Discover the groundbreaking connection between vagus nerve stimulation and heart rate variability, and how this somatic oscillatory signal is revolutionizing our understanding of pediatric neurosurgery.
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Vagus nerve stimulation and heart rate variability: A scoping review of a somatic oscillatory signal.
Wessel et al., Clin Neurophysiol 2024
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https://doi.org/10.1016/j.clinph.2024.02.011
This review focuses on the impact of vagus nerve stimulator (VNS) on heart rate variability (HRV) in patients with drug-resistant epilepsy (DRE) and its correlation with seizure relief. Through a scoping literature review, 29 studies were analyzed, revealing a persistent depression in HRV in DRE patients post-VNS implant, suggesting that normalization of HRV is not essential for the therapeutic efficacy of VNS. Interestingly, frequency domain parameters of HRV altered six months post-implant but reverted to baseline after one year. This indicates that the mechanism by which VNS reduces seizure frequency may not be directly linked to changes in HRV. The review highlights the need for more standardized experimental and analytical methods to understand the nuanced effects of VNS on autonomic signaling. This study contributes to the understanding of VNS’s therapeutic mechanisms in DRE, emphasizing the complexity of its effects on autonomic function.