“…Histological examination has revealed damage to the myocardium in the form of elective, myocardium necrosis following administration of high doses of fenoterol to animals (8) and to human, fetal, myocardial cells in vitro (5,13). However, neither these findings, which were obtained in vitro, nor the clinical symptoms of an increase of pulse rate and enlarged blood pressure amplitude, are evidence of myocardial damage to the human heart in vivo.…”