Abstract:
OBJECTIVE:To assess the representativeness of the Heart Protection Study (HPS) and the Collaborative Atorvastatin Diabetes Study (CARDS) for incident statin users. DESIGN:A population-based analysis with linked register data. SETTING:Finland. POPULATION:56 963 patients with diabetes initiating statin use from 2005 to 2008. MAIN OUTCOME MEASURES:We determined the proportions of real-world patients who fulfilled the eligibility criteria for HPS and CARDS trials and assessed the cardiovascular disease (CVD) event rates, assumed to reflect the background CVD risk, for those eligible and ineligible. We used descriptive statistics to identify the patient characteristics, lipid-lowering interventions and adherence to statin therapy. RESULTS:Of the real-world patients, 57% (N=32 582) fulfilled the eligibility criteria for HPS (DM) and 49% (N=20 499) of those without CVD for CARDS. The patients ineligible for HPS (DM) had a higher cumulative risk for CVD events than those eligible, whereas regarding CARDS the cumulative risks were of similar magnitude. The overall CVD event rates seemed to be comparable to those in the reviewed trials. Both trials were under-representative of women and users of antihypertensive agents and metformin. 27% and 29% of real-world patients had an initial statin dose corresponding to <20 mg of simvastatin. The proportions of patients who were deemed adherent were 57% in the real world and 85% in both trials. CONCLUSIONS:Only half of the real-world patients would have qualified for the HPS (DM) and CARDS, limiting their representativeness for clinical practice. Women and users of antihypertensive agents and metformin were under-represented in both trials. These deviations reflect the changes in diabetes treatment over the years and are not expected to modify the average treatment effects of statins on CVD. Prescribing of lower statin doses in clinical practice than used in the trials and lower adherence may, however, attenuate the benefits in the real world.
journal_name
BMJ Openjournal_title
BMJ openauthors
Ruokoniemi P,Sund R,Arffman M,Helin-Salmivaara A,Huupponen R,Keskimäki I,Vehko T,Korhonen MJdoi
10.1136/bmjopen-2014-005402subject
Has Abstractpub_date
2014-06-19 00:00:00pages
e005402issue
6issn
2044-6055pii
bmjopen-2014-005402journal_volume
4pub_type
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