AF Pathophysiology

Question 1

What is the primary abnormality in atrial fibrillation (AF)?

Accepted Answer

Disorganized atrial electrical activity

Answer

Regular ventricular depolarization

Answer

Coordinated atrial contraction

Answer

Blocked AV node

Question 2

Which area of the heart often initiates atrial fibrillation?

Accepted Answer

Pulmonary veins

Answer

Tricuspid valve

Answer

Sinoatrial node

Answer

Left ventricle

Question 3

What is a common consequence of atrial fibrillation on cardiac output?

Accepted Answer

Reduced cardiac output

Answer

Increased stroke volume

Answer

Improved ejection fraction

Answer

Hypertrophy of left ventricle

Question 4

Why does atrial fibrillation increase the risk of stroke?

Accepted Answer

Clot formation due to blood stasis

Answer

High blood pressure in ventricles

Answer

Increased oxygen delivery

Answer

Slower heart rate

Question 5

Which structural change is often seen in the atria of patients with chronic AF?

Accepted Answer

Atrial enlargement

Answer

Ventricular dilation

Answer

Atrial shrinkage

Answer

Coronary occlusion

Question 6

Which electrical abnormality contributes to the persistence of AF?

Accepted Answer

Reentrant electrical circuits

Answer

Unidirectional block only

Answer

Increased AV node firing

Answer

Constant SA node suppression