10 Random Questions
A 62-year-old woman with obesity and type II diabetes mellitus is scheduled to undergo vitrectomy of the right eye. Five minutes after retrobulbar injection with 0.75% bupivacaine 4 ml and intravenous administration of fentanyl 50 ju-g and midazolam 1 mg, she is apneic and unresponsive. Which of the following is the most likely cause?
- (A) Fentanyl-midazolam interaction
- (B) Hypoglycemia
- (C) Intravenous bupivacaine
- (D) Retrobulbar hematoma
- (E) Subarachnoid bupivacaine
Which of the following factors causes a decrease in mixed venous oxygen saturation?
- (A) Arteriovenous fistula
- (B) Decreased hemoglobin concentration
- (C) Decreased oxygen consumption
- (D) Increased cardiac output
- (E) Nitroprusside toxicity
Following a vaginal hysterectomy in the lithotomy position under general anesthesia, a patient has numbness of the lateral aspect of the left calf and medial half of the dorsum of the left foot. On physical examination she has footdrop and the toes cannot be extended. Which nerve is most likely to be involved?
- (A) Common peroneal nerve
- (B) Deep peroneal nerve
- (C) Posterior tibial nerve
- (D) Saphenous nerve
- (E) Sciatic nerve
When compared with a healthy 30-year-old man, which of the following respiratory parameters is decreased in an otherwise healthy 80-year-old man?
- (A) Alveolar to arterial oxygen gradient
- (B) Lung compliance
- (C) Ratio of functional residual capacity to total lung capacity
- (D) Resting tidal volume
- (E) Ventilatory response to carbon dioxide
Which of the following relationships is indicated by the curve illustrated in the graph shown?
- (A) Intracranial blood volume (X) and intracranial pressure (Y)
- (B) PaCO2 (X) and minute ventilation (Y)
- (C) PaO2 (X) and hemoglobin saturation (Y)
- (D) Preload (X) and stroke volume (Y)
- (E) Systemic arterial pressure (X) and cerebral blood flow (Y)
Which of the following provides the most definitive diagnosis in a patient with suspected brain death?
- (A) Absent bilateral somatosensory evoked potentials
- (B) Absent cerebral blood flow during four-vessel contrast cerebral arteriography
- (C) Intracranial pressure greater than mean arterial pressure
- (D) Score of zero on Glasgow Coma Scale
- (E) Two isoelectric electroencephalograms
A 25-year-old woman undergoes a difficult open cholecystectomy during anesthesia with isoflurane, nitrous oxide, fentanyl, and vecuronium. Five units of blood are administered intraoperatively. Two days later, the patient has mildly increased serum transaminase concentrations and markedly increased alkaline phosphatase and direct bilirubin concentrations. Which of the following is the most likely cause?
- (A) Acute viral hepatitis
- (B) Hemolysis
- (C) Isoflurane-induced liver dysfunction
- (D) Retained common duct stone
- (E) Sepsis
Which of the following is the most common cause of peroneal nerve damage?
- (A) Crossed legs in the supine position
- (B) Lateral decubitus position
- (C) Prone position
- (D) Reverse Trendelenburg position
- (E) Improper placement of a pelvic retractor
Which of the following is most likely in a 30-year-old patient with untreated hypothyroidism?
- (A) Cardiac arrhythmias with ketamine administration
- (B) Decreased ventilatory response to hypoxia
- (C) Hypoglycemia
- (D) Increased MAC of inhalational anesthetics
- (E) Peripheral vasodilatation
At the end of an anesthetic in which a nondepolarizing muscle relaxant was administered, the least number of receptors are blocked
- (A) after administration of neostigmine 5 mg and glycopyrrolate 1 mg
- (B) if the tetanus is sustained at 30 Hz
- (C) if the patient can sustain head lift for 5 sec
- (D) when the ratio of twitch height T1:T4 is 0.8
- (E) when tidal volume is normal