Abstract
Introduction
The potential for routine sequence symmetry analysis (SSA) signal detection in health claims databases to detect new safety signals of medicines is unknown.
Objective
Our objective was to assess the potential utility of SSA as a signal detection tool in health claims data for detecting medicines with potential heart failure (HF) adverse event signals.
Methods
We applied the SSA method to all subsidized single-ingredient medicines in Australia. The source of data was the Australian Government Department of Veterans’ Affairs (DVA) administrative claims database using data collected between 2002 and 2011. We used first ever HF hospitalization and frusemide initiation as indicators for HF. A signal was considered to be present if the lower limit of the 95 % confidence interval for the adjusted sequence ratio was greater than one. To identify potential new signals of HF, we excluded medicines where HF or edema was listed in the product information (PI) of that medicine or for any other medicine in the same class. We also excluded medicines that were used in HF treatment and medicines indicated for diseases that may contribute to the development of HF.
Results
We tested 691 medicines. HF signals were detected for 12 % (80/691) using the hospitalization event and 22 % (153/691) using frusemide initiation. Among medicines that did not have HF listed in the PI, SSA found 11 % (44/397) associated with HF hospitalization and 15 % (60/397) associated with frusemide initiation. Of the medicines tested in which no other medicine in the same class had HF or edema in the PI, and where the medicine was not indicated for a disease that is a risk factor for HF, potential new signals were generated for 2–3 % of these medicines tested (12 of 397 medicines using HF hospitalization and 9 of 397 medicines using frusemide initiation).
Conclusion
SSA generated potential new signals of HF for some anti-glaucoma and anti-dyspepsia medicines. For some of the potential signals, the event is biologically plausible and some have pre-marketing and post-marketing case reports to support the finding. Confirmation of these signals using cohort studies is required.
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Acknowledgments
The authors thank DVA for providing the data used in this study. We would also like to thank the Uppsala Monitoring Centre for providing prostaglandin eye drop ADR reports. The supplied data come from a variety of sources, including both regulated and voluntary sources. The likelihood of a causal relationship is not the same in all reports. The study results, discussion, and conclusion are those of the authors and do not represent the opinion of the World Health Organization.
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This work is funded by a National Health and Medical Research Centre (NHMRC) Grant, Centre of Research Excellence in post-marketing surveillance of medicines and medical devices GNT 1040938. Nicole Pratt is supported by an NHMRC Early Career Research Fellowship GNT 1035889. Dr. Izyan A. Wahab was supported by a Malaysian Government PhD scholarship.
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Izyan A. Wahab, Nicole L. Pratt, Lisa Kalisch Ellett, and Elizabeth E. Roughead have no conflicts of interest that are directly relevant to the content of the manuscript.
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Wahab, I.A., Pratt, N.L., Ellett, L.K. et al. Sequence Symmetry Analysis as a Signal Detection Tool for Potential Heart Failure Adverse Events in an Administrative Claims Database. Drug Saf 39, 347–354 (2016). https://doi.org/10.1007/s40264-015-0391-8
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DOI: https://doi.org/10.1007/s40264-015-0391-8