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Cumulative life course impairment in patients with dermatological diseases, with a focus on psoriasis diseases
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Romiti, Ricardo

; Magalhães, Renata Ferreira

; Duarte, Gleison Vieira

Anais Brasileiros de Dermatologia

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2024, Volume 99 N. 2 Pages 269 - 276

Abstract: En | Text: En | PDF: En

Abstract The concept of “Cumulative Life Course Impairment” (CLCI) characterizes the set of factors harmful to the lives of patients resulting from the stigma and physical and psychological impairment associated with different chronic diseases, which can accumulate irreversibly over the course of patients lives. The sum of these factors often makes it impossible for these individuals to enjoy their lives fully, intensely and adequately. On the other hand, CLCI also incorporates coping strategies, including external factors and personality characteristics, which may act as modulating or protective factors of vulnerability to the CLCI. Although psoriasis is the most studied dermatological disease in relation to its impact on quality of life and CLCI, several other chronic inflammatory diseases such as atopic dermatitis, hidradenitis suppurativa, and alopecia areata have also been evaluated in relation to the magnitude of the damage to patients lives. Cumulative Impairment (CLCI fully adequately hand strategies characteristics dermatitis suppurativa

https://doi.org/10.1016/j.abd.2023.08.006

Manually prepared lamellae for Descemet stripping endothelial keratoplasty (Pachy-DSEK): comparison of four dissection depths PachyDSEK Pachy DSEK (Pachy-DSEK) (Pachy-DSEK
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Bertino, Pedro

; Magalhães, Renata Soares

; Souza Junior, Carlos Jose de

; Maranhão, Lucio de Vieira Leite

; Prazeres, Tatiana Moura Bastos

Arquivos Brasileiros de Oftalmologia

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2024, Volume 87 N. 3 elocation e2022-0076

Abstract: En Pt | Text: En Pt | PDF: En | PDF: Pt

ABSTRACT Purpose: This study aimed to compare four depths of manual dissection for the preparation of Descemet stripping endothelial keratoplasty lamellae. Methods: Eye bank corneas were randomized into four groups according to dissection depths: Pachy-100 (incision depth = central corneal thickness-safety margin of 100 µm), Pachy-50 (safety margin of 50 µm), Pachy-0 (no safety margin), and Pachy+50 (incision depth = central corneal thickness + 50 µm). All endothelial lamellae were prepared using a standardized method of manual dissection (Pachy-DSEK). The central, paracentral (3.0-mm zone), and peripheral (6.0-mm zone) lamella thicknesses and incision depths were measured by optical coherence tomography. The 3.0-mm and 6.0-mm zone central-to-peripheral thickness ratios were calculated. Results: Endothelial perforation occurred only in the Pachy+50 group (n=3, 30%). Central lamella’s thickness in Pachy-100, Pachy-50, Pachy-0, and Pachy+50 groups measured 185 ± 42 µm, 122 ± 29 µm, 114 ± 29 µm, and 58 ± 31 µm, respectively (p<0.001). The overall 3.0- and 6.0-mm C/P ratios were 0.97 ± 0.06 and 0.92 ± 0.14, respectively. Preoperative donor characteristics were not correlated with most thickness outcomes. The planned incision depth correlated significantly with most lamella’s thickness parameters (p<0.001). The overall thickness of the lamella negatively correlated with the planned incision depth (p<0.001, r=-0.580). The best outcome was found in the Pachy-0 group, as 75% of the lamellae measured <130 µm and there was no endothelial perforation. Conclusions: By using a standardized method of dissection, most manually prepared lamellae presented a planar shape. Setting the incision depth to the central corneal thickness did not result in endothelial perforation and a high percentage of ultrathin lamellae was achieved. Purpose Methods Pachy100 Pachy Pachy-10 thicknesssafety 10 , µm) Pachy50 Pachy-5 5 Pachy0 0 Pachy- margin, margin) Pachy+5 µm. . PachyDSEK. PachyDSEK DSEK (Pachy-DSEK) 3.0mm 30mm mm 3.0 3 zone, 6.0mm 60mm 6.0 6 tomography centraltoperipheral calculated Results n=3, n3 n (n=3 30%. 30 30% 30%) lamellas s Pachy100, 100, Pachy50, 50, Pachy0, 0, 18 4 12 2 11 p<0.001. p0001 p p<0.001 001 (p<0.001) CP C P 097 97 0.9 006 06 0.0 092 92 014 14 0.14 outcomes p<0.001, (p<0.001 r=0.580. r0580 r r= 0.580 580 r=-0.580) 75 130 <13 Conclusions shape achieved Pachy10 Pachy-1 1 Pachy5 Pachy+ (Pachy-DSEK 0mm 3. 60 6. n=3 (n= p000 p<0.00 00 09 9 0. 01 0.1 (p<0.00 r=0.580 r058 0580 0.58 r=-0.580 7 13 <1 Pachy1 n= (n p00 p<0.0 (p<0.0 r=0.58 r05 058 0.5 r=-0.58 < p0 p<0. (p<0. r=0.5 r0 05 r=-0.5 p<0 (p<0 r=0. r=-0. p< (p< r=0 r=-0 (p r=-

RESUMO Objetivo: Comparar quatro profundidades de dissecção manual usadas no preparo de lamelas para transplante endotelial. Métodos: Córneas humanas de treinamento disponibilizadas foram randomizadas em quatro grupos: Pachy-100 (profundidade de incisão = espessura corneana central - margem de segurança de 100 µm), Pachy-50 (margem de segurança de 50 µm), Pachy-0 (sem margem de segurança) e Pachy+50 (profundidade de incisão = espessura corneana central + 50 µm). Todas as lamelas foram dissecadas através um método padronizado e já publicado (Pachy-DSEK). As espessuras das lamelas (centro, zona de 3,0mm e zona de 6,0mm) foram medidas com tomografia de coerência óptica. A razão de espessura centro-periferia foi calculada aos 3,0 e 6,0 mm de diâmetro. Resultados: Perfuração endotelial ocorreu apenas no grupo Pachy+50 (n=3, 30%). A espessura central da lamela nos grupos Pachy-100, Pachy-50, Pachy-0 e Pachy+50 foi de 185 ± 42 µm, 122 ± 29 µm, 114 ± 29 µm, e 58 ± 31 µm, respectivamente (p<0,001). As razões C/P aos 3,0 e 6,0 mm foram de 0,97 ± 0,06 e 0,92 ± 0,14, respectivamente. Os parâmetros de características do doador não se correlacionaram com os resultados de espessura de lamela. A profundidade planejada de incisão se correlacionou com a maioria dos parâmetros de espessura de lamela (p<0,001). A espessura de lamela se correlacionou negativamente com a profundidade planejada da incisão (p<0.001, r=-0,580). O melhor resultado foi observado no grupo Pachy-0, em que 75% das lamelas mediram abaixo de 130 µm e não houve perfuração endotelial. Conclusão: Através de um método padronizado de dissecção, a maioria das lamelas endoteliais apresentou uma configuração planar. O planejamento de profundidade de incisão igual à espessura corneana central resultou em alta porcentagem de lamelas ultrafinas sem ocorrência de perfuração. Objetivo Métodos Pachy100 Pachy Pachy-10 10 , µm) Pachy50 Pachy-5 5 Pachy0 0 Pachy- Pachy+5 µm. . PachyDSEK. PachyDSEK DSEK (Pachy-DSEK) centro, centro (centro 30mm 3 0mm 6,0mm 60mm 6 óptica centroperiferia periferia 30 3, 60 6, diâmetro Resultados n=3, n3 n (n=3 30%. 30% 30%) Pachy100, 100, Pachy50, 50, 18 4 12 2 11 p<0,001. p0001 p p<0,001 001 (p<0,001) CP C P 097 97 0,9 006 06 0,0 092 92 014 14 0,14 p<0.001, (p<0.001 r=0,580. r0580 r r= 0,580 580 r=-0,580) Pachy0, 0, 75 13 Conclusão planar Pachy10 Pachy-1 1 Pachy5 Pachy+ (Pachy-DSEK n=3 (n= p000 p<0,00 00 (p<0,001 09 9 01 0,1 p<0.001 (p<0.00 r=0,580 r058 0580 0,58 r=-0,580 7 Pachy1 n= (n p00 p<0,0 (p<0,00 p<0.00 (p<0.0 r=0,58 r05 058 0,5 r=-0,58 p0 p<0, (p<0,0 p<0.0 (p<0. r=0,5 r0 05 r=-0,5 p<0 (p<0, p<0. (p<0 r=0, r=-0, p< (p< r=0 r=-0 (p r=-

https://doi.org/10.5935/0004-2749.2022-0076

Field cancerization in dermatology
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Magalhães, Renata Ferreira

; Buffo, Thais Helena

; Gonçalves, Heitor de Sá

; Barcaui, Carlos Baptista

; Moraes, Aparecida Machado de

Revista da Associação Médica Brasileira

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2024, Volume 70 Suppl. 1 elocation e2024S113

Abstract: En | Text: En | PDF: En

https://doi.org/10.1590/1806-9282.2024s113

Misleading subcutaneous mycosis: a case report of subsequent clinical mycetoma-like and histological chromoblastomycosis-like lesions mycosis mycetomalike mycetoma like chromoblastomycosislike chromoblastomycosis
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Brufatto, João Paulo Turri

; Pontes, Laís

; Schreiber, Angélica Zaninelli

; Cintra, Maria Leticia

; Souza, Cintia Avila

; Gomide, Luciana Vilela

; Guerra, Helena Maciel Mendonça Tolentino

; Stelini, Rafael Fantelli

; Brum, Isabela Vilela

; França, Andrea Fernandes Eloy da Costa

; Magalhães, Renata Ferreira

; Velho, Paulo Eduardo Neves Ferreira

Revista do Instituto de Medicina Tropical de São Paulo

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2024, Volume 66 elocation e34

Abstract: En | Text: En | PDF: En

ABSTRACT Hyalohyphomycosis and phaeohyphomycosis are groups of mycoses caused by several agents and show different clinical manifestations. We report a case of an immunocompromised patient who presented rare manifestations of opportunistic mycoses: mycetoma-like hyalohyphomycosis on his right foot caused by Colletotrichum gloeosporioides, followed by cutaneous phaeohyphomycosis on his right forearm caused by Exophiala oligosperma. Further to the rarity of this case, the patient's lesion on the foot shows that the clinical aspects of mycetomas could falsely appear in other fungal infections similar to hyalohyphomycosis. We also show that the muriform cells that were seen in the direct and anatomopathological examination of the skin are not pathognomonic of chromoblastomycosis, as observed in the lesion of the patient's forearm. mycetomalike mycetoma like gloeosporioides oligosperma patients s chromoblastomycosis

https://doi.org/10.1590/s1678-9946202466034

Mohs micrographic surgery in rare cutaneous tumors: a retrospective study at a Brazilian tertiary university hospital tumors
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Buffo, Thais Helena

; Stelini, Rafael Fantelli

; Serrano, Juliana Yumi Massuda

; Pontes, Luciana Takata

; Magalhães, Renata Ferreira

; de Moraes, Aparecida Machado

Anais Brasileiros de Dermatologia

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feb 2023, Volume 98 N. 1 Pages 36 - 46

Abstract: En | Text: En | PDF: En

Abstract Background Mohs micrographic surgery is an established technique in the treatment of cutaneous neoplasms. It offers higher cure rates and the main indications are non-melanoma malignant skin tumors. Few studies have been performed on the treatment of rare tumors through this technique. Objective To study rare skin tumors and rare variants of basal cell carcinoma and squamous cell carcinoma submitted to Mohs micrographic surgery in a tertiary service in relation to frequency, disease-free evolution, and applicability of this surgical procedure for this group of tumors. Methods This was a retrospective observational study including rare skin tumors and less common variants of basal cell carcinoma and squamous cell carcinoma treated using Mohs micrographic surgery, between October 2008 and April 2021. Results During the study period, 437 tumors were treated using Mohs micrographic surgery, and 22 (5%) rare skin tumors were selected. The tumors comprised three dermatofibrosarcomas protuberans, two atypical fibroxanthomas, two spiradenomas, two hypercellular fibrohistiocytomas, one primary cutaneous adenocarcinoma, one trichoblastoma, one porocarcinoma, one chondroid syringoma, one cutaneous angiosarcoma, one Merkel cell carcinoma, and one sebaceous carcinoma. Six other cases of rare basal cell carcinoma variants with trichoepitheliomatous differentiation, metatypical basal cell carcinoma, and clear cell squamous cell carcinoma were included. There were no cases of recurrence after an average of six years of follow-up. Study limitations This is a retrospective study on rare neoplasms carried out in a single referral center, and this surgical technique isn’t widely available in the public service. Conclusion This retrospective case series showed that Mohs micrographic surgery is an appropriate treatment for rare skin tumors. They corresponded to 5% of the tumors treated by the technique during a 12-year-period, with no recurrences identified. nonmelanoma non melanoma frequency diseasefree disease free evolution 200 2021 period 43 2 5 (5% selected protuberans fibroxanthomas spiradenomas fibrohistiocytomas adenocarcinoma trichoblastoma porocarcinoma syringoma angiosarcoma differentiation included followup. followup follow up. up follow-up center isnt isn t 12yearperiod, 12yearperiod yearperiod 12 year 12-year-period identified 20 202 4 (5 1 (

https://doi.org/10.1016/j.abd.2022.01.009

Reuse of Spent Foundry Sand in Development of Glass-Ceramic Material with Wollastonite Phase GlassCeramic Glass Ceramic
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Magalhães, Renata da Silva

; Santos, Luis Fernando dos

; Santos, Gleyson Tadeu de Almeida

; Pereira, Luiz Augusto Stuani

; Fernandes, José Diego

; Albas, Agda Eunice de Souza

; Teixeira, Silvio Rainho

Materials Research

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2023, Volume 26 Suppl. 1 elocation e20220533

Abstract: En | Text: En | PDF: En

Spent Foundry Sand is one of the largest industrial solid wastes generated by foundries in the production of iron and steel components. Currently, millions of tons of molten sands are discarded worldwide. Therefore, this work aims to reuse the Spent Foundry Sand for the production of glass-ceramic materials, since this reuse minimizes the environmental impacts related to its discarding. The Spent Foundry Sand, composed of >60% SiO2, was mixed with limestone and melted at 1500 °C to produce the glass (melting and rapid cooling method). The materials were characterized by X-Ray Fluorescence, X-Ray Diffraction and thermal analysis. The X-Ray Diffraction results of the glass tablets treated at 875, 941 and 1050 °C show that the formed phases are Wollastonite-1A, β-Wollastonite and Akermanite. In summary, it is possible to produce glass-ceramic from Spent Foundry Sand with Wollastonite phase. components Currently worldwide Therefore glassceramic ceramic discarding 60 >60 SiO2 SiO 150 C melting method. method . method) XRay X Ray Fluorescence analysis 875 94 105 Wollastonite1A, Wollastonite1A WollastoniteA 1A, 1A A Wollastonite-1A βWollastonite β Akermanite summary phase 6 >6 15 87 9 10 > 1 8

https://doi.org/10.1590/1980-5373-mr-2022-0533

Generalized pustular psoriasis (von Zumbusch)
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Romiti, Ricardo

; Hirayama, André Luís da Silva

; Arnone, Marcelo

; Magalhães, Renata Ferreira

Anais Brasileiros de Dermatologia

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feb 2022, Volume 97 N. 1 Pages 63 - 74

Abstract: En | Text: En | PDF: En

Abstract Generalized pustular psoriasis (von Zumbusch) is a rare and acute eruption characterized by multiple sterile pustules over an erythematous and edematous background, eventually associated with psoriasis vulgaris. Classically, it manifests as a potentially severe systemic picture and demands prompt diagnosis and intervention. The duration of each flare-up and intervals between the pustular episodes is extremely variable. Recently, genetic abnormalities have been identified mainly in the familial and early variants of this disease. The therapeutic arsenal is limited; however, new drugs being evaluated aim to control both pustular flare-ups and disease recurrences.

https://doi.org/10.1016/j.abd.2021.05.011

Manually prepared lamellae for Descemet stripping endothelial keratoplasty (Pachy-DSEK): comparison of four dissection depths
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Bertino, Pedro

; Magalhães, Renata Soares

; Souza Junior, Carlos Jose de

; Maranhão, Lucio de Vieira Leite

; Prazeres, Tatiana Moura Bastos

Arquivos Brasileiros de Oftalmologia

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2022, N. ahead

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

https://doi.org/10.5935/0004-2749.2022-0076

Immunobiologicals in dermatology
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Silva, Dimitri Luz Felipe da

; Secamilli, Elisa Nunes

; Beleli, Mariana Valbon

; Massuda, Juliana Yumi

; Franca, Andrea F.E.C.

; Magalhães, Renata F.

Anais Brasileiros de Dermatologia

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2022, Volume 97 N. 3 Pages 275 - 283

Abstract: En | Text: En | PDF: En

Abstract Immunobiologicals are a reality in current clinical practice and have increasingly gained space in the inflammatory disease scenario, especially in dermatology, with approved drugs for psoriasis, atopic dermatitis, and hidradenitis suppurativa, in addition to many others undergoing study. It is important for dermatologists to have knowledge of the medications approved in Brazil, for the best management of dermatoses, in addition to the fact that they represent hope for improvement in patients with chronic diseases.

https://doi.org/10.1016/j.abd.2021.05.016

10.

Teledermatology before and after coronavirus,
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Silva, Dimitri Luz Felipe

; Gameiro, Luiz

; Massuda, Juliana Yumi

; Magalhães, Renata Ferreira

; da Costa França, Andrea Fernandes Eloy

Anais Brasileiros de Dermatologia

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mar 2021, Volume 96 N. 2 Pages 248 - 250

Abstract: En | Text: En | PDF: En

https://doi.org/10.1016/j.abd.2020.09.003 96 downloads

11.

Prevalence of infection by Bartonella spp. in patients with psoriasis,
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Santos, Luciene Silva dos

; Drummond, Marina Rovani

; Magalhães, Renata Ferreira

; Silva, Marilene Neves da

; Ferreira, Patricia Andreia Rodrigues

; Ferreira Velho, Paulo Eduardo Neves

Anais Brasileiros de Dermatologia

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feb 2021, Volume 96 N. 1 Pages 107 - 110

Abstract: En | Text: En | PDF: En

https://doi.org/10.1016/j.abd.2020.07.004 224 downloads

12.

Basal cell carcinoma with compromised margins: retrospective study of management, evolution, and prognosis,
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Fidelis, Maria Carolina

; Stelini, Rafael Fantelli

; Staffa, Leonardo Piropo

; Moraes, Aparecida Machado de

; Magalhães, Renata Ferreira

Anais Brasileiros de Dermatologia

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feb 2021, Volume 96 N. 1 Pages 17 - 26

Abstract: En | Text: En | PDF: En

Abstract Background: Non-melanoma skin cancer is the most common type of malignancy in the Western world, and surgical excision is the preferred approach. The approach adopted in the face of incomplete excisions of basal cell carcinoma is still controversial. Objectives: To compare the number of tumor recurrences after treatment for incompletely excised basal cell carcinoma. Methods: Selection and statistical analysis of medical records of patients who had compromised margins after excision of basal cell carcinoma in a tertiary hospital from 2008 to 2013. Results: A total of 120 medical records were analyzed; the mean age was 69.6 years, and 50% of the patients were female. The most prevalent histological type was nodular; the mean size was 1.1 cm, and the tumor location with the highest incidence was the nose. The lateral margin was the most frequently positive. Clinical follow-up was more widely adopted; only 40 patients underwent a second surgery. The total number of patients who had tumor recurrence was 34 (28.3%). Only the malar location significantly influenced the incidence of recurrence (p = 0.02). The mean follow-up time was 29.54 months, with no significant difference between the follow-ups, although 32.9% of the patients followed-up clinically showed recurrence, against only 20% of those who underwent a second surgery. Study limitations: Mean follow-up time of less than five years and sample size. Conclusions: The presence of compromised margins does not necessarily imply recurrence. Location, tumor size, histological subtype, previous epithelial tumors, and clinical conditions of the patient must be considered when choosing the best treatment option.

https://doi.org/10.1016/j.abd.2020.11.001 276 downloads

13.

Consensus on the treatment of hidradenitis suppurativa - Brazilian Society of Dermatology
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Magalhães, Renata Ferreira

; Rivitti-Machado, Maria Cecília

; Duarte, Gleison Vieira

; Souto, Roberto

; Nunes, Daniel Holthausen

; Chaves, Mario

; Hirata, Sérgio Henrique

; Ramos, Andrea Machado Coelho

Anais Brasileiros de Dermatologia

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apr 2019, Volume 94 N. 2 Pages 7 - 19

Abstract: En | Text: En | PDF: En

Abstract: Hidradenitis suppurativa is a chronic immune mediated disease of universal distribution that causes great damage to the quality of life of the affected individual, whose prevalence is estimated at 0.41% in the Brazilian population. The objective of this work was update on physiopathogenesis, diagnosis and classification of hidradenitis suppurativa and to establish therapeutic recommendations in the Brazilian reality. It was organized as a work group composed of eight dermatologists from several institutions of the country with experience in the treatment of hidradenitis suppurativa and carried out review on the topic. Recommendations were elaborated and voted by modified Delphi system and statistical analysis of the results was performed. The Brazilian consensus on the clinical approach of hidradenitis suppurativa had the support of the Brazilian Society of Dermatology.

https://doi.org/10.1590/abd1806-4841.20198607 6229 downloads

14.

Brazilian recommendations on the safety and effectiveness of the yellow fever vaccination in patients with chronic immune-mediated inflammatory diseases
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Pileggi, Gecilmara Salviato

; Mota, Licia Maria Henrique Da

; Kakehasi, Adriana Maria

; Souza, Alexandre Wagner De

; Rocha, Aline

; Melo, Ana Karla Guedes de

; Fonte, Caroline Araujo M. da

; Bortoletto, Cecilia

; Brenol, Claiton Viegas

; Marques, Claudia Diniz Lopes

; Zaltman, Cyrla

; Borba, Eduardo Ferreira

; Reis, Enio Ribeiro

; Freire, Eutilia Andrade Medeiros

; Klumb, Evandro Mendes

; Christopoulos, Georges Basile

; Laurindo, Ieda Maria M.

; Ballalai, Isabella

; Costa, Izaias Pereira Da

; Michelin, Lessandra

; Valadares, Lilian David de Azevêdo

; Chebli, Liliana Andrade

; Lacerda, Marcus

; Toscano, Maria Amazile Ferreira

; Yazbek, Michel Alexandre

; Vieira, Rejane Maria R. De Abreu

; Magalhães, Renata

; Kfouri, Renato

; Richtmann, Rosana

; Merenlender, Selma Da Costa Silva

; Valim, Valeria

; Assis, Marcos Renato De

; Kowalski, Sergio Candido

; Trevisani, Virginia Fernandes Moça

Advances in Rheumatology

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2019, Volume 59 elocation 17

Abstract: En | Text: En | PDF: En

Abstract Background: In Brazil, we are facing an alarming epidemic scenario of Yellow fever (YF), which is reaching the most populous areas of the country in unvaccinated people. Vaccination is the only effective tool to prevent YF. In special situations, such as patients with chronic immune-mediated inflammatory diseases (CIMID), undergoing immunosuppressive therapy, as a higher risk of severe adverse events may occur, assessment of the risk-benefit ratio of the yellow fever vaccine (YFV) should be performed on an individual level. Main body of the abstract: Faced with the scarcity of specific orientation on YFV for this special group of patients, the Brazilian Rheumatology Society (BRS) endorsed a project aiming the development of individualized YFV recommendations for patients with CIMID, guided by questions addressed by both medical professionals and patients, followed an internationally validated methodology (GIN-McMaster Guideline Development). Firstly, a systematic review was carried out and an expert panel formed to take part of the decision process, comprising BRS clinical practitioners, as well as individuals from the Brazilian Dermatology Society (BDS), Brazilian Inflammatory Bowel Diseases Study Group (GEDIIB), and specialists on infectious diseases and vaccination (from Tropical Medicine, Infectious Diseases and Immunizations National Societies); in addition, two representatives of patient groups were included as members of the panel. When the quality of the evidence was low or there was a lack of evidence to determine the recommendations, the decisions were based on the expert opinion panel and a Delphi approach was performed. A recommendation was accepted upon achieving ≥80% agreement among the panel, including the patient representatives. As a result, eight recommendations were developed regarding the safety of YFV in patients with CIMID, considering the immunosuppression degree conferred by the treatment used. It was not possible to establish recommendations on the effectiveness of YFV in these patients as there is no consistent evidence to support these recommendations. Conclusion: This paper approaches a real need, assessed by clinicians and patient care groups, to address specific questions on the management of YFV in patients with CIMID living or traveling to YF endemic areas, involving specialists from many areas together with patients, and might have global applicability, contributing to and supporting vaccination practices. We recommended a shared decision-making approach on taking or not the YFV.

https://doi.org/10.1186/s42358-019-0056-x 1111 downloads

15.

Síntese de BaTIO3 e SrTIO3 pelo método hidrotermal assistido por micro-ondas utilizando anatase como precursor de titânio
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Magalhães, Renata S.

; Junior, Wagner D. M.

; Souza, Agda E.

; Teixeira, Silvio R.

; Li, Máximo S.

; Longo, Elson

Química Nova

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feb 2017, Volume 40 N. 2 Pages 166 - 170

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

In this work barium titanate (BT) and strontium titanate (ST) were prepared by Microwave-Assisted Hydrothermal (MAH) method, using a Ti precursor different from those shown in the literature and various concentrations (1, 3 e 6 mol L-1) of KOH mineralizer. As a titanium precursor, an anatase complex with hydrogen peroxide were used. For the precursors of barium and strontium, chlorides were used. The materials resulting from the synthesis processes were characterized in room temperature by different techniques as like: X-Ray Diffraction (XRD), micro-Raman Spectroscopy, UV-Vis, Scanning Electron Microscopy (SEM) and Photoluminescence (PL). The results show that there were differences in crystallinity, morphology, number of phases and photoluminescence depending on the concentration of the mineralizer.

https://doi.org/10.21577/0100-4042.20160181 1716 downloads

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