Complete atrioventricular block occurred during spinal and subsequent general anaesthesia in a 74-year-old patient with known arterial hypertension but without heart conduction abnormality. Drug therapy and intermittent transcutaneous pacing was successful. A decrease of arterial pressure by more than 40% preceded the heart blockade in the course of both events. Subsequent cardiologic examination revealed evidence of a discrete hypertensive heart disease. Relative ischemia of the atrioventricular region during anaesthesia was suggested as an aetiology. When the patient presented for the next operation, again general anaesthesia was applied, and invasive arterial blood pressure monitoring as well as catecholamine support were used and no further atrioventricular blockade occurred. The case demonstrates the possible recurrence of an intraoperative complete atrioventricular blockade in an older patient without pre-existing conduction abnormalities and only minor signs of heart disease, irrespective of the anaesthesia technique. Under these circumstances transcutaneous pacing should always be in place. Maintenance of coronary perfusion pressure is essential and invasive blood pressure monitoring is recommended.