10 Random Questions
Which of the following is the most common cause of peroneal nerve damage?
- (A) Crossed legs in the supine position
- (B) Lateral decubitus position
- (C) Prone position
- (D) Reverse Trendelenburg position
- (E) Improper placement of a pelvic retractor
The low fetal/maternal plasma ratio of bupivacaine compared with lidocaine is due to
- (A) fetal tissue binding
- (B) fetal plasma protein binding
- (C) maternal plasma protein binding
- (D) ionization in maternal blood
- (E) ionization in fetal blood
A 40-year-old woman is undergoing a posterior fossa craniotomy in the sitting position for clipping of a basilar artery aneurysm. Nitroprusside is being used to maintain mean arterial pressure at 50 mmHg, measured at head level. During dissection, over the course of one minute, the mean blood pressure decreases to 30 mmHg. Simultaneously, end-tidal carbon dioxide and pulmonary artery pressures decrease and heart rate increases. The most likely cause of these changes is
- (A) progressive hypoxemia
- (B) nitroprusside bolus
- (C) junctional rhythm
- (D) brain stem manipulation
- (E) venous air embolism
Each of the following conditions is a complication of mediastinoscopy EXCEPT
- (A) air embolism
- (B) hemorrhage
- (C) injury to the left recurrent laryngeal nerve
- (D) occlusion of the left carotid artery
- (E) tension pneumothorax
A 7-year-old, obese, 30-kg boy was anesthetized using an adult circle system containing a 3-liter bag and mask. Induction with nitrous oxide (2 liters), oxygen (1 liter), and enflurane 3% was characterized by three minutes of hyperventilation followed by apnea. Forty-five seconds later, the child moved and became difficult to control. The most likely cause of the movement is
- (A) decreased alveolar concentration of enflurane during the period of apnea
- (B) excessive uptake of enflurane by the child's fat
- (C) higher fresh gas flows required with use of an adult circle system in a child
- (D) convulsions induced by enflurane
- (E) hypoxia developing during the period of apnea
Cerebral blood flow is decreased by
- (A) chronic respiratory acidosis
- (B) hypoxia
- (C) hypoglycemia
- (D) polycythemia
- (E) the postictal state
A 70-kg patient with no acute bleeding has a preoperative platelet count of 40,000/mm3. Following preoperative transfusion of platelets 10 units, the predicted platelet count would be
- (A) 50,000/mm3
- (B) 80,000/mm3
- (C) 90,000/mm3
- (D) 140,000/mm3
- (E) 190,000/mm3
A patient with a fasting blood glucose concentration of 100 mg/dl undergoes a four-hour operation under general anesthesia without intraoperative administration of glucose. On emergence the most likely finding will be
- (A) marked hypoglycemia
- (B) mild hypoglycemia
- (C) normoglycemia
- (D) mild hyperglycemia
- (E) marked hyperglycemia
The following breath sounds are heard after placement of a left-sided double-lumen endobronchial tube. The most likely cause of these findings is
- (A) presence of both lumens in the right mainstem bronchus
- (B) presence of both lumens in the left mainstem bronchus
- (C) presence of both lumens in the trachea
- (D) herniation of the bronchial cuff at the bifurcation of the trachea
- (E) presence of the bronchial lumen in the right mainstem bronchus
An 87-kg 64-year-old woman in good general health is undergoing a right knee arthroplasty while in the supine position with general anesthesia consisting of enflurane 2% and nitrous oxide 50% in oxygen. She is breathing spontaneously through a 7-mm endotracheal tube. During the first 30 minutes of the procedure, the arterial oxygen saturation measured by pulse oximetry decreases from 98% to 92%. The most likely cause of the desaturation is
- (A) decreased functional residual capacity
- (B) diffusion hypoxia
- (C) hypercarbia
- (D) increased airway resistance produced by the endotracheal tube
- (E) inhibition of hypoxic pulmonary vasoconstriction