title: Reporting of consistency of blood pressure control in randomized controlled trials of antihypertensive drugs:  a systematic review of 1372 trial reports.
abstract: OBJECTIVE
  Hypertension is a powerful treatable risk factor for stroke. Reports of randomized controlled trials (RCTs) of antihypertensive drugs rightly concentrate on clinical outcomes, but control of blood pressure (BP) during follow-up is also important, particularly given that inconsistent control is associated with a high risk of stroke and that antihypertensive drug classes differ in this regard.
  
  
  METHODS
  We performed a systematic review of reporting of BP control in RCTs of antihypertensive drugs. We searched bibliographic databases (1950-2009) for systematic reviews of RCTs of BP-lowering and identified the main report of all trials.
  
  
  RESULTS
  We identified 94 larger trials (>100 participants/arm, >1-year follow-up) and 1278 smaller/shorter trials. Ninety-one (96.8%) larger trials reported some data on mean BP during follow-up, but none reported effects on the consistency of control of BP over time. Although 81 (86.2%) larger trials reported group distribution of BP at baseline (usually SD), only 22 (23.4%) reported such data at any follow-up visit. Eleven (11.7%) larger trials reported group distribution of the change in BP from baseline to follow-up, but 61 (64.9%) reported no data at all on group distribution of BP at follow-up. Thirty-nine (41.5%) trials reported the proportion of patients reaching some BP target during follow-up, but no trial reported data on the consistency of control to target within individuals over time. Similar proportions were observed in the 1278 smaller/short trials.
  
  
  CONCLUSIONS
  Reporting of BP control is limited in RCTs of BP-lowering drugs. We suggest reporting guidelines.
authors.affiliation: Stroke Prevention Research Unit, University Department of Clinical Neurology, John Radcliffe Hospital, Oxford, UK.
authors.forename: Urs
authors.initials: U
authors.lastname: Fischer
authors.forename: Alastair J S
authors.initials: AJ
authors.lastname: Webb
authors.forename: Sally C
authors.initials: SC
authors.lastname: Howard
authors.forename: Peter M
authors.initials: PM
authors.lastname: Rothwell
mesh_terms: D000959:Antihypertensive Agents / Q000627:therapeutic use*; D001794:Blood Pressure; D006801:Humans; D006973:Hypertension / Q000188:drug therapy*; D016032:Randomized Controlled Trials as Topic
chemical_list: D000959:Antihypertensive Agents