title: Effects of different types of antihypertensive agents on arterial stiffness: a systematic review and meta-analysis of randomized controlled trials.
abstract: BACKGROUND
  This system review and meta-analysis was conducted to systematically review and analyze the clinical benefits of different antihypertensive agents in improving arterial stiffness in hypertensive patients.
  
  
  METHODS
  PubMed database was searched for randomized controlled trials (RCTs) evaluating the effects of angiotensin receptor blockers (ARB) or other types of antihypertensive agents on pulse wave velocity (PWV). The main indicators were the improvements of PWV and augmentation index (AI) before and after randomized treatments with antihypertensive agents. For the studies that only provided the mean and standard deviation of the indicators before and after randomization, the standardized mean difference (SMD) method was directly applied to combine the mean and standard deviation of various indicators after the treatment. For the studies provided the mean and standard deviation of the changes of the indicators, the weighted mean difference (MD) method was applied to combine the mean and standard deviation of the therapeutic effect.
  
  
  RESULTS
  Ten RCT studies were included and the sample sizes range from 40 to 201 (total: 938). Four studies provided the changes of PWV before and after randomization, the pooled analysis showed that the changes of PWV in ARB group were not significantly higher than other antihypertensive agents [MD: 125.76, 95% confidence interval (CI): -78.70 to 330.23, P=0.23]; 4 studies provided the PWV values before and after randomization, the PWV values in ARB group were not significantly superior (SMD: 0.04, 95% CI: -0.16 to 0.24, P=0.71). Three studies provided the changes of AI before and after randomization, the ability of ARB to lower the level of the AI was superior to other antihypertensive agents (MD: 8.94, 95% CI: 2.18-5.71, P=0.01); 2 studies provided the AI value after randomization, the abilities of ARB and other anti-hypertensive agents to improve the AI were similar (SMD: 0.03, 95% CI: -1.20 to 1.26, P=0.06).
  
  
  CONCLUSIONS
  The effect of ARB on the improvement of the PWV level is not superior to other types of antihypertensive agents, but ARB is superior to other types of antihypertensive agents for improving the AI level. Overall, to improve of arterial stiffness, ARB maybe is superior to other antihypertensive agents.
authors.affiliation: Geriatrics Division, Department of Medicine, Peking University First Hospital, Beijing 100034, China.
authors.forename: Xiahuan
authors.initials: X
authors.lastname: Chen
authors.affiliation: Geriatrics Division, Department of Medicine, Peking University First Hospital, Beijing 100034, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Huang
authors.affiliation: Geriatrics Division, Department of Medicine, Peking University First Hospital, Beijing 100034, China.
authors.forename: Meilin
authors.initials: M
authors.lastname: Liu
authors.affiliation: Geriatrics Division, Department of Medicine, Peking University First Hospital, Beijing 100034, China.
authors.forename: Xueying
authors.initials: X
authors.lastname: Li
keywords: Hypertensive; antihypertensive agents; meta-analysis; vascular stiffness