The goal of this observational study is to Compare the performance of uncalibrated pulse wave contour analysis compared with transesophageal echocardiography (TEE) to assess response to a vascular filling test during beating-heart coronary artery bypass surgery, in people over age of 18; hospitalized for scheduled beating heart bypass surgery The aim question is to evaluate the ability of a less invasive cardiac output monitor (uncalibrated pulse wave contour analysis) compared with a reference cardiac output measurement (transesophageal echocardiography) to enable optimization of vascular filling by good assessment of the response to vascular filling in a high-risk perioperative patient population. As part of hemodynamic monitoring, every patient undergoing beating-heart coronary bypass surgery is fitted with a radial arterial catheter immediately after induction of anesthesia, enabling continuous measurement of blood pressure. Hemodynamic optimization in these patients also involves fitting a transesophageal ultrasound probe to optimize cardiac output using the various therapies available (vascular filling, vasopressors, inotropes). A specific sensor (FloTrac°, Hemosphere, Edwards°) will be connected to the arterial pressure line to obtain a systolic ejection volume value by analyzing the contour of the uncalibrated pulse wave. The hemodynamic management of the patient, and the decision to perform a vascular filling test, will be left to the discretion of the practitioner in charge of the patient in the operating room.
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Response to vascular filling
Timeframe: From enrollment to completion of chirurgy (24 hours)