10 Random Questions
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?
- (A) Higher cardiac output
- (B) Higher oxygen consumption
- (C) Larger anatomic dead space
- (D) Smaller blood volume
- (E) Smaller functional residual capacity
A 5-month-old infant with tetralogy of Fallot is scheduled for elective inguinal herniorrhaphy. Which of the following would require the operation to be postponed?
- (A) Current propranolol therapy
- (B) Hematocrit of 65%
- (C) History of "tet spells"
- (D) Patent ductus arteriosus
- (E) Room air oxygen saturation of 82%
A 68-year-old woman is scheduled for a mastectomy. She has not taken prescription medications for 24 hours. Preoperative examination shows a heart rate of 104 bpm and blood pressure of 200/105 mmHg. The most likely cause of these findings is omission of which of the following drugs?
- (A) Amiodarone
- (B) Clonidine
- (C) Enalapril
- (D) Hydralazine
- (E) Nifedipine
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
- (A) metabolic acidosis
- (B) pulmonary embolism
- (C) increased body temperature
- (D) interstitial pulmonary edema
- (E) aspiration pneumonia
Which of the following statements concerning diabetes mellitus in pregnancy is true?
- (A) Beta-mimetic tocolytics cause maternal hypoglycemia
- (B) Epidural anesthesia produces hyperglycemia
- (C) Fetal insulin secretion is suppressed
- (D) Maternal insulin does not cross the placenta
- (E) Maternal insulin resistance develops abruptly after delivery
Which of the following statements regarding latex allergy is true?
- (A) Diphenhydramine is the treatment of choice for latex-induced anaphylactic reaction
- (B) Hospital workers are at equal risk as the general population
- (C) It is more common in patients with frequent urethral catheterizations
- (D) Latex gloves can be rinsed free of antigens
- (E) Skin testing should be performed immediately after an acute reaction in the operating room
Which of the following time concentration curves would be expected in arterial blood following intravenous injection of indocyanine green dye in a 3-year-old child with a small ventricular septal defect?
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
- (A) carotid sinus massage
- (B) intravenous administration of bretylium
- (C) intravenous administration of amiodarone
- (D) intravenous administration of propranolol
- (E) precordial "thump"
A pulmonary artery catheter is placed in an awake patient breathing room air. Typical right ventricular and pulmonary artery pressure tracings are obtained. With the catheter balloon inflated, blood drawn from the distal port has a PaO2 of 100 mmHg, while a simultaneous radial artery sample has a PaO2 of 90 mmHg. These data indicate that the
- (A) shunt fraction is greater than 10%
- (B) catheter is in the wedged position
- (C) catheter has entered a pulmonary vein
- (D) cardiac output is abnormally high
- (E) oxygen electrode is malfunctioning
The most likely cause of bilateral fixed and dilated pupils after clipping of a basilar artery aneurysm is
- (A) preoperative administration of atropine
- (B) intraoperative infusion of trimethaphan
- (C) naloxone antagonism of opioid
- (D) persistent hypothermia
- (E) brain stem ischemia