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- Title
- Nebivolol increases arterial distensibility in vivo
- Related
- Hypertension, Vol. 44, Issue 3 (2004), p.305-310
- DOI
- 10.1161/01.HYP.0000137983.45556.6e
- Publisher
- American Heart Association
- Date
- 2004
- Author/Creator
- McEniery, Carmel M
- Author/Creator
- Schmitt, Matthias
- Author/Creator
- Qasem, Ahmad
- Author/Creator
- Webb, David J
- Author/Creator
- Avolio, Alberto P
- Author/Creator
- Wilkinson, Ian B
- Author/Creator
- Cockcroft, John R
- Description
- Arterial stiffness is a key determinant of cardiovascular risk in hypertensive patients. [beta]-Blockers appear to be less effective than other drugs in improving outcome in hypertensive patients, and a potential explanation may be that [beta]-blockers are less effective in reducing arterial stiffness. The aim of this study was to assess the direct effect of [beta]-blockade on pulse wave velocity (PWV), a robust measure of arterial distensibility, using a local, ovine, hind-limb model. In addition, we hypothesized that the vasodilating [beta]-blocker nebivolol, but not atenolol, would increase arterial distensibility in vivo. All studies were conducted in anesthetized sheep. PWV was recorded in vivo using a dual pressure-sensing catheter placed in the common iliac artery. Intraarterial infusion of nebivolol reduced PWV by 6±3% at the higher dose (P<0.001), but did not alter mean arterial pressure (change of -1±3 mm Hg, P=0.1). In contrast, atenolol had no effect on PWV (P=0.11) despite a small drop in mean pressure (change of -5±3 mm Hg, P<0.01). Infusion of glyceryl trinitrate led to a dose-dependent fall in PWV, and 2 nmol/min produced a similar reduction in PWV to the higher dose of nebivolol (500 nmol/min). The effect of nebivolol on PWV was significantly attenuated during coinfusion of NG-monomethyl-l-arginine (P=0.003) and also during coinfusion of butoxamine (P=0.02). These results demonstrate that nebivolol, but not atenolol, increases arterial distensibility. This effect of nebivolol is mediated through the release of NO via a [beta]2 adrenoceptor–dependent mechanism. Thus, nebivolol may be of benefit in conditions of increased large artery stiffness, such as isolated systolic hypertension.
- Description
- 6 page(s)
- Subject Keyword
- 110300 Clinical Sciences
- Subject Keyword
- blood pressure
- Subject Keyword
- nitric oxide
- Subject Keyword
- arteries
- Subject Keyword
- hemodynamics
- Subject Keyword
- receptors
- Subject Keyword
- adrenergic [beta]
- Resource Type
- journal article
- Organisation
- Macquarie University. Australian School of Advanced Medicine
- Identifier
- http://hdl.handle.net/1959.14/116530
- Identifier
- ISSN:0194-911X
- Identifier
- mq-rm-2008002987
- Language
- eng
- Reviewed
Macquarie University ResearchOnline
