Head-up tilt test
From WikiLectures
Head-up tilt test (HUT-test):
- 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:
→ 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).
- if syncope does not occur → provocation tests: β-sympathomimetics, nitrates,
- division of neurocardiogenic syncope in HUT-test:,
- vasodepressoric – ↓ BP without significant ↓ HR,
- cardioinhibitory – ↓ HR is significant , BP is not affected,
- mixed – ↓ BP and HR.
References[edit | edit source]
- DÍTĚ, P., et al. Vnitřní lékařství. 2. edition. Praha : Galén, 2007. ISBN 978-80-7262-496-6.
