Administration of succinylcholine 1 mg/kg to a pregnant woman rarely causes fetal neuromuscular blockade. Which characteristic of succinylcholine best explains this phenomenon?
To eliminate all pain during the second stage of labor, a lumbar epidural block must extend from
(A) T6 to LI
(B) T10 to LI
(C) T10 to SI
(D) T10 to S4
(E) LI to S5
D
In a patient with sickle cell anemia, which of the following is LEAST likely to trigger sickling?
(A) Hypothermia
(B) Increased systemic vascular resistance
(C) Low central venous pressure
(D) Low mixed venous P02
(E) Metabolic alkalosis
E
A 75-year-old man is confused, restless and disoriented two days after an aortic aneurysm repair. Serum sodium concentration is 112 mEq/L, serum osmolality is low, and urine is hypertonic. The most appropriate treatment is
(A) restriction of fluid intake
(B) administration of isotonic saline solution
(C) administration of hypertonic (3%) saline solution
A 57-year-old man has back pain, a heart rate of 90 bpm, decreased pulse in the left arm, and blood pressure of 200/110 mmHg. During infusion of nitroprusside, heart rate increases to 115 bpm and blood pressure decreases to 140/80 mmHg. The most appropriate management at this time is administration of
In patients with head trauma, which of the following factors results in a return of arterial pH toward normal levels after two days of mechanical hyperventilation?
(A) Decreased renal absorption of hydrogen ions
(B) Decreased renal blood flow
(C) Increased PaCO2 with constant minute ventilation
A 19-year-old woman receives a spinal anesthetic for a repeat cesarean delivery. Two days later she is afebrile but has severe occipital pain that is aggravated by sitting or standing and relieved by lying flat. Associated findings would likely include
A 36-year-old woman who undergoes peritoneal dialysis for chronic renal failure requires emergency surgical exploration for bowel obstruction. Serum creatinine concentration is 9.8 mg/dl and BUN concentration is 124 mg/dl. The most likely abnormality of coagulation is
(A) decreased euglobulin lysis time
(B) decreased platelet count
(C) prolonged activated partial thromboplastin time