AI Article Synopsis
- The study investigates physiological changes in patients with neural-origin syncopes (SNO) linked to psychovegetative syndrome, focusing on heart rate variability and its relation to autonomic nervous system activity.
- An analysis of 68 patients revealed a consistent increase in very low frequency (VLF) heart rate components and a decrease in low frequency (LF) during a 20-minute orthostatic test, particularly in those who fainted.
- The findings suggest that elevated VLF correlates with high anxiety levels, indicating persistent cerebral sympathetic activation and impaired vasomotor regulation in SNO patients.
Article Abstract
Physiological changes accompanying syncopes of neural origin (SNO) in patients with psychovegetative syndrome are still insufficiently studied. The data concerning the role of the autonomic nervous system are discrepant. Heart rate variability was analyzed in 68 patients with SNO in a supine position and during the active 20-min orthostatic test taking into account the heart rate components of very low frequency (VLF, an index of cerebral sympathetic activity) and high frequency (HF, a marker of vagal modulation). Steady growth of the VLF and progressive decrease in the LF within 15-20 min of the orthostasis were observed in all the patients (n = 33), who fainted after this period. The predominance of the VLF in the heart rate power spectra was correlated with a high level of anxiety. It is suggested that this fact indicates the stable cerebral sympathetic activation resulting in a baroreceptor dysfunction, i.e., a failure of vasomotor regulation in patients with SNO.
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