Feb 4, 2021 · The normal PR interval is between 120 – 200 ms (0.12-0.20s) in duration (three to five small squares). If the PR interval is > 200 ms, first degree heart block is said to be present.

Aug 16, 2025 · Learn how to interpret the PR interval on ECG — including normal physiology, how to measure it, causes of short and prolonged PR intervals, PR depression in pericarditis and atrial …

Jan 18, 2025 · PR interval must be 0,12–0,22 s (all leads). P-wave must be positive in lead II, otherwise the rhythm cannot be sinus rhythm. P-wave may be biphasic (diphasic) in V1 (the negative deflection …

Oct 23, 2025 · Normal PR Interval The normal PR interval on an electrocardiogram (ECG) ranges from 120 to 200 milliseconds. 1, 2

Mar 17, 2025 · Normal PR interval (0.14 s). It is generally shorter in children (see pediatric EKG) and in pregnant women, and it is longer in older persons. Prolongation of the PR interval above 0.20 s (5 …

Your ECG's PR interval shows how long it takes for your heart's electrical signal to get from the top of your heart, to the bottom of your heart. A prolonged PR interval is 200 milliseconds or longer, which …

Feb 16, 2024 · ECG paper commonly moves at 25 mm/second; thus, each small box (1 mm) is equivalent to 0.04 seconds (40 milliseconds), and each large box (5 mm) is equivalent to 0.2 …

In electrocardiography, the PR interval is the period, measured in milliseconds, that extends from the beginning of the P wave (the onset of atrial depolarization) until the beginning of the QRS complex …

The normal range for the PR interval in adults is 0.12 to 0.20 seconds (120 to 200 milliseconds), corresponding to three to five small squares on standard ECG paper. Deviations from this range can …

A normal PR interval is 120–200 milliseconds long (0.12–0.20 seconds). Short PR intervals suggest the presence of Wolff-Parkinson-White syndrome. Long PR intervals are commonly seen in first-degree …