10 Random Questions
In the event of a leak in the air flowmeter, which flowmeter arrangement produces the lowest risk of delivering hypoxic gas mixtures?
- (A) Air, O2, N2O
- (B) N2O, O2, Air
- (C) N2O, Air, O2
- (D) O2, Air, N2O
- (E) O2, N2O, Air
Neuromuscular blockade of the diaphragm is best ensured by monitoring which of the following peripheral muscles?
- (A) Adductor pollicis muscle
- (B) First dorsal interosseous muscle
- (C) Flexor hallucis muscle
- (D) Muscles of the hypothenar eminence
- (E) Orbicularis oculi muscle
Each of the following improves coagulation in patients with uremia EXCEPT
- (A) conjugated estrogens
- (B) desmopressin
- (C) dialysis
- (D) epsilon-aminocaproic acid
- (E) platelet transfusion
A healthy, but obese, 110-kg woman is scheduled for gastric stapling. Compared with that required at her ideal weight, the dose of thiopental required for anesthetic induction would likely be increased because of changes in
- (A) blood volume
- (B) muscle mass
- (C) circulation time
- (D) body fat
- (E) metabolic rate
After brachial plexus block, a patient has sensation over the inner aspect of the upper arm. Block of which of the following nerves would obtund this sensation?
- (A) Intercostobrachial
- (B) Median
- (C) Musculocutaneous
- (D) Radial
- (E) Ulnar
A patient is scheduled for amputation of the third metatarsal. A tourniquet will not be used during the procedure. The most effective anesthesia will be provided by block of which of the following nerves?
- (A) Femoral
- (B) Common peroneal and tibial
- (C) Sural and deep peroneal
- (D) Sural and tibial
- (E) Tibial, saphenous, and deep peroneal
A patient who is scheduled for emergency laparotomy for bowel obstruction has had oliguria for three hours. She has had hypertension for 10 years. Which of the following laboratory findings would indicate preoperative fluid challenge?
- (A) Urine osmolality: 300 mOsm/L
- (B) Urine specific gravity: 1.015
- (C) Urine sodium concentration: 35 mmol/L
- (D) Fractional excretion of sodium: 0.5
- (E) Ratio of urine-to-plasma creatinine concentrations: 8
Which of the following factors is the major cause of hypotension following release of the infrarenal aortic cross-clamp during aortic reconstruction?
- (A) Abnormal myocardial function
- (B) Decreased systemic vascular resistance
- (C) Down-regulation of adrenergic receptors
- (D) Increased PaCO2
- (E) Suppression of the renin-angiotensin system
Which of the following best explains the decreased effect of hyperventilation on cerebral blood flow when PaCO2 decreases below 20 mmHg?
- (A) Maximal constriction of cerebral vessels
- (B) Decreased cerebral perfusion pressure
- (C) Decreased cerebral metabolic rate for oxygen
- (D) Increased cardiac output
- (E) Increased cerebrospinal fluid pressure
A 70-kg, 20-year-old athlete receives nitrous oxide and oxygen, thiopental, and fentanyl 1.25 mg (25 ml) during a knee reconstruction procedure lasting three hours. Postoperatively, he does not awaken or resume spontaneous breathing for three hours. The most likely explanation for the prolonged effect of fentanyl is
- (A) dose-dependent elimination half-life
- (B) genetically slow biotransformation
- (C) large volume of distribution
- (D) presence of an active metabolite in high concentration
- (E) time required for hepatic elimination