Abstract
To the Editor: In their study, “Dysfunctional Baroreflex Regulation of Sympathetic Nerve Activity in Patients With Vasovagal Syncope,” Bechir et al1 implied a unilateral causal relationship between reduction of arterial baroreflex control of heart rate and increase of muscle sympathetic nerve activity (MSNA) in patients with syncope. The authors concluded that dysfunctional baroreflex regulation of sympathetic activity provides “new insights into the mechanisms of vasovagal syncope…” We have two comments. Baroreflex function can be depressed by suprabulbar central influences and also by vagal, somatic, or sympathetic2 afferents. …
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