CMT Cardiac Dysrhythmias and Arrhythmias

Question 1

What is the most common cause of atrial fibrillation?

Accepted Answer

Hypertension.

Answer

Hypertension, or high blood pressure, is considered the most common underlying cause of atrial fibrillation (AFib). Chronic high blood pressure puts increased stress on the heart, leading to structural changes and enlargement of the left atrium. These changes create an environment conducive to the development and perpetuation of the disorganized electrical activity characteristic of AFib.

Question 2

Which arrhythmia is characterized by a rapid and irregular heart rate, often over 100 bpm?

Accepted Answer

Atrial fibrillation.

Answer

Atrial fibrillation (AFib) is a common cardiac arrhythmia characterized by a rapid, chaotic, and irregular electrical activity in the atria. This leads to an uncoordinated atrial contraction, often resulting in an irregularly irregular ventricular rate that can exceed 100 beats per minute. The rapid and erratic atrial impulses prevent effective atrial pumping and can lead to symptoms like palpitations and fatigue.

Question 3

Which is a common symptom of ventricular tachycardia?

Accepted Answer

Dizziness, chest pain, and shortness of breath.

Answer

Ventricular tachycardia (VT) is a serious arrhythmia where the ventricles beat very rapidly and often inefficiently. This rapid, ineffective pumping significantly reduces cardiac output, leading to decreased blood flow to vital organs. Common symptoms include dizziness or lightheadedness due to reduced brain perfusion, chest pain from myocardial ischemia, and shortness of breath as the heart struggles to meet oxygen demands.

Question 4

What is the main treatment for atrial fibrillation in many cases?

Accepted Answer

Rate control and anticoagulation therapy.

Answer

The main treatment strategy for atrial fibrillation often involves a dual approach: rate control and anticoagulation therapy. Rate control medications aim to slow the ventricular response, improving symptoms and cardiac efficiency. Anticoagulation therapy, typically with blood thinners, is crucial to prevent the formation of blood clots in the fibrillating atria, thereby significantly reducing the risk of stroke.

Question 5

What is the primary characteristic of bradycardia?

Accepted Answer

A heart rate under 60 bpm.

Answer

Bradycardia is defined as a heart rate that is abnormally slow, specifically under 60 beats per minute in adults. While some athletes may have a naturally low resting heart rate, symptomatic bradycardia can indicate an issue with the heart's electrical conduction system. A heart rate below this threshold may not adequately pump blood to meet the body's demands, leading to symptoms like fatigue or dizziness.

(CMT) Certified Cardiac Monitor Technician Practice Test

(CMT) Certified Cardiac Monitor Technician Practice Test

CMT Cardiac Dysrhythmias and Arrhythmias