Surgery is cancelled 10 minutes after initiation of intravenous regional anesthesia with 50 ml of lidocaine 0.5%. To terminate anesthesia safely, what is the most appropriate timing for deflating the tourniquet?
(A) Immediately if benzodiazepines have been administered
(B) Immediately after intravenous administration of ephedrine 10 mg
(C) Immediately, followed by repeated reinflation and deflation
(D) In no less than 20 minutes after initial injection
(E) In no less than 45 minutes after initial injection
Which of the following phenomena is primarily responsible for the decrease in core body temperature that commonly occurs during the first hour of general anesthesia?
(A) Convective heat loss from cutaneous vasodilation
(B) Decreased heat production
(C) Evaporative heat loss during skin preparation
(D) Heat loss from the respiratory tract
(E) Redistribution of core body heat to the periphery
Which of the following changes in pulmonary function best explains the more rapid rate of rise of alveolar concentration of volatile anesthetics in pregnant women than in nonpregnant women?