Cardio HW 2 49-80 Flashcards
Under normal conditions, the strength of cardiac contraction is regulated by: Choose one answer. A. the heart rate. B. the nervous system. C. physical exertion. D. the Frank-Starling mechanism.
B
Unlike an idioventricular rhythm, an agonal rhythm:
Choose one answer.
A. is associated with a faster rate.
B. does not produce a palpable pulse.
C. is associated with a lower mortality rate.
D. indicates a regular ventricular pacemaker.
B
Unlike the parasympathetic nervous system, the sympathetic nervous system:
Choose one answer.
A. is not under the direct control of the autonomic nervous system.
B. provides a mechanism for the body to adapt to changing demands.
C. is blocked when drugs such as atropine are administered.
D. constricts the pupils and increases gastrointestinal function when stimulated.
B
Untreated ventricular tachycardia would MOST likely deteriorate to: Choose one answer. A. asystole. B. torsade de pointes. C. ventricular fibrillation. D. pulseless electrical activity.
C
Vasoconstriction occurs following stimulation of: Choose one answer. A. beta-1 receptors. B. beta-2 receptors. C. alpha receptors. D. alpha and beta receptors.
C
Ventricular bigeminy occurs when:
Choose one answer.
A. two premature ventricular complexes (PVCs) occur in a row.
B. every second complex is a PVC.
C. at least two differently shaped PVCs occur.
D. a 6-second strip contains at least two PVCs.
B
Ventricular fibrillation occurs when:
Choose one answer.
A. the ventricles quiver rather than contract normally, while organized atrial contractions continue as normal.
B. the ventricles become the primary pacemaker for the heart, resulting in a rapid and irregular ventricular rhythm.
C. many different cells in the heart depolarize independently rather than in response to an impulse from the SA node.
D. cardiac cells in the ventricles fail to completely repolarize, resulting in a decrease in ventricular automaticity.
C
What is the approximate maximum dose of lidocaine for a 200-pound patient? Choose one answer. A. 275 mg B. 300 mg C. 325 mg D. 350 mg
A
What is the MOST appropriate sequence of treatment for a patient with a suspected acute myocardial infarction?
Choose one answer.
A. Oxygen, aspirin, nitroglycerin, morphine
B. Oxygen, nitroglycerin, aspirin, morphine
C. Aspirin, nitroglycerin, oxygen, morphine
D. Morphine, oxygen, aspirin, nitroglycerin
A
What is the R-on-T phenomenon?
Choose one answer.
A. A premature ventricular complex (PVC) that occurs when the ventricles are not fully repolarized
B. When the R wave occurs at the J point of the next cardiac cycle
C. A unifocal PVC that occurs during the upslope of any given T wave
D. A PVC that occurs during a time when the ventricles are depolarizing
A
What physiologic effect occurs within the first 5 to 10 minutes after administering furosemide (Lasix)?
Choose one answer.
A. Increased preload
B. Peripheral venous pooling
C. Excretion of water by the kidneys
D. Increase in cardiac afterload
B
What prevents the backflow of blood during ventricular contraction? Choose one answer. A. The aortic valve B. Semilunar valves C. The pulmonic valve D. AV valves
D
When administering aspirin to a patient with an acute coronary syndrome, you should:
Choose one answer.
A. first check to make sure the patient is not severely hypertensive.
B. administer half the usual dose if the patient has a history of stroke.
C. have him or her chew and swallow 160 to 325 mg of baby aspirin.
D. give up to 325 mg of enteric-coated aspirin for the patient to swallow.
C
When analyzing a cardiac rhythm strip in lead II, you should routinely evaluate all of the following components, EXCEPT the: Choose one answer. A. QRS width. B. PR interval. C. ST segment. D. R-R interval.
C
Which of the following actions should NOT occur while CPR is in progress? Choose one answer. A. Advanced airway placement B. Cardiac rhythm assessment C. Assessment for a palpable pulse D. Establishment of vascular access
C
