Insights of the RE-LY CHA2DS2-VASc subgroup analysis Hisao Ogawa Kumamoto University, Japan 1 1.

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Insights of the RE-LY CHA2DS2-VASc subgroup analysis Hisao Ogawa Kumamoto University, Japan 1 1

CHA2DS2-VASc C H A2 D S2 V A Sc 9 Maximum Score Risk factor score 1 2 Congestive heart failure/LV dysfunction 1 H Hypertension A2 Age ≥75y 2 D Diabetes mellitus S2 Stroke/TIA/TE V Vascular disease (prior myocardial infarction, peripheral artery disease, or aortic plaque) A Age 65-74y Sc Sex category (ie female gender) Maximum Score 9 CHA2DS2-VAScスコアは、2010年にLipよって提唱された、新しい脳卒中リスク評価です。年齢に重きを置き、新たに動脈疾患やSex categoryを加えた8項目、最高9点のリスク評価です。 従来のCHADS2スコアの0-1の部分がより細分化されたとの見方もできます。 今回は、この最も新しい脳卒中リスク評価におけるサブグル―プ解析が発表されました。 maximum score is 9 since age may contrubute 0, 1, or 2 points Lip GY, et al., Chest 137, 263-272, 2010 2

CHA2DS2-VASc – overall event rates Stroke and systemic embolism %/year 1 2 3 4 5 6 CHA2DS2-VASc 0-1 634 2 3408 3 5365 4 4378 5 2566 6 1185 7 451 8-9 125 No of patients

CHA2DS2-VASc – overall event rates Major (including intracranial) bleeding %/year 1 2 3 4 5 6 7 8 Intracranial Major CHA2DS2-VASc 0-1 634 2 3408 3 5365 4 4378 5 2566 6 1185 7 451 8-9 125 No of patients

The Net Clinical Benefit of warfarin by CHADS2 score 2.22 4-6 0.58 3.75 2.07 3 1.21 2.79 0.97 2 0.43 1.41 0.19 1 -0.27 0.45 従来のワルファリン療法は、CHADS2 0-1点のような低リスク患者においては、その効果と出血リスクのバランスから、積極的な推奨がなされていませんでした。 ATRIA試験における脳卒中抑制作用と頭蓋内出血リスクの解析でも、CHADS2 0-1のメリットはしめされず、CHADS2 0-1の患者に対する最適な抗血栓療法は、我々、循環器内科医の悩みでもありました。 -0.11 -0.44 -0.20 -1 -0.5 0.5 1 1.5 2 2.5 3 3.5 Worse with Warfarin Better with Warfarin Singer DE, et al. : Ann Intern Med. 151, 297-305, 2009

Stroke and systemic embolism (SE) D110 BID vs. warfarin D150 BID vs. warfarin Annual rate, % CHA2DS2-VASc D110 D150 Warfarin ≤2 0.9 0.5 0.8 3 1.3 0.8 1.4 4 1.6 1.0 2.0 5-9 2.4 2.1 2.8 p(inter)=0.81 p(inter)=0.60 0.50 1.00 1.50 0.50 1.00 1.50 Dabigatran better Warfarin better Dabigatran better Warfarin better

Intracranial bleeding D110 BID vs. warfarin D150 BID vs. warfarin Annual rate, % CHA2DS2-VASc D110 D150 Warfarin ≤2 0.15 0.11 0.38 3 0.16 0.32 0.76 4 0.29 0.21 1.04 5-9 0.32 0.63 0.84 p(inter)=0.77 p(inter)=0.09 0.50 1.00 1.50 0.50 1.00 1.50 Dabigatran better Warfarin better Dabigatran better Warfarin better

Conclusion Dabigatran has a favorable benefit risk profile Increasing CHA2DS2-VASc scores are associated with raised risks for stroke and bleeding, Irrespective of CHA2DS2-VASc scores dabigatran 150 mg was superior and dabigatran 110 mg non-inferior to warfarin for stroke prevention Both dabigatran doses reduce intracranial bleeding irrespective of CHA2DS2-VASc scores Dabigatran has a favorable benefit risk profile compared to warfarin in patients with low to high CHA2DS2-VASc scores