[The preoperative evaluation of factors influencing low output syndrome in cardiac surgery (author's transl)].

For a preoperative evaluation of the factors influencing low output syndrome significatively in open heart surgery where statistically studied 15 factors upon a pattern of 400 patients operated with extracorporeal circulation: age, sex, weight; functional class; cyanosis; pulmonary hypertension; cardiopathy; arterial blood hypertension; myocardiopathy; left ventricular end-diastolic pressure; cardiac index; cardiothoracic index; aortic clamp duration; reoperation; extracorporeal circulation technique. Significant risk factors are: myocardiopathy; aortic clamp duration; functional class; pulmonary hypertension; reoperation; cardiac index; cardiothoracic index and arterial blood hypertension. These factors increase the studied pattern mean risk respectively of a 17.6%; 27.8%; 17.5%; 14.5%; 13.7%; 10.7%; 8.8% and 8.7%. Also myocardial protection technique was considered to be a significant risk factor, since mean risk for low output syndrome is much higher for these patients operated with the coronary perfusion, normothermy and simple hypothermy than for those operated with hypothermia and pharmacologic cardioplegia.