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The effects of talc pleurodesis on growing swine
E D McGahren1, W G Teague, T Flanagan
1Department of Surgery, University of Virginia Health Sciences Center, Charlottesville 22908.
Insights
Talc pleurodesis temporarily reduces lung compliance in growing animals, with dynamic measures recovering over time. Static compliance remains reduced, though shows improvement, indicating potential long-term effects.
Area of Science:
- Pulmonary Medicine
- Thoracic Surgery
- Pediatric Respiratory Health
Background:
- Talc pleurodesis is effective for recurrent pneumothorax, particularly in children with cystic fibrosis.
- The impact of talc pleurodesis on lung compliance in developing lungs is not well understood.
Purpose of the Study:
- To investigate the effects of talc pleurodesis on dynamic and static lung compliance in growing pigs.
- To assess the temporal changes in respiratory mechanics following talc pleurodesis.
Main Methods:
- Six young pigs underwent unilateral talc pleurodesis (TALC) via thoracoscopy, with the contralateral hemithorax serving as control (thoracoscopy alone or no procedure).
- Respiratory mechanics, including dynamic and static transpulmonary and transrespiratory compliance, were measured at 5 and 10 weeks post-procedure.
Main Results:
- Dynamic lung compliance was reduced in TALC-treated lungs at 5 weeks but normalized by 10 weeks.
- Static lung compliance was persistently lower in TALC lungs compared to controls, with significant reduction at 10 weeks.
- Autopsy revealed pleural adhesions and thickening in TALC lungs, but no parenchymal differences.
Conclusions:
- Talc pleurodesis causes transient impairment of dynamic lung compliance that resolves with growth.
- Static lung compliance is more persistently affected, though a trend towards improvement is observed.
- Talc pleurodesis leads to pleural changes but does not affect lung parenchyma in growing animals.
Abstract:
Talc pleurodesis is an effective means of preventing recurrent pneumothorax. We have successfully applied talc pleurodesis with thoracoscopy in children with cystic fibrosis presenting with pneumothorax. However, little is known about the effects of talc pleurodesis on lung compliance in growing children. Therefore, six young pigs (10 weeks old, weighing 15 +/- 1 kg) were prepared for study. In each pig, one hemithorax underwent thoracoscopy and talc pleurodesis (TALC). The other hemithorax underwent either thoracoscopy alone or no procedure (CONTROL). Dynamic and static respiratory mechanics were studied 5 and 10 weeks later. Air flow and airway pressure were measured to calculate dynamic transpulmonary and transrespiratory compliance, and static transpulmonary compliance. At 5 weeks, dynamic transpulmonary and transrespiratory compliance were less in the TALC lungs when compared with CONTROL lungs. At 10 weeks, the differences in dynamic transpulmonary and transrespiratory compliance between the TALC and CONTROL lungs had resolved. Static compliance was lower in the TALC lungs than in the CONTROL lungs at both 5 and 10 weeks, but this was significant only at 10 weeks. There was an improvement in static compliance in the TALC lungs between 5 and 10 weeks, but this only approached significance. At autopsy, there were marked adhesions and pleural thickening in the talc lungs. Histological examination demonstrated no differences in lung parenchyma between the TALC lungs and the CONTROL lungs. Talc pleurodesis causes a temporary impairment in dynamic transpulmonary and transrespiratory compliance that resolves with time and growth. Static compliance is more persistently compromised, but a trend toward improvement with time and growth exists.(ABSTRACT TRUNCATED AT 250 WORDS)