How do high‑intensity, moderate‑intensity, and low‑intensity statins differ, and what are the differences in their effects?

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Last updated: September 26, 2026 • View editorial policy

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Statin強度分類與效果差異

根據2018 AHA/ACC指引,高強度statin可降低LDL-C ≥50%、中強度降低30-49%、低強度降低<30%,且對於已有動脈粥狀硬化心血管疾病(ASCVD)的患者,應優先使用高強度statin以達到最佳的死亡率與心血管事件降低效果。 1

Statin強度的定義與分類

根據美國心臟學會/美國心臟病學會指引,statin強度分為三個等級 1, 2:

高強度Statin(降低LDL-C ≥50%)

  • Atorvastatin 40-80 mg
  • Rosuvastatin 20-40 mg

中強度Statin(降低LDL-C 30-49%)

  • Atorvastatin 10-20 mg
  • Rosuvastatin 5-10 mg
  • Simvastatin 20-40 mg
  • Pravastatin 40-80 mg
  • Lovastatin 40 mg
  • Fluvastatin 40-80 mg
  • Pitavastatin 2-4 mg

低強度Statin(降低LDL-C <30%)

  • Simvastatin 10 mg
  • Pravastatin 10-20 mg
  • Lovastatin 20 mg
  • Fluvastatin 20-40 mg

重要提醒: 實際臨床上LDL-C降低幅度會因個體差異而有所不同,某些亞洲族群對特定statin的反應可能更強 1, 2。

臨床效果差異

次級預防(已有ASCVD患者)

對於75歲以下且已有ASCVD的患者,指引明確建議應使用高強度statin,目標是達到LDL-C降低≥50% 1。這項建議基於以下證據:

  • 死亡率降低呈劑量依賴性: 2017年大型退伍軍人研究(509,766名ASCVD患者)顯示,1年死亡率在高強度statin組為4.0%,中強度為4.8%,低強度為5.7%,未使用statin為6.6%(p<0.001)。調整後,高強度相較中強度的死亡風險降低9%(HR 0.91,95% CI 0.88-0.93)3

  • 心血管事件降低: 2025年芬蘭全國性研究(45,512名缺血性中風患者)追蹤中位數5.9年,發現高強度相較中強度可降低死亡風險8%(adj.HR 0.92,95% CI 0.87-0.97, NNT=32),且呈現劑量依賴性降低復發性中風和心血管死亡(p<0.0001)4

  • 最大劑量效果更佳: 使用最大劑量高強度statin(如atorvastatin 80mg)相較次最大劑量,死亡率進一步降低10%(HR 0.90,95% CI 0.87-0.94)3

特殊族群考量

年長者(≥75歲): 指引建議在評估ASCVD風險降低潛力、副作用、藥物交互作用、衰弱程度及患者偏好後,可合理使用中強度或高強度statin 2。2017年研究顯示,即使在76-84歲患者中,高強度statin仍有生存優勢(HR 0.91,95% CI 0.87-0.95)3

腦出血後患者: 這是一個特殊情況。2025年真實世界研究(8,925對配對患者)顯示,腦出血後使用中強度statin相較高強度,反而有較低的復發性腦出血(23.4% vs 24.9%, HR 0.91)、缺血性中風(7.1% vs 10.2%, HR 0.68)和死亡率(9.0% vs 10.2%, HR 0.87)5。因此,對於非創傷性腦出血後患者,應優先考慮中強度statin。

臨床應用演算法

對於已有ASCVD的患者(次級預防):

  1. 首選: 75歲以下患者使用高強度statin(atorvastatin 40-80mg或rosuvastatin 20-40mg)1

  2. 若無法耐受高強度或有禁忌症: 改用中強度statin,目標降低LDL-C 30-49% 1

  3. 極高風險患者(LDL-C ≥70 mg/dL): 在最大耐受劑量statin基礎上,合理加上ezetimibe 2

  4. 特殊情況:

    • 非創傷性腦出血後:優先使用中強度statin 5
    • 75歲以上:評估後可使用中或高強度,若已耐受高強度可繼續使用 2

常見陷阱與注意事項

  • Simvastatin 80mg禁用: FDA因肌病變和橫紋肌溶解風險,不建議起始或調升至此劑量 2

  • 亞洲族群反應: 某些亞洲人對特定statin反應較強,可能需要調整劑量 1

  • 藥物交互作用: 需注意常見交互作用藥物,可參考ACC LDL-C Manager 2

  • 腦出血風險: 長期追蹤研究顯示,statin強度與腦出血發生率無關(p=0.646),不應因擔心腦出血而避免使用高強度statin 4

  • 副作用監測: 橫紋肌溶解和肝損傷發生率低(<0.5%),且不因statin強度而有顯著差異 5

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This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.