76 patients after aortocoronary venous bypass operation , 34 patients with essential arterial hypertension at stage i or ii ( who ) and chronic ischaemic heart disease , 96 patients with a chronic ischaemic heart disease of different degree of severity and 20 persons with healthy heart were examined concerning their behaviour of the r-amplitude in the exercise electrocardiogram .
C0010055
aortocoronary
C0018787
heart