Muscle tissue electrolytes in burned subjects

Area of Science:

• Biochemistry
• Physiology
• Burn Medicine

Background:

• Burn injuries significantly disrupt cellular homeostasis.
• Understanding electrolyte and acid-base balance post-burn is critical for patient outcomes.
• Intracellular changes are key to severe burn pathophysiology.

Purpose of the Study:

• To investigate extracellular and intracellular electrolyte and nitrogen status in burn patients.
• To differentiate early and later phase changes after severe burn injury.
• To assess the impact of nutritional support on these post-burn alterations.

Main Methods:

• Measured extracellular electrolytes and acid-base status in burn patients.
• Analyzed intracellular electrolytes and nitrogen via muscle needle biopsy.
• Evaluated changes at 12-24 hours and 7-14 days post-burn.
• Assessed patients with burns covering at least 20% body surface area.

Main Results:

• Early phase (12-24 hours): Uncommon extracellular disturbances; increased muscle sodium, decreased muscle potassium and magnesium; normal muscle nitrogen.
• Later phase (7-14 days): Electrolyte changes persist despite adequate fluid and protein-calorie supply.
• No decrease in muscle cell nitrogen observed in either phase.
• Muscle potassium depletion suggests potential cell membrane sodium-potassium pump defects or reduced cell capacity for potassium.

Conclusions:

• Extracellular electrolyte and acid-base status are generally stable in the acute phase of severe burns.
• Intracellular electrolyte shifts, particularly muscle potassium depletion, are significant early and persist.
• Adequate nutritional support does not fully correct these intracellular deficits, indicating potential underlying cell membrane dysfunction or altered muscle protein metabolism.