A 2-year-old boy from rural Bihar is brought to the pediatric outpatient department by his mother with complaints of poor weight gain and recurrent infections over the past 6 months. On examination, he weighs 9 kg (expected 12–14 kg for age), height 80 cm, appears apathetic, and has sparse, thin, depigmented hair. Skin turgor is poor but no significant edema is noted. Serum albumin is 2.8 g/dL, total protein 5.2 g/dL. What is the most likely diagnosis?

Explanation

## Clinical Diagnosis: Marasmus ### Key Features in This Case **Key Point:** Marasmus is characterized by **severe wasting** (weight-for-age <60% of expected), **absence of edema**, and **preserved serum albumin** (relatively) compared to kwashiorkor. This child shows classic marasmic features. ### Distinguishing Features of Protein-Energy Malnutrition Subtypes | Feature | Marasmus | Kwashiorkor | Marasmic Kwashiorkor | |---------|----------|-------------|----------------------| | **Weight-for-age** | <60% expected | 60–80% expected | <60% with edema | | **Edema** | Absent | Present (pitting) | Present | | **Hair changes** | Sparse, thin, depigmented | Sparse, thin, "flag sign" | Both present | | **Skin changes** | Loose, wrinkled | Dermatitis, hyperpigmentation | Both | | **Serum albumin** | Low but relatively preserved | Severely low (<2.0 g/dL) | Very low | | **Onset** | Gradual (months) | Acute (weeks) | Variable | | **Apathy/irritability** | Marked apathy | Irritability common | Both | | **Metabolic rate** | Decreased | Relatively preserved | Decreased | ### Why This Child Has Marasmus 1. **Severe wasting:** 9 kg vs. expected 12–14 kg = ~64% of expected weight → **primary protein-energy deficit** 2. **No edema:** Rules out kwashiorkor and marasmic kwashiorkor 3. **Sparse, depigmented hair:** Indicates chronic protein deficiency 4. **Apathy:** Typical of marasmus (not irritability as in kwashiorkor) 5. **Serum albumin 2.8 g/dL:** Low but not severely depleted (kwashiorkor would be <2.0 g/dL) 6. **Gradual onset over 6 months:** Consistent with marasmus; kwashiorkor is usually acute **High-Yield:** Marasmus = **wasting without edema**; Kwashiorkor = **edema with relative preservation of weight**. ### Pathophysiology **Clinical Pearl:** In marasmus, the body adapts to chronic caloric deprivation by: - Reducing metabolic rate and energy expenditure - Mobilizing fat stores (hence the "skin and bones" appearance) - Preserving visceral proteins initially (hence albumin not as low as in kwashiorkor) - Resulting in apathy and lethargy to conserve energy In contrast, kwashiorkor occurs when protein intake is severely restricted but carbohydrate intake is adequate, leading to: - Preserved or even normal weight - Severe visceral protein depletion (albumin <2.0 g/dL) - Edema due to oncotic pressure loss - Irritability and behavioral changes ### Management Principles Marasmic children require **gradual refeeding** with careful monitoring: - Start with small, frequent feeds - Avoid refeeding syndrome (hypophosphatemia, hypokalemia, hypomagnesemia) - Micronutrient supplementation (vitamins A, D, zinc, iron) - Treat concurrent infections - Psychosocial support and developmental stimulation [cite:Park 26e Ch 9]