Multi-infarct Dementia (MID) is caused by?

Appeared in: RIMS Nursing Officer - 2022

Explanation

Multi-infarct dementia (MID) is a common type of vascular dementia.
It is caused by the cumulative effect of multiple strokes (infarcts) that damage and destroy brain tissue over time.
These strokes interrupt the brain's blood supply, leading to a stepwise decline in cognitive functions like memory, reasoning, and judgment.
The underlying causes are often related to cerebrovascular diseases such as atherosclerosis, thrombosis, or embolism.

Option A: A heart attack (myocardial infarction) is damage to the heart muscle due to a lack of blood supply. It does not directly cause the brain infarcts that define MID.
Option B: Nephritis is inflammation of the kidneys. It is a renal condition and is not related to the cerebrovascular events that cause multi-infarct dementia.
Option D: Parkinsonism is a clinical syndrome featuring tremor, rigidity, and slow movement. While dementia can occur in Parkinson's disease, it is a distinct type (Parkinson's disease dementia or Lewy body dementia) with a different underlying pathology (protein deposits called Lewy bodies), not vascular infarcts.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Etiology of Multi-infarct Dementia (Vascular Dementia) as background academic context rather than a clinical decision trigger.
The primary nursing role in MID is focused on prevention of further strokes by managing vascular risk factors.
Nurses must educate patients and families on the importance of controlling blood pressure, managing diabetes, smoking cessation, maintaining a healthy diet, and adhering to prescribed medications (e.g., antiplatelets, anticoagulants).
Recognizing the 'stepwise' decline is crucial. A sudden worsening of symptoms should prompt immediate medical evaluation for a new stroke.

How to Approach the Question

First, identify the key term in the question: 'Multi-infarct Dementia (MID)'.
Break down the term into its components: 'Multi' means many, and 'infarct' refers to tissue death caused by a lack of blood supply, which is the definition of a stroke.
Therefore, the name of the condition itself points directly to its cause: multiple strokes.
Scan the options to find the one that matches this definition.
Option C, 'Multiple Strokes', is a direct match. The other options describe different medical conditions affecting the heart, kidneys, and motor systems, which are not the primary cause of MID.

Concept Tested & Keywords

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E6 Pathology- ROBBINS & COTRAN PATHOLOGIC BASIS OF DISEASE 10TH Ed p. 1258-1260

E6 Medicine Harrison 22e Part 2 p. 1393-1395

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Attempt every question from this paper in a timed mock, then review the full solution for each one.