Abstract
Of 40 normal volunteers tilted on two separate occasions, seven subjects had vasovagal syncope only during one upright tilt, but showed increased endothelin plasma levels in the supine position and during head-up tilt on both occasions, independent of vasovagal syncope, compared to control subjects.
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Magerkurth, C., Riedel, A. & Braune, S. Permanent increase in endothelin serum levels in vasovagal syncope. Clin Auton Res 15, 299–301 (2005). https://doi.org/10.1007/s10286-005-0291-6
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DOI: https://doi.org/10.1007/s10286-005-0291-6