🧠 Vascular Dementia

✅ Answer: (C) Cerebral Ischemia

📖 What is Vascular Dementia?

Vascular = Related to blood vessels.
Dementia = Progressive decline in memory, thinking, and cognitive function that interferes with daily activities.

👉 Vascular dementia is the second most common type of dementia after Alzheimer’s disease. It occurs when the brain receives an inadequate blood supply, leading to damage of brain tissue.

📖 What is Cerebral Ischemia?

Cerebral = Related to the brain.
Ischemia = Reduced blood flow and oxygen supply to tissues.

👉 In cerebral ischemia, blockage or narrowing of brain blood vessels reduces oxygen delivery, causing repeated small strokes or infarctions that gradually impair memory and thinking.

🩺 Why is Option (C) Correct?

Vascular dementia develops because:

• ✔ Blood flow to the brain is reduced.
• ✔ Brain cells are damaged due to lack of oxygen.
• ✔ Multiple small strokes (multi-infarct dementia) or chronic ischemia occur.
• ✔ Cognitive decline progresses in a stepwise pattern.

👉 Therefore, cerebral ischemia is the underlying cause of vascular dementia.

❌ Why Other Options Are Wrong?

(A) Aneurysm Rupture
❌ A ruptured aneurysm causes a hemorrhagic stroke or subarachnoid hemorrhage. Although brain injury may occur, it is not the usual cause of vascular dementia.

(B) Intracranial Infection
❌ Brain infections such as meningitis or encephalitis may cause neurological problems but are not the typical cause of vascular dementia.

(D) All of the Above
❌ Incorrect because the classic and primary cause of vascular dementia is cerebral ischemia, not aneurysm rupture or intracranial infection.

📝 Types of Dementia

📌 Exam Tip: Vascular dementia is commonly associated with hypertension, diabetes, smoking, and previous strokes. Unlike Alzheimer’s disease, it often shows a stepwise decline, where cognitive function worsens after each ischemic event.