Dengue with warning signs on day five, with no platelet service overnight
A 27-year-old man presents on day five of fever with severe abdominal pain, persistent vomiting, and gum bleeding after brushing his teeth. Temperature is 38.4 degrees Celsius, pulse 112/min, blood pressure 100/70 mmHg, and capillary refill is three seconds. The tourniquet test is positive. Haematocrit is 52 percent against a recorded baseline of 44 percent at a prior visit; platelets are 38,000/microlitre and white cell count 3,800/microlitre. He is alert, has no pleural effusion on chest radiograph, and his urine output is 0.5 mL/kg/hour. The hospital has no platelet transfusion service after 8 pm and no intensive care bed. The medical officer must decide admission, fluid strategy, and whether to arrange transfer.
1. Classify this patient and decide the disposition.
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This is dengue with warning signs in the critical phase, with evidence of plasma leakage. The rising haematocrit of 52 percent from a baseline of 44 percent is a rise of about 18 percent, which meets the threshold for significant haemoconcentration. The severe abdominal pain, persistent vomiting, mucosal bleeding and positive tourniquet test are all warning signs.
The pulse of 112/min with a blood pressure of 100/70 mmHg and capillary refill of three seconds suggests compensated shock; the pulse pressure is narrow at 30 mmHg. He is not hypotensive yet, but he is on the edge.
Admit him for intravenous fluid therapy and hourly monitoring. Do not send him home, and do not rely on the platelet count alone to decide admission; the haematocrit trend and the clinical signs are more important. Because there is no ICU bed and no platelet service overnight, I would arrange transfer to a facility with critical care if his observations do not improve after the first hour of fluid, or if he develops hypotension, altered consciousness, or significant bleeding. Start treatment first and transfer as a stabilized patient, not as a resuscitation outside the hospital.
2. Write the initial fluid plan and the monitoring that goes with it.
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Use isotonic crystalloid, such as 0.9% sodium chloride or Ringer's lactate, and titrate to the clinical response rather than to a fixed volume.
- Start at 5-7 mL/kg/hour for the first 1-2 hours.
- If the vital signs and perfusion improve, reduce to 3-5 mL/kg/hour for 2-4 hours, then to 2-3 mL/kg/hour.
- If there is no improvement, or if the haematocrit is rising with ongoing leakage, increase cautiously rather than giving repeated large boluses.
- Give a bolus of 10-20 mL/kg only if he becomes hypotensive or clearly shocked.
Monitor and record hourly: pulse, blood pressure, pulse pressure, capillary refill, urine output (target 0.5-1 mL/kg/hour), haematocrit, and conscious level. Stop or slow the fluids if the haematocrit falls without bleeding, if there are crepitations, or if the urine output is excessive, because these suggest over-hydration and pulmonary oedema.
The reasoning is that the critical phase is short, usually 24-48 hours, and the danger is both under-resuscitation during leakage and over-resuscitation after it. The haematocrit is the bedside guide to which direction you are heading.
3. Should this patient receive platelets, and what else must be avoided?
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No prophylactic platelet transfusion. The platelet count of 38,000/microlitre is low but not in the range where prophylactic transfusion is recommended, and gum bleeding after brushing is usually minor mucosal bleeding that does not require platelets. Transfusion is indicated for significant bleeding, such as haematemesis, melaena, heavy vaginal bleeding, or intracranial haemorrhage, or for a platelet count below 10,000-20,000/microlitre with additional risk, according to local protocol. Giving platelets prophylactically in dengue can worsen volume overload and does not reliably prevent bleeding.
Avoid the following:
- NSAIDs and aspirin, because they impair platelet function and increase bleeding.
- Intramuscular injections, because of bleeding risk and because they are unnecessary.
- Unnecessary venepuncture; use a single cannula and gentle pressure.
Check the haematocrit and vital signs frequently, and watch for the transition into the recovery phase, when the haematocrit falls and fluids must be reduced to avoid pulmonary oedema. Document the platelet count and bleeding status at each review, and escalate immediately if there is any major bleeding.