title: Roselle for hypertension in adults.
abstract: BACKGROUND
  Hypertension is considered a serious health problem worldwide. Controlling and lowering blood pressure have a significant benefit to the hypertensive patients because hypertension is a risk factor for stroke, heart disease and cardiovascular disease. A tropical plant called Roselle, or Red Sorrel in English-speaking countries, has been used both as a thirst-quenching drink and for medical purposes.
  
  
  OBJECTIVE
  To explore the effect of Roselle on blood pressure in hypertensive adult patients.
  
  
  METHODS
  The following databases were searched (Date of most recent search was September 2009): - Cochrane Database of Systematic Reviews (2nd Quarter 2009) - DARE (2nd Quarter 2009) - Ovid MEDLINE (1950 to Present with Daily Update) - EMBASE (1980 to 2009 Week 22) - AMED (1985 to May 2009) - EBSCO CINAHL - BIOSIS (1969 to 2008) - AGRICOLA (1970 to May 2009) - Food Science and Technology Abstract (1969 to 2009 June Week 1) - International Pharmaceutical Abstracts - International Bibliographic Information on Dietary Supplements - Clinical Trials.gov and Current Controlled Trials - OpenSIGLE - Hand searching of journals - ISI Web of Knowledge
  
  
  METHODS
  We sought randomised control trials (RCTs) evaluating use of any forms of Roselle with placebo or no treatment in hypertensive patients. Change in trough and/or peak systolic and diastolic blood pressure were primary outcomes. Secondary outcomes were withdrawals due to adverse effects, change of pulse pressure and change of heart rate.
  
  
  METHODS
  Two review authors (C Ngamjarus, CN and P Pattanittum, PP) independently scanned titles and abstracts, as well as independently screened the full reports of the potentially relevant studies. At each stage, the results were compared and disagreements were solved by discussion.
  
  
  RESULTS
  No studies were identified that met the inclusion criteria. However, one abstract of an ongoing study is likely to meet the inclusion criteria, when completed.
  
  
  CONCLUSIONS
  There is insufficient evidence to support the benefit of Roselle for either controlling or lowering blood pressure in patients with hypertension. Based on the information of this review, there is a clear need to develop well-designed studies to assess the efficacy of Roselle on hypertensive patients.
authors.affiliation: Department of Biostatistics and Demography, Faculty of Public Health, Khon Kaen University, 123 Miltraparp Road, Khon Kaen, Thailand, 40002.
authors.forename: Chetta
authors.initials: C
authors.lastname: Ngamjarus
authors.forename: Porjai
authors.initials: P
authors.lastname: Pattanittum
authors.forename: Charoonsak
authors.initials: C
authors.lastname: Somboonporn
mesh_terms: D000328:Adult; D000959:Antihypertensive Agents / Q000494:pharmacology*; D001794:Blood Pressure / Q000187:drug effects*; D006801:Humans; D006973:Hypertension / Q000188:drug therapy*; D008517:Phytotherapy / Q000379:methods*; D031804:Rumex
chemical_list: D000959:Antihypertensive Agents