Abstract

Pacemaker channels, as has been appreciated since they were first described, have a most unusual and complex set of properties (DiFrancesco & Borer, 2007). This complexity belies their role in the sinoatrial (SA) node, which is deceivingly simple: to enable nodal myocytes to beat in an efficient and cyclic AMP-sensitive manner. This singularity of purpose has made them a preferred choice to provide a pacing boost to cells with little inclination to beat on their own, in the form of a biological pacemaker (Rosen et al. 2007, 2008), as well as a target for drugs that inhibit heart rate specifically (DiFrancesco & Borer, 2007). Pacemaker channels are also known as ‘funny’ or ‘hyperpolarization-activated cyclic nucleotide-modulated’ (HCN) channels in reference to their uncommon characteristics.

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