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[Signs of myocardial ischemia based on nocturnal circulatory changes in coronary patients].

During one preoperative night blood pressures, heart rates and changes in ST-segments of ECG were measured at hourly intervals in 20 male patients suffering from a two or more coronary vessel disease. In five patients one or more events of increased myocardial ischaemia were seen in the ECG without any of the patients remembering an attack of angina pectoris. The circulatory function during these periods showed no connection between ST-segment-changes and extremely high or low levels of blood pressure and/or heart rate. Therefore from this investigation nothing can be said about borderline levels of blood pressure and heart rate terminating safe anaesthesia.