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A randomized clinical trial of neurally adjusted ventilatory assist versus conventional weaning mode in patients with COPD and prolonged mechanical ventilation

Authors Kuo N, Tu M, Hung T, Liu S, Chung Y, Lin M, Wu C

Received 27 December 2015

Accepted for publication 19 February 2016

Published 11 May 2016 Volume 2016:11(1) Pages 945—951


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Richard Russell

Nai-Ying Kuo,1,2 Mei-Lien Tu,1,3 Tsai-Yi Hung,1 Shih-Feng Liu,4 Yu-Hsiu Chung,4 Meng-Chih Lin,4 Chao-Chien Wu4

1Department of Respiratory Therapy, Kaohsiung Chang Gung Memorial Hospital; 2Kaohsiung Medical University; 3Respiratory Care, Chang Gung University of Science and Technology, Chiayi, Taiwan; 4Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan

Background: Patient-ventilator asynchrony is a common problem in mechanically ventilated patients; the problem is especially obvious in COPD. Neutrally adjusted ventilatory assist (NAVA) can improve patient-ventilator asynchrony; however, the effect in COPD patients with prolonged mechanical ventilation is still unknown. The goals of this study are to evaluate the effect of NAVA and conventional weaning mode in patients with COPD during prolonged mechanical ventilation.
Methods: The study enrolled a total of 33 COPD patients with ventilator dependency for more than 21 days in the weaning center. A diaphragm electrical activity (Edi) catheter was inserted in patients within 24 hours after admission to the respiratory care center, and patients were randomly allocated to NAVA or conventional group. A spontaneous breathing trial was performed every 24 hours. The results correlated with the clinical parameters.
Results: There were significantly higher asynchrony incidence rates in the whole group after using Edi catheter (before vs post-Edi catheter insertion =60.6% vs 87.9%, P<0.001). Asynchrony index: before vs post-Edi catheter insertion =7.4%±8.5% vs 13.2%±13.5%, P<0.01. Asynchrony incidence: NAVA vs conventional =0% vs 84.2%, P<0.001. Asynchrony index: NAVA vs conventional =0 vs 11.9±11.2 (breath %), P<0.001. The most common asynchrony events were ineffective trigger and delayed trigger.
Conclusion: Compared to conventional mode, NAVA mode can significantly enhance respiratory monitoring and improve patient-ventilator interaction in COPD patients with prolonged mechanical ventilation in respiratory care center.

Keywords: Edi catheter, NAVA (neurally adjusted ventilatory assist), prolonged mechanical ventilation, asynchrony index, COPD, pneumatic trigger

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