bradycardia , and both ventricular and supraventricular tachycardia . Palpitation , hemorrhage , heart failure , myocardial infarction , cardiac arrest , atrial fibrillation , AV block , prolonged QT interval , extrasystoles , myocardial ischemia , deep vein thrombosis , angina pectoris , pallor , cardiopulmonary arrest , cyanosis , and