Schematic representation of a normal
sinus rhythm EKG wave
In
electrocardiography, the PR interval is the period, measured in milliseconds, that extends from the beginning of the
P wave (the onset of
atrialdepolarization) until the beginning of the
QRS complex (the onset of
ventricular depolarization); it is normally between 120 and 200 ms in duration.
The PR interval is sometimes termed the PQ interval.
Interpretation
Variations in the PQ interval can be associated with certain medical conditions:
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