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Chest wall motion in paraplegic subjects.

A De Troyer¹, M Estenne

¹Respiratory Research Unit, Erasme University Hospital, Brussels, Belgium.

The American Review of Respiratory Disease

|February 1, 1990

Summary

Increased abdominal compliance significantly alters chest wall motion during breathing. This finding highlights the interplay between abdominal and rib cage mechanics in respiratory function.

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Area of Science:

Respiratory Physiology
Biomechanics
Neurology

Background:

Abdominal compliance influences respiratory mechanics.
Understanding chest wall motion is crucial for respiratory health.

Purpose of the Study:

To isolate and assess the impact of increased abdominal compliance on chest wall motion.
To investigate the compensatory mechanisms in respiratory muscles.

Main Methods:

Studied seven patients with midthoracic spinal cord transection (Th4-Th7).
Utilized magnetometers for chest wall motion and electromyography for respiratory muscle activity.
Analyzed anteroposterior (AP) diameters of the rib cage and abdomen.

Main Results:

Patients exhibited disproportionately larger increases in abdominal AP diameter compared to the lower rib cage.
Tidal breathing loops were displaced, indicating a departure from the relaxed thoracoabdominal configuration.
Abdominal binding reduced or suppressed this chest wall deformation.

Conclusions:

An isolated increase in abdominal compliance can deform the chest wall during breathing.
This deformation results from reduced diaphragm efficacy and altered inspiratory muscle activation.
Findings underscore the importance of abdominal compliance in maintaining normal respiratory kinematics.

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