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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

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Chapter
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BuyFindarrow_forward

Cardiopulmonary Anatomy & Physiolo...

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

The normal duration of the T wave is

A. 0.05 second or less

B. 0.10 second or less

C. 0.15 second or less

D. 0.20 second or less

Summary Introduction

Introduction:

The electrical activities of the heart are recorded using a technique called electrocardiography. An electrocardiograph in the form of waves, intervals, and segments records the electrical activity of the heart on a specific paper that runs with the same speed as the electrocardiograph machine. The graphical representation is called the electrocardiogram (ECG). The ECG involves a system of 12-leads that view different regions of the heart. The waves are P wave and T wave, the segments include the PR segment and the ST segment, and a QRS complex.

Explanation

Justification/ Explanation for the correct answer:

Option (d) is, ‘0.20 seconds or less.’ The T wave represents the rest, repolarization, and recovery of the ventricles. The normal duration of the T wave is 0.20 seconds or less. The T wave usually has a positive deflection, but it may also have a negative deflection. The positive defection is about 0.5 millivolts. Hence, option (d) is correct.

The explanation for the incorrect answers:

Option (a) is, ‘0.05 seconds or less.’ The T wave lasts for 0.20 seconds or less. The T wave is the most easily altered wave and changes to the inverted T wave, or a wave having a low amplitude. The T wave is the indicator of any abnormality in the heart...

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