heart electrical conduction measurement PR interval EFO:0005095 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. 2010-06-17T10:40:52Z clinical_measurement_ontology EFO:0004462 PR segment mshimoyama CMO:0000233 VT:2000017 PQ Interval