The Most common cause of embolism causing cerebro vascular disease is
**Core Concept**
Cardioembolic stroke occurs when a blood clot forms in the heart and travels to the brain, causing a blockage in a cerebral artery. This is often due to an underlying cardiac condition that predisposes to clot formation.
**Why the Correct Answer is Right**
The most common cause of cardioembolic stroke is atrial fibrillation. This is because atrial fibrillation leads to stasis of blood in the left atrium, promoting clot formation. The clot can then break loose and travel to the brain, causing a stroke. The left atrium is a common site for clot formation due to its relatively slow blood flow and the presence of fibrinogen, a clot-promoting protein.
**Why Each Wrong Option is Incorrect**
**Option A:** While cardiac tamponade can cause embolism, it is not the most common cause of cardioembolic stroke.
**Option B:** Mitral valve disease can cause embolism, but it is not as common as atrial fibrillation.
**Option C:** Patent foramen ovale (PFO) can cause paradoxical embolism, but it is not the most common cause of cardioembolic stroke.
**Clinical Pearl / High-Yield Fact**
Atrial fibrillation is the most common cause of cardioembolic stroke, and it is often associated with other risk factors such as hypertension, diabetes, and previous stroke.
**Correct Answer: B. Mitral valve disease is a common cause of cardioembolic stroke.**