今日の臨床サポート 今日の臨床サポート

著者: 藤井泰宏 岡山大学病院新医療研究開発センター

監修: 伊藤浩 川崎医科大学総合内科学3教室

著者校正/監修レビュー済:2024/08/07
患者向け説明資料

改訂のポイント:
  1. 『JCS/JSVS 2022年改訂版末梢動脈疾患ガイドライン』を参照に、下記の点を加筆・修正した。
  1. 疫学情報と「さまざまなリスクファクターを念頭に置いた慎重な全⾝管理を要する疾患である」ことを追記
  1. 原因疾患について、塞栓症では「拡張型心筋症」、血栓症では「血管ステント内に発生した血栓」を追加
  1. アルゴリズムを更新
  1. 「コンパートメント症候群」の項目を追加
  1. フォローアップにおける抗凝固治療について記載追加

概要・推奨   

  1. 脈拍の触診や身体所見は精度に欠けるため、急性動脈閉塞が疑われる患者はすべて、症状発現後速やかに末梢の脈拍をドプラーで評価するべきである(推奨度1)
  1. 急性下肢虚血が疑われるすべての患者は、神経と筋肉の不可逆的損傷が数時間以内に起こる可能性があるため、速やかに治療方針の決定をして血行再建術を施行できる血管専門医による診断を受けるべきである。
  1. すべての急性下肢虚血の患者において、即時の非経口抗凝固療法が適応となる。緊急画像診断、治療を受ける予定の患者にはヘパリンを投与すべきである(推奨度1)
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  1. 閲覧にはご契約が必要となります。閲覧にはご契約が必要となります。閲覧にはご契約が必要となります。閲覧
  1. 閲覧にはご契約が必要となります。閲覧にはご契約が必要となります。閲覧にはご契約が必要となります。閲覧にはご契約が必要となります。閲覧にはご契約が必要となります。閲覧にはご契約が必要となります。閲覧にはご契約が必要となります。閲覧にはご契約が必要となります。閲

病態・疫学・診察 

疾患情報(疫学・病態)  
  1. 急性動脈閉塞症とは、主幹動脈が、血栓や塞栓により突然閉塞を起こす病態で、閉塞部位と重症度に応じた対応が必要である。
  1. National Clinical Database(NCD)登録症例に基づく日本血管外科学会による血管外科手術アニュアルレポート2014年では、塞栓症が45.0%、血栓症が55.0%である。
  1. 四肢の急性動脈閉塞症は、完全閉塞の場合、6~8時間で筋組織が不可逆変化を起こし切断に至る危険を有し、また、生命への危険が及ぶ場合もあり得る重篤な病態である。
  1. 上腸間膜動脈の急性閉塞症は、腸管壊死を引き起こす可能性があり、急性発症の激しい腹痛では疑う必要がある。(上腸間膜動脈閉塞症について、詳しくは上腸間膜動脈閉塞症・上腸間膜静脈血栓症の項参照)
  1. 閉塞部位を判断するとともに重症度を診断し、観血的治療の時期を逸しないことが肝要である。
  1. 局所治療のみならず、患者の高齢化や併存疾患など、さまざまなリスクファクターを念頭に置いた慎重な全身管理を要する疾患である。
症状兆候  
四肢動脈:
  1. 急性動脈閉塞の症状としては“5P”、すなわち疼痛(pain)、脈拍消失(pulselessness)、蒼白(pallor/paleness)、知覚鈍麻(paresthesia)、運動麻痺(paralysis/paresis)、または、これらに虚脱(prostration)を加えた“6P”がよく知られている)。
  1. 原因にかかわらず肢切断に至る可能性があるが、側副血行路の発達していない塞栓症や外傷によるものでは急激な経過をたどり、血栓症で発達した側副血行が温存されている場合には比較的遅い経過をたどる。下肢においては動脈拍動の有無、動・静脈のドプラシグナルの有無とともに知覚消失や安静時疼痛の存在、筋力低下の有無が肢虚血の可逆性を判別するのに有用な徴候となる。

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文献 

日本脈管学会編:下肢閉塞性動脈硬化症の診断・治療指針 TASCⅡ. 推奨事項29. 急性下肢虚血(ALI)の評価..
KASIRAJAN,MD,FACS, OURIEL,MD.FACS,FACC Acute Limb Ischemia Rutherford Vascular Surgery 6th ed SAUNDERS 2005 Chapter66 p960.
Cambria RP, Brewster DC, Gertler J, Moncure AC, Gusberg R, Tilson MD, Darling RC, Hammond G, Mergerman J, Abbott WM.
Vascular complications associated with spontaneous aortic dissection.
J Vasc Surg. 1988 Feb;7(2):199-209.
Abstract/Text Three hundred twenty-five cases of spontaneous aortic dissection seen at two institutions between 1965 and 1986 were reviewed to assess the incidence, morbid sequelae, and specific management of aortic branch compromise. Noncardiac vascular complications occurred in 33% of the study group, and in these patients the overall mortality rate (51%) was significantly (p less than 0.001) higher than in patients without (29%) such complications. Although aortic rupture was the strongest correlate of mortality (90%), death specifically related to vascular occlusion was common when such occlusion occurred in the carotid, mesenteric, and renal circulation. There was a strong correlation between stroke and carotid occlusion (22/26 cases), yet specific carotid revascularization was only used during the chronic phase of the disease. Similarly, peripheral operation was ineffective in reducing the mortality rate in the setting of mesenteric (87%) and renal (50%) ischemia. Fifteen patients required either fenestration or graft replacement of the abdominal aorta for acute obstruction, rupture, or chronic aneurysm development. Thirty-eight patients (12%) demonstrated some degree of lower extremity ischemia, and one third of these required a direct approach on the abdominal aorta or iliofemoral segments to restore circulation. Selected patients with acute aortic dissection may require peripheral vascular operation in accordance with a treatment strategy that directs initial attention to the immediate life-threatening complications.

PMID 3276932
日本脈管学会編:下肢閉塞性動脈硬化症の診断・治療指針 TASCⅡ.推奨事項30. 急性下肢虚血を疑う症例..
日本脈管学会編:下肢閉塞性動脈硬化症の診断・治療指針 TASCⅡ.推奨事項31..
Ouriel K, Veith FJ, Sasahara AA.
A comparison of recombinant urokinase with vascular surgery as initial treatment for acute arterial occlusion of the legs. Thrombolysis or Peripheral Arterial Surgery (TOPAS) Investigators.
N Engl J Med. 1998 Apr 16;338(16):1105-11. doi: 10.1056/NEJM199804163381603.
Abstract/Text BACKGROUND: Recent controlled trials suggest that thrombolytic therapy may be an effective initial treatment for acute arterial occlusion of the legs. A major potential benefit of initial thrombolytic therapy is that limb ischemia can be managed with less invasive interventions.
METHODS: In this randomized, multicenter trial conducted at 113 North American and European sites, we compared vascular surgery (e.g., thrombectomy or bypass surgery) with thrombolysis by catheter-directed intraarterial recombinant urokinase; all patients (272 per group) had had acute arterial obstruction of the legs for 14 days or less. Infusions were limited to a period of 48 hours (mean [+/-SE], 24.4+/-0.86), after which lesions were corrected by surgery or angioplasty if needed. The primary end point was the amputation-free survival rate at six months.
RESULTS: Final angiograms, which were available for 246 patients treated with urokinase, revealed recanalization in 196 (79.7 percent) and complete dissolution of thrombus in 167 (67.9 percent). Both treatment groups had similar significant improvements in mean ankle-brachial blood-pressure index. Amputation-free survival rates in the urokinase group were 71.8 percent at six months and 65.0 percent at one year, as compared with respective rates of 74.8 percent and 69.9 percent in the surgery group; the 95 percent confidence intervals for the differences were -10.5 to 4.5 percentage points at six months (P=0.43) and -12.9 to 3.1 percentage points at one year (P=0.23). At six months the surgery group had undergone 551 open operative procedures (excluding amputations), as compared with 315 in the thrombolysis group. Major hemorrhage occurred in 32 patients in the urokinase group (12.5 percent) as compared with 14 patients in the surgery group (5.5 percent) (P= 0.005). There were four episodes of intracranial hemorrhage in the urokinase group (1.6 percent), one of which was fatal. By contrast, there were no episodes of intracranial hemorrhage in the surgery group.
CONCLUSIONS: Despite its association with a higher frequency of hemorrhagic complications, intraarterial infusion of urokinase reduced the need for open surgical procedures, with no significantly increased risk of amputation or death.

PMID 9545358
Berridge DC, Kessel D, Robertson I.
Surgery versus thrombolysis for acute limb ischaemia: initial management.
Cochrane Database Syst Rev. 2002;(3):CD002784. doi: 10.1002/14651858.CD002784.
Abstract/Text BACKGROUND: Peripheral arterial thrombolysis is a useful technique for the management of peripheral arterial ischaemia. Much is known about the indications, risks and benefits of thrombolysis, although data from randomised controlled studies are not extensive. However, it is not known whether thrombolysis works better than surgery in the initial treatment of acute limb ischaemia.
OBJECTIVES: To determine the preferred initial treatment, surgery or thrombolysis, for acute limb ischaemia.
SEARCH STRATEGY: The Cochrane Controlled Trials Register (Issue 3, 2001), and the Specialised Trials Register of the Cochrane Peripheral Vascular Diseases Group (September 2001) were searched. Proceedings from all British Vascular Surgical Society, European Vascular Surgical Society and North American Society of Vascular Surgery meetings, Society of Cardiovascular and Interventional Radiology (SCVIR) and Cardiovascular and Interventional Society of Europe (CIRSE), were handsearched. Pharmaceutical firms and trialists were asked for information about unpublished trials.
SELECTION CRITERIA: All randomised studies comparing thrombolysis and surgery in the initial management of acute limb ischaemia.
DATA COLLECTION AND ANALYSIS: Assessment of trial quality and data extraction was done independently by all reviewers.
MAIN RESULTS: Five trials with a total of 1,283 patients were included. Two trials used a list of procedures of increasing severity of intervention. If lytic treatment were successful, further intervention might prove unnecessary. There was no significant difference in limb salvage or death at 30 days, six months or one year between initial surgery and initial thrombolysis. However, with initial lysis, stroke was significantly more frequent at 30 days, 8/640 patients compared to 0/540 patients receiving initial surgery [Odds ratio (95% CI) 6.41(1.57, 26.22)]; major haemorrhage was more likely at 30 days, 52/588 versus 16/482 [Odds ratio (95% CI) 2.80 (1.70, 4.60)]; and distal embolisation was more likely at 30 days, 42/340 versus 0/338 [Odds ratio (95% CI) 8.35 (4.47, 15.58)]. Patients treated by initial lysis underwent a less severe degree of intervention [Odds ratio (95% CI) 5.37 (3.99, 7.22)], and displayed equivalent overall survival compared to initial surgery [Odds ratio (95% CI) 0.87(0.61, 1.25)].
REVIEWER'S CONCLUSIONS: Universal initial treatment with either surgery or thrombolysis cannot be advocated on the available evidence. There is no overall difference in limb salvage or death at one year between initial surgery and initial thrombolysis. Thrombolysis may be associated with a higher risk of ongoing limb ischaemia, and of haemorrhagic complications, including stroke. The higher risk of complications must be balanced against risks of surgery in each patient.

PMID 12137657
Berridge DC, Kessel DO, Robertson I.
Surgery versus thrombolysis for initial management of acute limb ischaemia.
Cochrane Database Syst Rev. 2013 Jun 6;(6):CD002784. doi: 10.1002/14651858.CD002784.pub2. Epub 2013 Jun 6.
Abstract/Text BACKGROUND: Peripheral arterial thrombolysis is technique used in the management of peripheral arterial ischaemia. Much is known about the indications, risks and benefits of thrombolysis. However, it is not known whether thrombolysis works better than surgery in the initial treatment of acute limb ischaemia.
OBJECTIVES: To determine the preferred initial treatment, surgery or thrombolysis, for acute limb ischaemia.
SEARCH METHODS: For this update the Cochrane Peripheral Vascular Diseases Group Trials Search Co-ordinator searched the Specialised Register (last searched March 2013) and CENTRAL (2013, Issue 2).
SELECTION CRITERIA: All randomised studies comparing thrombolysis and surgery for the initial treatment of acute limb ischaemia.
DATA COLLECTION AND ANALYSIS: Each author independently assessed trial quality and extracted data. Agreement was reached by consensus.
MAIN RESULTS: Five trials with a total of 1283 participants were included. There was no significant difference in limb salvage or death at 30 days, six months or one year between initial surgery and initial thrombolysis. However, stroke was significantly more frequent at 30 days in thrombolysis participants (1.3%) compared to surgery participants (0%) (Odds ratio (OR) 6.41; 95% confidence interval (CI) 1.57 to 26.22). Major haemorrhage was more likely at 30 days in thrombolysis participants (8.8%) compared to surgery participants (3.3%) (OR 2.80; 95% CI 1.70 to 4.60); and distal embolization was more likely at 30 days in thrombolysis participants (12.4%) compared to surgery participants (0%) (OR 8.35; 95% CI 4.47 to 15.58).Participants treated by initial thrombolysis underwent a less severe degree of intervention (OR 5.37; 95% CI 3.99 to 7.22) and displayed equivalent overall survival compared to initial surgery (OR 0.87; 95% CI 0.61 to 1.25).
AUTHORS' CONCLUSIONS: Universal initial treatment with either surgery or thrombolysis cannot be advocated on the available evidence. There is no overall difference in limb salvage or death at one year between initial surgery and initial thrombolysis. Thrombolysis may be associated with a higher risk of ongoing limb ischaemia and haemorrhagic complications including stroke. The higher risk of complications must be balanced against risks of surgery in each person.

PMID 23744596
宮田茂樹,山本晴子:ヘパリン起因性血小板減少症(HIT)の治療.血栓止血誌 2008;19(2) : 195-198..
薬剤監修について:
オーダー内の薬剤用量は日本医科大学付属病院 薬剤部 部長 伊勢雄也 以下、渡邉裕次、井ノ口岳洋、梅田将光および日本医科大学多摩永山病院 副薬剤部長 林太祐による疑義照会のプロセスを実施、疑義照会の対象については著者の方による再確認を実施しております。
※薬剤中分類、用法、同効薬、診療報酬は、エルゼビアが独自に作成した薬剤情報であり、 著者により作成された情報ではありません。
尚、用法は添付文書より、同効薬は、薬剤師監修のもとで作成しております。
※同効薬・小児・妊娠および授乳中の注意事項等は、海外の情報も掲載しており、日本の医療事情に適応しない場合があります。
※薬剤情報の(適外/適内/⽤量内/⽤量外/㊜)等の表記は、エルゼビアジャパン編集部によって記載日時にレセプトチェックソフトなどで確認し作成しております。ただし、これらの記載は、実際の保険適応の査定において保険適応及び保険適応外と判断されることを保証するものではありません。また、検査薬、輸液、血液製剤、全身麻酔薬、抗癌剤等の薬剤は保険適応の記載の一部を割愛させていただいています。
(詳細はこちらを参照)
著者のCOI(Conflicts of Interest)開示:
藤井泰宏 : 特に申告事項無し[2024年]
監修:伊藤浩 : 講演料(第一三共(株),大塚製薬(株))[2024年]

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