Which class of antidysrhythmics is specifically mentioned as membrane-stabilizing agents?

The correct choice is Class 1, as this class of antidysrhythmic drugs is specifically known for their membrane-stabilizing properties. These medications work primarily by blocking sodium channels in the cardiac cell membrane, which leads to a reduction in the excitability and conduction velocity of electrical impulses in the heart. This mechanism is particularly useful in managing various types of tachydysrhythmias and can help restore normal heart rhythm by preventing excessive electrical activity.

Class 2 agents primarily function as beta-blockers and focus on inhibiting adrenergic stimulation rather than directly stabilizing cell membranes. This results in decreased heart rate and myocardial contractility but does not exert the same membrane-stabilizing effects as Class 1 drugs.

Class 3 antidysrhythmics mainly work by blocking potassium channels, thereby prolonging the action potential duration and the refractory period of the cardiac cycle. While they play a critical role in controlling dysrhythmias, their primary action does not involve stabilizing membranes.

Class 4 agents are calcium channel blockers that affect the movement of calcium ions across the cardiac cell membrane. They predominantly influence the heart's ability to contract and the electrical conduction in the atrioventricular (AV) node but do not exert a membrane-st