A 26-year-old patient with multiple trauma is admitted to the intensive care unit postoperatively. The early development of polyuria, hypotension, low urine sodium excretion, high serum osmolality, and normal serum creatinine concentration is best explained by
A 37-year-old woman with pregnancy-induced hypertension develops oliguria two hours after cesarean delivery during epidural .anesthesia. Despite infusion of 2000 mL of crystalloid solution, urine output remains 10 mL/hr. Which of the following laboratory findings is most suggestive of acute tubular necrosis?
(A) Blood urea nitrogen level of 30 mg/dL
(B) Serum creatinine level of 1.2 mg/dL
(C) Urinary/plasma osmolality of 1:1
(D) Urinary sodium level of 10 mEq/L
(E) Urinary specific gravity of 1.024
C
One day after a vaginal hysterectomy under epidural anesthesia, a patient has numbness and inability to dorsiflex the right foot. Her legs were placed in leg holders during the operation. The most likely cause is
A programmable DVI pacemaker can be inhibited or inactivated by each of the following EXCEPT
(A) myopotentials from shivering
(B) succinylcholine-induced fasciculations
(C) the ventricular R wave
(D) the atrial P wave
(E) placement of a magnet over it
D
In a patient with adult respiratory distress syndrome who is being mechanically ventilated, which of the following findings indicates the most severe disease?
(A) Decreased functional residual capacity
(B) Decreased lung compliance
(C) Hypercarbia
(D) Hypoxemia
(E) Increased dead space
C
Which of the following statements about thiopental is true?
(A) Rapid uptake into maternal tissues limits its transfer to the fetus
(B) Its short duration of action is due to its extensive binding to plasma proteins
(C) Accumulation in fat leads to acute tolerance
(D) Alkalinity of solution causes respiratory depression
(E) Uptake into brain is slowed by respiratory acidosis