JP6028983B2 - ビダラビンによる心房細動治療 - Google Patents
ビダラビンによる心房細動治療 Download PDFInfo
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- JP6028983B2 JP6028983B2 JP2013537448A JP2013537448A JP6028983B2 JP 6028983 B2 JP6028983 B2 JP 6028983B2 JP 2013537448 A JP2013537448 A JP 2013537448A JP 2013537448 A JP2013537448 A JP 2013537448A JP 6028983 B2 JP6028983 B2 JP 6028983B2
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- Prior art keywords
- vidarabine
- atrial fibrillation
- day
- administration
- arrhythmia
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/70—Carbohydrates; Sugars; Derivatives thereof
- A61K31/7042—Compounds having saccharide radicals and heterocyclic rings
- A61K31/7052—Compounds having saccharide radicals and heterocyclic rings having nitrogen as a ring hetero atom, e.g. nucleosides, nucleotides
- A61K31/706—Compounds having saccharide radicals and heterocyclic rings having nitrogen as a ring hetero atom, e.g. nucleosides, nucleotides containing six-membered rings with nitrogen as a ring hetero atom
- A61K31/7064—Compounds having saccharide radicals and heterocyclic rings having nitrogen as a ring hetero atom, e.g. nucleosides, nucleotides containing six-membered rings with nitrogen as a ring hetero atom containing condensed or non-condensed pyrimidines
- A61K31/7076—Compounds having saccharide radicals and heterocyclic rings having nitrogen as a ring hetero atom, e.g. nucleosides, nucleotides containing six-membered rings with nitrogen as a ring hetero atom containing condensed or non-condensed pyrimidines containing purines, e.g. adenosine, adenylic acid
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P9/00—Drugs for disorders of the cardiovascular system
- A61P9/06—Antiarrhythmics
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Public Health (AREA)
- Pharmacology & Pharmacy (AREA)
- Veterinary Medicine (AREA)
- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- Medicinal Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Cardiology (AREA)
- Heart & Thoracic Surgery (AREA)
- Molecular Biology (AREA)
- Epidemiology (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
Description
(1)ビダラビン、医薬的に許容されるその塩又は溶媒和物を含む抗不整脈薬。
(2)ビダラビン、医薬的に許容されるその塩又は溶媒和物の医薬的に有効な量を被験者に投与することを含む、不整脈を予防及び/又は治療する方法。
(3)不整脈の予防及び/又は治療のためのビダラビン、医薬的に許容されるその塩又は溶媒和物の使用。
(4)不整脈を予防及び/又は治療する方法に使用するためのビダラビン、医薬的に許容されるその塩又は溶媒和物。
イソフルレン(Sigma社)を用いてマウスを吸入麻酔後、心内心電図を記録する目的で口腔内から心電図アンプに接続した電極カテーテルをゆっくりと食道に挿入し、P波が最も大きく記録される部位で電極カテーテル(Miller社)を固定した。固定した電極カテーテルは位置が動かないように慎重に電気刺激装置に接続し、同時に心電図アンプには体表面心電図をII誘導の位置で記録した。つぎに心房-心室ペーシングに必要な最小の電圧(閾値)の1.5倍の電圧を60msecで30秒間加えることで心房細動を誘発した (Circ Res 97, 62-69, 2005)。
1.投与プロトコール
対象
1)心臓外科開心術術後症例
2)20歳以上
3)除外基準
(1)相互作用を有する薬剤(ペントスタチン、アロプリノール)使用中の患者
(2)腎機能障害(eGFR<50)
(3)術前に心房細動を有する症例
評価項目
主要評価項目
1)ビダラビン投与開始から心房細動停止までの時間
2)ビダラビン投与による心房細動停止率
副次的評価項目
1)ビダラビン有効症例における心房細動再発(回避)率
投与方法
1)術後新規心房細動発症
2)ビダラビン1バイアル(300mg)を5%ブドウ糖250mlに溶解して3時間かけて投与
3)投与開始4時間後(投与終了1時間後)に効果判定
ビダラビン初回有効例:心房細動再発の有無を観察
1)再発が見られた場合
(1)ビダラビンを再投与:合計3回まで 効果再判定
2)再発が見られなかった場合:経過観察
ビダラビン初回無効例:
1)既存の治療法を開始(抗不整脈薬などによる)
症例1:
82歳男性
診断名:大動脈閉鎖不全
術式: 大動脈弁置換術を平成24年3月9日に施行
術後経過:
1)平成24年3月11日18時20分に心房細動発症を確認。18時39分よりビダラビン投与開始。20時15分に洞調律に回復した。 有効
2)平成24年3月12日23時56分に心房細動発症(再発)を確認。3月13日0時0分よりビダラビン投与開始。3月13日4時0分の時点で洞調律回復せず。 無効
4月10日退院。
80歳男性
診断名;大動脈弁狭窄
術式:大動脈弁置換術を平成24年3月26日に施行。
術後経過:
平成24年4月2日13時0分に心房細動発症を確認。平成24年4月4日9時0分よりビダラビン投与開始。4月4日13時0分の時点で洞調律回復せず。 無効
4月17日退院。
73歳男性
診断名:胸部大動脈瘤
術式:ステントグラフト内挿術を平成24年7月13日に施行。
術後経過:
平成24年7月16日1時30分に心房細動発症を確認。平成24年7月16日8時50分より投与開始。12時50分の時点で洞調律に回復せず。 無効
1)平成24年3月11日より7月21日現在までにのべ4回の開心術後心房細動に対してビダラビン治療が行われた。有効症例は1例のみであったため有効率は25%(1/4)であり有効性は認められた。
2)現在のプロトコールに関して有効性が確認しやすいプロトコールに変更していくことも考慮するとよいであろう。
3)現在のプロトコールは300mgの単回投与であるため、成人60kgとして勘算すると5mg/kg/dayとなる。動物実験で使用された投与量は15mg/kg/dayであることを考慮すると投与量を増加させることも検討するとよいであろう。ヒトへの投与量は15mg/kg/dayで最長10日間まで投与可能である(アラセナAインタビューフォームより)。どの程度投与量を増加するかの指標としてマウスで15mg/kg/dayを投与したときのビダラビン血中濃度を測定し、相当量の血中濃度がヒトの場合どの程度で得られるかを一つの指標とするとよいであろう。
4)開心術後の心房細動発症例に対して投与を行っているため現プロトコールは心房細動の停止効果を確認している。開心術後の心房細動に対するベータ遮断薬の有用性は開心術前あるいは術直後からの投与を行う心房細動発症予防効果についてはAHAガイドライン2004で高く推奨されている。今後症例を増やしても停止効果に関して有効性が確認されない場合は現プロトコールを予防効果を確認するのに変更することも考慮していくとよいであろう。
5)ベータ遮断薬の開心術前の投与に関しては心機能や呼吸機能に対する抑制効果も懸念されるためその投与に際しては慎重に行うことが必要である。ビダラビンの開心術前あるいは術直後からの投与により術後の心房細動発症予防効果が確認されれば心機能や呼吸機能に懸念することなく高齢患者にも投与可能な治療薬になることが期待される。
Claims (2)
- ビダラビン、医薬的に許容されるその塩又は溶媒和物を含む抗不整脈薬。
- 1日あたり5〜15 mg/kg(体重)のビダラビン、医薬的に許容されるその塩又は溶媒和物が投与されるように用いられる、請求項1記載の抗不整脈薬。
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