HLSC 4412U Lecture Notes - Lecture 1: Atrial Fibrillation, Qrs Complex, Pr Interval

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24 Jun 2018

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1. Identify and examine the P waves –normal – present and upright if upside down could

mean that the person has an arrhythmia – no noticeable P wave = atrial fibrillation

2. Measure the PR interval – distance between the beginning of the P wave to the

beginning of the QRS complex. PRI – 0.12 - 0.20 secs

3. Measure the QRS complex – 0.06 – 0.12

4. Identifying the rhythm – regular or irregular – measure distance between Rs

5. Determine the heart rate – 6 second method – count number of Rs and multiply by 10 –

works best for irregular rhythm

a. Big box method – 300 divided by the number of big boxes between 2 R’s - works

better for regular heart rhythms (and if you don’t have the 6 second method

lines)

6. Interpret strip

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