[Quantitative description of a calcium induced potassium conductance of the rabbit atrial myocardium by variation of the Ca++ concentration].

Action potentials of trabeculae from the left rabbit atrium were studied using a modified sucrose gap method. A mathematical treatment of the action potential time course and the phase plane trajectories gives an approximation of a potassium conductance of gK.GK increases be action potential shows a maximum at 1 s.gK reaches a steady state level after 40 s. The experimental findings are interpreted by means a mathematical model of a Ca++-induced K+-conductance.