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Inspiratory muscle function in unilateral diaphragmatic paralysis
The American Review of Respiratory Disease
|September 1, 1986
Summary
Unilateral diaphragmatic paralysis (UDP) alters breathing patterns and impairs inspiratory muscle strength, especially when cardiopulmonary disease is present. This study investigated these effects in patients with UDP.
Area of Science:
- Respiratory Physiology
- Diaphragm Function
- Muscle Strength Assessment
Background:
- Pulmonary function is well-studied in unilateral diaphragmatic paralysis (UDP).
- Limited information exists on inspiratory muscle function in UDP patients.
- This study addresses the gap in understanding inspiratory muscle adaptation in UDP.
Purpose of the Study:
- To investigate inspiratory muscle function in patients with unilateral diaphragmatic paralysis (UDP).
- To compare inspiratory muscle function in UDP patients with and without concomitant cardiopulmonary disease.
- To identify abnormal breathing patterns associated with UDP.
Main Methods:
- Studied 8 patients with UDP (Group 1) and 7 with UDP and cardiopulmonary disease (Group 2).
- Included 12 healthy subjects as controls.
- Measured maximal static transdiaphragmatic and inspiratory mouth pressures at FRC.
- Recorded gastric (Pga), esophageal (Pes), and transdiaphragmatic (Pdi) pressure swings during quiet breathing.
Main Results:
- No difference in inspiratory muscle function between left-sided and right-sided UDP.
- Paradoxical Pga swings observed in most UDP patients.
- Maximal Pdi and inspiratory pressures were reduced, particularly in Group 2.
- Abnormal respiratory muscle recruitment patterns identified during quiet breathing.
Conclusions:
- Unilateral diaphragmatic paralysis (UDP) is linked to altered respiratory muscle use during quiet breathing.
- Compensatory mechanisms involve intercostal, accessory inspiratory, or abdominal expiratory muscles.
- Inspiratory muscle strength impairment is present in UDP and exacerbated by cardiopulmonary disease.