Acute hyperhomocysteinaemia affects pulse pressure but not microvascular vasodilator function.
Br J Clin Pharmacol
; 52(3): 327-32, 2001 Sep.
Article
en En
| MEDLINE
| ID: mdl-11560567
ABSTRACT
AIMS:
Raised homocysteine (hcy) levels are associated with premature coronary artery disease, but the underlying vascular mechanism and the extent to which hcy affects small vessel vasodilator responses (especially non-nitric oxide mediated pathways) are unclear.METHODS:
This double-blind, placebo-controlled crossover study in 14 healthy male subjects evaluated the effects of single-dose oral methionine 15 g (to induce acute hyperhomocysteinaemia) on cutaneous microvascular vasodilator responses to incremental-dose iontophoretic administration of acetylcholine (Ach) and sodium nitroprusside (SNP) using laser Doppler fluximetry (LDF), and the effects on von Willibrand factor (vWF) levels and systemic haemodynamics.RESULTS:
Methionine administration produced a three fold rise in plasma hcy levels at 8 h, which was accompanied by a significant increase in pulse pressure (53 vs 49 mmHg, P < 0.05) but no change in heart rate. Acute hyperhomocysteinaemia had no significant effect on incremental microvascular vasodilator dose-response curves to Ach and SNP, or circulating levels of vWF.CONCLUSIONS:
The present study shows that acute hyperhomocysteinaemia increases pulse pressure (a marker of large vessel stiffness) but has no effect on endothelial-dependent (non-NO-mediated) microvascular vasodilation.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Pulso Arterial
/
Vasodilatación
/
Vasos Sanguíneos
/
Homocisteína
Tipo de estudio:
Clinical_trials
Límite:
Adult
/
Humans
/
Male
Idioma:
En
Revista:
Br J Clin Pharmacol
Año:
2001
Tipo del documento:
Article
País de afiliación:
Reino Unido