| Warfarin-associated bleeding events and concomitant use of potentially interacting medicines reported to the Norwegian spontaneous reporting system. | |
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MedLine Citation:
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PMID: 21219407 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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AIMS: To study warfarin associated bleeding events reported to the Norwegian spontaneous reporting system and evaluate the differences in assessment of potentially interacting medicines between reporters and evaluators. METHODS: Data on bleeding events on warfarin were retrieved from the Norwegian spontaneous reporting system database. Key measurements were time to bleeding, use of concomitant medications and the evaluation done by reporters. RESULTS: In 289 case reports a total of 1261 medicines (median 4.0 per patient, range 1-17) was used. The evaluators (authors of this article) identified 546 medicines including warfarin (median 2.0 per patient, range 1-7) that could possibly cause bleeding alone or in combination. Reporters assessed 349 medicines (median 1.0 per patient, range 1-4) as suspect. Evaluators identified 156 pharmacokinetic and 101 pharmacodynamic interactions, compared with 19 pharmacokinetic and 56 pharmacodynamic interactions reported as suspected by the reporters. Time to bleeding was stated in 224 reports. Among the early bleeding events, the reports on warfarin without interacting medicines showed the highest INR (international normalized ratio). Heparin was used in 17/21 reported bleeding events during the first week on warfarin. Among the late bleeding events, reports with pharmacokinetic interacting medicines had the highest INR. CONCLUSIONS: Concomitant use of potentially interacting medicines was involved in the majority of the warfarin-associated bleeding events reported to the Norwegian spontaneous reporting system. Reporters assessed mostly warfarin as the only contributor to bleeding. In particular, pharmacokinetically interacting medicines were not suspected as contributing to bleeding. |
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Authors:
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Sigrid Narum; Vigdis Solhaug; Kirsten Myhr; Per Wiik Johansen; Odd Brørs; Marianne Kristiansen Kringen |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: British journal of clinical pharmacology Volume: 71 ISSN: 1365-2125 ISO Abbreviation: Br J Clin Pharmacol Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-01-11 Completed Date: 2011-03-29 Revised Date: 2012-02-01 |
Medline Journal Info:
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Nlm Unique ID: 7503323 Medline TA: Br J Clin Pharmacol Country: England |
Other Details:
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Languages: eng Pagination: 254-62 Citation Subset: IM |
Copyright Information:
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© 2011 The Authors. British Journal of Clinical Pharmacology © 2011 The British Pharmacological Society. |
Affiliation:
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Department of Pharmacology, Oslo University Hospital, Oslo, Norway. sigrid.narum@studmed.uio.no |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Adverse Drug Reaction Reporting Systems Age Distribution Aged Aged, 80 and over Anticoagulants / administration & dosage, adverse effects* Drug Administration Schedule Drug Interactions Female Hemorrhage / chemically induced*, epidemiology Humans International Normalized Ratio Male Middle Aged Norway / epidemiology Warfarin / administration & dosage, adverse effects* |
| Chemical | |
Reg. No./Substance:
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0/Anticoagulants; 81-81-2/Warfarin |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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