X pt has a short pr at .11
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short PR interval less than 120 ms ECG causes reputable source
A PR interval of 0.11 seconds (110 ms) is short because normal is about 0.12 to 0.20 seconds.
Interpret it with the rest of the ECG:
- Short PR + delta wave + broad QRS: suggests ventricular pre-excitation, usually Wolff-Parkinson-White (WPW) pattern.
- Short PR + normal/narrow QRS and no delta wave: may reflect enhanced AV nodal conduction, a junctional or low atrial rhythm, or can be an isolated normal variant.
- The key is to inspect P-wave morphology, QRS width, and delta wave. WPW classically has a short PR because conduction crosses an accessory pathway early, producing a slurred QRS upstroke. Braunwald's Heart Disease notes this pattern; Goldman-Cecil Medicine also lists pre-excitation, junctional rhythm, and enhanced AV nodal conduction as causes of a short PR interval.
If the patient has palpitations, documented tachycardia, syncope/presyncope, chest pain, or a family history of sudden cardiac death, obtain a proper 12-lead ECG review and arrange cardiology assessment. A short PR alone, particularly with a normal QRS and no symptoms, is not automatically WPW or an emergency.
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