(B) decreased affinity of maternal hemoglobin for oxygen
(C) decreased maternal and fetal cardiac output
(D) increased placental transfer of oxygen
(E) increased fetal cerebral blood flow
C
A 45-kg, 80-year-old woman undergoes pin fixation of the right hip in the lateral decubitus position under spinal anesthesia. One day after the operation, she cannot move her left ankle or foot actively. The most likely cause is
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
A 19-year-old man is undergoing inguinal herniorrhaphy. He is anesthetized with a spinal block supplemented with midazolam and fentanyl. During the procedure, he has sudden loss of consciousness, profound hypotension, and bradycardia; systolic pressure is 40 mmHg and heart rate is 30 bpm. Cardiopulmonary resuscitation is started. The most appropriate next step is administration of
As part of a preoperative evaluation, a patient had a thallium scan showing a "cold spot" over the left ventricle that occurs with moderate exercise and disappears at rest. This most likely indicates