https://wikimd.org/index.php?action=history&feed=atom&title=QRS_complexQRS complex - Revision history2026-05-11T07:17:07ZRevision history for this page on the wikiMediaWiki 1.44.2https://wikimd.org/index.php?title=QRS_complex&diff=6336291&oldid=prevPrab: CSV import2025-02-20T01:46:01Z<p>CSV import</p>
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<p><b>New page</b></p><div>'''QRS complex''' is a series of deflections on an [[Electrocardiogram|electrocardiogram (ECG)]] that represents the electrical activity of the heart during ventricular depolarization. The QRS complex is normally the most noticeable feature on the ECG.<br />
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== Overview ==<br />
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The QRS complex is a result of the simultaneous activation of the right and left [[Ventricle (heart)|ventricles]]. Although it is usually more prominent than the other waves, it is not always the largest wave of the ECG. The size of the QRS complex can be influenced by various factors such as the distance between the heart and the electrodes, the mass of the ventricles, and the direction and velocity of the ventricular activation wave.<br />
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== Components ==<br />
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The QRS complex consists of three individual waves: the Q wave, the R wave, and the S wave. The Q wave represents the initial negative deflection, the R wave is the initial positive deflection, and the S wave is the subsequent negative deflection. However, not all QRS complexes contain all three waves. The configuration of the QRS complex can vary widely among individuals, and it can also be influenced by the heart rate and the direction of the heart's electrical axis.<br />
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== Clinical significance ==<br />
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The duration, amplitude, and morphology of the QRS complex are important indicators of many cardiac conditions. For example, a prolonged QRS duration can indicate a [[Bundle branch block|bundle branch block]] or [[Ventricular tachycardia|ventricular tachycardia]]. A low-amplitude QRS complex can suggest a [[Pericardial effusion|pericardial effusion]] or [[Cardiomyopathy|cardiomyopathy]]. Abnormal QRS morphology can be a sign of a previous [[Myocardial infarction|myocardial infarction]] or a [[Ventricular hypertrophy|ventricular hypertrophy]].<br />
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== See also ==<br />
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* [[Electrocardiography]]<br />
* [[P wave (electrocardiography)|P wave]]<br />
* [[T wave]]<br />
* [[U wave]]<br />
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[[Category:Cardiology]]<br />
[[Category:Electrocardiography]]<br />
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