Your brainstem may be failing to signal your breath before a seizure

Health · Published 18 October 2026 Swipe more like this →

In short: The respiratory center in your brainstem is the autopilot for your breathing. However, research suggests that for people with epilepsy, this autopilot might be malfunctioning even between seizures. This hidden dysfunction could be a key piece in understanding sudden, unexpected deaths.

The respiratory center, located in the medulla oblongata and pons of the brainstem, manages the rhythm and depth of breathing by integrating signals from chemoreceptors, mechanoreceptors, and the cerebral cortex. It is composed of three primary neuronal groups: the dorsal respiratory group (DRG), the ventral respiratory group (VRG), and the pontine respiratory group. The DRG is considered the most fundamental, initiating inspiration and setting the basic rate of respiration, while the VRG maintains the rhythm by stimulating muscles like the diaphragm.

Recent fMRI research into persons with epilepsy (PWE) has revealed a concerning underlying mechanism. During voluntary breath-holding tasks, PWE showed significantly lower brainstem activation compared to healthy controls. Specifically, the study identified decreased activation in the cuneiform nucleus during expiratory breath-holding and the median raphe nucleus during inspiratory breath-holding. These findings suggest that the brainstem regions responsible for respiratory control may suffer from interictal dysfunction—meaning they are impaired even when a seizure is not actively occurring.

This discovery is significant because it provides a potential clinical biomarker for Sudden Unexpected Death in Epilepsy (SUDEP). While the exact link is still being investigated, the reduced brainstem-cortical connectivity and lower activation levels in PWE suggest a vulnerability in the body's ability to manage respiration under stress. By using a simple breath-holding fMRI paradigm, clinicians may eventually be able to identify these neurological abnormalities in individuals at higher risk for life-threatening respiratory failure.

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