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Associations between Antiepileptic Use and Hypogammaglobulinaemia: Findings from a Population-Based Case-Control
Sarah L Perrott1, Angus D Macleod1
1Division of Applied Health Sciences, University of Aberdeen, Aberdeen, UK.
Neuroepidemiology
|September 21, 2023
Summary
Antiepileptic drugs (AEDs) are linked to a higher risk of hypogammaglobulinaemia, a condition that may increase infection susceptibility. Specific AEDs and cumulative exposure show a dose-response relationship, suggesting a potential causal link.
Area of Science:
- Immunology
- Pharmacology
- Epilepsy Research
Background:
- Increased mortality from infections (excluding pneumonia) in epilepsy patients is documented.
- Hypogammaglobulinaemia, a potential precursor to infections, has been observed in small cohorts on antiepileptic drugs (AEDs).
Purpose of the Study:
- To investigate the association between AED use and hypogammaglobulinaemia.
- To identify specific AEDs linked to hypogammaglobulinaemia.
- To explore potential causal relationships and exposure-response effects.
Main Methods:
- An unmatched case-control study utilizing linked routine health data (biochemistry, prescribing, morbidity) in North-East Scotland (2009-2021).
- Cases defined by immunoglobulin levels below the reference range; controls had normal/high levels.
- Logistic regression analysis adjusted for age, sex, and comorbidity; analysis of specific immunoglobulin types (IgA, IgM, IgG) and cumulative exposure.
Main Results:
- AED use was associated with an increased risk of hypogammaglobulinaemia (aOR 1.20).
- Phenytoin, carbamazepine, and lamotrigine showed strong associations with low IgA.
- Evidence of an exposure-response relationship between AED use and hypogammaglobulinaemia, including low IgA and IgG.
Conclusions:
- AEDs may elevate the risk of hypogammaglobulinaemia, with differential effects on immunoglobulin classes.
- The observed exposure-response relationship suggests a potential causal link between AEDs and hypogammaglobulinaemia.
- Clinical monitoring of immunoglobulin levels is recommended for patients on AEDs experiencing recurrent infections.
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