Abstract
Background and Objectives
Secondary prevention of peripheral arterial disease includes administration of statins regardless of the patient’s serum cholesterol level. Our study aimed to identify patient-associated risk factors for statin non-persistence and comparison of the explanatory power of models based on clusters of patient-associated characteristics.
Methods
Our study cohort (n = 8330) was assembled from the database of the largest health insurance provider in the Slovak Republic. Statin users aged ≥ 65 years in whom peripheral arterial disease was diagnosed during 2012 were included. Patients were followed for 5 years; those with a treatment gap period of at least 6 months without statin prescription were classified as “non-persistent”. The risk factors for non-persistence were identified within six models (sociodemographic, cardiovascular events, comorbid conditions, statin-related characteristics, cardiovascular co-medication and full model) using Cox regression. The explanatory power of models was assessed using Harrell’s C-index.
Results
At the end of the follow-up, 35.7% of patients were found to be non-persistent. The full model had the highest explanatory power (C = 0.632). Female sex, atorvastatin and rosuvastatin as initially administered statins, being a new statin user and an increasing co-payment were associated with an increased risk for non-persistence. Increasing age, history of ischaemic stroke, diabetes mellitus, general practitioner as index prescriber, increasing overall number of medications and co-administration of certain cardiovascular co-medications were associated with a lower likelihood for non-persistence.
Conclusions
Patients identified as high risk for non-persistence require special attention aimed at the improvement of their persistence with statin treatment.
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Funding
This study was supported by a grant from the Scientific Grant Agency of the Ministry of Education, Science, Research and Sport of the Slovak Republic VEGA 1/0112/17. Emma Aarnio has received funding from the Finnish Cultural Foundation. The providers of these grants played no role in the study design, methodology, data collection, analysis and interpretation of the data, preparation of the paper, or in the decision to submit the manuscript.
Conflict of interest
Martin Wawruch, Gejza Wimmer Jr, Jan Murin, Martina Paduchova, Tomas Tesar, Lubica Hlinkova, Peter Slavkovsky, Lubomira Fabryova and Emma Aarnio have no conflicts of interest that are directly relevant to the content of this article.
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Wawruch, M., Wimmer, G., Murin, J. et al. Patient-Associated Characteristics Influencing the Risk for Non-Persistence with Statins in Older Patients with Peripheral Arterial Disease. Drugs Aging 36, 863–873 (2019). https://doi.org/10.1007/s40266-019-00689-2
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DOI: https://doi.org/10.1007/s40266-019-00689-2