Placement of a double lumen tube for lung surgery is best confirmed by –: (A) EtCO2, (B) Airway pressure measurement, (C) Clinically by auscultation, (D) Bronchoscopy
Answer is D. ↵

Best confirmation of tracheal placement (i.e. detection whether tube is in trachea or esophagus) → capnography (end tidal CO2)
Best confirmation of double lumen tube placement (whether in trachea or bronchus) → flexible fibreoptic bronchoscopy.