An isoflurane-specific vaporizer that is 25% full is mistakenly refilled with halothane, and the dial is set at 1.5%. Which of the following statements concerning this situation is true?
(A) The gas mixture will contain equal partial pressures of halothane and isoflurane
(B) The gas mixture will produce a greater depth of anesthesia than 1.5% isoflurane alone
(C) The gas mixture will produce a greater depth of anesthesia than 1.5% halothane alone
(D) The liquid mixture will have a higher vapor pressure than 1.5% halothane alone
(E) The liquid mixture will have a higher vapor pressure if it is placed in a halothane-specific vaporizer
A 20-kg, 6-year-old boy is undergoing strabismus surgery under anesthesia with sevoflurane, nitrous oxide, and oxygen. The heart rate suddenly decreases from 85 to 40 bpm. Which of the following is the most appropriate first step in management?
Arterial oxyhemoglobin desaturation develops more rapidly following apnea in a pregnant patient at term than in a nonpregnant patient with a large intra-abdominal tumor. Which of the following findings in pregnancy is the most likely cause?
During an aortic aneurysm repair, end-tidal carbon dioxide tension decreases from 35 to 20 mmHg in three breaths. The most likely cause is
(A) acute arteriovenous fistula
(B) bronchospasm
(C) decreased cardiac output
(D) increased tidal volume
(E) venous air embolism
C
A 24-year-old woman with abruptio placentae at 38 weeks' gestation has bleeding at the site of the intravenous catheter. Which of the following is the most likely cause?
(A) Diffuse vasculitis
(B) Disseminated intravascular coagulation
(C) Isolated factor VIII deficiency
(D) Primary fibrinolysis
(E) Vitamin K deficiency
B
An EKG shows ventricular tachycardia in a patient with a heart rate of 160 bpm and a blood pressure of 90/60 mmHg. The best initial therapeutic maneuver prior to cardioversion is
Following extubation after nasotracheal intubation for seven days, a 35-year-old man has fever, facial pain, nasal stuffiness, and purulent nasal secretions. The most likely cause is