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Researchers tested whether playing carefully timed sounds during sleep could reduce epileptic brain activity in children with epilepsy. They found that delivering repetitive auditory tones synchronized to the down-phase of slow brain waves during non-REM sleep significantly reduced the frequency of interictal epileptiform discharges (spikes) that are associated with cognitive impairment in childhood epilepsies. The study involved two phases: an exploratory study with 10 children testing different sound patterns, followed by a proof-of-concept study with 5 children using the optimized approach throughout entire nights.
Why it matters
This non-invasive intervention could offer a new treatment avenue for reducing epileptic spikes during sleep in children, potentially helping to prevent the cognitive impairments associated with high spike burden during critical developmental periods. The mechanistically-guided approach demonstrates that modulating sleep oscillations can influence pathological brain activity without medication or invasive procedures.
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⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
Interictal epileptiform discharges, so called spikes, are often strongly activated during non-rapid eye movement (NREM) sleep in childhood epilepsies. In children with pronounced spike activation during NREM – sleep, spike burden can be associated with lifelong impaired cognitive functions. This spike activation is also related to alterations in sleep oscillations, specifically slow waves and spindles, which play essential roles in brain maintenance and maturation. These observations suggest that spikes may disrupt sleep-dependent brain processes that are critical for the development of cognitive functions. Phase-targeted auditory stimulation during NREM sleep delivers brief, non-arousing tones at specific phases of ongoing slow waves to modulate sleep oscillations. Recently, our group showed that isolated, less frequent, and thus less expected, tones engage widespread thalamocortical networks, whereas repetitive, regular trains of tones promote habituation and engage more local corticocortical networks. In this study, we use these contrasting stimulation patterns for a targeted modulation of sleep oscillations and examine their interaction with epileptic spikes. In an initial exploratory study (N = 10; age range: 7.3 – 16.2 years), we used a within-night block design to directly compare responses to the different stimulation patterns. Isolated tones delivered at long interstimulus intervals induced a transient increase in spike rate, whereas down-phase stimulation delivered in trains at short, regular intervals was associated with a significant reduction. We subsequently optimized the train-based paradigm and evaluated stimulation delivered throughout the night in a proof-of-concept study using a counterbalanced, between-night design (N = 5; age range: 4.4 – 10.7 years). Spike density decreased locally in all patients, providing convergent evidence for the effects observed in the exploratory study. With this mechanistically guided approach, we demonstrate that repetitive down-phase auditory stimulation of slow waves results in a local reduction of epileptic spikes. This framework may provide a rational basis for targeted interventions aimed at reducing spikes and related cognitive impairments.
Source: Optimized phase-targeted auditory stimulation reduces nocturnal spikes in childhood epilepsies