A correlation analysis of basic indexes of gas exchange and hemodynamics observed on day 4 postpneumonectomy was carried out in 56 patients. Factors accounting for relevant dysfunction were studied. Patterns of postoperative changes in basic parameters were established. Respiratory insufficiency was due to ventilation-perfusion balance derangement caused by obstruction and lung hypertension, and compromised pulmonary blood flow in a single lung because of decreased cardiac output.
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