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Perioperative transesophageal echocardiographic evaluation of the native mitral valve.

During the past few decades, the effect of intraoperative transesophageal echocardiography's (TEE) influence on perioperative cardiac surgical decision making has become increasingly more appreciated. To date, there are no prospective, large-scale, randomized trials that have specifically identified a consistent, independent advantage for intraoperative TEE. However, data from several clinical investigations have consistently implicated an important, clinically significant, and cost-effective role for TEE as a safe and valuable hemodynamic monitor in identifying high-risk patients, in assisting in the determination of the definitive surgical approach, and in providing a timely post-cardiopulmonary bypass evaluation of the procedure, thereby allowing for the opportunity to immediately re-intervene or to at least triage patients appropriately. In addition, intraoperative TEE has been instrumental in diagnosing cardiac and associated great vessel pathology and in identifying structural abnormalities, including the presence and extent of congenital abnormalities, aortic disease, intracardiac masses, and pericardial disease. Intraoperative TEE, however, has perhaps been most useful for the perioperative evaluation of cardiac valvular disease, especially during surgical procedures involving the mitral valve. This article will focus primarily on the role of intraoperative TEE in defining mitral valve anatomy, the pathogenesis and mechanism of mitral valve pathology, and its influence on perioperative clinical decision making in patients undergoing mitral valve surgery.