Mortality after temporal lobe epilepsy surgery

Area of Science:

• Neurosurgery
• Epileptology
• Public Health

Background:

• Drug-resistant epilepsy poses significant mortality risks.
• Temporal lobe surgery is a treatment option for refractory epilepsy.
• Previous audits indicated elevated mortality post-temporal lobe surgery.

Purpose of the Study:

• To assess long-term mortality in patients who underwent temporal lobe surgery for drug-resistant epilepsy.
• To update mortality data beyond the previous audit period (ending 1997).

Main Methods:

• A cohort of 306 patients with temporal lobe epilepsy (TLE) who had temporal lobe resections between 1975-1995 was analyzed.
• Mortality data from December 1, 1997, to December 1, 2009, were collected and causes of death ascertained.
• Sudden unexpected death in epilepsy (SUDEP) cases were specifically identified and analyzed.

Main Results:

• 19 deaths occurred over 3,569 person-years, yielding a standardized mortality ratio (SMR) of 2.00.
• Elevated SMRs were observed in patients with mesial temporal sclerosis (MTS), men, and those with right-sided resections in MTS.
• Six SUDEP cases were recorded, with a rate of 1/595 person-years.

Conclusions:

• Premature death risk in TLE surgery patients decreased but remained higher than the general population.
• Specific subgroups, including men and those with MTS, showed persistently higher mortality risks.
• While reduced, the risk of SUDEP persists, highlighting the need for continued monitoring and research.