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Author Question: A 50-year-old received trauma to the chest that caused severe impairment of the primary pace-maker ... (Read 110 times)

fnuegbu

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on: Jun 25, 2018
A 50-year-old received trauma to the chest that caused severe impairment of the primary pace-maker cells of the heart. Which of the following areas received the greatest damage?
 
  a. Atrioventricular (AV) node
  b. Sinoatrial (SA) node
  c. Bundle of His
  d. Ventricles

Question 2

A 28-year-old with seizure disorder has a vagus nerve stimulator implanted to help control sei-zure activity. Which result will the nurse expect to occur?
 
  a. Increased speed of cardiac cycle
  b. Increased cardiac contractility
  c. Decreased vasodilation
  d. Decreased cardiac conduction


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Dominic

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Reply #1 on: Jun 25, 2018
Answer to Question 1

ANS: B
The SA node, not the AV node, is considered the pacemaker of the heart. Neither the bundle of His nor the ventricles are involved.

Answer to Question 2

ANS: D
The vagus nerve releases acetylcholine. Acetylcholine causes decreased heart rate and slows conduction through the AV node, thus decreasing the speed of the cardiac cycle. This reaction also decreases contractility but does not cause decreased vasodilation.


fnuegbu

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Reply 2 on: Jun 25, 2018
Great answer, keep it coming :)

parshano

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Reply 3 on: Yesterday
Wow, this really help

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