Atrial myxoma as a complication of tocolytic therapy. A case report.

A 27-year-old woman who presented with premature labor was given ritodrine for tocolysis. During the administration of the beta-sympathomimetics she developed cardiac changes, including subendocardial ischemia on EKG and an intermittent early diastolic sound. Echocardiography revealed a large left atrial myxoma. It was removed during pregnancy, and the patient tolerated the procedure well. The mechanism of the ischemia was believed to result from the space-occupying mass of the myxoma, preventing adequate atrial filling and subsequent congestive failure. It is recommended that patients who develop cardiac symptoms during tocolysis with beta-sympathomimetics undergo further investigation to rule out under-lying pathology.