title: [Stress-induced changes in the R amplitude in the ECG in patients with arterial hypertension and chronic ischemic heart disease and following aortocoronary venous bypass].
abstract: 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. In all patients a standardized bicycle-ergometric exercise sitting and a coronarography as well as a ventriculography were performed. There is no statistically significant difference in the behaviour of the R-amplitude between patients with chronic ischaemic heart disease and persons with healthy heart. Indeed, hypertensives with chronic ischaemic heart disease significantly differ in their behaviour of the R-amplitude from persons with healthy heart, in the hypertensives with chronic ischaemic heart disease, however, the behaviour of the R-amplitude is indifferent, so that it is concluded that the criterion of the R-amplitude for the diagnosis of the chronic ischaemic heart disease in hypertensives cannot be used. An insufficient individual reproducibility supports this conclusion.
mesh_terms: D000328:Adult; D001026:Coronary Artery Bypass; D003327:Coronary Disease / Q000175:diagnosis* / Q000601:surgery; D004562:Electrocardiography; D005080:Exercise Test; D005260:Female; D006801:Humans; D006973:Hypertension / Q000175:diagnosis*; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000175:diagnosis*
vernacular_title: Belastungsinduzierte Veränderung der R-Amplitude im EKG bei Patienten mit arterieller Hypertonie und chronisch ischämischer Herzkrankheit und nach aortokoronarer Venenbypassoperation.