Hello, I'm a medical professional with a strong background in cardiology. When it comes to the normal QRS duration, it's an important parameter in interpreting electrocardiograms (ECGs).

The normal QRS duration is typically between **0.06 to 0.10 seconds (60 to 100 milliseconds)**. This duration represents the time it takes for the electrical impulse to depolarize the ventricles, causing them to contract and pump blood. An QRS duration that is shorter than 0.06 seconds is considered narrow, while a duration longer than 0.10 seconds is considered wide or prolonged.

Prolonged QRS duration can be indicative of various conditions, including bundle branch block, ventricular hypertrophy, or other conduction system abnormalities. It's important to note that the interpretation of QRS duration should be made in the context of the entire ECG and the patient's clinical presentation.

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The normal duration (interval) of the QRS complex is between 0.08 and 0.10 seconds �� that is, 80 and 100 milliseconds. When the duration is between 0.10 and 0.12 seconds, it is intermediate or slightly prolonged. A QRS duration of greater than 0.12 seconds is considered abnormal.read more >>