https://ecgvn.com/en/tags/q-wave/ Recent content in Q Wave on ECG Library – LITFL Basics Hugo en-us Tue, 08 Oct 2024 00:00:00 +0000 https://ecgvn.com/en/posts/q-wave/ Tue, 08 Oct 2024 00:00:00 +0000 https://ecgvn.com/en/posts/q-wave/ <h4 id="the-q-wave">The Q Wave</h4> <p>A Q wave is any negative deflection that <em>precedes</em> an R wave</p> <ul> <li>The Q wave represents the normal left-to-right depolarisation of the interventricular septum</li> <li>Small ‘septal’ Q waves are typically seen in the left-sided leads (I, aVL, V5 and V6)</li> </ul> <p><a href="https://litfl.com/wp-content/uploads/2018/08/Normal-Q-wave-in-V6.jpg"><img alt="Normal Q wave in V6" loading="lazy" src="https://litfl.com/wp-content/uploads/2018/08/Normal-Q-wave-in-V6.jpg"></a></p> <hr> <h4 id="q-waves-in-context">Q waves in context</h4> <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> <hr> <h4 id="q-waves-in-different-leads">Q waves in different leads</h4> <ul> <li>Small Q waves are normal in most leads</li> <li>Deeper Q waves (&gt;2 mm) may be seen in leads III and aVR as a normal variant</li> <li>Under normal circumstances, Q waves are not seen in the right-sided leads (V1-3)</li> </ul> <hr> <h4 id="pathological-q-waves">Pathological Q Waves</h4> <p>Q waves are considered pathological if:</p>