Thoracic Fluid Content for Weaning Parameters

Inclusion Criteria: * • Patients of both genders aged 18-70 years old. * Acute Physiology and Chronic Health Evaluation II (APACHE II) score * Patients with congested lung including; Acute exacerbation of COPD patients with acute respiratory failure (PaO2/FiO2 ratio ≤300 or PaCO2 ≥ 50 mm Hg at intubation), pneumonia, chronic kidney disease, heart failure (New York Heart Association Classification III, IV) who will be candidate for weaning from invasive mechanical ventilation according to the treating physician's judgement using the ICU weaning protocol. Exclusion Criteria: * • Patients younger than 18 years or older than 70 years * Refusal to participate. * Obesity (BMI≥35). * Pregnancy. * Patients with pneumothorax, pleural, or pericardial effusion, lung contusion, and thoracotomy. * Hepatic dysfunction. * history or new detection of paralysis (no movement) or paradoxical movement of a single hemidiaphragm. * preexisting cervical spinal injury, history of neuromuscular disorders * Patients with injuries, burns, or wounds which precluded the proper application of the device electrodes will be also excluded from the study. * Mechanical ventilation \< 48 hrs