A 2-year-old boy from rural Uttar Pradesh presents with severe wasting, loss of subcutaneous fat, and skin changes. On examination, he has a moon facies, sparse and depigmented hair, and hepatomegaly. Laboratory investigations show low serum albumin and normal blood glucose. What is the most common form of protein-energy malnutrition in this clinical presentation?

## Clinical Diagnosis: Kwashiorkor **Key Point:** Kwashiorkor is characterized by **protein deficiency with relatively preserved caloric intake**, leading to edema, hepatomegaly, and skin/hair changes despite preserved body weight. ### Clinical Features of Kwashiorkor The patient presents with the classic triad: 1. **Edema** — bilateral, pitting, often masked by wasting 2. **Hepatomegaly** — due to fatty infiltration from impaired protein synthesis 3. **Skin and hair changes** — depigmentation, dyspigmentation ("crazy pavement" skin), sparse/brittle hair, peeling dermatitis Additional findings: - Moon facies (facial edema) - Preserved or near-normal weight (distinguishes from marasmus) - Normal or elevated blood glucose (protein deficiency does not impair gluconeogenesis as severely) - Low serum albumin and other plasma proteins - Immune dysfunction → increased infection risk ### Differential Features: Kwashiorkor vs. Marasmus | Feature | Kwashiorkor | Marasmus | |---------|-------------|----------| | **Primary deficiency** | Protein | Calories (overall) | | **Weight** | Preserved or near-normal | Severely reduced (< 60% ideal) | | **Edema** | Present (bilateral, pitting) | Absent | | **Hepatomegaly** | Present (fatty) | Absent | | **Skin changes** | Dermatitis, depigmentation, peeling | Dry, loose, wrinkled | | **Hair** | Sparse, depigmented, brittle | Thin, sparse | | **Serum albumin** | Low | Low | | **Blood glucose** | Normal or elevated | Low | | **Onset** | Acute (weeks to months) | Chronic (months to years) | **Clinical Pearl:** The presence of **edema + hepatomegaly + preserved weight + hair/skin changes** is pathognomonic for kwashiorkor. The edema masks the underlying wasting, which is why patients may appear "plump" despite malnutrition. **High-Yield:** Kwashiorkor is the most common form of severe PEM in **developing countries with adequate carbohydrate but inadequate protein intake** — typical in children weaned onto starch-based diets (rice, cassava) with minimal protein sources. This is the epidemiology in rural India. ### Pathophysiology 1. **Protein deficiency** → ↓ plasma protein synthesis (especially albumin) 2. **Hypoalbuminemia** → ↓ plasma oncotic pressure → edema 3. **Impaired hepatic protein synthesis** → fatty infiltration (hepatomegaly) 4. **Impaired immune function** → increased susceptibility to infection 5. **Preserved carbohydrate intake** → maintains blood glucose and energy for some functions