AIIMS BHOPAL NO- 2018…: Elevated levels of antistreptolysin O are seen in:

AIIMS BHOPAL NO- 2018( Shift-2nd)

Medical & Surgical Nursing

Easy

Appeared in: AIIMS BHOPAL NO- 2018( Shift-2nd)

Explanation

Rheumatic fever is an autoimmune inflammatory condition that occurs as a delayed sequela to a Group A Streptococcus (GAS) infection.
The body produces antibodies, including Antistreptolysin O (ASO), to neutralize toxins produced by the streptococcal bacteria.
An elevated ASO titer is a key laboratory finding that provides evidence of a recent GAS infection, which is an essential criterion for diagnosing rheumatic fever.
According to the revised Jones Criteria, evidence of a preceding GAS infection (like an elevated ASO titer) is required to diagnose acute rheumatic fever.

Option A: Subacute endocarditis is an infection of the heart's endocardial surface, but it is most commonly caused by Streptococcus viridans or other organisms, not Group A Streptococcus. Diagnosis is confirmed by positive blood cultures.
Option B: A ventricular septal defect (VSD) is a congenital structural heart defect (a hole in the wall separating the two lower chambers of the heart). It is present from birth and is not related to an infectious or inflammatory process.
Option D: Cardiomyopathy is a broad term for diseases affecting the heart muscle itself. While severe rheumatic fever can lead to rheumatic carditis (a type of cardiomyopathy), the term itself has numerous other causes (viral, genetic, alcoholic, idiopathic) and is not specifically diagnosed by an ASO titer.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Diagnostic markers for Rheumatic Fever as background academic context rather than a clinical decision trigger.
A nurse's primary role in preventing rheumatic fever is through patient education about the importance of completing the full course of antibiotics for strep throat. This eradicates the bacteria and prevents the delayed autoimmune response.
During an acute episode of rheumatic fever, nurses must monitor for signs of carditis (new murmurs, tachycardia, chest pain), administer anti-inflammatory medications as prescribed, and enforce bed rest to reduce cardiac workload.
What if? If a patient has a high ASO titer but no clinical symptoms of rheumatic fever, it indicates a recent streptococcal infection but not necessarily the disease. This patient may be a carrier or have had a subclinical infection. They would not be diagnosed with rheumatic fever but might be considered for prophylactic antibiotics if they have a history of the disease to prevent recurrence.

How to Approach the Question

First, identify the key term in the question: 'antistreptolysin O' (ASO).
Recall or deduce the significance of ASO. The prefix 'anti-' indicates an antibody, and 'strepto-' points towards streptococcus bacteria.
Connect the elevated ASO level to a recent streptococcal infection.
Evaluate the options to see which condition is a known post-streptococcal complication.
Rheumatic fever is the classic example of a disease that follows a Group A streptococcal infection. The other options are either congenital (VSD), caused by different organisms (endocarditis), or a general category of disease (cardiomyopathy).

Concept Tested & Keywords

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E6 Ghai Essential Pediatrics(pp 26-904 of 913) pp. 460-462, 466-468

E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 1717-1719