dry matter, lipids, fibers, total and reducing sugars, and starch. Sweet potato cultivation in the rainy season with doses up to 100 kg ha-1 P2O5 increase root yield in marketable size classes in higher economic value and with higher carbohydrate contents. The results can help producers schedule the planting and harvesting of sweet potatoes throughout the year and contribute to the seasonal management of phosphate fertilizer application. ABSTRACT crop rise fertilization PO P O P2O 0, 0 (0 50 20 40 ha1 ha 1 yields cultivars 12 9 ha- Canadense matter lipids fibers sugars starch 10 application ( 5 2 4

ABSTRACT: Plants’ physiology changes through the day because photoassimilates can increase water-soluble carbohydrate concentration in the afternoon compared to the morning. This study evaluated the harvest time effect on whole-plant corn silage morphological composition, particle size, fermentation profile, chemical composition, in vitro degradation, and estimated milk yield. A two-year agronomic assay was performed in a completely random design, and one experimental silo was produced by each parcel (n = 16). The afternoon harvest increased (P < 0.01) dry matter content compared to the morning harvest. Harvest time did not affect (P ≥ 0.32) corn grain, stalk, leaf proportion, and silage particle size. However, the morning harvest increased dry matter recovery (P = 0.01) and had no effect (P ≥ 0.10) on silage pH and concentrations of lactic and acetic acid compared to the afternoon harvest. In addition, afternoon harvest instead of morning harvest increased (P ≤ 0.05) silage starch, water-soluble carbohydrates, acid detergent lignin, and ether extract content and dry matter in vitro degradation. Controversially, treatments showed no effect (P ≥ 0.14) on silage energy concentration, estimated energy content, and milk yield. Thus, the morning harvest produces more silage dry matter, but the afternoon harvest improves corn silage’s nutritional value with no impact on estimated milk yield. ABSTRACT Plants watersoluble water soluble wholeplant whole plant composition size profile degradation yield twoyear two year design n 16. 16 . 16) P 0.01 001 0 01 0.32 032 32 grain stalk proportion However 0.10 010 10 addition 0.05 005 05 starch carbohydrates lignin Controversially 0.14 014 14 Thus silages s 1 0.0 00 0.3 03 3 0.1 0.

RESUMO: A fisiologia das plantas muda ao longo do dia porque os fotoassimilados podem aumentar a concentração de carboidratos solúveis em água à tarde em comparação com a manhã. Este estudo teve como objetivo avaliar o efeito do horário de colheita na composição morfológica da silagem de milho de planta inteira, tamanho de partícula, perfil de fermentação, composição química, degradação in vitro e estimativa da produção de leite. Um ensaio agronômico de dois anos foi realizado em delineamento inteiramente casualizado, e um silo experimental foi produzido por cada parcela (n = 16). A colheita da tarde aumentou (P < 0,01) o teor de matéria seca em relação à colheita da manhã. A época de colheita não afetou (P ≥ 0,32) a proporção de grãos, colmos e folhas do milho e o tamanho das partículas da silagem. Entretanto, a colheita da manhã aumentou (P = 0,01) a recuperação de matéria seca e não teve efeito (P ≥ 0,10) no pH da silagem e nas concentrações de ácido láctico e acético em comparação à colheita da tarde. Além disso, a colheita da tarde, em vez da colheita da manhã, aumentou (P ≤ 0,05) o amido da silagem, os carboidratos solúveis em água, a lignina detergente ácida e o teor de extrato etéreo e a degradação in vitro da matéria seca. Controversamente, os tratamentos não mostraram efeito (P ≥ 0,14) na concentração de energia da silagem, no conteúdo energético estimado e na produção de leite. Assim, a colheita da manhã produz mais matéria seca da silagem, mas a colheita da tarde melhora o valor nutricional da silagem de milho sem impacto na produção estimada de leite. RESUMO inteira partícula fermentação química leite casualizado n 16. 16 . 16) P 0,01 001 0 01 0,32 032 32 grãos Entretanto 0,10 010 10 disso 0,05 005 05 Controversamente 0,14 014 14 Assim 1 0,0 00 0,3 03 3 0,1 0,

Resumen Marco contextual: La participación del equipo en la acción educativa, problematizando su realidad profesional, mejora los conocimientos teóricos, lo que permite reducir el número de catéteres retirados prematuramente. Objetivo: Evaluar el efecto de una intervención educativa para el equipo de enfermería de una unidad de cuidados intensivos pediátricos para mejorar los conocimientos teóricos sobre la prevención de las complicaciones que causan la retirada no electiva del catéter central de inserción periférica. Metodología: Estudio cuasiexperimental mediante cuestionario antes y después de la intervención educativa, con aplicación de la prueba t Student Pareado, considerando un nivel de significación del 95% y valores p < 0,05 como significativos. Resultados: Aumento del conocimiento teórico tras la intervención educativa, con un aumento de la puntuación media de los técnicos de enfermería de 5,30 (DP = 1,49) para 9,10 (DP = 1,79) y dos enfermeros de 11,83 (DP = 2,12) para 20,67 (DP = 2,46). Conclusión: Se espera que este conocimiento teórico sobre la prevención de complicaciones se haga efectivo en la práctica asistencial, mejorando así las prácticas de mantenimiento y, en consecuencia, reduciendo la retirada prematura del catéter.

Resumo Enquadramento: A participação da equipe de enfermagem nas intervenções educativas utilizando a metodologia da problematização melhora o conhecimento teórico, reduzindo o número de cateteres retirados precocemente. Objetivo: Avaliar o efeito da intervenção educativa na equipa de enfermagem na unidade de terapia intensiva pediátrica na melhoria do conhecimento teórico sobre a prevenção de complicações que ocasionam a remoção não eletiva do cateter central de inserção periférica. Metodologia: Estudo quase-experimental com aplicação de questionário antes e após intervenção educativa, com aplicação do teste t de Student Pareado, considerando-se o nível de significância de 95% e os valores de p < 0,05 significativos. Resultados: Aumento do conhecimento teórico após intervenção, com aumento da média da pontuação dos técnicos em enfermagem de 5,30 (DP = 1,49) para 9,10 (DP = 1,79) e enfermeiros de 11,83 (DP = 2,12) para 20,67 (DP = 2,46). Conclusão: Espera-se que esse conhecimento teórico sobre a prevenção de complicações se efetive no ato de cuidar, promovendo a melhoria da prática de manutenção e, consequentemente, redução das perdas prematuras do cateter.

Abstract Background: The nursing team’s participation in educational interventions using the problematization methodology improves theoretical knowledge, reducing the number of catheters removed early. Objective: To evaluate the effect of an educational intervention on the nursing team of a pediatric intensive care unit in improving theoretical knowledge about the prevention of complications resulting from the unplanned removal of peripherally inserted central catheters. Methodology: A quasi-experimental study was conducted using a questionnaire before and after the educational intervention. The paired Student’s t-test was applied, with a significance level of 95% and a p-value of p < 0.05. Results: Theoretical knowledge increased significantly after the educational intervention. The mean score for nursing technicians increased from 5.30 (SD = 1.49) to 9.10 (SD = 1.79), while the mean score for nurses increased from 11.83 (SD = 2.12) to 20.67 (SD = 2.46). Conclusion: The theoretical knowledge about the prevention of complications should be used to improve catheter maintenance practices and reduce premature catheter loss.

ABSTRACT Introduction: the postgraduate educational climate (CE) in the hospital environment can determine the way in which resident physicians (MRs) adapt to their new stage, during which professional burnout syndrome (PAS) is highly likely to occur at some point. Objective: to determine the relationship between the educational climate and professional burnout in physicians in the medical residency programs of the National Hospital 2023-2024. Methodology: cross-sectional observational study of a sample of MR convenience of both sexes from all medical specialties of the National Hospital between November 2023 and January 2024, MR with external rotation and/or vacations were excluded. Sample calculation; 136 MR. An online form from Google was sent to the MR email requesting voluntary participation. The SAP was measured with the standard Maslach Burnout Inventory (MBI) method with subscales; emotional exhaustion (EA), depersonalization (DESP), personal fulfillment (PR), with PAS with high scores of AE, DESP and low RP. The EC was assessed with the measure of the hospital postgraduate educational environment (PHEEM) with subscales; perception of role autonomy (PAR), perception of teaching (PE), perception of social support (PSS), the higher the score, the better the EC. Demographic and academic variables, MBI and PHEEM scores were collected, and the SAP was considered dependent, as the main result was the predictive relationship of the PHEEM on the SAP. Data were compared with χ², t-test or Mann-Whitney U, ANOVA and linear regression (p-significant value =<0.05). Results: of 233 participants, the mean age was 28.75 (±2.20), 63.94 % (149) women, the general prevalence of PAS; 70.38 % (164/233), PAS in men 75 % (63/84) and women 67.78 % (101/149) p=0.0014, the first 2 years with the highest frequency of PAS; 65 (85.52 %), 59 (86.76 %) respectively p=0.0009, 63 (90 %) p=0.0071 surgical specialties. The subscales of the MBI, the AE; 79.82 % (186) with an average of 35.39 (± 11.61) points. The CE of MRs with SAP; 107.9 (19.6) dots and without PAS; 136.3 (12.1) dots 95 % CI 18.1-25.0 p= 0.0001. The PHEEM predicted the AE with R2=0.619, B= -0.18 (±0.009) p=0.001, and the DESP; R2= 0.385, B= -0.001(0.004) p=0.009, PSS being a significant predictor with inverse correlation in both. Conclusion: there is an inverse relationship between the educational climate and burnout syndrome in the population studied, with a high prevalence of burnout in male residents of surgical specialties, with the social support of the hospital educational environment being a significant predictor for the development of burnout syndrome.

RESUMEN Introducción: el clima educacional (CE) de posgrado en el ambiente hospitalario puede determinar la manera en como los médicos residentes (MR) se adaptan a su nueva etapa, durante el cual el sindrome agotamiento profesional (SAP) es altamente probable de producirse en algún momento. Objetivo: determinar la relación entre el clima educacional y el agotamiento profesional en médicos de los programas de residencias médicas del Hospital Nacional 2023-2024. Metodología: estudio observacional transversal de una muestra por conveniencia de MR de ambos sexos de todas las especialidades médicas del Hospital Nacional entre noviembre 2023 y enero 2024, se excluyeron MR con rotación externa y/o vacaciones. Calculo muestral; 136 MR. Se envío un formulario en línea de Google al correo electrónico del MR solicitando la participación voluntaria. El SAP fue medido con el método estándar Maslach Burnout Inventory (MBI) con subescalas; agotamiento emocional (AE), despersonalización (DESP), realización personal (RP), existiendo SAP con puntuaciones altas de AE, DESP y bajas de RP. El CE fue valorado con la medida del entorno educativo de posgrado hospitalario (PHEEM) con subescalas; percepción autonomía de roles (PAR), percepción enseñanza (PE), percepción soporte social (PSS), a mayor puntaje mejor CE. Se recopiló variables demográficos, académicos, puntajes del MBI y PHEEM, el SAP fue considerado dependiente, como resultado principal la relación predictiva del PHEEM sobre el SAP. Se compararon datos con χ², prueba t o U de Mann-Whitney, ANOVA y regresión lineal (p-valor significativo =<0,05). Resultados: de 233 participantes, la edad media fue de 28,75 (± 2,20), el 63,94 % (149) mujeres, la prevalencia general del SAP; 70,38 % (164/233), SAP en hombres 75 % (63/84) y mujeres 67,78 % (101/149) p=0,0014, los 2 primeros años con mayor frecuencia de SAP; 65 (85,52 %), 59 (86,76 %) repectivamente p=0,0009, de especialidades quirúrgicas 63 (90 %) p=0,0071. Las subescalas del MBI el AE;79,82 % (186) con un promedio de 35,39 (± 11,61) puntos. El PHEEM de los MR con SAP; 107,9(( 19,6) puntos y sin SAP; 136,3(( 12,1) puntos IC 95 % 18,1-25,0 p= 0,0001. El PHEEM predijo el AE con R2=0,619, PPS; B= -0,18 (±0,009) p=0,001, y la DESP; R2= 0,385, PPS; B= -0,001 (±0,004) p=0,009 siendo PSS predictor significativo con correlación inversa en ambas. Conclusión: existe relación inversa entre el clima educativo y el sindrome de agotamiento profesional en la población estudiada, con alta prevalencia de este en residentes hombres de especialidades quirúrgicas, siendo el soporte social del ambiente educativo hospitalario un predictor significativo para el desarrollo del sindrome de agotamiento profesional.

Abstract Jouni-Matti Kuukkanen has theorized that narrative does not involve rational content. Rather, he suggested, narrative is only a descriptive practice consisting of singular statements. Kuukkanen thus divorced the rational and narrative frameworks, arguing that historiography belongs to the former and not the latter. This article establishes a new conceptual framework that provides a revised understanding of narrative as a rational practice. I argue that the principles of organization brought to light by the Gestalt school of experimental psychology illuminate the underlying organizational logic that historians engage with when constructing narratives. To illustrate how these principles operate in historical narratives and how they are rational, I examine classic historical works such as Karl Marx’s introduction of the concept of surplus value; Giambattista Vico’s Autobiography and Jacob Burckhardt’s The Civilization of the Renaissance; Reinhart Koselleck’s Futures Past; and E. P. Thompson’s The Making of the English Working Class and Johan Huizinga’s Waning of the Middle Ages. My analysis shows that narrative entails its own kind of explanatory structure. It is a way of thinking that provides meaning and structure to that which is otherwise unstructured and undetermined. Finally, my new framework offers a foundation for the rational evaluation of narratives by showing how the context of discovery and the context of justification cannot be separated in the case of narrative histories.

Resumen Jouni-Matti Kuukkanen ha teorizado que las narrativas no involucran un tipo de actividad racional, en cambio, parecieran ser sólo una práctica descriptiva que consiste en afirmaciones singulares. Es así que Kuukkanen separa el marco racional del narrativo, argumentando que la historiografía pertenece al primero y no al segundo. Este artículo establece un nuevo marco conceptual que proporciona una comprensión revisada de la narrativa como práctica racional. Sostengo que los principios de organización sacados a la luz por la escuela de psicología experimental de la Gestalt iluminan la lógica organizacional subyacente con la que se involucran los historiadores cuando construyen narrativas. Para ilustrar cómo operan estos principios en las narrativas históricas y cómo son racionales, examino obras históricas clásicas como la introducción del concepto de plusvalía de Karl Marx; la Autobiografía de Giambattista Vico y La civilización del Renacimiento en Italia de Jacob Burckhardt; Futuro Pasado de Reinhart Koselleck; y La formación de la clase obrera en Inglaterra de E.P Thompson y El Otoño de la Edad Media de Johan Huizinga. Mi análisis muestra que la narrativa implica su propio tipo de estructura explicativa ya que es una forma de pensar que proporciona significado y estructura a lo que de otro modo está desestructurado y es indeterminado. Finalmente, mi nuevo marco ofrece una base para la evaluación racional de las narrativas al mostrar cómo el contexto de descubrimiento y el contexto de justificación no pueden separarse en el caso de las historias narrativas.

Resumen Este estudio, se centra en la cobertura forestal de tres distritos en el ámbito urbano de la provincia de Andahuaylas, región Apurímac en Perú, la cual afronta problemas de deforestación. El objetivo fue determinar la cobertura forestal en el área urbana de la provincia de Andahuaylas hasta el 2030, para la revelación de los escenarios futuros de la cobertura forestal, contribuyendo al desarrollo de la planificación urbana y a la creación de ciudades sostenibles. Para el área de estudio, se utilizaron datos registrados entre los años 2017-2023, a partir de las imágenes NDVI del portal Sentinelhub. Permitiendo disponer de información de bosques tropicales y templados; arbustos y pastizales; zonas áridas de roca; áreas urbanas o artificiales que han cambiado como consecuencia del proceso de urbanización. Se determinaron las superficies de bosque en el área de estudio. Posteriormente se utilizó la regresión lineal con un p valor = 0,046, alcanzando un R2 de 0,583 en un rango medio, logrando estimar los escenarios futuros del bosque al 2030. Se concluye que la tendencia es decreciente en la cobertura forestal en 26,50% al año 2030.

Absttract This study focuses on the forest cover of three districts in the urban area of the province of Andahuaylas, Apurímac region, Peru, which is facing deforestation problems. The objective was to determine the forest cover in the urban area of the province of Andahuaylas until 2030, to reveal future scenarios of forest cover, contributing to the development of urban planning and the creation of sustainable cities. For the study area, data recorded between the years 2017-2023 were used, based on NDVI images from the Sentinelhub portal. This allowed for the availability of information on tropical and temperate forests, shrubs and grasslands, arid rock zones, and urban or artificial areas that have changed due to the urbanization process. The forest surfaces in the study area were determined. Subsequently, linear regression was used with a p-value = 0,046, reaching an R2 of 0,583 in a medium range, managing to estimate future forest scenarios by 2030. It is concluded that the trend is decreasing in forest cover by 26,50% by the year 2030.

Resumo: Introdução: A doença hepática gordurosa não alcoólica é uma das principais causas de doença hepática. A citoqueratina 18 surge como um marcador não invasivo para avaliação de fibrose hepática. O objetivo do trabalho foi validar o uso da citoqueratina 18 no sangue periférico no diagnóstico e evolução de pacientes com doença hepática gordurosa não alcoólica. Metodologia: Para validar a citoqueratina 18 no diagnóstico, foi realizado um estudo caso-controle. O grupo caso foi composto por pacientes maiores de 18 anos, de ambos os sexos, com diagnóstico de doença hepática gordurosa não alcoólica ligada à síndrome metabólica, recrutados entre 02/02/2019 a 02/02/2020. O grupo controle eram doadores de sangue. Eles foram comparados em 1 a 1 por idade e sexo. A citoqueratina 18 foi quantificada no sangue periférico de ambos os grupos. Para validar a citoqueratina 18 na evolução de pacientes com doença hepática gordurosa não alcoólica, foi realizado um estudo prospectivo e longitudinal. O grupo de pacientes recrutados foi acompanhado durante um ano sob tratamento padrão, ao final do qual a citoqueratina 18 foi quantificada no sangue periférico. As variáveis contínuas são expressas com média e desvio padrão. Foi analisado com teste t de Student, erro α < 5%. Resultados: Compõem o grupo caso 13 pacientes (12 mulheres), 53 ± 11 anos, com IMC 35,01 ± 8,9 kg/m2. O valor de citoqueratina 18 pré-tratamento foi de 1410 ± 120 UI e o valor pós-tratamento foi de 117 ± 56, p < 0,005. O grupo controle foi de 13 pessoas (12 mulheres), 43,4 ± 8,1 anos e IMC 28,10 ± 5,4 kg/m2 O valor da citoqueratina 18 foi de 193 ± 7,2 UI, p < 0,005 vs. grupo de casos pré-tratamento. Conclusões: A citoqueratina 18 é maior em pacientes com doença hepática gordurosa não alcoólica, sendo estatisticamente significativa, e diminui com o tratamento com significância estatística, podendo se tornar um marcador útil neste grupo de pacientes.

Abstract: Introduction: Nonalcoholic fatty liver disease is one of the main causes of liver disease. Cytokeratin 18 emerges as a non-invasive marker for the assessment of liver fibrosis. The objective of the work was to validate the use of cytokeratin 18 in peripheral blood in the diagnosis and evolution of patients with non-alcoholic fatty liver disease. Methodology: To validate cytokeratin 18 in the diagnosis, a case-control study was carried out. The case group was patients over 18 years of age, of both sexes, with a diagnosis of non-alcoholic fatty liver disease linked to metabolic syndrome, recruited between 2/2/2019 to 2/2/2020. The control group were blood donors. They were matched 1-1 for age and sex. Cytokeratin 18 was quantified in peripheral blood of both groups. To validate cytokeratin 18 in the evolution of patients with non-alcoholic fatty liver disease, a prospective, longitudinal study was carried out. The group of patients recruited were followed for one year under standard treatment, at the end of which cytokeratin 18 was quantified in peripheral blood. Continuous variables are expressed with the mean and standard deviation. It was analyzed with Student's t test, α error < 5%. Results: 13 patients make up the case group (12 women), 53 ± 11 years old, with BMI 35.01 ± 8.9 kg/m2. The pre-treatment cytokeratin 18 value was 1410 ± 120 IU, and the post-treatment value was 117 ± 56, p < 0.005. The control group was 13 people (12 women), 43.4 ± 8.1 years and BMI 28.10 ± 5.4 kg/m2 The cytokeratin 18 value was 193 ± 7.2 IU, p < 0.005 vs. pretreatment case group. Conclusions: Cytokeratin 18 is higher in patients with non-alcoholic fatty liver disease, being statistically significant, and decreases with treatment with statistical significance, and may become a useful marker in this group of patients.

Resumen: Introducción: La enfermedad por hígado graso no alcohólico es una de las principales causas de afección hepática. La citoqueratina 18 surge como marcador no invasivo para la valoración de fibrosis hepática. El objetivo del trabajo fue validar el uso de la citoqueratina 18 en sangre periférica en el diagnóstico y evolución de los pacientes con enfermedad por hígado graso no alcohólico. Metodología: Para validar la citoqueratina 18 en el diagnóstico se realizó un estudio de tipo caso-control. El grupo caso fueron los pacientes mayores de 18 años, de ambos sexos, con diagnóstico de enfermedad por hígado graso no alcohólico vinculado al síndrome metabólico, captados entre 2/2/2019 al 2/2/2020. El grupo control fueron personas donantes de sangre. Se parearon 1-1 por edad y sexo. Se cuantificó la citoqueratina 18 en sangre periférica de ambos grupos. Para validar la citoqueratina 18 en la evolución de los pacientes con enfermedad de hígado graso no alcohólico se realizó un trabajo prospectivo, longitudinal. El grupo de pacientes captados fueron seguidos durante un año bajo tratamiento estándar, finalizando el mismo se realizó la cuantificación de citoqueratina 18 en sangre periférica. Las variables continuas se expresan con la media y desvío estándar. Se analizó con test de t Student, error α < 5% Resultados: 13 pacientes integran el grupo caso (12 mujeres), de 53 ± 11 años, con IMC 35.01 ± 8.9 kg/m2. El valor de citoqueratina 18 pre-tratamiento fue de 1410 ± 120 UI, y el valor post-tratamiento fue de 117 ± 56, p < 0,005.El grupo control fueron 13 personas (12 mujeres), de 43,4 ± 8,1 años e IMC 28,10 ± 5,4 kg/m2 El valor de citoqueratina 18 fue de 193 ± 7.2 UI, p < 0.005 vs grupo caso pretratamiento. Conclusiones: La citoqueratina 18 es más elevada en los pacientes con enfermedad hígado graso no alcohólico, siendo estadísticamente significativa y disminuye con el tratamiento con significación estadística, pudiendo constituirse en un marcador útil en este grupo de pacientes.

Abstract The organic composition of 65 °% of urban solid waste of the Metropolitan District of Quito originates from food waste, which has negative environmental effects. The purpose of this study was to evaluate the factors related to food waste in homes in the capital and characterize urban solid waste management. The study is quantitative and exploratory. An association analysis was performed for the main categorical variables through calculation of statistical chi squared and an assessment of polychoric relation. A descriptive and multi-scale statistical analyses were performed for focus of the social metabolism to characterize waste management. A noteworthy element was the relation between expenses for purchase of food and non-alcoholic beverages in the last month-household income in the last month (p value < 5 %). Between 2012-2021, the most representative median for waste generation corresponded to the Eugenio Espejo administration, with 141470 t/ year, with a metabolic waste rate of 2.45E-05 (t/year). On the other hand, the Tumbaco administration obtained 30217 t/year and 1.22E-05 t/year, respectively.

Resumen La composición orgánica del 65 % de residuos sólidos urbanos del Distrito Metropolitano de Quito proviene de restos de alimentos, lo que provoca efectos medioambientales negativos. El propósito de esta investigación es evaluar los factores que inciden en el desperdicio de alimentos en los hogares capitalinos y caracterizar la gestión de sus residuos sólidos urbanos. La investigación es cuantitativa de tipo exploratoria. Se realizó un análisis de asociación entre las principales variables categóricas mediante el cálculo del estadístico chi-cuadrado y una evaluación de correlación policórica. Se aplicaron análisis estadístico descriptivo y multiescala del enfoque del metabolismo social para caracterizar la gestión de residuos. Destaca la relación entre el gasto en compra de alimentos y bebidas no alcohólicas en el último mes -ingreso del hogar en el último mes (p valor < 5 %). Entre 2012-2021, la mediana más representativa de generación de residuos corresponde a la administración Eugenio Espejo, con 141 470 t/año, y su tasa metabólica de residuos de 2,45E-05 t/año. En contraste, la administración Tumbaco obtuvo 30 217 t/año y 1,22E-05 t/año, respectivamente.

Resumo A composição orgânica do 65 °% dos resíduos sólidos urbanos do Distrito Metropolitano de Quito provém de restos de alimentos, o qual provoca efeitos negativos ao meio ambiente. O objetivo dessa investigação foi avaliar os fatores incidentes no desperdício de alimentos nos lares da capital e caracterizar a gestão dos resíduos sólidos urbanos. A pesquisa foi quantitativa e exploratória. Fez-se uma análise de associação das variáveis principais com o cálculo do chi-quadrado estatístico e uma avaliação da correlação policórica. Usaram-se análises estadísticos descritivos e multiescala do foco do metabolismo social para caracterizar a gestão dos resíduos. Destacou-se a relação do gasto para a compra de alimentos e bebidas não alcoólicas no último mês -rendas do lar no último mês (p valor < 5 %). Entre os anos 2012-2021, a mediana mais representativa de geração de resíduos foi da administração Eugenio Espejo, com 141 470 t/ano, e uma taxa metabólica de resíduos de 2,45E-05 t/ano. Em contraste, a administração Tumbaco teve 30 217 t/ano e 1,22E-05 t/ano, respetivamente.

Resumo: Introdução : A anemia é um distúrbio altamente prevalente. A anemia pré-operatória está associada a maior mortalidade, mais complicações, tempo prolongado de internação e maiores custos de saúde. A transfusão de glóbulos vermelhos (TGV) não melhora esses resultados. A Organização Mundial da Saúde recomenda a implementação de medidas de Gerenciamento de Sangue do Paciente (GSP), pois permitem melhorar esses resultados clínicos, reduzir TGV desnecessárias e economizar custos. Apesar da evidência contundente, a implementação dessas medidas ainda está aquém de ser efetivada. O objetivo deste trabalho é realizar uma análise da situação para conscientizar sobre o problema e incentivar a implementação dessas medidas. Metodologia: Foi realizado um estudo observacional, longitudinal, retrospectivo de coorte histórica, unicêntrico. Foram incluídos todos os pacientes submetidos a cirurgias de coordenação de 01/01/2022 a 01/04/2022 no Hospital de Clínicas. Critérios de exclusão: ausência de hemograma nos três meses anteriores à cirurgia e recusa em participar do estudo. Resultados: Foram analisadas um total de 329 cirurgias. 52 a cada 100 procedimentos foram realizados em pacientes com anemia. Foi encontrada uma associação estatisticamente significativa entre a anemia pré-operatória e a recepção de TGR durante a internação. OR 11,746 (4,518 - 30,540). A anemia e as TGR prolongaram significativamente a internação hospitalar. Dias de internação em função da condição do paciente: Sem anemia: 10,1 ± 1,1 dias, com anemia: 27,2 ± 2,3 dias. Valor p < 0,001. Não transfundidos: 14,5 ± 1,3 dias, transfundidos: 41,8 ± 4,4 dias. Valor p < 0,001. Apenas 49 (28,6%) dos 171 pacientes com anemia tinham metabolismo do ferro antes da cirurgia. Dos 140 pacientes com Hb < 12 mg/dL submetidos a cirurgias com sangramento não insignificante, 4 receberam tratamento específico para otimizar a Hb. Foram administradas um total de 185 unidades de glóbulos vermelhos (UGV) durante a internação. 49 em pacientes instáveis (intraoperatório ou hemorragia aguda) e 136 em pacientes estáveis. Da análise desses últimos, 42,5% dos pacientes receberam 3 ou mais UGV. A hemoglobina pré-transfusional média foi de 7,0 ± 0,1. Foi encontrada uma associação estatisticamente significativa entre receber UGV e falecer durante a internação. OR 17,182 (3,360 - 87,872). Conclusões: Foi realizado uma análise da situação na qual foi observada uma elevada prevalência de anemia pré-operatória, um estudo e tratamento escasso da anemia antes das cirurgias e uma quantidade excessiva de UGV recebidas por alguns pacientes. Este trabalho estabelece a necessidade de implementar programas de Gerenciamento de Sangue do Paciente para reduzir a prevalência de anemia pré-operatória e melhorar nossas práticas transfusionais. Além disso, estabelece um quadro comparativo para avaliar o progresso dessas medidas e aponta possíveis indicadores para avaliar os benefícios de sua implementação.

Abstract: Introduction: Anemia is a highly prevalent disorder. Preoperative anemia is associated with higher mortality, more complications, longer hospital stays, and higher healthcare costs. Red blood cell transfusion (RBC) does not improve these outcomes. The World Health Organization recommends implementing Patient Blood Management (PBM) programmes, as they can improve these clinical outcomes, reduce unnecessary RBC transfusions, and save costs. Despite compelling evidence, the implementation of these measures has yet to be effectively achieved. The objective of this study is to conduct a situational analysis to raise awareness about this issue and encourage the implementation of these measures. Methodology: An observational, longitudinal, retrospective cohort study was conducted at a single center. All patients undergoing elective surgery from 01/01/2022 to 01/04/2022 at the Hospital de Clínicas were included. Exclusion criteria: absence of a complete blood count in the three months prior to surgery and refusal to participate in the study. Results: A total of 329 surgeries were analyzed. 52 out of 100 procedures were performed on patients with anemia. A statistically significant association was found between preoperative anemia and receiving RBC transfusion during hospitalization. OR 11.746 (4.518 - 30.540). Anemia and RBC transfusions significantly prolonged hospital stay. Length of hospitalization based on patient condition: No anemia: 10.1 ± 1.1 days, with anemia: 27.2 ± 2.3 days. Value of p < 0.001. Non-transfused: 14.5 ± 1.3 days, transfused: 41.8 ± 4.4 days. Value of p < 0.001. Only 49 (28.6%) of the 171 patients with anemia had iron metabolism assessed before surgery. Among the 140 patients with Hb < 12 g/dL undergoing surgeries with non-insignificant bleeding, only 4 received specific treatment to optimize Hb. A total of 185 units of red blood cells (RBC) were administered during hospitalization. 49 to unstable patients (intraoperative or acute hemorrhage) and 136 to stable patients. From the analysis of the latter group, 42.5% of the patients received 3 or more RBC units. The average pre-transfusion hemoglobin was 7.0 ± 0.1. A statistically significant association was found between receiving RBC units and dying during hospitalization. OR 17.182 (3.360 - 87.872). Conclusiones: A situational analysis was conducted, revealing a high prevalence of preoperative anemia, scarce study and treatment of anemia before surgeries, and an excessive amount of blood transfusions received by some patients. This work establishes the need to implement Patient Blood Management programs to reduce the prevalence of preoperative anemia and improve our transfusion practices. It also sets a comparative framework to evaluate the progress of these measures and indicates possible indicators to assess the benefits of their implementation.

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Resumen (Objetivo). Se evaluó el manglar de Chacarita en el Pacífico Central de Costa Rica, a través de la composición florística y las poblaciones de moluscos asociados de interés comercial, con el fin de proponer actividades de aprovechamiento sustentables en el manglar. (Metodología). Mensualmente y durante un año, se realizaron visitas al área de estudio, con el propósito de establecer una base florística de árboles de mangle y medir el almacenamiento de carbono en el lugar, además, de recolectar moluscos bivalvos para analizar el estado de las poblaciones, con base en las abundancias de organismos hallados y otras características como las longitudes y la masa de estos. En los mangles, se obtuvo el diámetro de la altura de pecho (DAP en cm), la altura (m), el índice de valor de importancia (IVI) y las reservas de carbono (Mg C·ha-1). En cuanto a los moluscos, se examinaron cuatro especies de interés comercial, evaluando la longitud (cm), la masa (g) y el índice gonadosomático. Finalmente, se realizaron valoraciones económicas de los datos obtenidos en el manglar, del turismo e información histórica de pesca para el acopio de Chacarita. (Resultados). Se hallaron cinco especies de mangles, Rhizophora mangle, Rizophora racemosa, Laguncularia racemosa, Avicennia germinans y Pelliciera rhizophorae; P. rhizophorae fue la de mayor índice de valor de importancia. Se obtuvo un almacenamiento de carbono equivalente a 78.49 Mg C·ha-1. Se contabilizaron 357 organismos, de los cuales el 18 % correspondió a Anadara similis, 37.5 % a Anadara tuberculosa, 41.46 % a Leukoma spp. y 3.08 % a Mytella guyanensis. Tomando en cuenta el valor económico de las reservas de carbono y los moluscos bivalvos presentes en los muestreos, se obtuvieron valoraciones económicas de 9812.63 USD·ha-1 y 28 USD·ha-1, respectivamente. (Conclusiones). Las bajas densidades poblacionales de moluscos, especialmente del género Anadara, hacen necesario establecer medidas de gestión que permitan recuperar las poblaciones de estos. La presente investigación propone actividades de aprovechamiento sustentables, como turismo comunitario con fines educativos y culturales.

Resumo (Objetivo). O mangue de Chacarita, no Pacífico Central da Costa Rica, foi avaliado por meio da composição florística e das populações de moluscos associados de interesse comercial, com o objetivo de propor atividades de uso sustentável no mangue. (Metodologia). Foram feitas visitas mensais à área de estudo durante um ano para estabelecer uma base florística de árvores do mangue e medir o armazenamento de carbono no local, bem como para coletar moluscos bivalves para analisar o status das populações, com base na abundância de organismos encontrados e em outras características, como comprimento e massa de tais organismos. Nos manguezais, foram obtidos o diâmetro à altura do peito (DAP em cm), a altura (m), o índice de valor de importância (IVI) e as reservas de carbono (Mg C-ha-1). No que diz respeito aos moluscos, foram examinadas quatro espécies de interesse comercial., avaliando o comprimento (cm), a massa (g) e o índice gonadossomático. Por fim, foram feitas avaliações econômicas de dados de mangue, turismo e informações históricas de pesca para a coleção Chacarita. (Resultados). Foram encontradas cinco espécies de mangue, Rhizophora mangle, Rizophora racemosa, Laguncularia racemosa, Avicennia germinans e Pelliciera rhizophorae; a P. rhizophorae apresentou o índice de valor de importância mais alto. Foi obtido um armazenamento de carbono equivalente a 78.49 Mg C-ha-1. Foram calculados um total de 357 organismos, dos quais 18% correspondeu a Anadara similis, 37.5% Anadara tuberculosa, 41.46% Leukoma spp. e 3.08% Mytella guyanensis. Levando em conta o valor econômico das reservas de carbono e dos moluscos bivalves presentes nas amostras, foram obtidas avaliações econômicas de US$ 9812.63 ha-1 e US$ 28 ha-1, respectivamente. (Conclusões). As baixas densidades populacionais de moluscos, especialmente do gênero Anadara tornam necessário o estabelecimento de medidas de manejo para permitir a recuperação dessas populações. Esta pesquisa propõe atividades de uso sustentável, como o turismo comunitário para fins educacionais e culturais.

Abstract (Objective). The floristic composition and populations of associated molluscs of commercial interest of the Chacarita mangrove forest on the Central Pacific of Costa Rica were evaluated to guide proposals for sustainable exploitation activities in the mangrove forest. (Methodology). Monthly visits to the study area were conducted for one year to establish a floristic baseline of mangrove trees and measure carbon storage. Additionally, bivalve molluscs were collected to analyze the state of their populations based on the abundances of organisms found, as well as other characteristics such as length and mass. Data regarding the mangrove trees included their diameter at breast height (DBH, cm), height (m), importance value index (IVI), and carbon reserves (Mg C·ha-1). Four mollusc species of commercial interest were analyzed, using data on their length (cm), weight (g), and gonodosomatic index. Economic evaluations were also conducted using data obtained from the mangrove forest, as well as tourism and historical fishing data for the collection of Chacarita. (Results). Five species of mangroves were identified: Rhizophora mangle, Rizophora racemosa, Laguncularia racemosa, Avice germinans, and Pelliciera rhizophorae, while P. rhizophorae had the highest importance value index. The study revealed a carbon storage equivalent to 78.49 Mg C·ha-1. A total of 357 organisms were counted, with Anadara similis accounting for 18% of the total count, followed by Anadara tuberculosa (37.5%), Leukoma spp. (41.46%), and Mytella guyanensis (3.08%). When considering the economic value of carbon stocks and the bivalve molluscs obtained from the samples, economic valuations of 9,812.63 USD·ha-1 and 28 USD·ha-1 were determined, respectively. (Conclusions). The low population densities of molluscs, particularly those belonging to the Anadara genus, necessitate the establishment of management measures to facilitate the recovery of these mollusk populations. This research proposes sustainable use activities such as community tourism for educational and cultural purposes.

Abstract Introduction: This experimental study focuses on the cognitive development of children and its association with nutrition. The semantic associations of boys and girls aged 6-13 years from nine different cities in Colombia (N = 454) were analyzed. Method: The design is exploratory and descriptive correlational cross-sectional. The study utilized a discrete free association task, instructing participants to respond to a critical word with the first five words that came to mind. The task covered 100 Spanish food words and 20 brands of food products. Results: J-values are presented by age, socioeconomic status, gender and grade level. The identification of significant similarities (p-value < .001) between the distributions of critical words and the most frequently emitted (f), highlighted the hedonic influence on children’s food preferences, identifying 20 frequent descriptors of pleasure or hedonic topics in food consumption, with terms such as sweet (f = 234) and rich (f = 104) standing out. Conclusions: The study observed a population misinterpretation of the concept healthy (f = 52) in relation to food. The analysis of semantic associations for the top 20 infant food brands, supported by Jaccard’s index, revealed ten significant connections for each brand. These findings suggest important implications for understanding organoleptic food and product learning processes in childhood. The study emphasizes the importance of addressing hedonic perceptions and fostering a more precise understanding of health-related concepts within the realm of children’s dietary preferences.

Resumen Introducción: Este estudio experimental, centrado en el desarrollo cognitivo infantil y su relación con la nutrición, analizó las asociaciones semánticas de niños y niñas de nueve diferentes ciudades en Colombia con edades comprendidas entre 6 y 13 años (N = 454). Método: Esta investigación tiene un diseño exploratorio, descriptivo correlacional transeccional, basado en una tarea de asociación libre discreta, que consistió en instruir a los participantes para que respondieran a una palabra crítica con las cinco primeras palabras que pensaran, abarcando 100 palabras de alimentos en español y 20 marcas de productos alimenticios. Resultados: Se muestra el valor J por edad, estrato socioeconómico, género y grado académico. Las similitudes significativas (p-value < .001) entre las distribuciones de palabras críticas y las emitidas con mayor frecuencia (f) destacaron la influencia hedónica en las preferencias alimenticias de los niños. En efecto, se identificaron 20 descriptores frecuentes del placer o tópicos hedónicos en el consumo de alimentos, sobresaliendo términos como dulce (f =234) y rico (f = 104). Conclusiones: Se observó una interpretación errónea de la población sobre el significado del concepto saludable (f = 52) en relación con la alimentación. El análisis de las asociaciones semánticas para las 20 principales marcas de alimentos infantiles, respaldado por el índice de Jaccard, proporcionó diez conexiones significativas por cada marca. Estos hallazgos sugieren implicaciones importantes para entender los procesos de aprendizaje organoléptico de alimentos y productos en la infancia, subrayando la necesidad de abordar las percepciones hedónicas y promover una comprensión más precisa de los conceptos relacionados con la salud en el contexto alimentario infantil.

Abstract: The objective of this study is to analyze the relationship between usability and satisfaction in university students using ChatGPT. Since its launch, the use of ChatGPT by university students has increased significantly in most universities around the world. This software can generate answers to any type of question, emulating the experience of interacting with a real person. A survey with Likert-type questions is applied to 250 university students and a covariance-based structural equation model is constructed. The results show and adjusted model with factor loadings and an acceptable Cronbach's Alpha (usability α=0.80 and satisfaction α=0.85), CFI=0.921 and RMSA=0.0112. The p-value of the Kolmogorov-Smirnov normality test is 0.0245. In conclusion, the results of the model allowed accepting the research hypothesis-there is a positive and direct relationship between usability and satisfaction.

Resumen: El objetivo de este estudio es analizar la relación entre usabilidad y satisfacción en estudiantes universitarios que utilizan ChatGPT. Desde su lanzamiento, el uso de ChatGPT por parte de estudiantes universitarios se ha incrementado notablemente en la mayoría de universidades del mundo. Este software puede generar respuestas a cualquier tipo de pregunta, emulando la experiencia de estar interactuando con una persona real. Se aplica una encuesta con preguntas tipo Likert a 250 estudiantes universitarios y se construye un modelo de ecuaciones estructurales basado en covarianzas. Los resultados muestran un modelo ajustado con cargas factoriales y un Alfa de Cronbach aceptable (usabilidad α=0.80 y satisfacción α=0.85), CFI=0.921 y RMSA=0.0112. El valor p de la prueba de normalidad de Kolmogorov-Smirnov es de 0.0245. En conclusión, los resultados del modelo permiten aceptar la hipótesis de investigación, existe una relación positiva y directa entre usabilidad y satisfacción.

SUMMARY OBJECTIVE: The aim of this study was to demonstrate the effect of coronavirus disease 2019 on the cardiovascular autonomic system using heart rate variability in young individuals. METHODS: The study was designed retrospectively by scanning the 24-h Holter electrocardiography records of patients who applied to the Ankara Abdurrahman Yurtaslan Oncology Education and Research Hospital Cardiology outpatient clinic. The study group consisted of 492 patients under the age of 40 years, who did not have additional comorbidities or medication use and had prolonged symptoms after coronavirus disease 2019 during the pandemic. The control group, including 401 patients, was determined during the pre-pandemic period (before December 2019). Heart rate variability parameters were evaluated by scanning the 24-h Holter electrocardiography records of the patients and compared with the non-coronavirus disease 2019 group. RESULTS: The median age of participants was 30 years. Standard deviation of normal RR intervals (SDNN) ≤100 ms was more prevalent in the study group (27 (6.7%) vs 73 (14.8%), p<0.001). In univariate logistic regression analysis, the presence of coronavirus disease 2019 [(OR 2.41, 95%CI 1.52–3.83), p<0.001] and age [(OR 1.04, 95%CI 1.01–1.07), p=0.016] had a significant effect on the probability of SDNN≤100. In multivariate logistic regression analysis, the presence of coronavirus disease 2019 [(OR 2.42, 95%CI 1.52–3.85), p<0.001] and age [(OR 2.42, 95%CI 1.52–3.85), p=0.016] had a significant effect on the probability of SDNN≤100. Frequency domain measures such as, high-frequency values were significantly higher in the study group (p=0.029). The study group’s low-frequency/high frequency ratio was significantly lower (p=0.019). The low-frequency/high-frequency ratio’s cut-off value was ≤2.77. for determining the differentiation between coronavirus disease 2019 positive and negative cases in the receiver operating characteristic analysis. The sensitivity rate was 80.7%. The area under the curve value is 0.546 (p=0.019). CONCLUSION: This study showed that coronavirus disease 2019 causes reduced heart rate variability and increased parasympathetic activity in young patients. This may explain the prolonged symptoms after coronavirus disease 2019 infection. OBJECTIVE 201 individuals METHODS 24h h 24 clinic 49 4 years pandemic prepandemic pre before 2019. . 2019) noncoronavirus non RESULTS 3 SDNN (SDNN 100 ≤10 27 (2 6.7% 67 6 7 (6.7% 14.8%, 148 14.8% , 14 8 (14.8%) p<0.001. p0001 p p<0.001 0 001 p<0.001) analysis OR 241 2 41 2.41 95CI CI 95 1.52–3.83, 152383 1.52–3.83 1 52 83 1.52–3.83) 104 04 1.04 1.01–1.07, 101107 1.01–1.07 01 07 1.01–1.07) p=0.016 p0016 016 SDNN100 SDNN≤100 242 42 2.42 1.52–3.85, 152385 1.52–3.85 85 1.52–3.85) as highfrequency high p=0.029. p0029 p=0.029 029 (p=0.029) groups s lowfrequency/high lowfrequencyhigh low frequency/high p=0.019. p0019 p=0.019 019 (p=0.019) lowfrequency/highfrequency lowfrequencyhighfrequency ratios cutoff cut off 277 77 ≤2.77 807 80 80.7% 0546 546 0.54 CONCLUSION infection 20 10 ≤1 ( 6.7 (6.7 14.8 (14.8% p000 p<0.00 00 2.4 9 15238 1.52–3.8 5 1.0 10110 1.01–1.0 p=0.01 p001 SDNN10 SDNN≤10 p002 p=0.02 02 (p=0.029 lowfrequency frequencyhigh (p=0.019 ≤2.7 80.7 054 54 0.5 ≤ 6. (6. 14. (14.8 p00 p<0.0 2. 1523 1.52–3. 1. 1011 1.01–1. p=0.0 SDNN1 SDNN≤1 (p=0.02 (p=0.01 ≤2. 80. 05 0. (6 (14. p0 p<0. 152 1.52–3 101 1.01–1 p=0. SDNN≤ (p=0.0 ≤2 (14 p<0 15 1.52– 1.01– p=0 (p=0. (1 p< 1.52 1.01 p= (p=0 1.5 (p= (p