A healthy 60-kg 52-year-old woman undergoing reduction mammoplasty is anesthetized with isoflurane and oxygen, and deliberate hypotension to 80/40 mmHg is induced with nitroprusside. Urine output through an indwelling urethral catheter has been 10 mL during the past hour. You should now
(A) administer furosemide 40 mg intravenously
(B) infuse normal saline solution until urine output reaches 35 mL/hr
(C) administer dopamine at 3 mcg/kg/min
(D) expect normal urine flow with restoration of normal blood pressure
Six months after repair of a lacerated peroneal nerve, a patient has electric-shock-like pain when pressure is applied to the middle of the gastrocnemius muscle. The most appropriate initial management is
A patient receiving mechanical ventilation with oxygen 60% postoperatively has a PaO2 of 160 mmHg and a PaCO2 of 38 mmHg. One hour later, with mechanical ventilation unchanged, the PaO2 is 150 mmHg and PaCO2 is 48 mmHg. The most likely cause of these changes is
During an inguinal hernia repair, a newborn infant will have a larger fluid requirement (in milliliters per kilogram) than an adult because of relatively greater