https://ecgvn.com/en/tags/sinus-arrhythmia/ Recent content in Sinus Arrhythmia on ECG Library – LITFL Basics Hugo en-us Tue, 08 Oct 2024 00:00:00 +0000 https://ecgvn.com/en/posts/sinus-arrhythmia/ Tue, 08 Oct 2024 00:00:00 +0000 https://ecgvn.com/en/posts/sinus-arrhythmia/ <h5 id="sinus-arrhythmia-overview">Sinus Arrhythmia Overview</h5> <p><a href="https://litfl.com/normal-sinus-rhythm-ecg-library/">Sinus rhythm</a> with a beat-to-beat variation in the P-P interval (the time between successive P waves), producing an irregular ventricular rate.</p> <p><a href="https://litfl.com/wp-content/uploads/2018/08/ECG-Sinus-arrhythmia-lead-II.jpg"><img alt="ECG Sinus arrhythmia lead II" loading="lazy" src="https://litfl.com/wp-content/uploads/2018/08/ECG-Sinus-arrhythmia-lead-II-1024x105.jpg"></a></p> <h5 id="characteristics">Characteristics</h5> <ul> <li>Variation in the P-P interval of more than 120 ms (3 small boxes).</li> <li>The P-P interval gradually lengthens and shortens in a cyclical fashion, usually corresponding to the phases of the respiratory cycle.</li> <li><a href="https://litfl.com/p-wave-ecg-library/">Normal sinus P waves</a> with a constant morphology (i.e. no evidence of premature atrial contractions).</li> <li>Constant P-R interval (i.e. no evidence of <a href="https://litfl.com/av-block-2nd-degree-mobitz-i-wenckebach-phenomenon/">Mobitz I AV block</a>).</li> </ul> <hr> <h5 id="mechanism">Mechanism</h5> <p>Sinus arrhythmia is a normal physiological phenomenon, most commnonly seen in young, healthy people.</p>