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Decrease in serum procalcitonin levels over time during treatment of acute bacterial meningitis.

Alain Viallon1, Pantéa Guyomarc'h, Stéphane Guyomarc'h

  • 1Emergency and Intensive Care Units, Bellevue Hospital, Saint-Etienne, France. alain.viallon@chu-st-etienne.fr

Critical Care (London, England)
|September 3, 2005
PubMed
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Serum procalcitonin levels rapidly decrease with effective antibiotic treatment for bacterial meningitis. This rapid decline suggests lumbar puncture may be less valuable for assessing treatment efficacy 48-72 hours post-admission.

Area of Science:

  • Infectious Diseases
  • Clinical Microbiology
  • Biomarkers

Background:

  • Community-acquired acute bacterial meningitis is a serious infection requiring prompt diagnosis and treatment.
  • Serum procalcitonin is a biomarker used to guide antibiotic therapy in bacterial infections.

Purpose of the Study:

  • To characterize the dynamic changes in serum procalcitonin (PCT) levels during the treatment of community-acquired acute bacterial meningitis.
  • To evaluate the utility of PCT as a marker for treatment response in this patient population.

Main Methods:

  • A cohort of 48 patients with confirmed bacterial meningitis and elevated admission serum PCT levels (>0.5 ng/ml) were prospectively studied.
  • Serum PCT and C-reactive protein (CRP) levels were measured on admission and at day 2 of antibiotic treatment.

Related Experiment Videos

  • Causative bacterial pathogens were identified, and treatment efficacy was assessed clinically and by cerebrospinal fluid sterilization.

    • Main Results:

    • A significant decrease in median serum PCT levels was observed from 4.5 (interquartile range [IQR] 2.8-10.8) mg/ml on admission to 2 (IQR 0.9-5.0) mg/ml on day 2 (P < 0.0001).
    • In contrast, serum CRP levels showed a non-significant increase during the same period.
    • Cerebrospinal fluid sterilization was achieved in 34 patients by 48-72 hours, and all patients responded to initial antibiotic treatment.

    Conclusions:

    • Serum procalcitonin levels demonstrate a rapid decline in response to appropriate antibiotic therapy for bacterial meningitis.
    • The rapid decrease in PCT levels may reduce the diagnostic value of lumbar puncture performed 48-72 hours after treatment initiation for assessing efficacy.
    • PCT monitoring offers a potentially faster method for evaluating treatment response compared to traditional methods.