BCA BCA Thoracic & Vascular Anesthesia

Question 1

During one-lung ventilation (OLV), the MOST common cause of hypoxemia is:

Accepted Answer

Hypoxic pulmonary vasoconstriction failure in the non-ventilated lung

Answer

Excessive tidal volume to the ventilated lung

Answer

CO2 retention

Answer

Endotracheal tube cuff leak

Question 2

A double-lumen endotracheal tube (DLT) is placed for left lung surgery. Correct positioning is confirmed by:

Accepted Answer

Clinical auscultation and fiberoptic bronchoscopy

Answer

Chest X-ray only

Answer

Capnography alone

Answer

Pulse oximetry alone

Question 3

During thoracic aortic cross-clamping, the MOST critical consequence of prolonged clamp time is:

Accepted Answer

Spinal cord ischemia leading to paraplegia

Answer

Pulmonary edema

Answer

Renal artery thrombosis

Answer

Hepatic infarction

Question 4

Cerebrospinal fluid (CSF) drainage during thoracic aortic aneurysm repair is used to:

Accepted Answer

Increase spinal cord perfusion pressure by lowering CSF pressure

Answer

Prevent PONV

Answer

Reduce spinal cord perfusion pressure

Answer

Treat intraoperative seizures

Question 5

Which volatile anesthetic MOST inhibits hypoxic pulmonary vasoconstriction (HPV)?

Accepted Answer

All volatiles inhibit HPV equally at equipotent doses

Answer

Sevoflurane at 1 MAC

Answer

Isoflurane at 1 MAC

Answer

Desflurane at 1 MAC

Question 6

A patient undergoes pneumonectomy. Postoperative fluid management should be conservative primarily because of the risk of:

Accepted Answer

Pulmonary edema in the remaining single lung

Answer

Deep vein thrombosis

Answer

Hepatic congestion

Answer

Urinary retention