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Lewis's Medical-Surgical Nursing, 11th Edition Chapter 31 - 37 Review Questions Exam Practice Questions and Answers $12.49   Add to cart

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Lewis's Medical-Surgical Nursing, 11th Edition Chapter 31 - 37 Review Questions Exam Practice Questions and Answers

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Lewis's Medical-Surgical Nursing, 11th Edition Chapter 31 - 37 Review Questions Exam Practice Questions and Answers Which aspect of the heart's action does the QRS complex on the ECG represent? Depolarization of the atria Repolarization of the ventricles Depolarization from atrioventricular (...

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  • October 23, 2024
  • 117
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • Lewis Medical Surgical Nursing
  • Lewis Medical Surgical Nursing
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Lewis's Medical-Surgical Nursing, 11th Edition
Chapter 31 - 37 Review Questions Exam Practice
Questions and Answers


Which aspect of the heart's action does the QRS complex on the ECG represent?


Depolarization of the atria


Repolarization of the ventricles


Depolarization from atrioventricular (AV) node throughout ventricles


The length of time it takes for the impulse to travel from the atria to the ventricles - Ans:✔✔-

Depolarization from atrioventricular (AV) node throughout ventricles




Rationale:


The QRS recorded on the ECG represents depolarization from the AV node throughout the ventricles.

The P wave represents depolarization of the atria. The T wave represents repolarization of the ventricles.

The interval between the PR and QRS represents the length of time it takes for the impulse to travel from

the atria to the ventricles.


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The patient tells the nurse that he does not understand how there can be a blockage in the left anterior

descending artery (LAD), but there is damage to the right ventricle. What is the best response by the

nurse?


"One coronary vessel curves around and supplies the entire heart muscle."


"The LAD supplies blood to the left side of the heart and part of the right ventricle."


"The right ventricle is supplied during systole primarily by the right coronary artery."


"It is actually on the right side of the heart, but we call it the left anterior descending vessel." - Ans:✔✔-

"The LAD supplies blood to the left side of the heart and part of the right ventricle."




Rationale:


The best response is explaining that the lower portion of the right ventricle receives blood flow from the

left anterior descending artery as well as the right coronary artery during diastole.


Which anatomic feature of the heart directly stimulates ventricular contractions?


SA node


AV node


Bundle of His


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Purkinje fibers - Ans:✔✔-Purkinje fibers




Rationale:


The Purkinje fibers move the electrical impulse or action potential through the walls of both ventricles

triggering synchronized right and left ventricular contraction. The sinoatrial (SA) node initiates the

electrical impulse that results in atrial contraction. The atrioventricular (AV) node receives the electrical

impulse through internodal pathways. The bundle of His receives the impulse from the AV node.


The nurse is providing care for a patient who has decreased cardiac output due to heart failure. As a

basis for planning care, what should the nurse understand about cardiac output (CO)?


CO is calculated by multiplying the patient's stroke volume by the heart rate.


CO is the average amount of blood ejected during one complete cardiac cycle.


CO is determined by measuring the electrical activity of the heart and the heart rate.


CO is the patient's average resting heart rate multiplied by the mean arterial blood pressure. - Ans:✔✔-

CO is calculated by multiplying the patient's stroke volume by the heart rate.




Rationale:



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Cardiac output is determined by multiplying the patient's stroke volume by heart rate, thus identifying

how much blood is pumped by the heart over a 1-minute period. Electrical activity of the heart and

blood pressure are not direct components of cardiac output.


The nurse is performing an assessment for a patient with fatigue and shortness of breath. Auscultation

reveals a heart murmur. What does this assessment finding indicate?


Increased viscosity of the patient's blood


Turbulent blood flow across a heart valve


Friction between the heart and the myocardium


A deficit in conductivity impairs normal contractility - Ans:✔✔-Turbulent blood flow across a heart valve




Rationale:


Turbulent blood flow across the affected valve results in a murmur. A murmur is not a direct result of

variances in blood viscosity, conductivity, or friction between the heart and myocardium.


A nurse is preparing to teach a group of women in a community volunteer group about heart disease.

What should the nurse include in the teaching plan?


Women are less likely to delay seeking treatment than men.



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