Functional Inspiratory Versus Expiratory Muscle Electrical Stimulation on Weaning Outcomes in Mechanically Ventilated Patients

The Goal of This Clinical Trail is * To find out the difference in the effect of inspiratory muscle functional electrical stimulation and expiratory muscle functional electrical stimulation on weaning outcomes mechanically ventilated patients. * To investigate the effect of inspiratory muscle functional electrical stimulation and expiratory muscle functional electrical stimulation on Laboratory investigation (Arterial Blood Gases). * To investigate the effect of inspiratory muscle functional electrical stimulation and expiratory muscle functional electrical stimulation on Sonar parameters (Diaphragmatic excursion, Diaphragmatic muscle fractional thickness in the end of inspiration and the end of expiration and abdominal muscles wall thickness). To evaluate the effect of inspiratory muscle functional electrical stimulation and expiratory muscle functional electrical stimulation on (ICU length of stay and Spontaneous Breathing Trail (SBT)).