Quinidine exes action on hea by
Refer katzung 11e p 237 * Mechanism of action Like all other class I antiarrhythmic agents, quinidine primarily works by blocking the fast inward sodium current (INa). ... The effect of blocking the fast inward sodium current causes the phase 0 depolarization of the cardiac action potential to decrease (decreased Vmax).
Ca+ Channel blocker
Kt Channel blocker
Na+ Channel opener
Cl+ Channel opener
Cardiovascular system