title: Beta-adrenergic blocking agents and intermittent claudication: systematic review.
abstract: To clarify contradictions in past reports and the package inserts for beta-adrenergic blocking agents (beta-blockers) for patients with intermittent claudication (IC), we investigated the effects of beta-blockers in patients with IC using the systematic review technique. Data sources were randomized, controlled trials that investigated the effects of beta-blockers compared with the placebo or untreated group (controls) in patients with IC. Primary endpoints were walking distance and walking time, and secondary endpoints were ankle-brachial index (ABI) and calf blood flow. Nine trials were included in the analysis. Meta-analysis showed that there was a significant worsening in maximal walking distance and initial claudication distance in patients receiving beta-blockers, with standardized mean differences of -0.31 and -0.39 (95% confidence interval -0.58 to -0.04 and -0.73 to -0.06, P=0.03 and 0.02, respectively) compared with controls. There were no significant differences in maximal walking time (0.07, -0.24 to 0.37), time to onset of claudication (0.12, -0.23 to 0.47), ABI at rest (0.24, -0.30 to 0.78), calf blood flow at rest (0.00, -0.26 to 0.25), and calf blood flow after exercise (-0.23, -0.69 to 0.22). However, only one trial evaluated ABI, and the number of cases is increasing, suggesting that beta-blockers do not worsen ABI. There was no evidence that beta-blockers prescribed for patients with IC have unsuitable "precautions" in the package inserts. However, reluctance to administer beta-blockers to patients because they have IC is not appropriate.
authors.affiliation: Course of Clinical Pharmacy, Graduate School, Meiji Pharmaceutical University, Kiyose City, Tokyo 204-8588, Japan. tu6050@std.my-pharm.ac.jp
authors.forename: Ritsuko
authors.initials: R
authors.lastname: Miyajima
authors.forename: Kazumi
authors.initials: K
authors.lastname: Sano
authors.forename: Hisahiro
authors.initials: H
authors.lastname: Yoshida
mesh_terms: D000319:Adrenergic beta-Antagonists / Q000627:therapeutic use*; D000842:Ankle / Q000098:blood supply; D001783:Blood Flow Velocity; D001916:Brachial Artery; D016903:Drug Monitoring; D023381:Endpoint Determination; D015444:Exercise / Q000502:physiology; D006801:Humans; D007383:Intermittent Claudication / Q000188:drug therapy* / Q000503:physiopathology; D007866:Leg / Q000098:blood supply; D016032:Randomized Controlled Trials as Topic; D012146:Rest / Q000502:physiology; D016138:Walking
chemical_list: D000319:Adrenergic beta-Antagonists