The influence of various anaesthetic techniques was studied during total cardiopulmonary bypass with a disc oxygenator, high flow perfusion and mild hypothermia. Data were obtained from 52 adult patients undergoing corrective surgery for congenital or acquired heart disease. The material was randomly divided in two groups with 28 and 24 patients, respectively. Before perfusion, the same anaesthetic technique was applied to all patients. During perfusion, halothane was vapourized into the oxy-