10 Random Questions
Each of the following statements about the blood supply of the spinal cord is true EXCEPT:
- (A) The anterior spinal artery is made up of branches from the vertebral, intercostal, and iliac arteries
- (B) The segmental blood supply of the cord depends upon the location of the arteria radicularis magna (Adamkiewicz)
- (C) The posterior spinal arteries supply most of the spinal cord
- (D) Obstruction of the inferior vena cava increases blood flow through the epidural venous plexus
- (E) The spinal cord is supplied by one anterior spinal artery and two posterior spinal arteries
During anesthesia, the ventilation/perfusion ratios change
- (A) to preferential ventilation of the dependent portion
- (B) due to cephalad shift of the diaphragm
- (C) by insignificant amounts from that in the awake state
- (D) to preferential perfusion of the superior portion
- (E) from changes in pulmonary compliance
During laser microsurgery of the larynx using an endotracheal tube, a fire occurs in the airway. Which of the following is the most appropriate initial management?
- (A) Increase FiO2 to 1.0
- (B) Instill saline into the endotracheal tube
- (C) Perform cricothyroidotomy
- (D) Remove the endotracheal tube
- (E) Ventilate with air
In an infant, spinal anesthesia to a sensory level of T8 is achieved with tetracaine administered at the L2-3 interspace. Compared with spinal anesthesia to the same sensory level in an adult, this anesthetic is associated with a
- (A) greater decrease in blood pressure
- (B) higher risk for neurotoxicity
- (C) higher risk for systemic toxicity
- (D) lower risk for spinal cord injury
- (E) shorter duration of action
The tracing indicates that the pacemaker generator is
- (A) malfunctioning
- (B) VVT sensing and capturing normally
- (C) VOO sensing and capturing normally
- (D) DVI sensing and capturing normally
- (E) VVI sensing and capturing normally
After inflation of both the tracheal and endobronchial cuffs of a left-sided double-lumen tube, the following are noted on auscultation of the chest: Left lumen clamped --> Breath sounds absent bilaterally; Right lumen clamped --> Breath sounds present on left only; Both lumens open --> Breath sounds present on left only. The most appropriate action is to
- (A) decrease the endobronchial cuff volume
- (B) decrease the tracheal cuff volume
- (C) reinsert the tube, rotating it 180 degrees to the right
- (D) suction both lumens
- (E) withdraw the tube slightly and repeat the auscultory maneuvers
An infant becomes cyanotic and hypotensive after ventilatory pressures increase to 45 cm H2O during closure of the abdominal wall at the end of a gastroschisis repair. The most appropriate next step is to
- (A) administer a muscle relaxant
- (B) administer 5% dextrose in lactated Ringer's solution 10 ml/kg
- (C) change the endotracheal tube
- (D) ask the surgeon to insert a chest tube
- (E) ask the surgeon to reopen the abdomen
Unilateral or bilateral diaphragmatic paralysis is a complication of each of the following EXCEPT
- (A) surgical ligation of a patent ductus arteriosus
- (B) use of pericardial ice-slush for topical cardiac hypothermia
- (C) stellate ganglion block
- (D) interscalene brachial plexus block
- (E) C6 cervical fracture-dislocation
A 73-year-old woman with a preoperative serum creatinine concentration of 2.1 mg/dl develops oliguria during enflurane anesthesia. Urine sodium concentration is 10 mEq/L and urine osmolality is 450 mOsm/L. The most likely cause of these findings is
- (A) acute renal failure
- (B) chronic renal insufficiency
- (C) decreased renal perfusion
- (D) fluoride nephrotoxicity
- (E) intraoperative administration of furosemide
Five minutes after a stellate ganglion block is performed, a patient becomes restless, then apneic. The most likely cause is
- (A) paratracheal hematoma
- (B) phrenic nerve block
- (C) recurrent laryngeal nerve block
- (D) subarachnoid injection
- (E) vertebral artery injection