While doing bedside rounds, a nurse posted in the paediatric urology ward saw a 5-year-old child. On being asked about the child's medical history, the child's mother said that the child had recently had a streptococcal throat infection. She also reported periorbital and facial oedema, decreased urine output and haematuria. The child's blood pressure was 156/98 mm of Hg and lab investigations showed increased blood urea nitrogen level and creatinine level and increased anti-streptolysin O titer. Based on these inputs, what may be the probable diagnosis of the child?

1. A

   Polycystic kidney disease

2. B

   Nephrotic syndrome

3. C

   Glomerulonephritis

4. D

   Haemolytic uremic syndrome

Appeared in: AIIMS Jodhpur SNO-2023

Explanation

• The patient's presentation aligns with the classic signs of acute glomerulonephritis, specifically the nephritic syndrome triad: hematuria (blood in urine), edema (facial swelling), and hypertension (high blood pressure).
• The recent history of a streptococcal throat infection, confirmed by an elevated anti-streptolysin O (ASO) titer, is the hallmark trigger for Acute Post-Streptococcal Glomerulonephritis (APSGN).
• Laboratory findings of increased Blood Urea Nitrogen (BUN) and creatinine levels (azotemia) confirm the presence of acute kidney injury resulting from glomerular inflammation.
• This condition is most common in children aged 5-12 years, which matches the patient's demographic.

Why Other Options Were Wrong

• Option A: Polycystic kidney disease is a chronic, inherited condition characterized by the growth of numerous cysts in the kidneys. It does not present as an acute illness following a bacterial infection.
• Option B: The defining feature of nephrotic syndrome is massive proteinuria (protein in the urine), leading to low blood albumin and severe, generalized edema. While edema is present in this case, the dominant features are hematuria and significant hypertension, which are characteristic of nephritic syndrome.
• Option D: Haemolytic uremic syndrome (HUS) is characterized by a specific triad: microangiopathic hemolytic anemia (destruction of red blood cells), thrombocytopenia (low platelets), and acute kidney injury. It is most often preceded by a diarrheal illness caused by E. coli, not a streptococcal throat infection.

Related Visual

• Visual 1: Diagram - Pathophysiology of Post-Streptococcal Glomerulonephritis. This visual would illustrate how immune complexes (formed in response to streptococcal antigens) deposit in the glomeruli, causing inflammation and damage that leads to the clinical signs.
• Visual 2: Comparison Table - Nephritic vs. Nephrotic Syndrome. A side-by-side table highlighting the key differences in clinical features (hematuria, proteinuria, blood pressure, edema) and lab values (serum albumin) would clarify the distinction.

Clinical Relevance

• Nursing practice connection: Knowing Diagnosis of Acute Post-Streptococcal Glomerulonephritis (APSGN) based on clinical presentation and laboratory findings helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
• The most critical nursing responsibility is monitoring for and managing severe hypertension and fluid overload, as these can lead to life-threatening complications like hypertensive encephalopathy and acute heart failure.
• Patient and family education is vital. Nurses must explain the importance of dietary restrictions (low salt, possibly fluid restriction), medication adherence, and the need for follow-up to monitor for resolution.
• What if? If the child's blood pressure was normal and the urinalysis showed massive proteinuria (4+) instead of gross hematuria, the diagnosis would shift towards Nephrotic Syndrome. The management would then focus on corticosteroid therapy to reduce proteinuria, rather than primarily managing hypertension.

How to Approach the Question

• First, analyze the patient's history. A 5-year-old with a recent 'streptococcal throat infection' is a major clue pointing towards a post-infectious complication.
• Next, cluster the key clinical findings. The patient has periorbital edema, hematuria, and hypertension (156/98 mmHg). Recognize this as the classic triad of nephritic syndrome.
• Correlate the laboratory results with the clinical picture. The increased ASO titer confirms the streptococcal trigger, and the elevated BUN and creatinine confirm acute kidney injury.
• Finally, evaluate the options. Glomerulonephritis is the term for inflammation of the glomeruli, which causes nephritic syndrome. This diagnosis perfectly matches the entire clinical scenario, including the post-streptococcal trigger.
• Eliminate the other options based on their defining characteristics: Polycystic disease is chronic/genetic, Nephrotic syndrome is defined by massive proteinuria, and HUS involves anemia/thrombocytopenia after diarrhea.

Concept Tested & Keywords

• Concept Tested: Diagnosis of Acute Post-Streptococcal Glomerulonephritis (APSGN) based on clinical presentation and laboratory findings.
• Stem keywords: 5-year-old, streptococcal throat infection, periorbital oedema, decreased urine output, haematuria, hypertension, increased blood urea nitrogen, creatinine
• Lead-in keywords: probable diagnosis
• Clinical cues: The combination of a recent streptococcal infection with the triad of hematuria, edema, and hypertension is the classic presentation for APSGN.

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