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Not taking gastroprotective drugs prescribed with anti-inflammatory medicines

16.04.2012
Increases risk of upper GI complications

To relieve pain, arthritis sufferers are prescribed medications that may include non-steroidal anti-inflammatory drugs (NSAIDs) or cyclooxygenase-2 (COX-2) inhibitors, both of which can irritate the digestive tract.

At times additional drugs are co-prescribed with NSAIDs or COX-2 inhibitors to prevent adverse gastrointestinal (GI) effects. Now a new study available today in the American College of Rheumatology journal, Arthritis & Rheumatism, reveals that decreasing gastroprotective agent (GPA) adherence among users of COX-2 inhibitors is linked to an increased risk of such upper GI complications.

Current clinical guidelines recommend that GPAs, such as proton pump inhibitors (PPIs) or misoprostol, be prescribed to patients taking NSAIDs and COX-2 inhibitors—also known as COX-2 blockers—who are at high risk of upper GI events. Previous research shows that in NSAID users who fail to adhere to the GPA regimen, the protective effect of GPA drugs is diminished. However, limited evidence is available regarding the effect of adherence to a gastroprotective drug regimen with COX-2 blocker use, and is the focus of the current investigation led by Dr. Vera Valkhoff with Erasmus University Medical Center in the Netherlands.

Dr. Valkhoff and colleagues analyzed data from population-based primary care registries in the United Kingdom, the Netherlands, and Italy between 1996 and 2008. The study group included 14,416 patients 50 years of age or older who were prescribed COX-2 inhibitors and GPAs. Researchers calculated GPA adherence as the proportion of the COX-2 blocker treatment days covered by a GPA prescription. Cases were part of the COX-2 blocker plus GPA group who had an upper GI complication (GI bleeding or symptomatic ulcer) which included 16,442 episodes.

Researchers noted that of the COX-2 blockers prescribed 43% of participants used celecoxib (Celebrex), 41% rofecoxib (Vioxx),1 and 15% etoricoxib (Arcoxia),2 with most patients using these drugs for less than 30 days. During the study 74 patients had an upper GI event, resulting in an incidence rate of 11.9 per 1,000 COX-2 inhibitor user years. Results showed that the risk of upper GI complication was higher in low GPA adherers (GPA was taken on average one out of five days of COX-2 blocker use, or less) compared to full adherers (GPA was taken four out of five days of COX-2 inhibitor use, or more).

Further analysis found that for every 10% decrease in GPA adherence, there was a 9% increase in the risk of gastrointestinal complications. "Our findings show that with every three day reduction of GPA coverage per 30 days of COX-2 inhibitor use, the risk of upper GI events increases 9%," concludes Dr. Valkhoff. "This study confirms the benefits of GPA adherence in reducing risk of upper GI complications from use of COX-2 blockers." The authors point out that GPA adherence is important in reducing risk of upper GI events with COX-2 blockers, and non-adherence is a modifiable risk factor while conventional risk factors such as a prior GI event or use of anticoagulant therapy are not.

1 In May 1999 the Federal Drug Administration (FDA) approved rofecoxib (Vioxx) for treatment of osteoarthritis (OA) and later approved to relieve symptoms of rheumatoid arthritis (RA). In September 2004 Merck & Co., Inc. withdrew the drug from U.S. and worldwide markets due to increased risk of heart attack and stroke in patients using rofecoxib according to the FDA postmarket drug safety information.

2 Etoricoxib (Arcoxia) is not available in the U.S.

This study is published in Arthritis & Rheumatism. Media wishing to receive a PDF of this article may contact healthnews@wiley.com

Full citation: "Adherence to Gastroprotection During Cyclooxygenase-2 Inhibitor Use and the Risk of Upper Gastrointestinal Events: A Population-based Study." Vera E Valkhoff, Eva M van Soest, Giampiero Mazzaglia, Mariam Molokhia, Rene Schade, Gianluca Trifiro, Jay L Goldstein, Sonia Hernandez-Diaz, Ernst J Kuipers, Miriam C J M Sturkenboom. Arthritis & Rheumatism; Published Online: April 16, 2012 (DOI: 10.1002/art.34433).

Author Contacts: To arrange an interview with Dr. Vera Valkhoff or Dr. Miriam Sturkenboom, please contact David Drexhage with Erasmus MC at d.drexhage@erasmusmc.nl.

About the Journal:

Arthritis & Rheumatism is an official journal of the American College of Rheumatology (ACR) and the Association of Rheumatology Health Professionals (ARHP), a division of the College, and covers all aspects of inflammatory disease. The American College of Rheumatology (http://www.rheumatology.org) is the professional organization who share a dedication to healing, preventing disability, and curing the more than 100 types of arthritis and related disabling and sometimes fatal disorders of the joints, muscles, and bones. Members include practicing physicians, research scientists, nurses, physical and occupational therapists, psychologists, and social workers. The journal is published by Wiley-Blackwell on behalf of the ACR. For more information, please visit http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1529-0131.

About Wiley-Blackwell:

Wiley-Blackwell is the international scientific, technical, medical, and scholarly publishing business of John Wiley & Sons, with strengths in every major academic and professional field and partnerships with many of the world's leading societies. Wiley-Blackwell publishes nearly 1,500 peer-reviewed journals and 1,500+ new books annually in print and online, as well as databases, major reference works and laboratory protocols. For more information, please visit http://www.wileyblackwell.com or our new online platform, Wiley Online Library (http://www.wileyonlinelibrary.com), one of the world's most extensive multidisciplinary collections of online resources, covering life, health, social and physical sciences, and humanities.

Dawn Peters | EurekAlert!
Further information:
http://www.wiley.com

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