[Relationship between pulmonary circulation and respiratory mechanics in patients artificial pulmonary ventilation]

Thirty-four patients in the early postoperative period after surgery on the lungs and mediastinum and 23 patients after cardiopulmonary bypass surgery have been examined. 187 studies of central hemodynamics and pulmonary function during cardiopulmonary bypass have been performed to investigate the correlation between pulmonary hemodynamics and parameters of respiratory mechanics in the early postoperative period after thoracic surgery. The studies have revealed reverse dependence of lung and chest compliance (C) on pulmonary artery diastolic pressure (PAPdiast) (r = -0.61, p < 0.05) in patients after thoracic surgery with clinical signs of cardiopulmonary failure. When analogous studies were performed in patients with intact lungs after aortocoronary bypass, C/PAPdiast correlation was more close (r = 0.880, p < 0.05). At the same time there is a correlation between C and extracellular fluid volume (r = -0.7). The above correlations to a great extent predetermine the pathogenesis of respiratory failure in the postoperative period.