Anesthesia Hub -

10 Random Questions

A 67-year-old man undergoes a perineal procedure under epidural anesthesia in the lithotomy position with extreme flexion of the thigh at the hip. No sedatives are used, and the surgery is uneventful. Forty-eight hours later, the patient cannot flex his left knee. Which of the following is the most likely cause?

(A) Epidural hematoma
(B) L5 nerve root injury
(C) Obturator nerve injury
(D) Peroneal nerve injury
(E) Sciatic nerve injury

BASIC Regional & Pain

The fail-safe mechanism on an anesthesia machine is activated by

(A) a wall-oxygen pressure of less than 25 psi
(B) a disconnection between the endotracheal tube and the machine
(C) a nitrous oxide concentration in excess of 85%
(D) an incompetent expiratory valve
(E) no oxygen flow

BASIC Equipment & Physics

Each of the following would be expected in an otherwise healthy 165-kg woman undergoing cholecystectomy EXCEPT

(A) decreased functional residual capacity
(B) decreased ventilatory response to carbon dioxide
(C) increased cardiac output
(D) increased gastric fluid volume
(E) increased metabolism of volatile anesthetics

ADVANCED General

Compared with epidural morphine, intrathecal morphine produces

(A) better relief of visceral pain
(B) greater loss of analgesia after administration of naloxone
(C) less pruritus
(D) less urinary retention
(E) more respiratory depression

ADVANCED Regional & Pain

A patient who is receiving ventilatory support after coronary artery bypass grafting has a PaO2 of 132 mmHg, a PaCO2 of 19 mmHg, and a pH of 7.57. Which of the following is most likely to result from this level of hypocarbia?

(A) Decreased airway resistance
(B) Increased myocardial contractility
(C) Hyperkalemia
(D) Shortened QT interval
(E) Cerebral ischemia

ADVANCED Neuro Cardiac

Which of the following is most effective in decontaminating an anesthesia machine that was splattered with HIV-contaminated blood?

(A) Bleach
(B) Deionized water
(C) Ethylene oxide
(D) Hydrogen peroxide
(E) Isopropyl alcohol

BASIC Equipment & Physics

Which of the following statements concerning isolated mitral stenosis is true?

(A) Afterload reduction increases cardiac output
(B) Pulmonary artery occlusion pressure overestimates left ventricular filling pressure
(C) Pulmonary hypertension is irreversible
(D) Tachycardia decreases the mitral transvalvular gradient
(E) Thermodilution cardiac output measurements are unreliable

ADVANCED Cardiac

During insertion of a Harrington rod with deliberate hypotension for correction of spinal scoliosis, accurate interpretation of somatosensory evoked potentials requires

(A) core temperature greater than 35∞C
(B) hematocrit of at least 25%
(C) mean arterial pressure greater than 70 mmHg
(D) P02 of at least 80 mmHg
(E) reversal of neuromuscular block

Hyperkalemia in response to the administration of an intubating dose of succinylcholine is associated with each of the following disorders EXCEPT

(A) poliomyelitis
(B) multiple sclerosis
(C) hemiplegia
(D) acute cervical cord transection
(E) familial periodic paralysis

ADVANCED Pharmacology & Pharmacokinetics

Each of the following contributes to hypotension following induction of anesthesia with propofol EXCEPT

(A) central vagal stimulation
(B) decreased central sympathetic tone
(C) direct myocardial depression
(D) resetting of arterial baroreceptors
(E) systemic vasodilation