585 The role of tissue doppler imaging using intraoperative transesophageal echocardiography in the assessment of pulmonary filling pressures during cardiac surgery

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Cardiac surgical patients require the frequent use of invasive hemodynamic monitoring using pulmonary artery catheters (PAC) for the determination of left ventricular filling pressures (LVFP). Tissue Doppler imaging (TDI) using transthoracic echocardiography (TTE) is a validated method for the noninvasive assessment of LVFP. Using the ratio of early diastolic mitral inflow (E) to early diastolic annular velocity (E'), an E/E'<8 indicates normal LVFP, whereas E/E'>15 indicated elevated LVFP. Little is known, however, on the role of TDI using intraoperative transesophageal echocardiography (TEE) in the assessment of LVFP during cardiac surgery.