# A 7-year-old child is admitted to the pediatric unit with suspected acute post-streptococcal glomerulonephritis. Which assessment finding would be most indicative of this condition?

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> subject: Adult Health

## 문제

A 7-year-old child is admitted to the pediatric unit with suspected acute post-streptococcal glomerulonephritis. Which assessment finding would be most indicative of this condition?

The nurse is conducting an initial assessment on a pediatric patient with potential glomerulonephritis.

## 보기

1. Periorbital edema and cola-colored urine **✔ 정답**
2. Frequent urination with burning sensation
3. Flank pain with high fever
4. Abdominal distension with vomiting

**정답: 1**

## 해설

Periorbital edema and cola-colored urine are classic signs of acute post-streptococcal glomerulonephritis, indicating fluid retention and glomerular damage. Other options suggest urinary tract infection, pyelonephritis, or gastrointestinal issues, which are less specific for glomerulonephritis.

## 심화 해설

Understanding the Pathophysiology

Acute post-streptococcal glomerulonephritis (APSGN) is an immune-complex mediated condition. It does not occur during the acute infection with Group A Streptococcus (GAS), but rather 1 to 6 weeks after a pharyngeal or skin infection. During this latent period, the body produces antibodies that form complexes with streptococcal antigens. These complexes deposit in the glomerular basement membrane, triggering complement activation and local inflammation [1]. This inflammatory process damages the glomerular capillary walls, leading to a characteristic clinical picture.

Why Option 1 is the Most Indicative Finding

The correct answer is Periorbital edema and cola-colored urine. This combination directly reflects the underlying glomerular injury. The damaged glomeruli allow red blood cells (RBCs) to leak into the urine; as these RBCs are trapped in the acidic environment of the renal tubules and break down, they produce a distinctive dark, cola- or tea-colored urine, which is a classic sign of hematuria in glomerulonephritis [1, 3]. Simultaneously, the inflamed glomeruli reduce the kidney's ability to filter sodium and water, leading to fluid retention. This excess fluid first accumulates in loose connective tissues, most noticeably around the eyes, causing periorbital edema. The presence of these two signs together is highly specific for acute nephritic syndrome, of which APSGN is the most common cause in children aged 5 to 15 years [1, 2].

Analysis of Incorrect Options

-   Option 2: Frequent urination with burning sensation. This presentation is classic for a lower urinary tract infection (UTI) or cystitis, not glomerulonephritis. While APSGN can cause oliguria due to reduced glomerular filtration, it does not typically cause dysuria or urinary frequency.

-   Option 3: Flank pain with high fever. This points toward an acute infectious or obstructive process like pyelonephritis or a kidney stone. APSGN is an immunologic sequela, not an active bacterial infection of the kidney, so high fever is not a primary characteristic. The inflammation is sterile and immune-mediated [1].

-   Option 4: Abdominal distension with vomiting. While fluid overload from APSGN can cause generalized edema, including ascites, these gastrointestinal symptoms are nonspecific. They do not provide the key diagnostic clues of glomerular hematuria and characteristic edema location that are central to identifying a glomerular origin of the disease.

Key Diagnostic and Assessment Points

In the clinical setting, your assessment should focus on confirming the triad of acute nephritic syndrome. Beyond the visible signs of periorbital edema and cola-colored urine, you must assess for hypertension, which results from fluid overload and is a critical finding that can lead to hypertensive encephalopathy if untreated [1]. You would also anticipate laboratory findings that support the diagnosis, such as a urinalysis showing nephritic sediment (dysmorphic RBCs and RBC casts) and blood tests revealing a low serum complement C3 level, which is a hallmark of the intense immune activation in APSGN [1, 3]. The C3 level returns to normal within 6 to 8 weeks, a key point for differentiating APSGN from other chronic glomerular diseases. An elevated antistreptolysin O (ASO) titer confirms a recent streptococcal infection, but a negative titer does not rule out the disease if the infection was cutaneous [1].References (research sources)

- [1]Acute Post-Streptococcal Glomerulonephritis in a 22-Month-Old Toddler: A Rare and Uncustomary Age of Onset.Research articleAkeberegn AB, Bizuneh AA. (2025) · DOI: 10.1002/ccr3.70861

## 임상 시나리오

Recognizing Acute Post-Streptococcal GlomerulonephritisKey Assessment Findings in Pediatric Patients
Suspect APSGN in children aged 5 to 15 years presenting with a history of a recent streptococcal infection (1 to 6 weeks prior). The hallmark clinical picture is the sudden onset of periorbital edema and cola-colored urine.

The dark urine results from glomerular hematuria, where red blood cells leak through damaged capillary walls and degrade in the renal tubules. The edema is a consequence of sodium and water retention due to a reduced glomerular filtration rate.

CautionDo not confuse this with a urinary tract infection. Burning on urination and frequency are not features of glomerulonephritis. Also, monitor for hypertension and oliguria, which are critical components of nephritic syndrome requiring immediate intervention.

## 핵심 개념

- **Acute Post-Streptococcal Glomerulonephritis (APSGN)** — An immune-complex mediated inflammation of the glomeruli occurring 1-6 weeks after a Group A Streptococcus infection, common in children aged 5-15.
- **Cola-Colored Urine** — A classic sign of glomerular hematuria where red blood cells leak through damaged glomeruli and degrade in the renal tubules, producing a dark brown or tea-like appearance.
- **Periorbital Edema** — Swelling around the eyes caused by fluid retention in loose connective tissues, a key early sign of sodium and water retention due to reduced glomerular filtration.
- **Nephritic Syndrome** — A clinical syndrome characterized by hematuria, mild to moderate proteinuria, hypertension, oliguria, and edema resulting from glomerular inflammation.
- **Immune-Complex Deposition** — The pathological process where antigen-antibody complexes deposit in the glomerular basement membrane, activating the complement system and causing local tissue damage.

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