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A systematic review and metaanalysis on the effects of garlic preparations on blood pressure in individuals with hypertension

American Journal of Hypertension, ISSN: 1941-7225, Vol: 28, Issue: 3, Page: 414-423
2015
  • 55
    Citations
  • 0
    Usage
  • 181
    Captures
  • 4
    Mentions
  • 5
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    55
    • Citation Indexes
      53
    • Clinical Citations
      1
      • PubMed Guidelines
        1
    • Policy Citations
      1
      • 1
  • Captures
    181
  • Mentions
    4
    • News Mentions
      3
      • 3
    • References
      1
      • 1
  • Social Media
    5
    • Shares, Likes & Comments
      5
      • Facebook
        5

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Review Description

Many patients prefer herbal medications to conventional drugs. Limited trial evidence suggests that garlic preparations reduce high blood pressure (BP). methods We searched electronic databases through March 2014 to identify all randomized controlled trials that compared a garlic preparation to placebo in hypertensive patients. Trials were required to report BP values at baseline and after a follow-up of at least 4 weeks. results Nine double-blind trials with 482 individuals fulfilled our inclusion criteria. Included trials were rather small, and the quality of the majority of included trials was moderate. Follow-up ranged from 8 to 26 weeks. All trials reported office BP measurements. Systolic BP and diastolic BP (SBP and DBP) were more effectively reduced in individuals treated with garlic preparations than in individuals treated with placebo. However, heterogeneity was high (weighted mean difference (WMD) for SBP was-9.1 mm Hg; 95% confidence interval (CI),-12.7 to-5.4; P for heterogeneity = 0.0006; and I = 71%; WMD for BP was-3.8 mm Hg; 95% CI,-6.7 to-1.0; P for heterogeneity = 0.00001; I = 80%). When analyses were restricted to higher-quality trials using intention-to-treat analysis or to trials with concealed treatment allocation and standardized and blinded BP measurement, effect sizes for SBP but not for DBP were lower and heterogeneity disappeared. conclusions Although evidence from this review suggests that garlic preparations may lower BP in hypertensive individuals, the evidence is not strong. A well-conducted and powered trial of longer duration is needed to confirm these findings.

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