Cerebrospinal dehydrogenases in central nervous system infections

Area of Science:

• Neurology
• Biochemistry
• Infectious Diseases

Background:

• Central nervous system (CNS) infections pose diagnostic challenges.
• Differentiating between various CNS infections like meningitis and encephalitis is crucial for effective treatment.
• Cerebrospinal fluid (CSF) biomarkers can aid in diagnosing CNS infections.

Purpose of the Study:

• To evaluate the diagnostic utility of CSF dehydrogenases, specifically lactate dehydrogenase (LDH) and isocitrate dehydrogenase (ICD), in differentiating between pyogenic meningitis, tuberculous meningitis, and encephalitis.
• To assess the correlation between CSF dehydrogenase activity and clinical status, CSF protein content, and cell count.

Main Methods:

• Analysis of CSF samples from 42 controls and 104 patients with CNS infections (23 pyogenic meningitis, 22 tuberculous meningitis, 19 encephalitis).
• Measurement of CSF-LDH and ICD activity.
• Statistical analysis to compare enzyme levels across different groups and correlate with clinical parameters.

Main Results:

• CSF-LDH and ICD activities were significantly elevated in all CNS infections compared to controls (p < 0.0001).
• LDH levels were significantly higher in pyogenic meningitis than in tuberculous meningitis or encephalitis (p < 0.001).
• ICD activity showed significant differences among the three infection types (p < 0.001).
• Dehydrogenase activity decreased with clinical improvement.
• Enzyme activity correlated directly with CSF protein and total cell count.

Conclusions:

• CSF-LDH and ICD assays are valuable tools for differentiating between pyogenic meningitis, tuberculous meningitis, and encephalitis.
• These enzyme assays improve diagnostic accuracy for CNS infections.
• Monitoring CSF dehydrogenase levels can reflect disease activity and response to treatment.