Abstract
A large number of different K channels have been described in different cell types (for a review see [1]). Also cardiac tissue has a wide variety of K channels, in addition to the well-known Na and Ca channels [2]. The cardiac K channels play an important role in establishing the shape of the electrical signal which initiates the contraction. Most of the currents carried by these channels have been identified in voltage-clamp experiments in multicellular preparations (see [3]) and single cells, based on time and voltage dependence of the current and its modulation by ions, drugs, and hormones. However, one of the main problems in the interpretation of results obtained from voltage-clamp experiments is the separation of the different ionic current components from the net current measured. Erroneous separation results in incorrect identification of these components, and hence the large number of different ionic currents in the heart, was often blamed on an inability to adequately separate the ionic currents in a tissue as complex as cardiac muscle [4].
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Vereecke, J., Carmeliet, E. (1989). The Cardiac K Current System. In: Brachmann, J., Schömig, A. (eds) Adrenergic System and Ventricular Arrhythmias in Myocardial Infarction. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-74317-7_15
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