Advanced Trauma Life Support ATLS Student Course Manual 2018

PRIMARY SURVEY AND RESUSCITATION OF PATIENTS WITH BURNS 173
resuscitation is required to replace the ongoing losses
from capillary leak due to inflammation. Therefore,
clinicians should provide burn resuscitation fluids for
deep partial and full-thickness burns larger than 20%
TBSA, taking care not to over-resuscitate (n FIGURE 9-2).
After establishing airway patency and identifying
and treating life-threatening injuries, immediately
establish intravenous access with two large-caliber
(at least 18-gauge) intravenous lines in a peripheral
vein. If the extent of the burn precludes placing the
catheter through unburned skin, place the IV through
the burned skin into an accessible vein. The upper
extremities are preferable to the lower extremities as
a site for venous access because of the increased risk
of phlebitis and septic phlebitis when the saphenous
veins are used for venous access. If peripheral IVs
cannot be obtained, consider central venous access
or intraosseous infusion.
Begin infusion with a warmed isotonic crystalloid
solution, preferably lactated Ringer’s solution. Be
aware that resulting edema can dislodge peripheral
intravenous lines. Consider placing longer catheters
in larger burns.
Blood pressure measurements can be difficult to
obtain and may be unreliable in patients with severe
burn injuries. Insert an indwelling urinary catheter
in all patients receiving burn resuscitation fluids, and
monitor urine output to assess perfusion. Osmotic
diuresis (e.g., glycosuria or use of mannitol) can
interfere with the accuracy of urine output as a marker
of perfusion by overestimating perfusion.
The initial fluid rate used for burn resuscitation
has been updated by the American Burn Association
to reflect concerns about over-resuscitation when
n FIGURE 9-2 Patients with burns require resuscitation with
Ringer's lactate solution starting at 2 mL per kilogram of body
weight per percentage BSA of partial-thickness and full-thickness
burns during the first 24 hours to maintain adequate perfusion,
titrated hourly.
Pitfall
Intravenous catheters
and endotracheal
tubes can become
dislodged after
resuscitation.
prevention
• Remember that edema takes
time to develop.
• Use long IV catheters to
account for the inevitable
swelling that will occur.
• Do not cut endotracheal
tubes, and regularly assess
their positioning.
using the traditional Parkland formula. The current
consensus guidelines state that fluid resuscitation
should begin at 2 ml of lactated Ringer’s x patient’s body
weight in kg x % TBSA for second- and third-degree burns.
The calculated fluid volume is initiated in the
following manner: one-half of the total fluid is provided
in the first 8 hours after the burn injury (for example,
a 100-kg man with 80% TBSA burns requires 2 × 80 ×
100 = 16,000 mL in 24 hours). One-half of that volume
(8,000 mL) should be provided in the first 8 hours, so
the patient should be started at a rate of 1000 mL/hr.
The remaining one-half of the total fluid is administered
during the subsequent 16 hours.
It is important to understand that formulas provide a
starting target rate; subsequently, the amount of fluids
provided should be adjusted based on a urine output
target of 0.5 mL/kg/hr for adults and 1 mL/kg/hr for
children weighing less than 30 kg. In adults, urine
output should be maintained between 30 and 50 cc/
hr to minimize potential over-resuscitation.
The actual fluid rate that a patient requires depends
on the severity of injury, because larger and deeper
burns require proportionately more fluid. Inhalation
injury also increases the amount of burn resuscitation
required. If the initial resuscitation rate fails to produce
the target urine output, increase the fluid rate until the
urine output goal is met. However, do not precipitously
decrease the IV rate by one-half at 8 hours; rather, base
the reduction in IV fluid rate on urine output and titrate
to the lower urine output rate. Fluid boluses should be
avoided unless the patient is hypotensive. Low urine
output is best treated with titration of the fluid rate.
Resuscitation of pediatric burn patients (n FIGURE 9-3)
should begin at 3 mL/kg/% TBSA; this balances a higher
resuscitation volume requirement due to larger surface
area per unit body mass with the smaller pediatric
intravascular volume, increasing risk for volume
overload. Very small children (i.e., < 30 kg), should
receive maintenance fluids of D5LR (5% dextrose in
Lactated Ringers), in addition to the burn resuscitation
fluid. n TABLE 9-1 outlines the adjusted fluid rates and
target urine output by burn type.
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