LTV (Low Tidal Volüme) Ventilation and Diaphragmatic Motion in CABG (Coronary Artery Bypass Grafting)

"Group Low: Patients in this group will receive low tidal volume mechanical ventilation during cardiopulmonary bypass (CPB).~Ventilation settings will be:~Tidal Volume: 3-4 mL/kg (ideal body weight)~PEEP: 5-8 cmH₂O~Respiratory Rate: adjusted to maintain normocapnia (PaCO₂ 35-45 mmHg)"