Data collection
Patient demographics, medical history, clinical records, laboratory tests, and ventilator data were collected and analyzed. Blood gas analysis and echocardiography were performed at the same day. The associations between cardiac parameters and ventilator treatment were analyzed. The patients were followed up from the day that mechanical ventilation was implemented to assist breathing to the day of weaning from ventilation (1‒30 days). Death was classified as a failure to wean the patient from the ventilator.