Short PR. Normal P wave with PR interval < 0.12 sec.
Patient. 31 year old female came to emergency room following an episode of syncopy consistent with vavagal type. She has no history of palpitation or documented tachycardia. Her privious ECG had similar pattern.

The possible etiologies of short PR interval are:
  Rapid conduction in an anatomically normal AV node.
  Conduction through fast pathway.
  Paranodal fiber, Conduction bypasses most or all of the AV node.
Small, underdeveloped AV node.

Lown-Ganong-Levine syndrome include: (1). PR interval <0.12 second. (2). Normal P wave. (3). Normal QRS duration. (4). Documented paroxysmal supraventricular tachycardia.

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