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Action potential duration (APD) not affected by [Na+]o, [Ca2+]o, or Cx43 expression. A: representative action potentials from the same heart perfused with [Ca2+]o = 1 mM (black) and 3.4 mM (gray). B: neither [Na+]o, [Ca2+]o, nor Cx43 expression alter mean epicardial APD.
