   Chapter 13, Problem 4RQ

Chapter
Section
Textbook Problem

Which of the following monitor(s) the left ventricle?1. V12. V23. V34. V55. V6A. 1 onlyB. 5 onlyC. 2 and 3 onlyD. 4 and 5 only

Summary Introduction

Introduction:

The electrocardiogram is a graphical representation of the electrical activities of the heart, recorded over a time period. The standard ECG uses a 12-lead system, where the leads are the electrodes that monitor the electrical activities of the heart. There are four limb leads and six chest leads in the standard 12-lead ECG system. These leads are the unipolar and bipolar type. The unipolar leads monitor the activities of the heart between the positive electrode and the zero-electrical reference point, at the center of the heart, while the bipolar leads contain two electrodes, one positive and one negative. The different leads monitor the activities of the heart at different angles and of specific portions.

Explanation

Justification/ Explanation for the correct answer:

Option (d) is 4 and 5. The left ventricle’s electrical activity is monitored by the V5 and V6 leads. These are the chest or precordial leads. There are a total of six precordial leads of which, the V5 and V6 are known as lateral leads. Hence, the option (d) is correct.

The explanation for the incorrect answers:

Option (a) is 1 only. The V1 lead monitors the right ventricle’s electrical activity along with the V2 lead...

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