Below is a clear, physician-style explanation of fluid management in dengue, which is the most critical aspect of treatment. I’ll keep it practical and easy to understand.
Why fluid management is crucial in dengue
Dengue causes increased capillary permeability, especially during the critical phase. Plasma leaks from blood vessels into tissues, leading to:
- Reduced circulating volume (shock risk)
- Hemoconcentration
- Organ hypoperfusion
⚠️ There is no antiviral treatment for dengue — correct fluid therapy saves lives.
Phases of dengue & fluid strategy
1️⃣ Febrile Phase (Day 1–3)
What happens
- High fever
- Vomiting
- Poor oral intake
- No plasma leakage yet
Fluid management
- Encourage oral fluids (ORS, water, soups)
- IV fluids only if:
- Persistent vomiting
- Unable to drink
- Signs of dehydration
Goal: Prevent dehydration
❌ Avoid aggressive IV fluids
2️⃣ Critical Phase (Day 3–6) ⚠️ MOST IMPORTANT
This phase starts around defervescence (fever settling).
What happens
- Plasma leakage
- Rising hematocrit
- Falling platelet count
- Risk of dengue shock syndrome
Key principles
- Use isotonic crystalloids (Normal Saline or Ringer’s Lactate)
- Give the minimum fluid needed to maintain circulation
- Adjust fluids based on clinical response
Monitoring parameters
- Vital signs (pulse, BP, pulse pressure)
- Capillary refill time
- Urine output (target ≥ 0.5 ml/kg/hr in adults)
- Hematocrit (HCT)
- Mental status
Fluid adjustment logic (very important)
🟢 If patient is stable
- Continue maintenance or slightly increased IV fluids
- Monitor closely every 1–4 hours
🔴 If patient shows shock signs
(signs: narrow pulse pressure, cold extremities, delayed capillary refill)
- Give fluid bolus
- Reassess after each bolus
- If HCT is high → continue crystalloids
- If HCT is low or falling with instability → suspect bleeding
❌ Colloids are reserved only if crystalloids fail
3️⃣ Recovery Phase (Day 6–8)
What happens
- Plasma re-enters circulation
- Diuresis starts
- Appetite improves
Fluid management
- Reduce IV fluids
- Stop IV fluids as early as possible
- Watch for fluid overload
⚠️ Signs of overhydration:
- Facial puffiness
- Respiratory distress
- Crepitations in lungs
- Rising blood pressure
What to AVOID in dengue fluid management ❌
- Overhydration (very dangerous)
- Hypotonic fluids
- NSAIDs (ibuprofen, diclofenac, aspirin)
- Unnecessary platelet transfusions
- Fixed fluid rates without reassessment