https://ecgvn.com/en/tags/pr-segment/ Recent content in Pr Segment on ECG Library – LITFL Basics Hugo en-us Thu, 04 Feb 2021 00:00:00 +0000 https://ecgvn.com/en/posts/pr-segment/ Thu, 04 Feb 2021 00:00:00 +0000 https://ecgvn.com/en/posts/pr-segment/ <p><a href="https://litfl.com/ecg-library/basics/">↪  ECG Basics Homepage</a></p> <p>The <strong>PR segment</strong> is the flat, usually isoelectric segment between the end of the P wave and the start of the QRS complex.</p> <p><a href="https://litfl.com/wp-content/uploads/2018/10/ECG-waves-segments-and-intervals-LITFL-ECG-library-3.jpg"><img alt="ECG basics: waves, segments and intervals LITFL ECG library" loading="lazy" src="https://litfl.com/wp-content/uploads/2018/10/ECG-waves-segments-and-intervals-LITFL-ECG-library-3.jpg"></a></p> <h4 id="pr-segment-abnormalities">PR segment abnormalities</h4> <p>These occur in two main conditions:</p> <ul> <li><a href="https://litfl.com/pericarditis-ecg-library/">Pericarditis</a></li> <li>Atrial ischaemia</li> </ul> <hr> <h4 id="pericarditis">Pericarditis</h4> <p>The characteristic changes of <a href="https://litfl.com/pericarditis-ecg-library/">acute pericarditis</a> are:</p> <ul> <li>PR segment depression.</li> <li>Widespread concave (‘saddle-shaped’) ST elevation.</li> <li>Reciprocal ST depression and PR elevation in aVR and V1</li> <li>Absence of reciprocal ST depression elsewhere.</li> </ul> <p><em>NB. PR segment changes are relative to the baseline formed by the <strong>T-P segment</strong>.</em></p>