Rational for the Use of Velocity-Pressure Loop in the Operating Room

For all patients, data from trans-esophageal Doppler, trans-thoracic echocardiography (TTE) and hemodynamic data are collected at the end of the procedure. During catheter withdrawal, pressure waveforms are recorded at two predefined aortic locations: in the ascending aorta and in the descending thoracic aorta just in front of the esophageal Doppler probe.