Overview

Sinus arrhythmia is a cyclic variation on a sinus rhythm of more than 10% or 120ms due to respiratory breathing. Sinus arrhythmia is common (and normal) in children. If the variation occurs independent of respiration in an adult, evaluate for sick sinus syndrome.


Sinus Arrhythmia ECG Features

Look for rhythm that is irregular, varying with respiration, with heart rate that is normal (60-100 bpm) and rate may increase during inspiration. Notice that the P wave is normal. The PR interval is normal (0.12-0.20 sec). The QRS is normal (0.06-0.10 sec).
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 ECG Tracing

Sinus Arrhythmia ECG tracing
electronic calipers for EKG strip





Caliper Time Interval: ___ seconds






More Training Tools - Practice Strips, Tutorial & Quiz

EKG Practice Strips

Users are asked to identify the EKG's using a rhythm strip. Electronic calipers are available. After each answer, immediate feedback and coaching is available.

EKG Practice Strips

EKG Tutorial

Need a basic EKG course? Essential ECG features are explained along with step-by-step analysis techniques. Rhythm strip exercises provide learning reinforcement.

EKG Tutorial

ECG Quiz

Users are given twenty tracings to analyze. At the end of the quiz, answers are scored and compared to mean and top scores for all recent website visitors.

ECG Quiz

mobile edition of Practical Clinical Skills website
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