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What are Class IV antiarrhythmics?

If necessary, direct antiarrhythmic therapy, including antiarrhythmic… read more : Class IV drugs are the nondihydropyridine calcium channel blockers, which depress calcium-dependent action potentials in slow-channel tissues and thus decrease the rate of automaticity, slow conduction velocity, and prolong …

How do you memorize antiarrhythmic drugs?

The mnemonic to remember the different classes of antiarrhythmic medications is “Some Block Potassium Channels”. “Some” = Sodium channel blockers = Class I antiarrhythmics. “Block” = Beta blockers = Class II antiarrhythmics. “Potassium” = Potassium channel blockers = Class III antiarrhythmics.

Which of the following is contraindicated for Class IV antiarrhythmics?

Contraindications: sinus bradycardia, 2nd or 3rd degree AV block, long QT syndrome, heart failure, cardiogenic shock.

Which of the following drug belongs to the class IV antiarrhythmic agents?


Classes of antiarrhythmic drugs [1]
Class Examples
Class IV antiarrhythmic drugs Verapamil Diltiazem Nifedipine
Class V antiarrhythmic drugs Adenosine (drug)
Magnesium sulfate

Is nifedipine an antiarrhythmic drug?

For example, dihydropyridines, such as nifedipine, are probably not clinically useful antiarrhythmics, possibly because of their clinically dominant vascular effects, and/or a relative lack of frequency dependence (97).

What are most widely used class of antiarrhythmics?

beta blockers form class II. Class III agents, such as amiodarone and sotalol, prolong action potential duration and repolarization and are among the most widely used antiarrhythmics. They are the subject of active research, and newer agents are being developed. Calcium-channel blockers are grouped under class IV.

What are the Class 1 antiarrhythmic drugs?

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)

What are the effects of class Ia antiarrhythmics?

Class Ia Antiarrhythmics Mechanism of Action •Moderately blocks sodium influx and potassium efflux Indication •Atrial fibrillation and flutter •Ventricular and supraventricular tachyarrhythmias Arrhythmia •Prolonged QT interval •May cause Torsades de Pointes Agents: Quinidine, Procainamide, Disopyramide

Which is the best classification for Antiarrhythmic Drugs?

Although different classification schemes have been proposed, the first scheme (Vaughan-Williams) is still the one that most physicians use when speaking of antiarrhythmic drugs. The following table shows the Vaughan-Williams classification and the basic mechanism of action associated with each class.

Which is the best antiarrhythmic in the world?

“LInDO MEXIco Is the Best”: LIDOcaine and MEXIletine are class IB antiarrhythmic drugs. “I Can’t Fail, Please”: Class IC antiarrhythmics are Flecainide, Propafenone. “I Am Sober, Doctor, for III days”: Ibutilide, Amiodarone, Sotalol, and Dofetilide are class III antiarrhythmic drugs.

How many ICDs are treated with antiarrhythmic drugs?

Pharmacological Effects of Antiarrhythmic Drugs Review and Update. Reports about the percentage of patients with ICDs who are receiving concomitant antiarrhythmic drug therapy range from approximately 20% to 88%. Most studies, however, suggest that more than 50% of patients with ICDs also receive antiarrhythmic drugs.