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  • Title: Vasovagal syncope with bradycardia during lower body negative pressure in a heart transplant recipient.
    Author: Giannattasio C, Grassi G, Mancia G.
    Journal: Blood Press; 1993 Dec; 2(4):309-11. PubMed ID: 8173701.
    Abstract:
    Vasovagal syncope has been ascribed to the vagal excitation and the sympathetic inhibition induced reflexly by mechanical stimulation of receptors in the ventricles. In this case report we describe a vasovagal syncope with bradycardia triggered by a reduction in venous return obtained via mild lower body negative pressure, in a patient with cardiac denervation due to heart transplantation. This suggests that the mechanisms involved in this phenomenon may not exclusively depend on a reflex originating from ventricular receptors. It also suggests that non-neural factors may be involved in the genesis of the bradycardia.
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