10 Random Questions
Each of the following conditions is associated with upregulation of the acetylcholine receptor at the neuromuscular junction EXCEPT
- (A) burn injuries
- (B) myasthenia gravis
- (C) prolonged bed rest
- (D) prolonged use of neuromuscular relaxants
- (E) upper motor neuron injury
During direct intra-arterial measurement of blood pressure
- (A) the mean arterial pressure will be unaffected by small air bubbles in the system
- (B) an underdamped system will overestimate the mean arterial pressure
- (C) an underdamped system will overestimate the diastolic pressure
- (D) long tubing from the catheter to the transducer will tend to decrease resonance in the system
- (E) calibration of the transducer by opening a stopcock to air at the sternal angle will overestimate the mean
Which of the following statements regarding innervation of the upper extremity is true?
- (A) Blockade of the radial nerve decreases the patient's ability to spread the fingers apart
- (B) The brachial plexus receives preganglionic sympathetic fibers arising from C5 through T2
- (C) Interscalene injection of the brachial plexus at C6 is likely to spare the axillary nerve.
- (D) The musculocutaneous nerves receive contributions from C5 and C6
- (E) The vertebral artery lies posterior to the nerve roots of the brachial plexus
Prolonged respiratory depression following administration of morphine is more likely in patients with chronic renal faillure than in patients with normal kidney function because of
- (A) decreased biotransformation
- (B) decreased protein binding
- (C) decreased volume of distribution
- (D) delayed excretion of morphine metabolites
- (E) the effect of acidosis on morphine ionization
The cardiac rhythm illustrated appeared suddenly in an anesthetized patient. The most appropriate management is
- (A) administration of adenosine
- (B) administration of digoxin
- (C) administration of epinepherine
- (D) overdrive pacing
- (E) synchronous cardioversion
Prompt control of seizures induced by bupivacaine is necessary because
- (A) cerebral metabolic rate for oxygen increases more than cerebral blood flow
- (B) cerebral blood flow is increased
- (C) bupivacaine decreases aerobic cerebral metabolism
- (D) cardiac failure may occur
- (E) ventilation may be impaired
Uterine blood flow is
- (A) autoregulated in normal unanesthetized parturients
- (B) decreased by the addition of epinephrine 1:200,000 to lidocaine administered epidurally
- (C) decreased by intravenous infusion of ritodrine in unanesthetized parturients
- (D) increased by administration of magnesium sulfate to patients with preeclampsia
- (E) unchanged after paracervical injection of lidocaine without epinephrine
Which of the following physiologic changes occurs with immersion in water during extracorporeal shock wave lithotripsy?
- (A) Decreased cardiac output
- (B) Decreased central venous pressure
- (C) Increased expiratory reserve volume
- (D) Increased functional residual capacity
- (E) Increased stroke volume
A patient is undergoing exploration of a stab wound to the left side of the neck. On awake laryngoscopy, the left vocal cord is in midposition and the right vocal cord is abducted during inspiration. The most likely cause of these findings is trauma to which of the following structures on the left?
- (A) C7-8 nerve root
- (B) Stellate ganglion
- (C) Glossopharyngeal nerve
- (D) Superior laryngeal nerve
- (E) Vagus nerve
Preoperative evaluation of a patient who has marked malnutrition will demonstrate each of the following EXCEPT
- (A) decreased respiratory muscle function
- (B) decreased serum albumin concentration
- (C) decreased metabolic rate
- (D) suppressed immune function
- (E) decreased extracellular fluid volume