Abstract
Introduction
Portal vein thrombosis is a known risk among patients with cirrhosis, but the incidence of other thromboembolic events among patients with liver disease is inadequately delineated. This study examined the incidence of venous and arterial thromboembolic events in patients with cirrhosis and hepatitis C virus (HCV) infection and matched comparators.
Methods
Patients diagnosed with HCV or cirrhosis of various etiologies were identified from a large medical claims database and matched by age and sex to comparator cohorts. New-onset diagnoses of venous and arterial thromboembolic events were determined. The incidence rate of each event was calculated and rate ratios computed using Poisson regression models, adjusting for baseline factors.
Results
The study included 22,733 HCV-infected patients and 68,198 comparators, and 15,158 cirrhosis patients and 45,473 comparators. The incidence of any thromboembolic event was 233.4 events per 10,000 person-years for the HCV cohort and 138.5 per 10,000 person-years for the comparators; the adjusted incidence rate ratio for any thromboembolic event was 1.62 (95% confidence interval [CI]: 1.48–1.77). For the cirrhosis patients and comparators, the crude rates of any thromboembolic event were 561.1 and 249.7 per 10,000 person-years, respectively. The adjusted incidence rate ratio was 2.28 (95% CI: 2.11–2.47). Arterial events, especially unstable angina and transient ischemic attack, were the most frequent events seen in both the HCV and cirrhosis cohorts, but venous events, especially portal vein thrombosis, showed a more pronounced elevation in patients with liver disease.
Conclusions
Patients with HCV and cirrhosis of various etiologies are at increased risk of several types of thromboembolic events. Physicians should consider this increased risk when managing patients with liver disease.
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Acknowledgments
Sponsorship and article processing charges for this study were funded by a contract between Optum, Ann Arbor, MI and GlaxoSmithKline (GSK), Collegeville, PA. The contract granted Optum full control of the study conduct, reporting and interpretation, as well as the final wording of any resulting manuscript. All named authors meet the ICMJE criteria for authorship for this manuscript, take responsibility for the integrity of the work as a whole, and have given final approval for the version to be published. The authors wish to acknowledge Ms. Claire Chiang, M.S. at Optum (i3 Drug Safety at the time the work was performed) for her contribution to the data analysis. Medical writing assistance for this study, in the form of development of draft outline and draft manuscript, assembling of tables and figures and referencing, was provided by Dr. Beth Nordstrom, PhD at Evidera (formerly United BioSource Corporation) and funded by GlaxoSmithKline (Collegeville, PA).
Conflict of interest
Cheryl Enger reports that this work was conducted under a contract between GlaxoSmithKline and Cheryl Enger’s institution, Optum. Ulla Forssen was an employee of GSK and a GSK shareholder, now works for CSL Behring. Dimitri Bennett is an employee of GSK and is a GSK shareholder. Sumitra Shantakumar is an employee of GSK and is a GSK shareholder. Dickens Theodore is an employee of GSK and is a GSK shareholder.
Compliance with ethics guidelines
The analysis in this article is based on previously conducted studies and does not involve any new studies of human or animal subjects performed by any of the authors.
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Deceased: A. McAfee
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Enger, C., Forssen, U.M., Bennett, D. et al. Thromboembolic Events Among Patients with Hepatitis C Virus Infection and Cirrhosis: A Matched-Cohort Study. Adv Ther 31, 891–903 (2014). https://doi.org/10.1007/s12325-014-0138-4
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DOI: https://doi.org/10.1007/s12325-014-0138-4