Noninvasive Mechanical Ventilation Improves Endurance Performance in Patients With Chronic Respiratory Failure Due to Thoracic Restriction

Bernd Schonhofer, Sven Wallstein, Conny Wiese, Dieter Kohler
2001 Chest  
Objective: Treatment with noninvasive mechanical ventilation (NMV) alleviates hypoventilation and improves gas exchange in patients with chronic respiratory failure (CRF) due to thoracic restriction. However, little is known about the effects of NMV on respiratory and peripheral muscle endurance. Design: Prospective case-control study. Subjects: Ten patients in clinically stable condition (age, 53.5 ؎ 8.2 years [mean ؎ SD]) with mild-to-moderate CRF due to thoracic restriction (PCO 2 between 45
more » ... mm Hg and 55 mm Hg) were treated with NMV during the night for 3 months. Ten matched patients (age, 52.2 ؎ 9.5 years) receiving 3 months of normal care without NMV served as a control group. Intervention and measurements: After a 3-day period of familiarization with the endurance tests, all patients performed a baseline preintervention inspiratory threshold loading test, cycle ergometer test, and shuttle walking test on the same day. The endurance tests were then repeated following the 3-month intervention period. Results: NMV was used on average for 7.1 ؎ 0.9 h/d during the 3-month period. There was a significant improvement in endurance time (p < 0.0001) in all three endurance tests in the NMV group compared with the control group. In the NMV group, endurance time increased by 278 ؎ 269% during the inspiratory threshold loading test, by 176 ؎ 159% during the cycle ergometer test, and by 32 ؎ 22% during the shuttle walking test. Significant improvements (p < 0.01) in both PO 2 and PCO 2 were also observed in the NMV group but not in the control group. Conclusions: Three months of treatment with NMV increases both respiratory and peripheral muscle endurance in patients with CRF due to thoracic restriction. (CHEST 2001; 119:1371-1378) Abbreviations: CRF ϭ chronic respiratory failure; fresp ϭ breathing frequency; NMV ϭ noninvasive mechanical ventilation; PCV ϭ pressure-controlled ventilation; Pimax ϭ peak static inspiratory mouth pressure; V co 2 ϭ carbon dioxide elimination; VC ϭ vital capacity; VCV ϭ volume-controlled ventilation; V o 2 ϭ oxygen consumption; Vt ϭ tidal volume *From the Krankenhaus Kloster Grafschaft, Zentrum fü r Pneumologie, Beatmungs-und Schlafmedizin,
doi:10.1378/chest.119.5.1371 pmid:11348941 fatcat:qvvsvsl2xje3ziecxhmn6b6gyy