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Increase in fasting vascular endothelial function after short-term oral L-arginine is effective when baseline flow-mediated dilation is low: a meta-analysis of randomized controlled trials.
Am J Clin Nutr 2009; 89(1):77-84AJ

Abstract

BACKGROUND

Previous trials suggest that oral l-arginine administration affects endothelial function. However, most of these studies were small, the conclusions were inconsistent, and the precise effects are therefore debatable.

OBJECTIVE

The objective was to assess the effect of oral l-arginine supplementation on endothelial function, as measured with the use of fasting flow-mediated dilation (FMD).

DESIGN

We conducted a meta-analysis of randomized, placebo-controlled l-arginine supplementation trials that evaluated endothelial function. Trials were identified in PubMed, Cochrane Library, Embase, reviews, and reference lists of relevant papers. The weighted mean difference (WMD) was calculated for net changes in FMD by using random-effect models. Previously defined subgroup analyses and meta-regression analyses were performed to explore the influence of study characteristics.

RESULTS

Thirteen trials were included and evaluated. Because there was only one long-term study, we focused on short-term effects of l-arginine (12 studies, 492 participants). In an overall pooled estimate, l-arginine significantly increased FMD (WMD: 1.98%; 95% CI: 0.47, 3.48; P = 0.01). Meta-regression analysis indicated that the baseline FMD was inversely related to effect size (regression coefficient = -0.55; 95% CI: -1.00, -0.1; P = 0.016). A subgroup analysis suggested that l-arginine supplementation significantly increased FMD when the baseline FMD levels were <7% (WMD: 2.56%; 95% CI: 0.87, 4.25; P = 0.003), but had no effect on FMD when baseline FMD was >7% (WMD: -0.27%; 95% CI: -1.52, 0.97; P = 0.67).

CONCLUSION

Short-term oral l-arginine is effective at improving the fasting vascular endothelial function when the baseline FMD is low.

Authors+Show Affiliations

Key Laboratory for Clinical Cardiovascular Genetics & Sino-German Laboratory for Molecular Medicine, Cardiovascular Institute & FuWai Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Meta-Analysis
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19056561

Citation

Bai, Yongyi, et al. "Increase in Fasting Vascular Endothelial Function After Short-term Oral L-arginine Is Effective when Baseline Flow-mediated Dilation Is Low: a Meta-analysis of Randomized Controlled Trials." The American Journal of Clinical Nutrition, vol. 89, no. 1, 2009, pp. 77-84.
Bai Y, Sun L, Yang T, et al. Increase in fasting vascular endothelial function after short-term oral L-arginine is effective when baseline flow-mediated dilation is low: a meta-analysis of randomized controlled trials. Am J Clin Nutr. 2009;89(1):77-84.
Bai, Y., Sun, L., Yang, T., Sun, K., Chen, J., & Hui, R. (2009). Increase in fasting vascular endothelial function after short-term oral L-arginine is effective when baseline flow-mediated dilation is low: a meta-analysis of randomized controlled trials. The American Journal of Clinical Nutrition, 89(1), pp. 77-84. doi:10.3945/ajcn.2008.26544.
Bai Y, et al. Increase in Fasting Vascular Endothelial Function After Short-term Oral L-arginine Is Effective when Baseline Flow-mediated Dilation Is Low: a Meta-analysis of Randomized Controlled Trials. Am J Clin Nutr. 2009;89(1):77-84. PubMed PMID: 19056561.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Increase in fasting vascular endothelial function after short-term oral L-arginine is effective when baseline flow-mediated dilation is low: a meta-analysis of randomized controlled trials. AU - Bai,Yongyi, AU - Sun,Lan, AU - Yang,Tao, AU - Sun,Kai, AU - Chen,Jingzhou, AU - Hui,Rutai, Y1 - 2008/12/03/ PY - 2008/12/6/pubmed PY - 2009/2/6/medline PY - 2008/12/6/entrez SP - 77 EP - 84 JF - The American journal of clinical nutrition JO - Am. J. Clin. Nutr. VL - 89 IS - 1 N2 - BACKGROUND: Previous trials suggest that oral l-arginine administration affects endothelial function. However, most of these studies were small, the conclusions were inconsistent, and the precise effects are therefore debatable. OBJECTIVE: The objective was to assess the effect of oral l-arginine supplementation on endothelial function, as measured with the use of fasting flow-mediated dilation (FMD). DESIGN: We conducted a meta-analysis of randomized, placebo-controlled l-arginine supplementation trials that evaluated endothelial function. Trials were identified in PubMed, Cochrane Library, Embase, reviews, and reference lists of relevant papers. The weighted mean difference (WMD) was calculated for net changes in FMD by using random-effect models. Previously defined subgroup analyses and meta-regression analyses were performed to explore the influence of study characteristics. RESULTS: Thirteen trials were included and evaluated. Because there was only one long-term study, we focused on short-term effects of l-arginine (12 studies, 492 participants). In an overall pooled estimate, l-arginine significantly increased FMD (WMD: 1.98%; 95% CI: 0.47, 3.48; P = 0.01). Meta-regression analysis indicated that the baseline FMD was inversely related to effect size (regression coefficient = -0.55; 95% CI: -1.00, -0.1; P = 0.016). A subgroup analysis suggested that l-arginine supplementation significantly increased FMD when the baseline FMD levels were <7% (WMD: 2.56%; 95% CI: 0.87, 4.25; P = 0.003), but had no effect on FMD when baseline FMD was >7% (WMD: -0.27%; 95% CI: -1.52, 0.97; P = 0.67). CONCLUSION: Short-term oral l-arginine is effective at improving the fasting vascular endothelial function when the baseline FMD is low. SN - 1938-3207 UR - https://www.unboundmedicine.com/medline/citation/19056561/Increase_in_fasting_vascular_endothelial_function_after_short_term_oral_L_arginine_is_effective_when_baseline_flow_mediated_dilation_is_low:_a_meta_analysis_of_randomized_controlled_trials_ L2 - https://academic.oup.com/ajcn/article-lookup/doi/10.3945/ajcn.2008.26544 DB - PRIME DP - Unbound Medicine ER -