A 2-year-old girl from urban Delhi is brought to the emergency department with a 2-day history of acute watery diarrhea (6–8 stools/day) and mild vomiting. On examination: alert and playful, eyes normal, oral mucous membranes slightly dry, skin turgor normal, capillary refill <2 seconds. Weight before illness was 14 kg; current weight is 13.6 kg. Serum electrolytes: Na⁺ 138 mEq/L, K⁺ 3.8 mEq/L, Cl⁻ 102 mEq/L, HCO₃⁻ 20 mEq/L. Urine output is adequate. What is the most appropriate management?

Explanation

## Clinical Assessment **Dehydration Severity:** - Weight loss: (14 − 13.6) / 14 × 100 = 2.9% → **mild dehydration** (<5%) - Clinical signs: alert, playful, normal eyes, slightly dry mucous membranes, normal skin turgor, normal capillary refill - Adequate urine output - **Classification: MILD DEHYDRATION with NO SHOCK** **Electrolyte & Acid–Base Status:** - Na⁺ 138 mEq/L → **normal** (135–145) - K⁺ 3.8 mEq/L → **normal** (3.5–5.0) - HCO₃⁻ 20 mEq/L → **mild metabolic acidosis** (normal 22–26, but not severe) - **Isotonic dehydration** (sodium and water losses proportional) ## Management of Mild Dehydration **Key Point:** WHO and Indian Academy of Pediatrics (IAP) guidelines recommend **ORT as first-line therapy** for mild-to-moderate dehydration in children with acute diarrhea, even with mild vomiting, provided the child can tolerate oral intake. **High-Yield:** Low-osmolarity ORS (glucose-to-sodium ratio 1:1, osmolarity 245 mOsm/L) reduces stool output by ~30% compared to standard ORS and decreases hypernatremia risk. **Mnemonic: ORAL FIRST — O**ral rehydration therapy, **R**eassess hydration status, **A**llow age-appropriate diet, **L**ow-osmolarity solution **Clinical Pearl:** Continuing an age-appropriate diet (cereals, fruits, vegetables, lean protein) during diarrhea reduces the duration of illness and improves nutritional recovery. The outdated "NPO" approach delays recovery and is no longer recommended. **Management Algorithm:** ```mermaid flowchart TD A[Acute diarrhea + dehydration]:::outcome --> B{Severity?}:::decision B -->|Mild| C[ORT with low-osmolarity solution]:::action B -->|Moderate| D{Tolerating oral intake?}:::decision B -->|Severe/Shock| E[IV rehydration + ICU]:::urgent C --> F[Continue age-appropriate diet]:::action D -->|Yes| C D -->|No/Vomiting| G[IV rehydration: 0.9% saline bolus]:::action C --> H[Reassess in 4 hours]:::action G --> I[Switch to ORT once stable]:::action H --> J{Improved?}:::decision J -->|Yes| K[Discharge with counseling]:::outcome J -->|No| L[Admit for IV therapy]:::action ``` ## Why This Answer This child has **mild dehydration with isotonic electrolyte losses and adequate perfusion**. ORT is the gold standard and is effective in >90% of mild-to-moderate dehydration cases. Continuing a normal diet (not NPO) shortens illness duration and prevents malnutrition. Reassessment in 4 hours allows early detection of treatment failure and escalation to IV therapy if needed.