A 50-year-old woman notes loss of sensation in the medial lower leg 24 hours after vaginal hysterectomy in the lithotomy position. Which of the following nerves is most likely to be injured?
(A) Lateral femoral cutaneous
(B) Obturator
(C) Peroneal
(D) Saphenous
(E) Tibial
D
The alveolar concentrations of anesthetics increase more rapidly in children than in adults because of a greater
(A) blood volume (per kg body mass)
(B) cardiac index
(C) MAC
(D) ratio of alveolar ventilation to functional residual capacity
A decreased dose of sodium thiopental is administered to patients in hypovolemic shock primarily because
(A) acidosis increases the fraction of unionized drug
(B) delivery of the drug to the brain is increased
(C) hepatic clearance is decreased
(D) thiopental is a myocardial depressant
(E) thiopental is a venous dilator
E
A 70-year-old patient has absence of the left radial pulse one month after repair of an aortic aneurysm. Arterial pressure was monitored perioperatively with a 20-gauge left radial artery catheter. Which of the following statements concerning this complication is true?
(A) A preoperative Allen's test would have predicted this complication
(B) Stellate ganglion block should be performed
(C) This complication would have been less likely with an 18-gauge catheter
(D) This patient has poor collateral circulation in the hand
(E) The pulse will likely return
E
The acute onset of hypotension without a decrease in mixed venous oxygen saturation is most likely associated with the onset of
Evaluation of a postoperative neurologic deficit discloses inability to oppose the thumb and little finger, weakness of abduction of the thumb, and loss of flexion of the distal phalanx of the index finger. This problem is most likely related to
(A) paresthesia occurring during an interscalene brachial plexus block
(B) attempted radial artery cannulation at the wrist
(C) inadequate padding under the elbow
(D) attempted venipuncture in the antecubital fossa
(E) abduction of the upper humerus against an "ether screen"