 The aim of this work is to compare three methods of measure of the PAP: the measure TRVMAX by means of the tricuspid leak by transthoracic echocardiography, the measure of the TAAP by transesophageal ultrasound and the direct measure of the pulmonary pressures by right catheterization, in ventilated patients already monitored with a catheter in the right cavities for usual indications in intensive care ARDS, shock. We shall analyze then the correlation between the TRVmax, the TAAP and the pressures measured by the right catheterism which serves as reference technique. 