Severe left ventricular dysfunction in left atrial myxoma--report of 2 cases.

We report 2 patients with left atrial (LA) myxoma with associated severe left ventricular (LV) dysfunction. Both presented with progressive effort intolerance without a history suggestive of acute coronary event. LA myxoma was diagnosed by transthoracic echocardiography, which also detected severe systolic dysfunction and LV dilatation. Regional wall motion abnormality and thinning were absent. Coronary angiograms also showed no occlusive disease, but distal ectasia was seen in 1 patient. Metabolic and endocrine causes of reversible LV dysfunction were excluded. Cardiac function improved following surgery for myxoma in 1 patient. LV dysfunction, thus far, has not been directly attributed to myxoma. Coronary embolization leading to myocardial infarction and coexisting coronary atherosclerosis are the recognized methods by which LV dysfunction manifests in myxoma. Our report suggests the possibility of reversible severe global LV dysfunction due to cardiodepressant effect of myxoma through as yet unclear mechanisms.