Which of the Following Is True of Class 2 Antiarrhythmic

question 24

Multiple Choice

Which of the following is true of Class 2 antiarrhythmic drugs?

• A) They tend to shorten the cardiac refractory period.
• B) They increase the excitability, conduction, and automaticity of ventricular muscle.
• C) They decrease heart rate, atrioventricular (AV) conduction, and automaticity of the sinoatrial (SA) and AV nodes.
• D) They are mainly indicated for arrhythmias that originate below the AV node.

---

Definitions:

Cis-3-Ethyl

Pertains to the geometric configuration where two specified substituents on a double bond or in a cyclical structure are on the same side.

Epoxycyclopentane

A cyclic ether where an oxygen atom is incorporated into a cyclopentane ring, forming a three-membered epoxide ring.

1,2-Epoxybutane

A colorless liquid organic compound, which is an epoxide derivative of butane where an oxygen atom is inserted into the carbon chain forming a three-membered ring structure.

2-Ethyloxirane

A three-membered epoxy compound with ethyl substitution, involved in organic synthesis as an intermediate.