In one hundred consecutive cases in which operations were done on the heart with the surgical field exposed to view and circulation was shunted to extracorporeal apparatus, there were six deaths. None were attributable to the by-pass procedure. The lesions were of various kinds, congenital and acquired. In one case a fibromyxosarcoma that was obstructing the right ventricular outflow tract and invading the main pulmonary artery was successfully excised.
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