[Do we always have the possibility to treat "lege artis"?].

The case-history occupies of a case of acute cardiac insufficiency in a patient at early postoperative period, who underwent a small surgical operation. Apparently the banal operation became the starting mechanism of life threatening cardiopulmonary insufficiency. Transthoracic echocardiografic diagnostic process not gave us the unambiguous response about a cause of that distressed state. The primary clinical consideration of the pulmonary embolization was not ambiguously acknowledged, though nor excluded. The clinical had to decided, whether the heparinization or the thrombolysing treatment was justified.