Atrial fibrillation (Afib) is a common heart rhythm disorder where the upper chambers of the heart (atria) beat irregularly and chaotically, instead of the normal, coordinated pumping action. This irregularity disrupts the heart's ability to efficiently pump blood throughout the body.

How Afib Increases Stroke Risk:

While Afib itself doesn't directly cause strokes, it significantly increases the risk. Here's why:

1. Blood Clot Formation: Afib disrupts the normal flow of blood through the atria. This stagnant blood can pool and form clots, especially in a small appendage called the left atrial appendage (LAA).

2. Clot Embolization: If a clot breaks off from the LAA, it can travel through the bloodstream and lodge itself in an artery in the brain, causing a stroke.

Other Risk Factors for Stroke:

Afib's impact on stroke risk is further amplified by the presence of other factors, such as:

• High blood pressure: Puts additional strain on blood vessels and increases the risk of rupture by a clot.

• Diabetes: Damages blood vessels and increases clotting tendency.

• Age: The risk of stroke increases with age.

• Previous stroke: Having had a stroke in the past increases the risk of another.

• Atherosclerosis (hardening of arteries): Narrowed arteries are more susceptible to blockage by a clot.