Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909



Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909
Textbook Problem

Which of the following monitor the electrical activity of the heart in the frontal plane?

1. aVL

2. Lead II

3. aVR

4. Lead III

5. aVF

A. 1 and 3 only

B. 1, 4, and 5 only

C. 2,3,4 and 5 only

D. 1,2,3,4 and 5

Summary Introduction


The system of leads in an electrocardiogram monitors the electrical activities of the heart. The leads are both unipolar and bipolar. The unipolar leads consist of one electrode at one end and one neutral electrode. These leads monitor the electrical activity between the positive electrode and the reference point at the center of the heart, which has zero electrical references. The bipolar leads consist of positive and negative electrodes. The frontal plane activity is monitored by the limb leads. The frontal plane activity involves the flow of electrical waves over the anterior surface of the heart.


Justification/ Explanation for the correct answer:

Option (d) is 1, 2, 3, 4, and 5. The leads that are involved in the monitoring of frontal plane activity of the heart consist of both unipolar and bipolar leads. The leads I, II and III are the bipolar leads while aVR, aVL, and aVF are the unipolar leads. The AV here denotes the augmented ventricles and the R is referring right arm, L is referring left arm and aVF is the lead of left leg. Hence, the option (d) is correct.

The explanation for the incorrect answers:

Option (a) is 1 and 3 only. The aVL and lead II only are not involved in this process. The other leads such as aVR, aVF, lead I and lead III are also involved in the process, are the limb leads...

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