 - normal lung ultrasound ultrasound A profile: the patient will be evaluated for deep vein thrombosis pulmonary embolism andor for reversible airway obstruction e.g. uncontrolled asthma or COPD Chronic Obstructive Pulmonary Disease exacerbation- followed by appropriate treatment. If the patient has COPD, non invasive mechanical ventilation must be used as mode of discontinuing mechanical ventilation; 