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Endothelin system polymorphisms in tilt test-induced vasovagal syncope.

Sandro Sorrentino1, Cinzia Forleo, Massimo Iacoviello

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Summary

Genetic variations in the endothelin system influence syncope susceptibility. The 4A variant of the EDN1 gene is linked to vasodepressive responses during tilt testing, increasing syncope risk.

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Area of Science:

  • Cardiovascular Physiology
  • Human Genetics
  • Clinical Medicine

Background:

  • The endothelin system plays a crucial role in maintaining cardiovascular homeostasis.
  • Vasovagal syncope is a common condition often triggered by autonomic dysfunction.
  • Genetic factors may contribute to an individual's susceptibility to syncope.

Purpose of the Study:

  • To investigate the association between endothelin system gene polymorphisms and the occurrence of tilt-induced vasovagal syncope.
  • To determine if specific endothelin gene variants influence hemodynamic responses during syncope provocation.

Main Methods:

  • A cohort of 107 patients with recurrent unexplained syncope underwent head-up tilt testing.
  • Genotyping was performed for the EDN1 gene 3A/4A polymorphism and the EDNRA gene H323H T/C polymorphism.
  • Statistical analyses, including univariate and multivariate analyses, were used to assess associations.

Main Results:

  • 54% of participants experienced syncope during the tilt test.
  • The 4A allele of the EDN1 gene was significantly more frequent in patients who fainted (tilt-positive).
  • Carriers of the 4A allele were more likely to exhibit a vasodepressive syncope pattern.

Conclusions:

  • The 3A/4A polymorphism in the EDN1 gene is associated with syncope susceptibility.
  • The 4A allele, potentially leading to increased endothelin-1 expression, may predispose individuals to vasodepressive responses during tilt testing.