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Ann Rheum Dis 1999;58:257-259 ( April )

Concise reports

Effects of nabumetone compared with naproxen on platelet aggregation in patients with rheumatoid arthritis Ellen A J Knijff-Dutmer,a Alexander Martens,b Mart A F J vd Laara

a Department of Rheumatology, Medisch Spectrum Twente Enschede, the Netherlands, b Department of Clinical Laboratory, Twenteborg Hospital, Almelo, the Netherlands

Correspondence to: Dr E A J Knijff-Dutmer, Rheumatology Twente, Twenteborg Hospital, PO Box 7600, 7600 SZ Almelo, the Netherlands.

Accepted for publication 11 January 1999

OBJECTIVE---To test the hypothesis that nabumetone (a partially selective cyclo-oxygenase-(COX)-2 inhibitor) has less effect on platelet aggregation than naproxen (a non-selective COX-inhibitor) in patients with rheumatoid arthritis (RA).
METHODS---A crossover study in 10 RA patients was performed, using either nabumetone or naproxen for two weeks, and, after a washout period of two weeks, the other drug during another two weeks. Platelet aggregation studies were performed and bleeding time was assessed before and after each treatment period.
RESULTS---Maximum platelet aggregation induced by epinephrine and by collagen was significantly more reduced after the use of naproxen than of nabumetone; secondary aggregation induced by ADP and epinephrine disappeared more often by naproxen than by nabumetone. Bleeding times were not influenced.
CONCLUSION---COX dependent platelet aggregation in RA patients seems to be more inhibited by naproxen than by nabumetone. This may be relevant for patients requiring non-steroidal anti-inflammatory drug treatment but who have an increased risk of bleeding as well.

Keywords: non-steroidal anti-inflammatory drugs; platelet aggregation; rheumatoid arthritis


© 1999 by Annals of the Rheumatic Diseases



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