Lectures 7 and - Normal Sinus Rhythm vs Normal Sinus Arrhythmia

4 important questions on Lectures 7 and - Normal Sinus Rhythm vs Normal Sinus Arrhythmia

What is a normal sinus rhythm?

Rhythm that arises from the sinus node and conducts normally down through the ventricles
- P waves in front of every QRS complex
- Constant PR interval
- P wave positive in lead II

What is sinus arrhythmia?

Sinus rhythm with rate changing coincident with respiration = NORMAL

How does sinus arrhythmia happen?

Hering-Breuer reflex: Stretch receptors in lungs influence vagal innervation of the sinus node
- Inspiration = increase in HR
- Expiration = decrease in HR
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How do we diagnose normal ECG and arrhythmia?

Ask the following questions
  1. Are all 5 waves present?
  2. RR interval (too close = tachycardia, too far = bradycardia)
  3. Consistent intervals between waves?
  4. Association/correlation between P and QRS complex?

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