Absorption of oral vancomycin - possible associated toxicity

Area of Science:

• Pharmacology
• Nephrology
• Infectious Diseases

Background:

• Clostridium difficile pseudomembranous colitis is a serious intestinal infection.
• Vancomycin is a key antibiotic for treating C. difficile infections.
• Oral vancomycin is typically used for gastrointestinal infections with minimal systemic absorption.

Observation:

• A case of an anephric (lacking kidneys) child receiving oral vancomycin for C. difficile colitis is presented.
• The child exhibited significant vancomycin accumulation, with serum levels reaching 34 µg/ml and CSF levels of 4.2 µg/ml.
• An unexplained clinical syndrome of fever and encephalopathy coincided with these elevated drug concentrations.

Findings:

• Oral vancomycin administration led to substantial systemic absorption and accumulation in an anephric pediatric patient.
• Elevated vancomycin levels were directly correlated with the onset of fever and encephalopathy.
• Hemodialysis effectively reduced serum vancomycin concentrations from 34 µg/ml to 24 µg/ml, leading to rapid symptom resolution.

Implications:

• Patients with renal impairment, particularly those who are anephric, are at high risk for vancomycin accumulation even with oral administration.
• Intestinal disease may further compromise the ability to excrete vancomycin, increasing toxicity risk.
• Careful monitoring of vancomycin levels and clinical status is crucial in patients with compromised renal function and C. difficile infection.