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Diaphragm function after pulmonary resection. Relationship to postoperative respiratory failure.
1First Department of Surgery, Osaka University Medical School, Japan.
The American Review of Respiratory Disease
|March 1, 1988
Summary
Pulmonary resection surgery impacts respiratory muscle function, reducing maximal diaphragm strength. While quiet breathing mechanics are preserved, increased accessory muscle use may indicate compensatory mechanisms post-surgery.
Area of Science:
- Pulmonary Medicine
- Respiratory Physiology
Background:
- Pulmonary resection surgery can significantly alter lung mechanics and respiratory muscle function.
- Understanding these changes is crucial for managing postoperative respiratory outcomes.
Purpose of the Study:
- To investigate lung mechanics and respiratory muscle function in patients before and after pulmonary resection.
- To identify predictors of postoperative respiratory complications.
Main Methods:
- Studied 20 patients undergoing pulmonary resection.
- Measured transdiaphragmatic pressure (delta Pdi), abdominal to transdiaphragmatic pressure changes (delta Pab/delta Pdi), maximal transdiaphragmatic pressure (Pdimax), and maximal inspiratory mouth pressure (MIP).
- Analyzed data for correlations with work of breathing and respiratory failure.
Main Results:
- Postoperative delta Pab/delta Pdi significantly decreased and correlated with work of breathing.
- Maximal transdiaphragmatic pressure (Pdimax) significantly decreased post-surgery.
- Four patients developed respiratory failure, showing significantly lower delta Pab/delta Pdi compared to others.
- Maximal inspiratory mouth pressure (MIP) showed no significant change.
Conclusions:
- Diaphragmatic function during quiet breathing appears preserved post-pulmonary resection.
- Increased recruitment of intercostal/accessory muscles may compensate for reduced maximal diaphragmatic strength.
- Postoperative delta Pab/delta Pdi is a potential indicator of respiratory complications.