Cardiac Dysrhythmias Quiz

Atrial fibrillation presents with irregular and rapid pulse due to chaotic atrial electrical activity.

Normal resting heart rate in adults typically ranges from 60 to 80 beats per minute.

Bradycardia refers to a heart rate less than 60 beats per minute, potentially leading to symptoms like dizziness or fainting.

Tachycardia is characterized by a heart rate exceeding 100 beats per minute, potentially causing symptoms like palpitations or dizziness.

The SA node initiates the heartbeat by generating electrical impulses, serving as the heart's natural pacemaker.

Atrial fibrillation is characterized by chaotic, rapid heartbeats originating from the atria.

The AV node conducts electrical signals from the atria to the ventricles, coordinating heart contractions.

The P-wave represents atrial depolarization, the electrical activation of the atria.

Untreated atrial fibrillation increases the risk of stroke due to blood clots forming in the atria.

PSVT refers to episodes of rapid, irregular heartbeats originating above the ventricles, often resolving on their own.

Adenosine is commonly used to treat SVT due to its ability to slow down conduction in the AV node.

Long QT syndrome is characterized by a prolonged QT interval on an ECG, increasing the risk of arrhythmias.

Beta-blockers primarily work by blocking beta-adrenergic receptors, reducing heart rate and contractility.

Hyperkalemia, an elevated potassium level, can lead to ventricular dysrhythmias such as ventricular tachycardia or fibrillation.

Class I antiarrhythmic drugs primarily block sodium channels, affecting the depolarization phase of cardiac action potentials.