A 18-month-old girl from an urban slum in Delhi is brought by her mother with severe wasting and a 4-month history of diarrhea. Weight is 7.5 kg (expected 11 kg), height 75 cm (expected 82 cm). Skin is loose and wrinkled ('old man' appearance). No edema or hepatomegaly is noted. Serum albumin is 3.2 g/dL, and total serum protein is 5.8 g/dL. The child is alert and playful. What is the most likely nutritional diagnosis?

Explanation

## Clinical Diagnosis: Marasmus ### Key Clinical Features Present **Key Point:** Marasmus is total caloric deficiency (both protein and carbohydrate/fat), presenting with severe wasting, loss of subcutaneous fat and muscle, but NO edema, NO hepatomegaly, and relatively preserved serum albumin. This child exhibits the classic features of marasmus: | Feature | Finding in This Case | Significance | |---------|----------------------|--------------| | **Severe wasting** | Weight 68% of expected (7.5/11) | Hallmark | | **Height deficit** | 75 cm (91% of expected) | Chronic malnutrition | | **Skin appearance** | Loose, wrinkled ('old man' look) | Loss of subcutaneous fat and elasticity | | **Absence of edema** | None noted | Distinguishes from kwashiorkor | | **No hepatomegaly** | Absent | Albumin synthesis preserved | | **Serum albumin** | 3.2 g/dL (normal-low) | Relatively preserved due to protein catabolism | | **Mental status** | Alert and playful | No severe systemic toxicity | | **Chronic diarrhea** | 4 months | Suggests chronic caloric loss | ### Pathophysiology of Marasmus 1. **Total caloric deficit** → mobilization of all energy stores (fat, muscle, protein) 2. **Selective protein catabolism** → maintains serum albumin by breaking down muscle 3. **Loss of subcutaneous fat** → characteristic wrinkled, loose skin 4. **Preserved liver function** → no hepatomegaly, albumin synthesis continues 5. **Absence of third-spacing** → no edema (osmotic pressure maintained) **Clinical Pearl:** In marasmus, the body "eats itself" proportionally — muscle wasting and fat loss are severe, but serum albumin is relatively spared because the liver preferentially synthesizes albumin at the expense of skeletal muscle. This is why albumin >3.0 g/dL in a severely wasted child suggests marasmus, not kwashiorkor. ### High-Yield Distinguishing Features **High-Yield:** - **Marasmus** = severe wasting (weight-for-age <60%, weight-for-height <70%) + NO edema + NO hepatomegaly + albumin >3.0 g/dL - **Kwashiorkor** = moderate wasting + edema + hepatomegaly + albumin <2.5 g/dL **Mnemonic:** **MARASMUS** = **M**uscle **A**nd fat **R**educed, **A**lbumin **S**pared, **M**inimal edema, **U**nder-weight, **S**evere wasting ### Why Albumin Is Preserved in Marasmus The liver maintains albumin synthesis by: - Catabolizing muscle protein (amino acid pool) - Prioritizing albumin over other proteins - Responding to stress hormones (cortisol) that drive muscle breakdown Result: Serum albumin remains 3.0–3.5 g/dL despite severe total protein malnutrition. [cite:Park 26e Ch 9; Ghai Essential Pediatrics 9e Ch 5]