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We found 3 dictionaries that define the word PR interval:

General (1 matching dictionary)
  1. PR interval: Wikipedia, the Free Encyclopedia

Medicine (2 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)

Definitions from Wikipedia (PR interval)

noun:  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 onset of ventricular depolarization); it is normally between 120 and 200 ms in duration.


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