Question

Choose the correct sequence from the option for evolution of pathologic hypertensive arteriolosclerosis.
A. Increase in Extra cellular matrix (ECM), smooth muscle proliferation
B. Vascular injury from malignant hypertension
C. Stress (haemodynamic, metabolic)
D. Increase in Permeability, leakage of plasma components
Choose the correct answer from the options given below :

• A. A, C, B, D
• B. C, D, A, B
• C. B, C, D, A
• D. D, A, B, C

Hint:

Pathology sequences follow cause and effect:
1. The Cause (Stress)
2. The Immediate Damage (Leakage)
3. The Body's Response (ECM Proliferation)
4. The Final Pathological Outcome (Malignant Injury/Necrosis).

Answer 1

The Correct Option is B

Step 1: Concept:
The question asks us to order the pathological steps underlying the development of hypertensive arteriolosclerosis, charting the progression from initial physical stress to severe malignant vascular damage.

Step 2: Step-by-step Explanation:

• Arteriolosclerosis refers to the thickening and hardening of the walls of small arteries (arterioles). It fundamentally occurs as an adaptive (and ultimately destructive) response to chronic high blood pressure.

• Step 1 (C - Stress): The initiating event is chronic hemodynamic stress caused by high hydrostatic pressure inside the blood vessel, sometimes coupled with metabolic stress (e.g., in diabetes).

• Step 2 (D - Permeability): This persistent mechanical stress physically damages the delicate endothelial cells lining the vessels. This endothelial dysfunction causes an increase in vascular permeability, allowing plasma components (like proteins and lipids) to leak into and accumulate within the vessel wall (intima).

• Step 3 (A - Proliferation): In response to the endothelial injury and plasma leakage, the body attempts to repair the vessel. Smooth muscle cells migrate into the intima, rapidly proliferate, and synthesize large amounts of Extracellular Matrix (ECM) (collagen and proteoglycans). This causes the walls to aggressively thicken, narrowing the lumen.

• Step 4 (B - Malignant Injury): If the hypertension continues unabated and reaches extreme, malignant levels, this narrowed, stiffened vessel suffers catastrophic acute failure. This leads to profound vascular injury characterized by fibrinoid necrosis (hyperplastic arteriolosclerosis), typical of malignant hypertension.

• Therefore, the sequential biological progression is completely logical: C \(\rightarrow\) D \(\rightarrow\) A \(\rightarrow\) B.

Step 3: Final Answer:
The correct pathophysiological sequence matches Option (B).