Weather as a risk factor for epileptic seizures: A case-crossover study

Area of Science:

• Neurology
• Environmental Medicine
• Epidemiology

Background:

• Epileptic seizures often occur unpredictably.
• The influence of environmental factors, such as weather, on seizure occurrence is not fully understood.
• Patients frequently perceive weather as a trigger for epileptic seizures.

Purpose of the Study:

• To investigate the association between specific weather parameters and the risk of epileptic seizures.
• To evaluate the clinical significance of weather as a potential risk factor for epilepsy.

Main Methods:

• A hospital-based, bidirectional case-crossover study.
• Recruited 604 adult patients with unprovoked epileptic seizures between 2003 and 2010.
• Assessed the impact of atmospheric pressure, relative humidity, and temperature on seizure onset in a temperate climate.

Main Results:

• A decrease in atmospheric pressure correlated with increased seizure risk (14% increase per 10.7 hPa drop).
• High relative humidity (>80%) was associated with a 48% increase in seizure risk.
• High ambient temperatures (>20°C) were linked to a 46% decrease in seizure risk, particularly in males.

Conclusions:

• Low atmospheric pressure and high humidity are associated with elevated epileptic seizure risk.
• High ambient temperatures may reduce seizure risk.
• Weather-dependent seizure risk may be more significant in patients with less severe epilepsy, warranting further research across diverse climates.