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©2013 UpToDate ® Print Email Action potential currents Cardiac ion currents responsible for generation of the action potential. The commonly used symbols and name are given for each of the major currents along with the name for the β-subunit gene and, where different, the α-subunit protein. Most channels and exchangers have β-subunits and associated proteins not shown here. In some cases alternative earlier gene names are given after the formal gene name. Diagrams of the currents are shown synchronized with the action potential but amplitudes are not drawn to scale. Courtesy of Jonathan C Makielski, MD, FACC.