Which of the following findings necessitates the preoperative insertion of a ventricular pacemaker in a 48-year-old man scheduled to undergo cholecystectomy?
(A) Atrial flutter with 3:1 atrioventricular block
(B) Bifascicular (right bundle branch block and left anterior hemiblock) block
(C) Left bundle branch block with first-degree atrioventricular block
An oxygen-driven anesthesia ventilator with a bellows that ascends during exhalation develops a small hole in the bellows. Which of the following is the most likely effect?
(A) Alveolar hyperinflation
(B) Decreased inspiratory flow rate
(C) Decreased inspired oxygen concentration
(D) Increased concentration of inhalational agent
(E) Rebreathing of exhaled gases
A
The recommended agent for decontamination of anesthetic equipment splattered with blood containing HIV is
(A) household bleach
(B) hydrogen peroxide
(C) iodine solution
(D) isopropyl alcohol
(E) Lysol solution
A
Pain and spasm due to injury of the deltoid muscle is most effectively relieved by
(A) axillary block
(B) cervical sympathetic block
(C) interscalene brachial plexus block
(D) paravertebral block at C4
(E) superficial cervical plexus block
C
Cholinergic receptor blockade
(A) decreases intraocular pressure
(B) decreases lower esophageal sphincter tone
(C) increases gastrointestinal motility
(D) induces diaphoresis
(E) produces copious secretions
B
When performed with identical doses, which of the following types of regional block is associated with the highest plasma concentration of the drug?
Four hours after open cholecystectomy, a patient who is breathing spontaneously has an SpO2 of 93% in the supine position and an SpO2 of 98% when placed in the head-up position. The most likely cause of this change is an increase in which of the following?
A 25-year-old woman is admitted to the hospital in the early stages of labor at term. Initial hematocrit is 33%. Which of the following is the most likely cause of the hematocrit value?