Abstract The increase in world population and the demand for technologies have exponentially increased the consumption of mineral resources, putting their availability for future generations at risk. The objective of this study is to know the state of academic production on resource scarcity and evaluate its consequences on exploitation, sustainability and technological development. A systematized bibliographic review was developed using the Scopus, WoS and SciELO databases. 57 documents were analyzed that cover topics such as the environmental impact of extraction, reuse strategies, criticality evaluations and regulatory policies for mining activity. It is concluded that the main factors of resource scarcity are related to the lack of regulations, the growing demand for new technologies and discrepancy in criticality estimation methods. There is a need to look for extraction alternatives and promote material recovery strategies.

Resumen El incremento de la población mundial y la demanda de tecnologías han aumentado de manera exponencial el consumo de recursos minerales, poniendo en riesgo su disponibilidad para las generaciones futuras. El presente estudio tiene como objetivo conocer el estado de la producción académica sobre la escasez de recursos y evaluar sus consecuencias en la explotación, la sostenibilidad y el desarrollo tecnológico. Se llevó a cabo una revisión bibliográfica sistematizada usando las bases de datos Scopus, WoS y SciELO. Se analizaron 57 documentos que abordan temáticas como el impacto ambiental de la extracción, estrategias de reutilización, evaluaciones de criticidad y políticas de regulación de la actividad minera. Se concluye que los principales factores de la escasez de recursos están relacionados con la falta de normativa, la creciente demanda de nuevas tecnologías y discrepancia en los métodos de estimación de criticidad. Se advierte la necesidad de buscar alternativas de extracción y fomentar estrategias de recuperación de materiales.

RESUMO Objetivo: Investigar a aplicabilidade do Índice de Oxigenação Respiratória para identificar o risco de falha de cânula nasal de alto fluxo em pacientes com pneumonia. Métodos: Este estudo retrospectivo observacional de 2 anos foi realizado em um hospital de referência em Bogotá, na Colômbia. Incluíram-se no estudo todos os pacientes em que foi utilizada cânula nasal de alto fluxo pós-extubação como terapia-ponte para a extubação. O Índice de Oxigenação Respiratória foi calculado para avaliar o risco de falha pós-extubação de cânula nasal de alto fluxo. Resultados: Incluíram-se no estudo 162 pacientes. Destes, 23,5% apresentaram falha de cânula nasal de alto fluxo. O Índice de Oxigenação Respiratória foi significativamente menor em pacientes que tiveram falha de cânula nasal de alto fluxo. A mediana (IQ 25 - 75%) foi de 10,0 (7,7 - 14,4) versus 12,6 (10,1 - 15,6), com p = 0,006. O Índice de Oxigenação Respiratória > 4,88 apresentou razão de chances bruta de 0,23 (IC95% 0,17 - 0,30) e RC ajustada de 0,89 (IC95% 0,81 - 0,98) estratificada por gravidade e comorbidade. Após a análise de regressão logística, o Índice de Oxigenação Respiratória apresentou razão de chances ajustada de 0,90 (IC95% 0,82 - 0,98; p = 0,026). A área sob a curva Receiver Operating Characteristic para falha de extubação foi de 0,64 (IC95% 0,53 - 0,75; p = 0,06). O Índice de Oxigenação Respiratória não apresentou diferenças entre pacientes que sobreviveram e que morreram durante internação na unidade de terapia intensiva. Conclusão: O Índice de Oxigenação Respiratória é uma ferramenta acessível para identificar pacientes em risco de falha no tratamento pós-extubação com cânulas nasais de alto fluxo. Estudos prospectivos são necessários para ampliar a utilidade nesse cenário.

ABSTRACT Objective: To investigate the applicability of the Respiratory Rate-Oxygenation Index to identify the risk of high-flow nasal cannula failure in post-extubation pneumonia patients. Methods: This was a 2-year retrospective observational study conducted in a reference hospital in Bogotá, Colombia. All patients in whom post-extubation high-flow nasal cannula therapy was used as a bridge to extubation were included in the study. The Respiratory Rate-Oxygenation Index was calculated to assess the risk of post-extubation high-flow nasal cannula failure. Results: A total of 162 patients were included in the study. Of these, 23.5% developed high-flow nasal cannula failure. The Respiratory Rate-Oxygenation Index was significantly lower in patients who had high-flow nasal cannula failure [median (IQR): 10.0 (7.7 - 14.4) versus 12.6 (10.1 - 15.6); p = 0.006]. Respiratory Rate-Oxygenation Index > 4.88 showed a crude OR of 0.23 (95%CI 0.17 - 0.30) and an adjusted OR of 0.89 (95%CI 0.81 - 0.98) stratified by severity and comorbidity. After logistic regression analysis, the Respiratory Rate-Oxygenation Index had an adjusted OR of 0.90 (95%CI 0.82 - 0.98; p = 0.026). The area under the Receiver Operating Characteristic curve for extubation failure was 0.64 (95%CI 0.53 - 0.75; p = 0.06). The Respiratory Rate-Oxygenation Index did not show differences between patients who survived and those who died during the intensive care unit stay. Conclusion: The Respiratory Rate-Oxygenation Index is an accessible tool to identify patients at risk of failing high-flow nasal cannula post-extubation treatment. Prospective studies are needed to broaden the utility in this scenario.

Resumen Introducción: Los microorganismos capaces de producir carbapenemasas vienen incrementándose a nivel mundial y se han convertido en un problema de salud pública global. En Colombia actualmente la resistencia a carbapenémicos en las unidades de cuidado intensivo está aumentando y se desconoce su impacto en desenlaces clínicos. Objetivos: Determinar las características demográficas, clínicas, y los desenlaces de los pacientes adultos en estado crítico con infección por microorganismos productores de carbapenemasas en una unidad de cuidado intensivo polivalente de una institución de alta complejidad. Métodos: Estudio observacional, descriptivo y retrospectivo, incluyendo pacientes con infección por bacterias resistentes a carbapenémicos, ingresados a la unidad de cuidado intensivo entre el 1 de Enero de 2014 y el 1 de Enero de 2018. Se excluyeron los pacientes colonizados. Se evaluaron complicaciones clínicas, estancia en UCI y hospitalaria, así como la mortalidad en UCI y hospitalaria. Resultados: Se incluyó 58 pacientes. La mortalidad global fue de 67,2%, de los cuales 55,17% murió durante su estancia en la unidad de cuidado intensivo y 12.06% en hospitalización. La mediana de estancia en la unidad de cuidado intensivo fue de 18 días (RIQ 4-28). La causa más frecuente de mortalidad fue choque séptico en 51% y las complicaciones más comunes fueron lesión renal aguda y delirium en un 55,2% y 43,1%, respectivamente. La mediana de estancia en la UCI fue de 18 días (RIQ 4-28). Conclusiones: Las infecciones por bacterias resistentes a carbapenémicos en pacientes críticamente enfermos se relacionan con altas tasas de mortalidad, complicaciones y estancia prolongada en UCI

Abstract Introduction: Microorganisms able to produce carbapenemases are spreading worldwide and have become a concerning global public-health problem. In Colombia, the Gram-negative resistance to carbapenems at intensive care units is currently increasing and its impact on clinical outcomes is not well known. Objectives: To determine the demographic, clinical characteristics and outcomes of critically ill adult patients with infection by carbapenemase producing bacteria in a polyvalent intensive care unit of a highly complex institution. Methods: Single-center retrospective, descriptive observational study including critically ill adult patients infected by carbapenemase-producing bacteria and transferred to a polyvalent intensive care unit from January 1th 2014 to January 1th 2018. Known colonized patients were excluded. Clinical complications, ICU and in-hospital days of stay were evaluated, as ICU and in-hospital mortality. Results: A total of 58 patients were included. Overall mortality was 67.2%, of which 55.17% died during their stay in the intensive care unit and 12.06% in hospitalization. The median stay in the intensive care unit was 18 days (IQR 4-28). The most frequent cause of death was septic shock in 51% and the most common complications were acute renal injury and delirium in 55.2% and 43.1%, respectively. The median stay in the ICU was 18 days (RIQ 4-28). Conclusions: Infections caused by carbapenem-resistant bacteria in critically ill patients are associated with high mortality rates, complications and long stay in ICU.