Why the study?
Patients with amyotrophic lateral sclerosis occasionally exhibit autonomic nervous system dysregulation, prompting investigation into whether autonomic regulation differs across patients with varying severity and progression.
Does heart rate variability differ across patients with ALS with varying severity and progression compared to healthy controls?
Does heart rate variability differ across patients with ALS with varying severity and progression compared to healthy controls?
Autonomic dysregulation in ALS, characterized by parasympathetic hypoactivity and sympathetic predominance, may be present in early stages and differs depending on disease severity and progression.
Suggests autonomic heterogeneity in ALS; leaves open whether HRV clusters predict outcomes or guide care.
BACKGROUND: Patients with amyotrophic lateral sclerosis (ALS) occasionally exhibit autonomic nervous system dysregulation. We examined whether autonomic regulation differed across patients with ALS with varying severity and progression. METHODS: A total of 45 patients with ALS were enrolled and classified into three subgroups using cluster analysis. Heart rate variability was assessed using the maximum entropy method. The low-frequency (LF) and high-frequency (HF) components, LF/HF ratio (LF/HF), and heart rate (HR) were measured. Temporal changes in each parameter during rest, mental tasks, and post-task rest were evaluated. The values for all patients and subgroups were compared with those of 11 healthy control subjects. Between-group differences were evaluated at rest and using the Task/Rest and After/Task ratios, and within-group changes across the three phases were also analyzed, with non-parametric statistical tests applied. RESULTS: Cluster analysis classified the patients into three groups: "Group 1: early-preserved group", "Group 2: late-preserved group", and "Group 3: late-impaired group". Overall, the patients showed lower HF and higher LF/HF at rest than the controls, indicating parasympathetic hypoactivity and sympathetic predominance. Abnormalities were more prominent in Groups 1 and 3 than in Group 2. The former two groups showed blunted HF, LF/HF and HR responses during the tasks. The late-preserved group (Group 2) showed no difference in the Task/Rest ratios of HF, LF/HF and HR compared with the controls. CONCLUSION: Autonomic regulatory functions differ depending on the severity and progression of ALS. The presence of HRV abnormalities in early-preserved patients suggests that autonomic dysregulation in ALS may not be limited to a late-stage secondary complication but may also be present earlier stages. Recognizing HRV abnormalities from early stages may help identify patients at risk of faster progression. Future longitudinal studies in larger cohorts are needed to establish the pathophysiological significance of HRV abnormalities.
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Sawada et al. (2026) studied this question.
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