Sinus Arrhythmia - EKG Reference

Sinus Arrhythmia EKG tracing


Caliper Time Interval: ___ seconds

Key Features

RhythmIrregular, varying with respiration
RateNormal (60-100 bpm) and rate may increase during inspiration
P WaveNormal
PR IntervalNormal (0.12-0.20 sec)
QRSNormal (0.06-0.10 sec)
NotesHeart rate frequently increases with inspiration, decreasing with expiration

Sinus Arrhythmia EKG Reference

Sinus Arrhythmia Definition

Sinus Arrhythmia, is a type of sinus rhythm where the P-P interval varies by greater than 10%. This variation occurs during inspiration and expiration. This is a normal condition and is often more noticeable in children. Non-respiratory arrhythmias can be abnormal and are covered in other pages on this website.

Sinus Arrhythmia Causes

Some common causes of abnormal heartbeats are:

  • Heart attack
  • Heart failure
  • Congenital heart disease
  • Abnormal potassium levels
  • Thyroid gland problems
  • Drugs, alcohol or caffeine
  • Medications
  • Nicotine

Sinus Arrhythmia Treatment

Several treatments are available to the clinician for treating arrhythmias. These include:

  • Medications
  • Pacemaker (short-term or longer)
  • Cardiac ablation
  • Implantable cardiac defibrillator

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