heart electrical conduction measurement PR interval 2010-06-17T10:40:52Z CMO:0000233 EFO:0004462 EFO:0005095 PQ Interval PR segment Time between the beginning of the P wave to the beginning of the QRS complex, reflects the time the electrical impulse takes to travel from the sinus node through the AV node and entering the ventricles, used as an estimate of AV node function. VT:2000017 clinical_measurement_ontology mshimoyama