e0412 Obstructive sleep apnea syndrome is associated with increased risk of low-antiplatelet response of clopidogrel in patients with unstable angina

Objective To address the relationship between low antiplatelet response of clopidogrel and Obstructive Sleep Apnea Syndrome (OSAS) in patients with unstable angina pectoris. Methods Total of 112 patients hospitalised with unstable angina pectoris from February 2008 to December 2009 were enrolled in this randomised consecutive study. All patients accepted routine treatment including clopidogrel, aspirin, low molecular weight heparin daily. Platelet aggregation (PAR) parameters were measured on samples obtained at baseline and 2 nd , 4 th , 6 th day. All patients were examined for the presence of sleep-disordered breath into 4 quartiles by ApneaLink. The concentration serum adrenaline and norepinephrine were measured in the morning at 6 a.m. after the sleep study. Result There were no significant differences in the baseline data in all 4 quartiles. However, there was a significant differences in the number of diabetes patients in the first quartibesity, heale (p=0.0038) compared with other quartiles. At day 2 PAR were inhibited to 63.91% of baseline (p 0.05) of baselinctively, in the first quartile. At each of these time points, platelet activity was significantly higher than in patients in other quartiles. At day 6 platelet aggregation were reduced to 32.37%, and 29.75% of baseline respectively in group 2 through 4 (p 0.05). Compared with that in thebidity of OSAS in the second and third were 25.0% and 14.3% (p Conclusion OSAS is aicator of low clopidogrel response in unstable angina patients, and higher concentration of epinephrine and norepinephrine in OSAS pa reliable ind tients plaorepinephry a more important role in this situation.