The diagnosis was primary endocardiac malignant fibrous histiocytoma. The patient underwent adjuvant chemotherapy and is alive and well 1 year after surgery. Reprint requests to R. Sheahan, MD, ...

In the isolated rabbit heart, it was shown that (1) manganese ions (Mn2+) (2-4 mM) suppressed the activity of atrioventricular (AV) nodal cells located in the AN, N, and NH regions without preventing ...