HISTOLOGIC-FINDINGS OF TRANSMYOCARDIAL LASER CHANNELS AFTER 2 HOURS

Histologic examination of the human myocardium has been performed seve ral days, weeks, and months after transmyocardial laser revascularizat ion. We performed microscopic examinations 2 hours postoperatively. In addition to the patent channel (diameter, 1 mm) and a 1- to 2-mm rim of necrosis, a 1- to 3-mm zone of myofibrillary degeneration was found . This additional reversible injury immediately after transmyocardial laser revascularization could explain the higher mortality rate in pat ients with reduced left ventricular function. (C) 1998 by The Society of Thoracic Surgeons.