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Toxicology – Non-Anion Gap Metabolic Acidosis (HARD UP)
Hyperalimentation (TPN)
Total parenteral nutrition with excessive chloride content can result in hyperchloremic metabolic acidosis. Management involves reducing chloride and increasing acetate in the formulation. Regular monitoring with daily basic metabolic panels is important in these patients.
Acetazolamide
Acetazolamide inhibits carbonic anhydrase in the proximal tubule, leading to increased urinary bicarbonate loss and a non-anion gap metabolic acidosis. Patients may experience paresthesias in the extremities and a metallic taste.
Renal Tubular Acidosis (RTA)
Renal tubular dysfunction impairs acid and ammonia excretion, resulting in hyperchloremic metabolic acidosis. It is classified into Type I (distal, hypokalemic), Type II (proximal, hypokalemic), and Type IV (hyperkalemic). Type III is no longer recognized as a separate entity.
Diarrhea
Loss of bicarbonate through the gastrointestinal tract leads to non-anion gap metabolic acidosis. Treatment includes intravenous fluids and bicarbonate replacement.
Ureteroenteric Fistula
This condition can cause metabolic acidosis through several mechanisms: reabsorption of ammonium chloride from urine, exchange of chloride for bicarbonate in the bowel, and renal tubular impairment. Risk increases with prolonged urine exposure to bowel mucosa and greater surface area involvement.
Pancreaticoduodenal Fistula
Similar to diarrhea, this condition leads to bicarbonate loss and subsequent non-anion gap metabolic acidosis. Management focuses on fluid resuscitation and correction of electrolyte imbalances.
Hyperalimentation (TPN)
Total parenteral nutrition with excessive chloride content can result in hyperchloremic metabolic acidosis. Management involves reducing chloride and increasing acetate in the formulation. Regular monitoring with daily basic metabolic panels is important in these patients.
Acetazolamide
Acetazolamide inhibits carbonic anhydrase in the proximal tubule, leading to increased urinary bicarbonate loss and a non-anion gap metabolic acidosis. Patients may experience paresthesias in the extremities and a metallic taste.
Renal Tubular Acidosis (RTA)
Renal tubular dysfunction impairs acid and ammonia excretion, resulting in hyperchloremic metabolic acidosis. It is classified into Type I (distal, hypokalemic), Type II (proximal, hypokalemic), and Type IV (hyperkalemic). Type III is no longer recognized as a separate entity.
Diarrhea
Loss of bicarbonate through the gastrointestinal tract leads to non-anion gap metabolic acidosis. Treatment includes intravenous fluids and bicarbonate replacement.
Ureteroenteric Fistula
This condition can cause metabolic acidosis through several mechanisms: reabsorption of ammonium chloride from urine, exchange of chloride for bicarbonate in the bowel, and renal tubular impairment. Risk increases with prolonged urine exposure to bowel mucosa and greater surface area involvement.
Pancreaticoduodenal Fistula
Similar to diarrhea, this condition leads to bicarbonate loss and subsequent non-anion gap metabolic acidosis. Management focuses on fluid resuscitation and correction of electrolyte imbalances.
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