TY - CHAP M1 - Book, Section TI - The Bradyarrhythmias: Disorders of the Atrioventricular Node A1 - Spragg, David D. A1 - Tomaselli, Gordon F. A2 - Jameson, J. Larry A2 - Fauci, Anthony S. A2 - Kasper, Dennis L. A2 - Hauser, Stephen L. A2 - Longo, Dan L. A2 - Loscalzo, Joseph PY - 2018 T2 - Harrison's Principles of Internal Medicine, 20e AB - Impulses generated in the sinoatrial (SA) node or in ectopic atrial loci are conducted to the ventricles through the electrically and anatomically complex atrioventricular (AV) node. As described in Chap. 239, the electrophysiologic properties of nodal tissue are distinct from atrial and ventricular myocardium. Cells located in the AV node sit at a relatively higher resting membrane potential than surrounding atrial and ventricular myocytes, exhibit spontaneous depolarization during phase 4 of the action potential, and have slower phase 0 depolarization (mediated by calcium influx in nodal tissue) than that seen in ventricular tissue (mediated by sodium influx). SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/10/07 UR - accessmedicine.mhmedical.com/content.aspx?aid=1155973485 ER -