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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

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Section
BuyFindarrow_forward

Cardiopulmonary Anatomy & Physiolo...

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

The imaginary line that can be drawn between the positive and negative electrodes in leads I, II, and III is called the

A. Axis

B. Vector

C. Equiphasic line

D. Baseline

Summary Introduction

Introduction:

The electrical activities of the heart are monitored by electrocardiogram that uses a system of leads, which are positive or negative electrodes. The leads are of two types, depending upon their activity, unipolar and bipolar. 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. The bipolar leads consist of two electrodes, one is positive and the other is negative. The standard unipolar leads are aVL, aVR, aVF, V1, V2, V3, V4, V5 and V6 while the bipolar leads are lead I, lead II and lead III.

Explanation

Justification/ Explanation for the correct answer:

Option (a) is axis. The imaginary lines that can be drawn between the positive and negative electrode in the leads I, II and III are called axis. The axis connects all three leads and results in the formation of a triangle around the heart called Einthoven’s triangle. The three leads are all bipolar leads and consist of two electrodes, one positive and one negative. Hence, option (a) is correct.

The explanation for the incorrect answers:

Option (b) is vector...

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