Background: The Cochrane Hypertension Group is interested in examining characteristics contributing to some Hypertension systematic reviews being cited more often than others. Determining how often Hypertension reviews are cited in other research papers may help inform the process of selecting and updating reviews. Objectives: To ascertain how often a sample of Hypertension Group reviews are cited in other research publications; to determine whether or not there is a relationship between the number of included studies in a review and the number of times that review has been cited; to compare the number of times cited (TC) for reviews which only include pharmacological interventions with those which only include non-pharmacological interventions; to determine whether or not there is a difference between the TC for reviews in which the study population is limited to hypertensives and for those in which the study population also includes non-hypertensives. Methods: A sample of 20 Hypertension reviews will be chosen for the study. Google Scholar, which retrieves publications not yet indexed by Web of Science or Scopus, will be searched to ascertain the TC per year for each review. Attributes of frequently- and infrequently-cited Hypertension Group reviews will be examined. Results: Complete results of the study will be available in October 2010, including the total TC for all sampled reviews, average TC for each review, TC per number of included studies for each review, and the number of citations per year for each review. Conclusions: The results of the study will be used to assist the Cochrane Hypertension Group in selecting new topics for reviews and in prioritising the updating of existing reviews. Citation analysis provides insight into the characteristics of highly-cited Hypertension reviews.