Maximum Expiratory Pressure in Induced Cough as a Predictor of Extubation Failure

"* patient in the supine position sitting 45° to 60°,~* closed suction catheter was removed~* a 90° elbow was placed and a bacterial filter in series with endotracheal tube~* adapter was also coupled to the aneroid pressure gauge~* in series an inspiratory unidirectional valve was placed that did not allow expiration~* 2 ml of physiological solution was slowly instilled through the port in the 90º elbow to cause induced cough"