
Synchronization of sinoatrial node pacemaker cell clocks and its autonomic modulation impart complexity to heart beating intervals
Keywords: AP, action potential; ApEn, approximate entropy; β-AR, β-adrenergic receptor; BIV, beating interval variability; CaMKII, Ca2+/calmodulin-dependent protein kinase II; CR, cholinergic receptor; CV, coefficient of variation; DFA, detrended fluctuation analys