The safety and efficacy of adenosine pharmacological stress is even better with concomitant exercise. In the light of these benefits we recommend AdenoEX whenever possible.

A case of rhabdomyosarcoma of the heart diagnosed through biopsy material and confirmed by autopsy is reported because of the few recorded instances and the unusually diffuse nature of t h e neoplasm. The h e a r t with tumor weighed 1450 g. There was a single metastasis t o a mediastinal lymph node. PPROXIMATELY 200 SARCOMAS PRIMARILY A involving the myocardium have been re-rorded, 31 of which were rhabdomyosarco-mas.' Because of the few recorded instances and the unusually diffuse nature of the neo-plasm we encountered, the following additional case is being reported.

The mechanism of the ventricular tachycardia was unclear.The electrophysiology study was not sufficiently reliable in the patient with recurrent ventricular tachycardia and bilateral coronary artery to pulmonary artery fistulae. The therapy of choice and the prevention of sudden death in this case was an implantable cardioverter defibrillator.

Despite coronary vessel occlusion, collateral blood flow maintains the pump function of the left ventricle.

Malignant ventricular arrhythmias can result from isolated inferior wall AMI, but literature reports on this phenomenon are rather rare. Collateral circulation can prevent myocardial ischemia and preserve myocardial function, but does not provide protection against exercise-induced myocardial ischemia.