In a series of experiments, a new antiarrhythmic medication (drug A) is tested by measuring the flow of ions responsible for producing an action potential in cardiac muscle cells. Ion flow is measured before and after administration of the drug, and the results are shown in the chart below (each colored line represents a different type of ion). Drug A has an antiarrhythmic effect most similar to which of the following drugs?

Question

In a series of experiments, a new antiarrhythmic medication (drug A) is tested by measuring the flow of ions responsible for producing an action potential in cardiac muscle cells. Ion flow is measured before and after administration of the drug, and the results are shown in the chart below (each colored line represents a different type of ion).  Drug A has an antiarrhythmic effect most similar to which of the following drugs?

Quizplus · Accepted Answer

Eductional Objective: Class III antiarrhythmic drugs (for example, amiodarone, sotalol, and dofetilide) primarily block potassium channels and inhibit outward potassium currents during phase 3 of the cardiac action potential, extending repolarization and total action potential duration.

In a Series of Experiments, a New Antiarrhythmic Medication (Drug