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Effect of chest wall vibration timing on peak expiratory flow and inspiratory pressure in a mechanically ventilated lung model.

Abstract：

OBJECTIVE:To investigate the effects of chest wall vibration timing on air flow and pressure in a ventilated lung model. DESIGN:Laboratory-based bench study. PARTICIPANTS:Thirty physiotherapists with experience in intensive care. INTERVENTION:Physiotherapists applied three sets of eight chest wall vibrations to an intubated, mechanically ventilated mannequin. Vibrations were applied at the start of expiration (optimal), mid to late inspiration (early) and early to mid expiration (late). Air flow, peak pressure and volume were measured continuously. Forces applied during vibrations were recorded using a force-sensing mat, placed under the physiotherapists' hands. RESULTS:During optimal and early vibrations, peak expiratory flow increased significantly compared with baseline ventilation [mean difference for optimal vibrations 8.8l/minute, 95% confidence interval (CI) 6.0 to 11.6; mean difference for early vibrations 7.0l/minute, 95% CI 4.3 to 9.9]. Late vibrations did not enhance expiratory flow. Peak inspiratory pressure was significantly higher during early vibrations compared with baseline values (mean difference 5.6cmH(2)O, 95% CI 2.9 to 8.2). Peak inspiratory pressure generated during early vibrations was, on average, 8.4cmH(2)O greater than with optimal timing. CONCLUSION:The safety and effectiveness of respiratory physiotherapy treatments are likely to be influenced by the timing of vibrations within the breath cycle. Early vibrations generate potentially dangerous peak inspiratory pressures. Late vibrations, although not harmful, are not effective at increasing peak expiratory flow. This is an important consideration when training physiotherapists and evaluating outcomes of treatments in intensive care.

journal_name

Physiotherapy

journal_title

Physiotherapy

authors

Shannon H,Stiger R,Gregson RK,Stocks J,Main E

doi

10.1016/j.physio.2010.02.007

subject

Has Abstract

pub_date

2010-12-01 00:00:00

pages

344-9

issue

4

eissn

0031-9406

issn

1873-1465

pii

S0031-9406(10)00035-0

journal_volume

96

pub_type

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