In:
Clinical Journal of the American Society of Nephrology, Ovid Technologies (Wolters Kluwer Health), Vol. 6, No. 3 ( 2011-03), p. 648-655
Abstract:
Hemoglobin (Hb) is an important nitric oxide (NO) buffer and a modulator of NO bioavailability. In addition, endothelial dysfunction is common in hypertensive patients, suggesting a pivotal role of hemoglobin concentration ([Hb]) in vascular function. To investigate the potential role of [Hb] in endothelium-dependent vasodilation, the relationship between Hb and endothelial function was tested in a group of patients with essential hypertension. Design, setting, participants, & measurements In this retrospective study, 174 nonsmoking, uncomplicated, never-treated hypertensives were enrolled. Endothelium-dependent and -independent vasodilation was assessed by measurement of forearm blood flow response during intra-arterial infusion of increasing doses of acetylcholine (ACh) and sodium nitroprusside (SNP) using strain-gauge plethysmography. Correlation with established risk factors of endothelial dysfunction was performed. Results The vasodilatory response to ACh was inversely ( P 〈 0.001) related to [Hb], and this relationship was do se dependent ( P 〈 0.001), being minimal at the lowest dose and maximal at the highest dose. No association was found between Hb and the vasodilatory response to SNP. In a multiple linear regression model adjusted for Framingham risk factors (age, sex, BP, cholesterol, body mass index, glucose) and emerging risk factors (homeostasis model assessment index, C-reactive protein, estimated GFR), [Hb] maintained a strong and independent link with the vasodilatory response to ACh ( P 〈 0.001). Conclusions In a large group of nonsmoking untreated hypertensives, [Hb] is inversely related to forearm endothelium-dependent vasodilation. [Hb] should be taken into account, especially in conditions associated with low [Hb], when performing vascular function studies.
Type of Medium:
Online Resource
ISSN:
1555-9041
DOI:
10.2215/CJN.06920810
Language:
English
Publisher:
Ovid Technologies (Wolters Kluwer Health)
Publication Date:
2011
detail.hit.zdb_id:
2216582-4
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