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Respiratory sensation in chronic obstructive pulmonary disease
The American Review of Respiratory Disease
|November 1, 1985
Summary
Patients with chronic obstructive pulmonary disease (COPD) have blunted perception of breathing loads. This study shows COPD patients have abnormal respiratory sensation, not reduced muscle force, impacting their experience of breathing difficulty.
Area of Science:
- Respiratory Physiology
- Sensory Perception
- Pulmonary Medicine
Background:
- Previous research indicates blunted perception of added resistive loads in patients with chronic obstructive pulmonary disease (COPD).
- The underlying cause—reduced respiratory muscle force or specific sensory abnormalities—remains unclear.
Purpose of the Study:
- To evaluate the sensation of external resistive and elastic ventilatory loads in COPD patients versus healthy individuals.
- To differentiate between sensory perception deficits and muscle force changes in COPD.
Main Methods:
- Utilized the psychophysical magnitude scaling technique.
- Assessed sensation intensity related to ventilatory loads, inspired volume, and inspiratory muscle force.
- Compared 14 COPD patients with 12 age-matched normal subjects.
Main Results:
- Significantly reduced power function exponents for resistive and elastic loads in COPD patients compared to controls.
- Comparable peak inspiratory mouth pressure and inspiratory duration between groups during loaded breathing.
- No significant differences in the perception of inspired volume or static inspiratory muscle force between COPD patients and normal subjects.
Conclusions:
- COPD patients exhibit specific abnormalities in respiratory sensation, particularly concerning ventilatory loads.
- The blunted perception of breathing difficulty in COPD is not attributable to reduced inspiratory muscle force.
- Sensory processing deficits contribute to the altered perception of respiratory loads in COPD.