Fluid Resuscitation Guidelines for Dengue Fever with Warning Signs or Plasma Leakage

Initial Fluid Choice

Initial Bolus and Volume Targets

Use of Colloids

Clinical Monitoring and Reassessment

• Normal capillary refill time (< 2–3 s in adults, < 4.5 s in the elderly) and
• Absence of skin mottling, warm‑dry extremities, palpable peripheral pulses, return to baseline mental status, and urine output ≥ 0.5 mL /kg/h (adults) or ≥ 1 mL /kg/h (children). (Moderate‑quality evidence) 4

Management of Patients Without Shock

Vasopressor Support When Fluids Are Insufficient

Initial Fluid Resuscitation and Vasopressor Management for Dengue‑Associated Hypotension

Fluid Resuscitation

• Administer an initial isotonic crystalloid bolus of 20 mL/kg (saline or Ringer’s lactate) to dengue patients presenting with hypotension, and reassess clinical response after each bolus; if shock persists despite adequate fluid resuscitation, start norepinephrine as the first‑choice vasopressor. 7
• Reevaluate the patient after every fluid bolus to detect early deterioration and avoid fluid overload. 8

Vasopressor Therapy

• Target a mean arterial pressure (MAP) of at least 65 mmHg in patients with fluid‑refractory hypotension. [7][9]
• Norepinephrine is the preferred first‑line vasopressor; epinephrine may be added only if additional support is required, but it can worsen lactic acidosis, making norepinephrine the safer option. 7
• Dopamine can be considered as an alternative vasopressor only in highly selected patients who have a low risk of tachyarrhythmias and who exhibit absolute or relative bradycardia. 7
• Vasopressors may be administered through peripheral veins when central venous access is unavailable, provided that close monitoring for extravasation and local tissue necrosis is performed; infusion must be stopped immediately if extravasation occurs. 9

Monitoring and Pitfalls

• Do not give routine bolus intravenous fluids to dengue patients who are not in shock, especially in resource‑limited settings lacking mechanical ventilation or inotropic support. 10
• Monitor for signs of fluid overload—including elevated jugular venous pressure, new crackles/rales on lung auscultation, and decreasing oxygen saturation—to prevent pulmonary edema and related complications. 11

Dengue Shock Syndrome: Diagnostic Criteria, Risk Factors, and Monitoring

Definition and Core Hemodynamic Criteria

• Dengue shock syndrome is diagnosed when a patient meets all dengue hemorrhagic fever criteria plus either systolic blood pressure < 90 mm Hg (or age‑appropriate hypotension) or a pulse pressure ≤ 20 mm Hg; onset typically occurs between days 4‑6 of illness. [12][13]

Evidence of Plasma Leakage

• A rise in hematocrit of ≥ 20 % above baseline indicates significant plasma leakage and fulfills a key DSS requirement. [12][13]

Hematologic Findings

• Platelet count ≤ 100,000 /mm³ is a common laboratory abnormality in DSS. [12][13]

Renal Perfusion Indicator

• Oliguria (urine output < 0.5 mL kg⁻¹ h⁻¹ in adults or < 1 mL kg⁻¹ h⁻¹ in children) signals inadequate tissue perfusion and should prompt urgent evaluation. 14

High‑Risk Patient Characteristics

• Age extremes increase the risk of severe outcomes: pediatric patients have higher rates of cardiac complications, while older adults experience greater mortality. [15][16]

Cardiac Complications (Critical Pitfalls)

• Cardiac involvement—including arrhythmias, myocarditis, and pericarditis—occurs in 12 %–50 % of hospitalized dengue patients and is frequently under‑diagnosed. [15][16]

Monitoring for Disease Progression

• Serial hematocrit measurements: a rising trend indicates ongoing plasma leakage and warrants escalation of care. 12
• Urine output monitoring: decreasing output serves as a bedside marker of deteriorating end‑organ perfusion. 14

Hemodynamic Monitoring in Pediatric Dengue

Blood Pressure and Shock Recognition

• In children with dengue, systolic blood pressure often remains normal because compensatory vasoconstriction and tachycardia mask early plasma leakage; hypotension typically appears only at the moment of cardiovascular collapse, underscoring the need for vigilant monitoring of other shock indicators rather than waiting for low blood pressure to develop. 17