A 7-year-old boy from Delhi presents with fever, myalgia, and headache for 4 days. On examination, he has a maculopapular rash sparing palms and soles, hepatomegaly (2 cm below costal margin), and mild abdominal tenderness. Laboratory findings: WBC 3.2 × 10⁹/L, platelets 95 × 10⁹/L, hematocrit 38%, AST 120 IU/L, ALT 95 IU/L, albumin 3.2 g/dL. Dengue IgM ELISA is positive. On day 5 of illness, his fever defervesces but he develops restlessness, cold extremities, and a capillary refill time of 3 seconds. Blood pressure is 88/56 mmHg. What is the most appropriate immediate management?

## Clinical Presentation & Diagnosis This child has **dengue hemorrhagic fever (DHF) with dengue shock syndrome (DSS)**. The key diagnostic features are: - **Fever followed by defervescence** (critical phase begins at day 5–6) - **Thrombocytopenia** (95 × 10⁹/L) with **hemoconcentration** (hematocrit 38% is elevated for age) - **Hepatomegaly** and **transaminitis** (AST > ALT) - **Plasma leakage signs**: cold extremities, delayed capillary refill, hypotension (88/56 mmHg) - **Positive dengue serology** (IgM ELISA) ## Pathophysiology of Dengue Shock Syndrome **Key Point:** DSS occurs during the critical phase (days 3–7) when viral replication peaks and immune-mediated plasma leakage is maximal. This is NOT primarily hemorrhage but **capillary permeability crisis** leading to hypovolemic shock. ## Management of DSS ```mermaid flowchart TD A[Dengue Shock Syndrome]:::urgent --> B{Perfusion status?}:::decision B -->|Signs of shock| C[Bolus 20 mL/kg NS IV over 15 min]:::action C --> D[Reassess perfusion]:::decision D -->|Improved| E[Maintenance fluids + monitoring]:::action D -->|Persistent shock| F[Repeat bolus 15 mL/kg]:::action F --> G[Consider ICU/vasopressors]:::action B -->|Compensated| E ``` **High-Yield:** The WHO 2009 dengue management algorithm mandates: 1. **First bolus**: 20 mL/kg isotonic crystalloid (NS or RL) over **15 minutes** for shock 2. **Reassess** within 15–30 minutes 3. If shock persists → **second bolus** of 15 mL/kg 4. If shock continues → ICU, inotropes, and consider colloids **Clinical Pearl:** The critical phase is when **platelet count falls <100 × 10⁹/L** AND **hematocrit rises** (plasma leakage). This child meets both criteria. Transfusion is reserved for **active bleeding** (hematemesis, melena, petechiae progressing to purpura) — not for thrombocytopenia alone. ## Why Bolus Over Maintenance? **Key Point:** This child is in **hypovolemic shock** (hypotension, poor perfusion). Maintenance fluids (1.5× requirement ≈ 80–100 mL/kg/day) are insufficient to restore circulating volume acutely. A rapid bolus restores perfusion pressure and organ perfusion within minutes. [cite:Park 26e Ch 10, WHO Dengue Guidelines 2009]