Following maternal epidural injection, fetal exposure to chloroprocaine is lower than fetal exposure to bupivacaine for which of the following reasons?
Which of the following is described by the standard deviation during analysis of the results of a clinical study?
A 58-year-old man with a history of angina is undergoing resection of an abdominal aortic aneurysm under morphine, nitrous oxide, d-tubocurarine anesthesia. Just before removal of the aortic cross-clamp, heart rate is 74 bpm, blood pressure is 115/70 mmHg, and pulmonary artery occlusion pressure is 7 mmHg. Immediately after removal of the cross-clamp, heart rate increases to 120 bpm, blood pressure decreases to 80/55 mmHg, and pulmonary artery occlusion pressure decreases to 3 mmHg. The V5 lead on the EKG demonstrates sudden ST-segment depression and T-wave inversion. Initial therapy should be
An obese patient and a lean patient receive halothane for the same duration and at the same inspired tension. Postoperatively, the obese patient would demonstrate
A healthy, spontaneously breathing, supine, anesthetized patient has a PaCO2 to PetCO2 difference of 3 mmHg. Following institution of mechanical ventilation the value increases to 12 mmHg. The most likely cause of this change is
Each of the following conditions is a complication of mediastinoscopy EXCEPT
Normal pregnancy is associated with a decrease in each of the following EXCEPT
For 30 minutes, a patient has been receiving oxygen 2 L, nitrous oxide 2 L, and halothane from an agent-specific vaporizer set at 1%. A mass spectrometer sampling gas from the patient's airway shows an end-tidal halothane concentration of 0.7%. The most likely explanation for this difference is
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
A 5-year-old child undergoes strabismus correction during spontaneous ventilation with halothane 1.5%, nitrous oxide and oxygen 50%. Intravenous atropine 0.2 mg is administered after inhalation induction. Ten minutes after incision, heart rate decreases from 110 bpm to 40 bpm. Which of the following is the most likely cause?