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Evaluation of pulmonary function in the ischemic expanded canine lung
Surgery, Gynecology & Obstetrics
|April 1, 1976
Summary
Pulmonary ischemia exceeding six hours in dogs led to severe lung edema and congestion. Continuous lung expansion at 10 cmH2O during ischemia was more beneficial than at 25 cmH2O, improving oxygenation and lung function recovery.
Area of Science:
- Cardiovascular and Respiratory Physiology
- Pulmonary Medicine
- Surgical Research
Background:
- Pulmonary ischemia can lead to significant lung injury, including edema and congestion.
- Understanding the limits of pulmonary ischemia tolerance is crucial for surgical interventions.
Purpose of the Study:
- To determine the maximum tolerable period of pulmonary ischemia before irreversible lung damage occurs.
- To evaluate the impact of continuous lung expansion pressures on mitigating ischemia-reperfusion injury.
Main Methods:
- In vivo left pulmonary hilar occlusion in 24 dogs.
- Continuous lung expansion at 10 cmH2O and 25 cmH2O during occlusion.
- Monitoring for pulmonary edema, congestion, and survival post-revascularization.
- Assessing lung function recovery using isotope uptake for ventilation and perfusion.
Main Results:
- Pulmonary edema and congestion leading to death occurred in 50% of dogs with hilar occlusion exceeding six hours.
- Continuous lung expansion at 10 cmH2O was more protective than at 25 cmH2O.
- Cyclic ventilation with negative-expiratory pressure offered less support than continuous expansion.
- Survivors showed near-normal ventilation, perfusion, and oxygen uptake within three weeks.
Conclusions:
- Pulmonary ischemia beyond six hours is poorly tolerated, causing significant lung injury.
- Continuous lung expansion during ischemia, particularly at lower pressures (10 cmH2O), aids in preventing alveolar collapse and improving oxygenation.
- Lung expansion strategies may be vital in managing ischemia-reperfusion injury in pulmonary surgery.