Head-up tilt test

Head-up tilt test (HUT-test): → aktivation of sympaticus → tachycardia + hypercontractility myocardium → irritation of mechanoreceptors in the myocardium + large arteries → a reflex response is mediated by the centers in medulla oblongata: ↑ tone of parasympathetic, ↓ HR, ↓ BP, ↓ CNS perfusion → syncope (ie. excessive sympathetic + parasympathetic reactions to orthostatic load).
 * consists in tilting the patient on an adjustable bed at an angle of 60 ° for 40 minutes (by Peňáz's method are from finger monitored BP + HR).
 * Used to confirm the diagnosis + effectiveness of vasovagal therapy (neurocardiogenic) of syncope (a brief loss of consciousness following a previous upright position typical for young asthenics) – insufficient return of venous blood to the heart:
 * if syncope does not occur → provocation tests: &beta;-sympathomimetics, nitrates,
 * division of neurocardiogenic syncope in HUT-test: ,
 * 1) vasodepressoric – ↓ BP without significant ↓ HR,
 * 2) cardioinhibitory – ↓ HR is significant, BP is not affected,
 * 3) mixed – ↓ BP and HR.