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[Therapeutic possibilities for the management of vasovagal syncopes]
1Service de Candiologie, Faculté de Médecine de Nice Sophia-Antipolis.
Abstract:
Since the advent of the tilt test, our understanding of the pathogenesis of vasovagal syncope has progressed greatly. Two mechanisms lead to the sudden fall in blood pressure: on one hand a series of interrelated neuroreflexes, and on the other, neuroendocrine effects. Although our understanding is not complete, new therapeutic measures can be proposed beyond simple empiric prescriptions of vagolytic agents. The efficacy of different treatments is yet to be proven due to the need for long controlled trials with large numbers of subjects. In the early studies versus placebo, no significant evidence of a preventive effect against recurrent malaise could be distinguished from the placebo effect. Complementary investigations such as the tilt test also act as a placebo. While firm recommendations for effective prevention cannot be established until the results of controlled trials are available, it is nevertheless possible to propose a reasonable approach to management.
Insights
Understanding vasovagal syncope pathogenesis has advanced, revealing neuroreflex and neuroendocrine mechanisms. While effective prevention strategies require more research, a practical management approach is possible.
Area of Science:
- Cardiology
- Neurology
- Physiology
Context:
- Vasovagal syncope pathogenesis understanding has advanced significantly with the introduction of the tilt test.
- Two primary mechanisms contribute to the sudden drop in blood pressure: neuroreflexes and neuroendocrine effects.
Purpose:
- To review the current understanding of vasovagal syncope pathogenesis.
- To discuss potential therapeutic measures beyond traditional vagolytic agents.
- To highlight the need for controlled trials to establish treatment efficacy.
Summary:
- The tilt test has greatly improved the understanding of vasovagal syncope, identifying neuroreflex and neuroendocrine pathways.
- Current knowledge is incomplete, but new therapeutic strategies can be proposed.
- The efficacy of treatments requires validation through large, controlled trials, as early studies showed no significant difference from placebo.
Impact:
- Advances in understanding may lead to more targeted and effective treatments for vasovagal syncope.
- Highlights the limitations of current evidence and the necessity for rigorous clinical trials.
- Suggests a pragmatic management approach is feasible despite the need for further research.