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Showing posts with the label antiarrhythmic drugs

Pharmacologically Induced Myocardial Protection During Cardiac Surgery

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Both β-adrenergic receptor blockers and calcium channel blockers, when used alongside other methods, have been incorporated into myocardial management strategies by various groups. Calcium channel blockers such as verapamil and diltiazem are particularly beneficial due to their ability to prevent calcium entry into cells and their coronary vasodilatory effects. However, these drugs are also strong negative inotropes and cause prolonged electromechanical inactivity, especially when used in cardioplegic solutions.

Antiarrhythmic Drugs and Associated Arrhythmias.

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Class I: Fast sodium (Na) channel blockers:  Ia - Quinidine, procainamide, disopyramide (depress phase 0, prolonging repolarization)  Ib - Lidocaine, phenytoin, mexiletine (depress phase 0 selectively in abnormal/ischemic tissue, shorten repolarization)  Ic - Flecainide, propafenone, moricizine (markedly depress phase 0, minimal effect on repolarization)