Cardiac Electrophysiology and Dysrhythmia Management Quiz

The cardiac conduction system is primarily responsible for electrical signaling in the heart, not blood pressure regulation.

Aging, hypertension, heart disease, and other factors increase the risk of atrial fibrillation, but young age is not typically considered a risk factor.

While supraventricular tachycardia can cause palpitations, chest discomfort, and dizziness, syncope (fainting) is less common.

Sodium influx during depolarization leads to the action potential's initiation.

This voltage range represents the resting state of a cardiac myocyte before any stimulation.

Lead V1 provides a view of the heart's anterior wall, aiding in diagnosing myocardial infarction.

Atrial fibrillation is characterized by chaotic, irregular electrical activity in the atria, leading to the absence of distinct P waves.

Untreated ventricular tachycardia can deteriorate into ventricular fibrillation, leading to cardiac arrest.

Class III antiarrhythmics prolong the action potential duration by blocking potassium channels.

Junctional rhythms often exhibit regular R-R intervals with the absence of P waves or inverted P waves.

Antiarrhythmic drugs like amiodarone or lidocaine are commonly used as initial treatment for stable monomorphic ventricular tachycardia.

Ventricular fibrillation is characterized by chaotic, rapid electrical activity in the ventricles, leading to the absence of coordinated QRS complexes.

Adenosine hyperpolarizes cardiac cells by activating potassium channels, interrupting reentrant pathways and terminating the tachycardia.