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        "resumen" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Background and aim&#58; Studies on weaning strategies have yielded conflicting results regarding the superiority of different methods&#46; The aim of this RCT was to compare the efficacy of gradual pressure support &#40;PS&#41; reduction without an initial spontaneous breathing trial &#40;SBT&#41; with PS-supported SBT&#46;</p> <span class="elsevierStyleSectionTitle">Methods</span><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Patients mechanically ventilated for &#62;24<span class="elsevierStyleHsp" style=""></span>h were randomized to weaning by gradual reduction of PS without an initial SBT versus once daily SBT &#40;PS 7<span class="elsevierStyleHsp" style=""></span>cm H2O&#41;&#46; The primary outcomes were the rates of successful weaning trial and time to successful extubation&#46; The secondary outcomes were the ICU and hospital length of stay&#44; hospital mortality and the occurrence of ventilator-associated pneumonia &#40;VAP&#41;&#46;</p> <span class="elsevierStyleSectionTitle">Results</span><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">Of the 120 patients &#40;61 males&#44; median age 35 years&#41;&#44; 58 were assigned to PS and 62 to the SBT group&#46; The median &#40;IQR&#41; duration of ventilation prior to weaning was 80&#46;2 &#40;50&#46;5---175&#46;6&#41; h&#46; The baseline characteristics were similar in the two groups except the PaO2&#47;FiO2 ratio&#44; which was significantly higher in SBT group&#46; The rates of successful weaning trial &#40;89&#46;7&#37; versus 69&#46;4&#37;&#41; were significantly higher in the PS group&#46; The median duration of weaning &#40;66<span class="elsevierStyleHsp" style=""></span>h versus 81&#46;5<span class="elsevierStyleHsp" style=""></span>h&#44; P &#61; 0&#46;05&#41; and the median duration of ICU stay &#40;8 days versus 9&#46;4 days&#44; P &#61; 0&#46;027&#41; were lower in the PS group&#46; There was no difference in hospital stay&#44; mortality rates or occur-rence of VAP in the two arms&#46; On multivariate analysis&#44; the duration of ventilation prior to weaning&#44; baseline SOFA score and the weaning method were predictors of successful extubation&#46;</p> <span class="elsevierStyleSectionTitle">Conclusions</span><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Gradual reduction of PS without an initial SBT was found to be associated with better outcomes compared to once daily PS-supported SBT&#46;</p>"
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        "resumen" => "<p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">Antecedentes e objetivo&#58; Os estudos sobre estrat&#233;gias de desmame tiveram resultados contro-versos em rela&#231;&#227;o &#224; superioridade de m&#233;todos diferentes&#46; O objetivo deste RCT foi comparar a efic&#225;cia da redu&#231;&#227;o gradual da press&#227;o de suporte &#40;PS&#41; sem uma prova de respira&#231;&#227;o espont&#226;nea &#40;SBT&#41; inicial com a PS apoiada pela SBT&#46; M&#233;todos&#58; Os pacientes ventilados mecanicamente por &#62;24 horas foram aleatorizados para des-mame por redu&#231;&#227;o gradual da PS sem uma SBT inicial versus a SBT uma vez por dia &#40;PS-7<span class="elsevierStyleHsp" style=""></span>cm H2O&#41;&#46; Os principais resultados foram as taxas de sucesso do teste de desmame e o tempo at&#233; a extuba&#231;&#227;o bem sucedida&#46; Os resultados secund&#225;rios foram o tempo em que estiveram na UCI e no hospital&#44; mortalidade hospitalar e ocorr&#234;ncia de pneumonia associada ao ventilador &#40;VAP&#41;&#46; Resultados&#58; Dos 120 pacientes &#40;61 homens&#44; m&#233;dia de idade de 35 anos&#41;&#44; 58 foram atribu&#237;dos ao grupo de PS e 62 ao grupo de SBT&#46; A dura&#231;&#227;o m&#233;dia &#40;IQR&#41; da ventila&#231;&#227;o antes do desmame foi de 80&#44;2 &#40;50&#44;5---175&#44;6&#41; horas&#46; Os par&#226;metros basais foram semelhantes nos dois grupos&#44; exceto a taxa PaO2&#47;FiO2&#44; que foi significativamente superior no grupo de SBT&#46; As taxas de testes de desmame bem-sucedido &#40;89&#44;7&#37; versus 69&#44;4&#37;&#41; foram significativamente superiores no grupo de PS&#46; A dura&#231;&#227;o m&#233;dia de desmame &#40;66 versus 81&#44;5 horas&#44; p &#61; 0&#46;05&#41; e a dura&#231;&#227;o m&#233;dia de tempo na UCI &#40;8 versus 9&#44;4 dias&#44; p &#61; 0&#44;027&#41; foi inferior no grupo PS&#46; N&#227;o se registaram diferen&#231;as no tempo em que estiveram no hospital&#44; taxas de mortalidade ou ocorr&#234;ncia de VAP nos dois grupos&#46; Numa an&#225;lise multivariada&#44; a dura&#231;&#227;o de ventila&#231;&#227;o antes do desmame&#44; o &#237;ndice SOFA basal e o m&#233;todo de desmame foram preditores de uma extuba&#231;&#227;o bem sucedida&#46; Conclus&#245;es&#58; Descobriu-se que a redu&#231;&#227;o gradual da PS sem uma SBT inicial estava associada com melhores resultados comparados com PS apoiada pela SBT uma vez por dia&#46;</p>"
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Journal Information
Vol. 17. Issue 6.
Pages 244-252 (November - December 2011)
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Vol. 17. Issue 6.
Pages 244-252 (November - December 2011)
Original article
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Weaning by gradual pressure support (PS) reduction without an initial spontaneous breathing trial (SBT) versus PS-supported SBT: A pilot study
Desmame por redução gradual da pressão de suporte (PS) sem uma prova de respiração espontânea (SBT) inicial versus PS apoiada pela SBT: um estudo piloto
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K. Gnanapandithana, R. Agarwalb,
Corresponding author
riteshpgi@gmail.com

Corresponding author.
, A.N. Aggarwalb, D. Guptab
a Dept of Internal Medicine, Postgraduate Institute of Medical Education and Research, Chandigarh, India
b Dept of Pulmonary Medicine, Postgraduate Institute of Medical Education and Research, Chandigarh, India
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Article information
Abstract

Background and aim: Studies on weaning strategies have yielded conflicting results regarding the superiority of different methods. The aim of this RCT was to compare the efficacy of gradual pressure support (PS) reduction without an initial spontaneous breathing trial (SBT) with PS-supported SBT.

Methods

Patients mechanically ventilated for >24h were randomized to weaning by gradual reduction of PS without an initial SBT versus once daily SBT (PS 7cm H2O). The primary outcomes were the rates of successful weaning trial and time to successful extubation. The secondary outcomes were the ICU and hospital length of stay, hospital mortality and the occurrence of ventilator-associated pneumonia (VAP).

Results

Of the 120 patients (61 males, median age 35 years), 58 were assigned to PS and 62 to the SBT group. The median (IQR) duration of ventilation prior to weaning was 80.2 (50.5---175.6) h. The baseline characteristics were similar in the two groups except the PaO2/FiO2 ratio, which was significantly higher in SBT group. The rates of successful weaning trial (89.7% versus 69.4%) were significantly higher in the PS group. The median duration of weaning (66h versus 81.5h, P = 0.05) and the median duration of ICU stay (8 days versus 9.4 days, P = 0.027) were lower in the PS group. There was no difference in hospital stay, mortality rates or occur-rence of VAP in the two arms. On multivariate analysis, the duration of ventilation prior to weaning, baseline SOFA score and the weaning method were predictors of successful extubation.

Conclusions

Gradual reduction of PS without an initial SBT was found to be associated with better outcomes compared to once daily PS-supported SBT.

Keywords:
Mechanical ventilation
Weaning
Extubation
Respiratory failure
ICU
ARDS
Resumo

Antecedentes e objetivo: Os estudos sobre estratégias de desmame tiveram resultados contro-versos em relação à superioridade de métodos diferentes. O objetivo deste RCT foi comparar a eficácia da redução gradual da pressão de suporte (PS) sem uma prova de respiração espontânea (SBT) inicial com a PS apoiada pela SBT. Métodos: Os pacientes ventilados mecanicamente por >24 horas foram aleatorizados para des-mame por redução gradual da PS sem uma SBT inicial versus a SBT uma vez por dia (PS-7cm H2O). Os principais resultados foram as taxas de sucesso do teste de desmame e o tempo até a extubação bem sucedida. Os resultados secundários foram o tempo em que estiveram na UCI e no hospital, mortalidade hospitalar e ocorrência de pneumonia associada ao ventilador (VAP). Resultados: Dos 120 pacientes (61 homens, média de idade de 35 anos), 58 foram atribuídos ao grupo de PS e 62 ao grupo de SBT. A duração média (IQR) da ventilação antes do desmame foi de 80,2 (50,5---175,6) horas. Os parâmetros basais foram semelhantes nos dois grupos, exceto a taxa PaO2/FiO2, que foi significativamente superior no grupo de SBT. As taxas de testes de desmame bem-sucedido (89,7% versus 69,4%) foram significativamente superiores no grupo de PS. A duração média de desmame (66 versus 81,5 horas, p = 0.05) e a duração média de tempo na UCI (8 versus 9,4 dias, p = 0,027) foi inferior no grupo PS. Não se registaram diferenças no tempo em que estiveram no hospital, taxas de mortalidade ou ocorrência de VAP nos dois grupos. Numa análise multivariada, a duração de ventilação antes do desmame, o índice SOFA basal e o método de desmame foram preditores de uma extubação bem sucedida. Conclusões: Descobriu-se que a redução gradual da PS sem uma SBT inicial estava associada com melhores resultados comparados com PS apoiada pela SBT uma vez por dia.

Palavras chave:
Ventilação mecânica
Desmame
Extubação
Falha respiratória
UCI
ARDS
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