Assessing thoracoabdominal asynchrony

The traditional method of derivation of phase difference between ribcage and abdomen breathing movements from a Lissajous plot is shown to be unsatisfactory for assessing the degree of asynchrony. The signal processing technique of cross‐correlation is introduced as a better, statistically based app...

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Bibliographic Details
Published in:Clinical physiology (Oxford) 2001-05, Vol.21 (3), p.383-385
Main Authors: Black, A. M. S., Millard, R. K.
Format: Article
Language:English
Subjects:
Apnea - diagnosis
apnoea detection
Biological and medical sciences
Calibration
Humans
inductive plethysmography
Investigative techniques of respiratory function
Investigative techniques, diagnostic techniques (general aspects)
Medical sciences
Models, Theoretical
Plethysmography - methods
Plethysmography - statistics & numerical data
Respiratory Mechanics
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Summary:The traditional method of derivation of phase difference between ribcage and abdomen breathing movements from a Lissajous plot is shown to be unsatisfactory for assessing the degree of asynchrony. The signal processing technique of cross‐correlation is introduced as a better, statistically based approach. Even so, examination of the latent structure of a Lissajous figure leads to the concept of movement sum and difference components along its principal axes. This more general form of analysis is used for indicating relative changes in tidal volume during postoperative monitoring of Cheyne–Stokes breathing with obstructive apnoea, as well as tracking the degree of asynchrony. The theoretical and practical limitations of inductive plethysmography calibrations are such that the proposed methods of uncalibrated non‐invasive respiratory monitoring are also preferable as research tools.
ISSN:0144-5979
1365-2281
DOI:10.1046/j.1365-2281.2001.00325.x