Question

Consider the following clinicopathological changes in Rheumatic Carditis:
1. Mitral regurgitation
2. Aortic regurgitation
3. Rise in ASLO Titre
4. Left atrial hypertrophy
The correct chronological sequence of these changes would be

• A. 3, 1, 2, 4
• B. 1, 2, 3, 4
• C. 4, 2, 1, 3
• D. 3, 4, 1, 2

Hint:

Think of the immune marker first, then the valve most often hit first, then the second valve, then the chamber that enlarges from the backflow.

Answer 1

The Correct Option is A

Step 1: Start with the trigger event.
Rheumatic carditis follows a throat infection with Group A streptococcus. The body mounts an immune response against the bacteria, and antibodies against streptolysin O appear in the blood within one to three weeks. This rise in ASLO titre is the earliest measurable change and marks the immune reaction that will later attack the heart valves.

Step 2: Follow the immune attack to the valves.
The antibodies raised against the streptococcus cross react with proteins in heart valve tissue, a process called molecular mimicry. Among the heart valves, the mitral valve is affected earliest and most often in acute rheumatic fever, so mitral regurgitation appears next in the sequence, right after the ASLO rise.

Step 3: Continue to the second valve.
As the inflammatory process continues, it commonly extends to the aortic valve as well. Aortic regurgitation typically develops after mitral valve involvement, since the mitral valve bears the initial and heaviest immune assault.

Step 4: Reach the chamber change.
Once mitral regurgitation is established, blood leaks backward into the left atrium with every heartbeat. Over time this chronic volume overload causes the left atrium to enlarge and thicken, so left atrial hypertrophy is a late, downstream consequence rather than an early event.

Step 5: Put the changes in order.
The timeline runs from the immune marker to the valve damage it causes and finally to the chamber remodeling that follows. This gives the order: rise in ASLO titre, mitral regurgitation, aortic regurgitation, left atrial hypertrophy, matching 3, 1, 2, 4.

Step 6: Final answer.
The correct chronological sequence is 3, 1, 2, 4. \[ \boxed{3,\ 1,\ 2,\ 4} \]