Background K+ channels are the principal determinants of the resting membrane potential (RMP) in cardiac myocytes and thus, influence the magnitude and time course of the action potential (AP).
The George and Jean Brumley, Jr, Neonatal-Perinatal Research Institute, Division of Neonatology/Department of Pediatrics, Duke University Medical Center, Box 2635, Durham, NC 27710, USA. zht@duke.edu