Healthcare disparities in quality represent one of the greatest challenges in achieving uniformly high-quality care (1). Research reporting disparities in surgical outcomes are abundant (2-6). The cornerstone of delivering high quality healthcare is ensuring optimal access for all patients. A relative lack of access to surgical services may be a contributing factor to disparities in surgical outcomes.Access is "the timely use of personal health services to achieve the best possible outcomes" (7). Utilization of services, the process of entering and staying in the system, and the actual quality of care received are all involved. Disparities in access arise when the system disproportionately under-performs for a specific group of patients relative to the historically

Key Points Question Can a risk score for sustained prescription opioid use after surgery be developed for a working-age population using readily available clinical information? Findings In this case-control study of 86 356 patients undergoing 1 of 10 common surgical procedures, prior opioid exposure was the factor most strongly associated with sustained opioid use. The group with the lowest Stopping Opioids After Surgery scores (<31) had a mean 4.1% risk of sustained opioid use; the group with intermediate scores (31-50) had a mean risk of 14.9%; and the group with the highest scores (>50) had a mean risk of 35.8%. Meaning The scoring system developed in this study may inform the risk of sustained prescription opioid use after surgery and be scalable to clinical practice.

BackgroundWith limited health care resources, bibliometric studies can help guide researchers and research funding agencies towards areas where reallocation or increase in research activity is warranted. Bibliometric analyses have been published in many specialties and sub-specialties but our literature search did not reveal a bibliometric analysis on Cardiovascular Magnetic Resonance (CMR). The main objective of the study was to identify the trends of the top 100 cited articles on CMR research.MethodsWeb of Science (WOS) search was used to create a database of all English language scientific journals. This search was then cross-referenced with a similar search term query of Scopus® to identify articles that may have been missed on the initial search. Articles were ranked by citation count and screened by two independent reviewers.ResultsCitations for the top 100 articles ranged from 178 to 1925 with a median of 319.5. Only 17 articles were cited more than 500 times, and the vast majority (n = 72) were cited between 200–499 times. More than half of the articles (n = 52) were from the United States of America, and more than one quarter (n = 21) from the United Kingdom. More than four fifth (n = 86) of the articles were published between the time period 2000–2014 with only 1 article published before 1990. Circulation and Journal of the American College of Cardiology made up more than half (n = 62) of the list. We found 10 authors who had greater than 5 publications in the list.ConclusionOur study provides an insight on the characteristics and quality of the most highly cited CMR literature, and a list of the most influential references related to CMR.Electronic supplementary materialThe online version of this article (doi:10.1186/s12968-016-0303-9) contains supplementary material, which is available to authorized users.