Transsarcolemmal Ca2+ influx via Na+/Ca2+ exchange may be responsible for abnormal intracellular Ca2+ transient documented in myocardium from patients with end-stage heart failure: Yasuki Kihara, and James P. Morgan. The Second Department of Internal Medicine, Toyama Medical and Pharmaceutical University, Toyama, Japan, and Cardiovascular Division Beth Israel Hospital, and Harvard Medical School, Boston, MA