Pathophysiology of SUDEP: How far are we from understanding?

Area of Science:

• Neurology
• Epileptology
• Respiratory Medicine

Background:

• Sudden and unexpected death in epilepsy patients (SUDEP) is the leading cause of mortality in individuals with drug-resistant epilepsy.
• Research is ongoing to understand the mechanisms and risk factors contributing to SUDEP.
• This review focuses on current pathophysiological hypotheses for SUDEP in clinical and pre-clinical models.

Purpose of the Study:

• To review and discuss the main pathophysiological hypotheses of SUDEP.
• To explore the role of seizures and respiratory dysfunction in SUDEP.
• To highlight the potential contribution of serotonin dysfunction to SUDEP risk.

Main Methods:

• Review of existing clinical and pre-clinical studies on SUDEP.
• Analysis of data on seizure-triggered events and respiratory control.
• Examination of the role of neurochemicals, such as serotonin, in SUDEP pathophysiology.

Main Results:

• SUDEP is typically triggered by seizures, with central fatal apnea identified as the primary cause of death.
• Chronic respiratory regulation impairments may elevate SUDEP risk.
• Serotonin dysfunction is implicated in the respiratory abnormalities associated with SUDEP.

Conclusions:

• Understanding SUDEP pathophysiology is crucial for improved risk assessment in epilepsy patients.
• Further research is needed to elucidate the precise mechanisms linking SUDEP and peri-ictal respiratory dysfunction.
• Targeting respiratory regulation and serotonin pathways may offer future therapeutic strategies for SUDEP prevention.