Monday, February 9, 2015

Study group discussion: Short PR interval causes

Review question c: What are 3 causes of a short PR interval?

Wolff Parkinson White syndrome is one.

Yeah, but in general? What physiological alterations can cause that?

The re-entrant pathway.

As in... WPW causes it because it works as an accessory AV pathway.

1. Accelerated AV conduction
2. Tachycardia
3. Accessory AV pathway

Other cause is rheumatic fever.
It's one of the minor criteria for diagnosis in the Jones criteria.
Oops.. Rheumatic fever is a cause for increased PR interval.. My bad.

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