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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

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BuyFindarrow_forward

Cardiopulmonary Anatomy & Physiolo...

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

Vertex shape waves often appear toward the end of which of the following sleep stages?

A. Stage N1 non-REM sleep

B. Stage N2 non-REM sleep

C. Stage N3 non-REM sleep

D. REM sleep

Summary Introduction

Introduction:

The electroencephalogram (EEG) is a test that is used to measure electrical activity in the brain. The activity is measured by the brain wave’s frequency, amplitude, and polarity. The vertex waves are high-amplitude, V-shaped waves that show upward deflection in EEG. Their amplitude may be greater than 20 µV.

Explanation

Justification/ Explanation for the correct answer:

Option (a) is, ‘stage N1 non-REM sleep’. The stage N1 non-REM (non-rapid-eye-movement) sleep is marked by high activity of the brain in a relaxed state. Vertex waves are V-shaped waves observed in the end stage of N1 non-REM sleep and this indicates the start of the N-2 stage. Hence, option (a) is correct.

Explanation for the incorrect answers:

Option (b) is, ‘N2 non-REM sleep’. The major brain waves observed during this stage are theta waves, sleep spindles and K-complexes. The vertex waves are also observed but only during the initial stages of N2 sleep and are much rare in the end of stages...

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