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Difficulty: HardPhysiological Adaptation

A 45-year-old client is admitted to the burn unit after sustaining full-thickness thermal burns to 40% of their total body surface area. Eight hours into the emergent resuscitation phase, the nurse assesses the following: blood pressure 84/52 mm Hg, heart rate 136 beats/minute, and a cumulative urine output of 25 mL over the past two hours. Arterial blood gas results indicate a pH of 7.28, PaCO2 of 29 mm Hg, and HCO3- of 15 mEq/L. Based on these clinical indicators, what is the most accurate interpretation of the client's condition and the priority nursing intervention?

  1. The client is experiencing severe hypovolemia and requires an immediate increase in the rate of the isotonic intravenous fluid infusion.Answer
  2. B
    The client has developed respiratory acidosis secondary to an airway injury and requires preparation for emergent endotracheal intubation.
  3. C
    The client is exhibiting early signs of distributive septic shock and requires the rapid administration of broad-spectrum intravenous antibiotics.
  4. D
    The client is demonstrating compensatory mechanisms but requires the initiation of a continuous vasopressor infusion to maintain renal perfusion.

Answer

The correct interpretation is that the client is experiencing severe hypovolemia and requires an immediate increase in the rate of the isotonic intravenous fluid infusion.
The correct answer recognizes that during the emergent phase of a major burn (first 24-48 hours), massive capillary leak leads to a profound intravascular fluid volume deficit. The client's hypotension, tachycardia, oliguria, and metabolic acidosis (demonstrated by the low HCO3- and compensatory low PaCO2) are classic indicators of hypovolemic burn shock causing tissue hypoperfusion and lactic acidosis. The absolute priority is to immediately increase the rate of isotonic intravenous fluids to restore circulating volume and ensure adequate organ perfusion.

Step-by-Step Solution

1
Analyze the time elapsed since the thermal injury.
The client is 8 hours post-injury, which places them squarely in the emergent (resuscitative) phase of burn care, characterized by massive fluid shifts from the intravascular space to the interstitial space.
Identifying the chronological phase of a major burn dictates the expected pathophysiological changes and anticipated complications.
2
Evaluate the hemodynamic parameters and end-organ perfusion metrics.
Profound hypotension (84/52 mm Hg), marked tachycardia (136 beats/minute), and severe oliguria (<30 mL/hr) indicate a critically low intravascular volume.
These findings are classic clinical manifestations of hypovolemic burn shock requiring aggressive volume replacement.
3
Interpret the arterial blood gas (ABG) values.
A pH of 7.28 and HCO3- of 15 mEq/L indicate primary metabolic acidosis, likely resulting from tissue hypoxia and lactic acid accumulation. The PaCO2 of 29 mm Hg reflects a compensatory respiratory alkalosis (hyperventilation).
Accurate ABG interpretation confirms metabolic failure due to hypoperfusion and rules out primary respiratory failure.
4
Determine the priority clinical intervention based on the synthesized data.
The immediate physiological priority is to titrate the isotonic crystalloid (e.g., lactated Ringer's) infusion upward to restore circulating intravascular volume and reverse tissue ischemia.
Fluid resuscitation is the definitive treatment for hypovolemic burn shock; secondary pharmacological interventions are contraindicated until volume is adequately restored.

Key Concept

Burn shock pathophysiology and hemodynamic resuscitation
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Topics

Physiological Adaptation

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