A 40 yrs old patient with burn injury of 35% of TBSA brought for burn

A 40 yrs old patient with burn injury of 35% of TBSA brought for burn management 5 hours after the incident. 3.5 Liters of ringers lactate has been given in local hospital before transferring the patient according to the parkland formula BP-110/70 HR-104 UOP-15ml/hr over 2hrs What is the appropriate next management? A. Increase current infusion rate B. Continue current infusion rate C. Addacolloid infusion D. Start frusemide infusion E. Start small dose of Noradrenaline infusion

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Answer: A. Increase the current infusion rate

Step-by-step Clinical Reasoning

1. Calculate Total 24-hour Parkland Volume

Parkland formula: 4 mL × kg × %TBSA burned

Assuming a standard adult weight of ~70 kg:

4 × 70 × 35 = 9,800 mL (~9.8 L) over 24 hours

The first half (4,900 mL) should be given in the first 8 hours from the time of injury (not from the time of hospital arrival).

2. Account for Time Already Elapsed + Volume Already Given

The burn happened 5 hours ago
3.5 L (3,500 mL) has already been given
First 8-hour target volume = ~4,900 mL
Remaining volume to be delivered in the next 3 hours (to complete the first 8 hours) = 4,900 - 3,500 = 1,400 mL over 3 hours = ~467 mL/hr

The patient is behind on resuscitation and the infusion needs to be increased to "catch up" on the front-loaded first 8-hour volume.

3. Assess Adequacy via Urine Output (the Key Clinical Monitor)

Target UOP in adults: 0.5 to 1.0 mL/kg/hr

For a ~70 kg patient: target = 35-70 mL/hr

This patient's UOP = 15 mL/hr over 2 hours - this is far below the minimum target, confirming inadequate resuscitation.

As confirmed by Morgan & Mikhail's Clinical Anesthesiology (7th ed.):

"Both formulas use urine output as a reliable indicator of fluid resuscitation adequacy, targeting adult urine production of 0.5 to 1.0 mL/kg/h as indicators of adequate circulating volume."

The hemodynamics (BP 110/70, HR 104) show a compensated but relatively tachycardic state - HR > 100 despite normal BP is a warning sign, consistent with inadequate volume replacement.

4. Why the Other Options Are Wrong

Option	Why incorrect
B. Continue current rate	UOP of 15 mL/hr is well below target; continuing the same rate will perpetuate under-resuscitation
C. Add colloid	Colloid is not indicated in the first 24 hours of burn resuscitation. Colloid leak through "leaky capillaries" persists in the first 24 hours; crystalloid (Ringer's lactate) remains the standard. Colloid may be used in the second 24-hour period to restore plasma oncotic pressure - Sabiston states that "colloid solutions should not be used in the first 24 hours until capillary permeability returned closer to normal."
D. Furosemide	Absolutely contraindicated. UOP is already dangerously low (oliguria). Furosemide would worsen renal perfusion and precipitate acute kidney injury. It has no role unless there is actual fluid overload.
E. Noradrenaline	Vasopressors are not appropriate here. The problem is hypovolemia (burn shock with fluid deficit), not pump failure or vasodilatory shock. Pressors in the setting of under-resuscitation worsen end-organ ischemia.

Summary

The correct answer is A - Increase the current infusion rate.

The clinical picture is one of inadequate resuscitation as evidenced by:

UOP = 15 mL/hr (target is 35-70 mL/hr for a 70 kg adult)
Tachycardia (HR 104) despite acceptable BP
The patient has received only 3.5 L when ~4.9 L should have been given in the first 8 hours, and is now 5 hours post-injury

The infusion rate should be increased so that the full first-half Parkland volume is delivered by the 8-hour mark, and then rate adjustments continue based on UOP response thereafter.

Morgan & Mikhail's Clinical Anesthesiology, 7e, p. 1557
Sabiston Textbook of Surgery, 21e: Crystalloid-only resuscitation in first 24 hours; colloid added only after 24 hours

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