Acute Effect of Positive Expiratory Pressure Versus Breath Stacking Technique After Cardiac Surgery

The patients will perform the maneuver through successive inspiratory efforts for 20 s. Subsequently, the expiratory branch will be unobstructed to allow expiration. This maneuver will be repeated 5 times in each series, with intervals of 30 seconds between them. The technique will be performed with the trunk inclined 30º in relation to the horizontal plane, in 3 series, with interval of 2 min completing 15 min of therapy.

Patients will perform exhalation of air through a facial mask containing an extrinsic positive expiratory pressure valve with a defined load of 10 cmH2O for 5 min. During the application of the technique the patients will have a trunk inclined 30º and will be stimulated to breathe normally, without effort or deep and fast breaths.