Lehmann, M H Quantitating AV nodal function: has A1A2 outlived its usefulness? [electronic resource] - Pacing and clinical electrophysiology : PACE Dec 1990 - 1674-7 p. digital Publication Type: Comment; Editorial ISSN: 0147-8389 Standard No.: 10.1111/j.1540-8159.1990.tb06870.x doi Subjects--Topical Terms: Atrioventricular Node--physiologyCardiac Pacing, ArtificialElectrocardiographyElectrophysiologyHeart Block--physiopathologyHumansRefractory Period, Electrophysiological