   Chapter 13, Problem 6RQ

Chapter
Section
Textbook Problem

The normal duration of the P wave is no longer thanA. 0.80 secondB. 0.11 secondC. 0.15 secondD. 0.20 second

Summary Introduction

Introduction:

The heart is a myogenic organ and thus, can generate electrical impulses which are responsible for pumping of blood. The electrical activities of the heart are of major clinical significance and a system called electrocardiogram (ECG) is used to monitor the electrical activity of the heart. The ECG uses a characteristic graph paper having a square that denotes a particular time interval and this paper runs at the same speed as the ECG system. The ECG consists of the P wave, QRS complex, T wave, U wave, and QT interval.

Explanation

Justification/ Explanation for the correct answer:

Option (b) is 0.11 second. The duration of the P wave is no longer than 0.11 second. The P wave denotes the depolarization of atria. This wave is generally symmetrical and upright. The sinoatrial node generates the electrical impulse and causes atrial systole. The P wave covers 2 to 2 12 small squares in a row. The normal duration of the P wave is 0.08 to 0.11 seconds, as each small square corresponds to 0.04 seconds in the graph paper. Hence, option (b) is correct.

The explanation for the incorrect answers:

Option (a) is 0.80 second. The duration of the P wave is 0.08 to 0.11 seconds so it is not normal to have 0.80 seconds duration for P wave. The P wave marks the depolarization of atria

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