Cardiothoracic Surgery and Department of Critical Care Medicine;
Faculty of Medicine;
Benha University;
Egypt;
Department of Chest;
Benha University Hospital;
Benha;
Egypt;
Anesthesia and Intensive Care Department;
Benha;
Egypt;
Cardiothoracic Surgery;
Benha University;
Benha;
Egypt;
Internal Medicine;
Ministry of Health;
Cairo;
Egypt;
Open; Heart; Surgery; Venture; Mask; CPAP; Mask; Non; Invasive; Ventilation; O2; Therapy;