A 5-year-old girl from Chennai is on day 5 of dengue fever. She now has tachycardia (HR 120/min), systolic BP 90 mmHg (baseline ~105 mmHg), weak pulses, delayed capillary refill (3 seconds), and cold extremities. Haematocrit has risen from 35% to 48%. Platelet count is 45,000/μL. She is restless and has passed minimal urine in the last 4 hours. What is the most appropriate immediate next step?

Explanation

## Clinical Context: Dengue Shock Syndrome (DSS) This child has **dengue shock syndrome (Grade IV DHF)** with: - Hypotension (SBP 90 mmHg, <5th percentile for age) - Narrow pulse pressure (tachycardia + low BP) - Poor perfusion (weak pulses, delayed capillary refill, cold extremities) - Oliguria (sign of inadequate perfusion) - Haematocrit rise ≥20% (plasma leakage) - Severe thrombocytopenia (45,000/μL) ## Immediate Management Algorithm ```mermaid flowchart TD A[Dengue Shock Syndrome]:::urgent --> B[Oxygen + IV access]:::action B --> C[Ringer's lactate 10 mL/kg bolus]:::action C --> D[Reassess after 15-30 min]:::decision D -->|Shock reversed| E[Continue maintenance + monitoring]:::action D -->|Shock persists| F[Repeat bolus 10 mL/kg]:::action F --> G{Response?}:::decision G -->|Yes| H[Slow infusion, monitor urine output]:::action G -->|No| I[Add vasopressor + ICU transfer]:::urgent I --> J[Dopamine 5-10 mcg/kg/min]:::action ``` **Key Point:** Fluid resuscitation is the PRIMARY treatment for dengue shock. IV fluids must be started immediately without delay for investigations. **High-Yield:** The "golden rule" of dengue shock management: 1. **First bolus:** 10 mL/kg Ringer's lactate over 15 minutes 2. **Reassess:** If shock persists, repeat bolus once 3. **If still in shock after 2 boluses:** Add vasopressor (dopamine) and ICU care ## Why NOT Platelet Transfusion First? **Clinical Pearl:** Platelet transfusion in dengue shock WITHOUT active bleeding is CONTRAINDICATED because: - Transfused platelets are rapidly consumed by the dengue pathology - Increases thrombotic complications (DIC risk) - Delays definitive fluid resuscitation - Indicated ONLY if platelet count <10,000/μL WITH bleeding, or active hemorrhage In this case, despite low platelets, there is no mention of bleeding — shock is from plasma leakage, not hemorrhage. **Mnemonic: FLUIDS FIRST in DSS** — Fluids (Ringer's lactate), Liter-based dosing (10 mL/kg), Urgent bolus, IV access, Dopamine if needed, Shock reversal goal, First-line therapy. ## Reassessment Parameters | Parameter | Goal After Fluid Bolus | |-----------|------------------------| | Systolic BP | Rise by ≥10 mmHg | | Pulse rate | Decrease | | Capillary refill | <2 seconds | | Urine output | >0.5 mL/kg/hr | | Extremities | Warm, well-perfused | | Sensorium | Alert, responsive | **Warning:** Over-resuscitation with fluids leads to pulmonary edema and ARDS — the most common cause of death in dengue. Use the minimum fluid needed to reverse shock, then slow the infusion rate. [cite:Park 26e Ch 7; WHO Dengue Management 2009]