Quick Search:

uzh logo
Browse by:
bullet
bullet
bullet
bullet

Zurich Open Repository and Archive 

Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-47685

Brüllmann, G; Fritsch, K; Thurnheer, R; Bloch, K E. Respiratory monitoring by inductive plethysmography in unrestrained subjects using position sensor-adjusted calibration. 2010, University of Zurich, Faculty of Medicine.

[img]PDF (Dissertation G. Brüllmann) - Registered users only
499Kb

Abstract

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

Item Type:Dissertation
Referees:Bloch K E
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Clinic for Pneumology
DDC:610 Medicine & health
Date:2010
Deposited On:22 Mar 2011 10:32
Last Modified:17 Oct 2012 05:06
Additional Information:http://www.zora.uzh.ch/28325/

Users (please log in): suggest update or correction for this item

Repository Staff Only: item control page