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The PR interval is significant because it represents the time taken for electrical impulses to travel from the atria to the ventricles. This interval is measured from the beginning of the P wave (which indicates atrial depolarization) to the beginning of the QRS complex (which indicates ventricular depolarization).

The duration of the PR interval is crucial for assessing the overall conduction system of the heart, particularly identifying any delays in conduction between the atria and ventricles, known as atrioventricular (AV) block. Normal values for the PR interval range from 120 to 200 milliseconds, and deviations from this range can indicate conduction abnormalities, requiring further investigation and clinical correlation.

Understanding the significance of the PR interval helps healthcare professionals in diagnosing and managing various cardiac conditions, showcasing its importance in cardiographic assessment and interpretation.