Document Detail

Respiratory monitoring by inductive plethysmography in unrestrained subjects using position sensor-adjusted calibration.
MedLine Citation:
PMID:  19365103     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Portable respiratory inductive plethysmography (RIP) is promising for noninvasive monitoring of breathing patterns in unrestrained subjects. However, its use has been hampered by requiring recalibration after changes in body position. OBJECTIVES: To facilitate RIP application in unrestrained subjects, we developed a technique for adjustment of RIP calibration using position sensor feedback. METHODS: Five healthy subjects and 12 patients with lung disease were monitored by portable RIP with sensors incorporated within a body garment. Unrestrained individuals were studied during 40-60 min while supine, sitting and upright/walking. Position was changed repeatedly every 5-10 min. Initial qualitative diagnostic calibration followed by volume scaling in absolute units during 20 breaths in different positions by flow meter provided position-specific volume-motion coefficients for RIP. These were applied during subsequent monitoring in corresponding positions according to feedback from 4 accelerometers placed at the chest and thigh. Accuracy of RIP was evaluated by face mask pneumotachography. RESULTS: Position sensor feedback allowed accurate adjustment of RIP calibration during repeated position changes in subjects and patients as reflected in a minor mean difference (bias) in breath-by-breath tidal volumes estimated by RIP and flow meter of 0.02 liters (not significant) and limits of agreement (+/-2 SD) of +/-19% (2,917 comparisons). An average of 10 breaths improved precision of RIP (limits of agreement +/-14%). CONCLUSIONS: RIP calibration incorporating position sensor feedback greatly enhances the application of RIP as a valuable, unobtrusive tool to investigate respiratory physiology and ventilatory limitation in unrestrained healthy subjects and patients with lung disease during everyday activities including position changes.
Gregor Br?llmann; Karsten Fritsch; Robert Thurnheer; Konrad E Bloch
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Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-04-08
Journal Detail:
Title:  Respiration; international review of thoracic diseases     Volume:  79     ISSN:  1423-0356     ISO Abbreviation:  Respiration     Publication Date:  2010  
Date Detail:
Created Date:  2009-12-04     Completed Date:  2010-02-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0137356     Medline TA:  Respiration     Country:  Switzerland    
Other Details:
Languages:  eng     Pagination:  112-20     Citation Subset:  IM    
Copyright Information:
Copyright 2009 S. Karger AG, Basel.
Pulmonary Division, Department of Internal Medicine, University Hospital Zurich, CH-8091 Zurich, Switzerland.
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MeSH Terms
Case-Control Studies
Middle Aged
Plethysmography, Whole Body / instrumentation,  methods*
Pulmonary Disease, Chronic Obstructive / diagnosis*
Tidal Volume
Young Adult

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