10 Random Questions
The induction dose of thiopental should be decreased in each of the following situations EXCEPT
- (A) age greater than 70 years
- (B) cardiogenic shock
- (C) decreased hepatic blood flow
- (D) hypoalbuminemia
- (E) hypothyroidism
A 20-year-old man with a history of substance abuse is undergoing preoperative evaluation. Which of the following findings suggests current use of cocaine?
- (A) Absence of deep tendon reflexes
- (B) Bradycardia
- (C) Hypertension
- (D) Hypothermia
- (E) Pinpoint pupils
A 69-year-old man is confused and agitated one hour after preoperative intramuscular administration of scopolamine for awake fiberoptic laryngoscopy. SpO2 measured by pulse oximetry is 97%. Which of the following drugs is most appropriate for treatment of the change in mental status?
- (A) Fentanyl
- (B) Flumazenil
- (C) Midazolam
- (D) Neostigmine
- (E) Physostigmine
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
- (A) compression of the sciatic nerve
- (B) compression of the common peroneal nerve
- (C) injury of the nerve root at L4-5
- (D) stretching of the femoral nerve
- (E) stretching of the tibial nerve
A 68-year-old man with stable angina treated with propranolol and nifedipine is scheduled for coronary artery bypass grafting. After induction with fentanyl and tracheal intubation, heart rate decreases to 40 bpm and blood pressure decreases to 70/40 mmHg. The ECG is shown. Which of the following is the most appropriate first step in management?
- (A) Infusion of isoproterenol
- (B) Administration of phenylephrine
- (C) Closed chest cardiopulmonary resuscitation
- (D) Defibrillation
- (E) Synchronized cardioversion
Ten minutes after induction of anesthesia with thiopental and isoflurane but before incision, a patient's nasopharyngeal temperature has decreased to 35.4°C. Which of the following contributed most to this decrease in temperature?
- (A) Anesthesia-induced block of nonshivering thermogenesis
- (B) Failure to use a warming blanket
- (C) Infusion of room-temperature crystalloid
- (D) Inhalation of room-temperature gases
- (E) Mixing of peripheral and central blood
When using apneic oxygenation during endoscopy in a normothermic patient, PaC02
- (A) increases at a rate inversely proportional to oxygen flow rate
- (B) increases at a rate of 8 + 0.5 mmHg per minute
- (C) increases at the same rate that Pa02 decreases
- (D) equals mixed venous PC02 after one minute
- (E) is increased by airway obstruction
A 55-year-old man who is scheduled to undergo carotid endarterectomy (CEA) has a persistent myocardial filling defect at three hours on a dipyridamole-thallium scan. Which of the following statements is correct?
- (A) Coronary autoregulation is effective in this segment
- (B) Coronary revascularization should precede CEA
- (C) Isoflurane is contraindicated
- (D) Myocardial infarction is impending
- (E) There is a segment of nonviable myocardium
Arterial pressure in the radial artery is 155/70 mmHg measured by a correctly calibrated catheter-transducer system. At the same time aortic pressure is 140/75 mmHg using a high-fidelity catheter tip transducer. The most likely cause of this discrepancy is
- (A) a large amount of air in the dome of the radial artery transducer
- (B) coarctation of the aorta
- (C) peripheral vascular constriction produced by sympathetic stimulation
- (D) physiologic amplification of the wave form from the aorta to the radial artery
- (E) too high a frequency response in the catheter-transducer system
The drug that causes dose-dependent EEG evidence of both central nervous system excitation and depression is
- (A) lidocaine
- (B) halothane
- (C) thiopental
- (D) nitrous oxide
- (E) midazolam