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Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance

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[Origin and evolution of vasovagal syncope].

Paolo Alboni¹, Marco Alboni, Giorgio Bertorelle

¹Divisione di Cardiologia, Ospedale Civile, Cento, FE. p.alboni@ausl.fe.it

Giornale Italiano Di Cardiologia (2006)

|April 13, 2010

Summary

Vasovagal syncope (VVS) is not a disease but an individual trait. This reflex, involving sudden drops in blood pressure and heart rate, appears to be an ancient defense mechanism rooted in vertebrate evolution.

Area of Science:

Physiology
Evolutionary Biology
Cardiovascular Science

Context:

Vasovagal syncope (VVS) presents as sudden hypotension and bradycardia, stemming from autonomic nervous system imbalance.
Evidence suggests VVS is an individual characteristic rather than a disease, prompting investigation into its evolutionary origins.

Purpose:

To explore the evolutionary basis and physiological mechanisms of the vasovagal reflex across vertebrates.
To understand the potential adaptive functions of VVS in different species and conditions.

Summary:

The vasovagal reflex, observed in humans and animals, shares mechanisms related to fear/threat bradycardia and responses to hemorrhagic shock.
Thoracic hypovolemia triggers the vasovagal reflex in humans during orthostatic stress, mirroring responses in other mammals.

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Similarities in sympathetic and vagal system activation suggest a common evolutionary origin for the vasovagal reflex in vertebrates.

Impact:

The vasovagal reflex may represent a conserved defense mechanism protecting the heart during stressful cardiovascular events.
Slowing heart rate during VVS could reduce myocardial oxygen demand and enhance diastolic filling and coronary perfusion.
Understanding the evolutionary roots of VVS provides insights into its physiological role and potential therapeutic targets.