Which of the following clinical signs is pathognomonic for kwashiorkor and distinguishes it from marasmus?

Explanation

## Kwashiorkor vs. Marasmus: Distinguishing Features **Key Point:** Bilateral pitting edema (especially of the legs and face) and hepatomegaly are the hallmark signs of kwashiorkor that differentiate it from marasmus. These occur despite low body weight and indicate severe protein deficiency with relative carbohydrate availability. ### Comparative Clinical Features | Feature | Kwashiorkor | Marasmus | |---------|-------------|----------| | **Edema** | **Present (bilateral, pitting)** | Absent | | **Hepatomegaly** | **Present (fatty infiltration)** | Absent | | **Body weight** | 60–80% of expected | <60% of expected | | **Subcutaneous fat** | Preserved initially | Severely depleted | | **Muscle mass** | Relatively preserved | Severely wasted | | **Hair changes** | Flag sign (depigmentation) | Sparse, thin | | **Skin changes** | Dermatitis, peeling (flaky paint sign) | Loose, wrinkled | | **Immune status** | Severely impaired | Relatively better | | **Prognosis** | Higher mortality if untreated | Better with refeeding | **High-Yield:** The edema in kwashiorkor is due to: 1. Decreased plasma oncotic pressure (↓ albumin synthesis) 2. Increased capillary permeability (cytokine-mediated) 3. Sodium retention (↑ aldosterone, ↓ renal perfusion) ### Pathophysiology **Clinical Pearl:** Kwashiorkor typically occurs when a child transitions from breast milk to a starch-based diet with minimal protein. The relative availability of carbohydrates suppresses lipolysis, preserving subcutaneous fat and allowing edema formation—a paradoxical finding that clinically distinguishes it from marasmus. **Mnemonic:** **KEDS** — Kwashiorkor = Edema, Dermatitis, Starch-based diet.