Effects of end-inspiratory pause (EIP) on respiratory function were studied in 10 patients operated curatively for esophageal cancer. During intrathoracic manipulation, markedly decreased PaO
2, and increased A-aDO
2 and Qs/Qt were observed suggesting the occurrence of plenty of atelectatic alveoli, while no significant change in PaCO
2 nor
VD/
VT was recognized. The impaired oxygenation was gradually improved with a stepwise increment of EIP added to the controlled ventilation with 5cmH
2O of positive end-expiratory pressure (PEEP) after chest was closed. With 5% of EIP, A-aDO
2 and Qs/Qt decreased significantly, but not any change in ventilation was obtained. When EIP was increased to 10%, PaO
2 increased remarkably and A-aDO
2, Qs/Qt and
VD/
VT decreased without significant change in circulation. By 15% of EIP, no more improvement in PaO
2 nor A-aDO
2 was obtained in spite of decrease in Qs/Qt and
VD/
VT. Arterial blood pressure decreased significantly followed by an increase in mean airway pressure. Considering that essential time for the redistribution of inspired gas between lung compartments is 0.4 sec and that excessive positive airway pressure is harmful to circulation, 10% of EIP with 5cmH
2O PEEP was concluded to be the most suitable combination in the controlled ventilation for the patients undergone open-chest surgery.
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