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)).
Their ages range from 45 to 65 years.
Their BMI is from 25-29.9kg/m2.
Mechanically ventilated for at least 24 hours.
They all have hypoxemic respiratory failure
Hemodynamically unstable patients.
Patients with rib fractures.
Patients with implanted pacemaker.
Obese (BMI greater than 30 kgm2).