As a medical professional with expertise in cardiology, I can provide you with information on the normal QRS duration.

The normal QRS duration on an ECG (Electrocardiogram) is typically between **0.06 to 0.10 seconds (60 to 100 milliseconds)**. The QRS complex represents the depolarization of the ventricles, and the duration of this complex can vary based on several factors, including heart rate, electrolyte balance, and certain medications or conditions that affect the heart.

It's important to note that variations outside of this range can indicate certain cardiac conditions. For instance, a QRS duration that is too short (less than 0.06 seconds) can be seen in conditions like hyperkalemia, while a prolonged QRS duration (greater than 0.12 seconds) may be associated with bundle branch block, ventricular hypertrophy, or the effects of certain drugs.

In the context of an ECG, it's crucial to interpret the QRS duration in conjunction with other ECG features and clinical findings to make an accurate diagnosis.

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Prolongation of QRS (��120 ms) is a significant predictor of LV systolic dysfunction in patients with HF (4,8,10,11,22). In contrast, the significance of QRS prolongation has not yet been evaluated in HF with a normal LVEF and diastolic dysfunction.read more >>