Hello doctors, what does a short pr interval mean?

Fast conduction: The impulse from top of heart -sinus node originates and short circuits through a faster conduction tissues to the ventricle - short circuiting the av node or bypasses the av node- resulting on the ECG as short pr interval and some patients can get tachycardia from this, and might need specialist care - electrophysiologist.

Many things: This could because from such abnormalities as WPW syndrome but in the absence of other abnormalities could represent a normal variant.