https://ecgvn.com/en/tags/lad/ Recent content in Lad on ECG Library – LITFL Basics Hugo en-us Tue, 08 Oct 2024 00:00:00 +0000 https://ecgvn.com/en/posts/left-axis-deviation-lad/ Tue, 08 Oct 2024 00:00:00 +0000 https://ecgvn.com/en/posts/left-axis-deviation-lad/ <h4 id="left-axis-deviation-lad">Left Axis Deviation LAD</h4> <p><strong>Left Axis Deviation</strong> = QRS axis less than -30°.</p> <ul> <li><strong>Normal Axis</strong> = QRS axis between -30° and +90°</li> <li><strong>Right Axis Deviation</strong> = QRS axis greater than +90°</li> <li><strong>Extreme Axis Deviation</strong> = QRS axis between -90° and 180° (AKA “Northwest Axis”)</li> </ul> <hr> <p><strong>Hexaxial Reference System</strong></p> <p><img alt="Haxaxial ECG AXIS Reference 2021" loading="lazy" src="https://litfl.com/wp-content/uploads/2018/08/Haxaxial-ECG-AXIS-Reference-2021-1024x986.png"></p> <p><a href="https://litfl.com/ecg-axis-interpretation/">Hexaxial Reference System</a> – relationship between QRS axis and frontal leads of the ECG.</p> <hr> <h4 id="how-to-recognise-left-axis-deviation">How to recognise left axis deviation</h4> <h5 id="three-lead-analysis">Three Lead analysis</h5> <ul> <li>QRS is POSITIVE (dominant R wave) in Lead I</li> <li>QRS is NEGATIVE (dominant S wave) in leads II, III and aVF</li> </ul> <p><img alt="Lead I II aVF Hexaxial Evaluation LAD Pathological 2021" loading="lazy" src="https://litfl.com/wp-content/uploads/2018/08/Lead-I-II-aVF-Hexaxial-Evaluation-LAD-Pathological-2021-1024x464.png"><img alt="Lead I II aVF Hexaxial Evaluation LAD Pathological 2021" loading="lazy" src="https://litfl.com/wp-content/uploads/2018/08/Lead-I-II-aVF-Hexaxial-Evaluation-LAD-Pathological-2021-1024x464.png"></p>