What is the normal range for QRS interval duration?

The QRS interval duration, which represents the time it takes for the ventricles of the heart to depolarize and contract, is considered normal when it falls within the range of 0.04 to 0.10 seconds. This interval is measured on an electrocardiogram (ECG) and is crucial for assessing the electrical conduction through the heart's ventricles.

A QRS duration shorter than this normal range may suggest a more efficient conduction system, whereas a duration longer than 0.10 seconds may indicate a delay in conduction, such as in the case of bundle branch blocks or other types of conduction abnormality. Recognizing the normal range is essential for accurate interpretation of ECGs and diagnosing potential arrhythmias or other cardiac conditions. By understanding this standard range, healthcare providers can better evaluate a patient's cardiac health and identify any potential issues that need to be addressed.