In the operating room, most intubation procedures (IP) are scheduled and performed on hemodynamiccaly stable patients. In the ICU, IP is frequently performed in emergent patients, because of unstable hemodynamics and/or acute respiratory failure, and complicated by a subsequent cardiovascular collapse. Transthoracic echocardiography (TTE) has become readily available in most ICUs for several years. Echocardiography enables to perform a noninvasive hemodynamic evaluation (cardiac function and volemia status).