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Ionic currents during cardiac action potential. Downward reperesents inward (depolarizing), upward shows outward (repolarizing) currents. INa= inward sodium current; ICa= inward calcium current; Ito= transient outward potassium current; IKr= rapid component of outward delayed rectifier potassium current; IKs= slow component of outward delayed rectifier potassium current; Isus= outward sustained potassium current; IK1= inward rectifier potassium current.
