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Chest, Vol 92, 984-990, Copyright © 1987 by American College of Chest Physicians

ARTICLES

Pre- and postoperative inspiratory mechanics in ischemic and valvular heart disease

JO Auler Jr, WA Zin, MP Caldeira, WV Cardoso and PH Saldiva
Instituto do Coracao, HC-FMUSP- Sao Paulo, Brazil.

In 12 mechanically-ventilated, anesthetized, paralyzed patients undergoing cardiac surgery for either coronary bypass (six subjects) or to correct valvular disfunctions, volume, airflow, tracheal, esophageal, and transpulmonary pressures were measured. Respiratory system elastance and resistance were partitioned into lung and chest wall components. Resistances were further split into homogeneous and uneven elements. Measurements were performed prior to thoracotomy and just after rib cage closure. Before surgery, valvular patients had significantly higher elastances and uneven resistances of the respiratory system and lung than those with ischemic heart disease. Postoperatively, the patients presented with an increase in respiratory system and lung elastances, a decrease in pulmonary resistance, and a rise in chest wall resistance. Surgically induced mechanical changes were similar in ischemic and valvular patients.


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