 The measure of the pulmonary artery pressure PAP is a very useful index in intensive care to estimate right ventricular after load. The reference technique for this measure is the right catheterism which is an invasive technique. It is possible to estimate the pulmonary artery pressure by using transthoracic echocardiography TTE which allows, using the continuous Doppler, the measure of maximum speed of tricuspid regurgitation TRvmax. The measure of the TRvmax can however be difficult for intensive care patients with little echogenicity or impossible for those having no tricuspid leak. The evaluation of the tricuspid regurgitation is also particularly difficult using TOE. To avoid these drawbacks, one can use the analysis of the pulmonary ejection in the pulmonary artery PAAT with TOE. However, the data of the literature are controversial on this method and it was not validated in mechanically ventilated intensive care patients. 