Matas A J
Department of Surgery, University of Minnesota, Minneapolis, Minnesota 55455, USA.
Transplant Proc. 2008 Dec;40(10 Suppl):S52-6. doi: 10.1016/j.transproceed.2008.10.007.
Steroids have numerous side effects, many occurring early posttransplantation with relatively low prednisone doses. Consequently, investigators have attempted steroid minimization or withdrawal. The first attempts at steroid minimization used early low-dose steroids and were associated with an increased rate of acute rejection episodes, late graft dysfunction, and graft loss. Subsequent studies, with cyclosporine-based immunosuppression, attempted steroid withdrawal late posttransplantation (>3 months) in highly selected, clinically well, and immunologically low-risk recipients. Again, steroid withdrawal was associated with an increased risk of acute rejection episodes and these episodes were associated with graft dysfunction and increased graft loss. The development of new powerful immunosuppressive agents has led to renewed attempts at late prednisone withdrawal. These also have been associated with increased late rejection risk. A more exciting innovation has been the attempts at rapid discontinuation (<or=7 days posttransplantation) of prednisone with the following results: (1) Randomized studies have shown no significantly increased risk of acute rejection; (2) Randomized and nonrandomized studies have shown no increase in late graft loss; (3) Successful use in living and deceased donor recipients, primary and re-transplant recipients, adult and child recipients, white and black recipients, and low-risk and highly sensitized recipients; (4) About 80% of recipients remain prednisone-free long term. Recent nonrandomized data suggest that recipients who have an acute rejection episode while prednisone free are more likely to have a second rejection episode if they are returned to prednisone-free immunosuppression. In these cases the acute rejection episode should be treated and long-term prednisone continued at 5 mg/d.
类固醇有众多副作用,许多在移植后早期出现,且泼尼松剂量相对较低。因此,研究人员尝试减少或停用类固醇。最初减少类固醇使用的尝试采用早期低剂量类固醇,结果急性排斥反应发生率增加、移植后期功能障碍及移植失败。随后的研究,采用以环孢素为基础的免疫抑制方案,尝试在移植后期(>3个月)对高度选择的、临床状况良好且免疫风险低的受者停用类固醇。同样,停用类固醇与急性排斥反应风险增加相关,且这些反应与移植功能障碍及移植失败增加有关。新型强效免疫抑制剂的研发促使人们再次尝试在后期停用泼尼松。这些尝试也与后期排斥反应风险增加相关。一项更令人兴奋的创新是尝试在移植后快速停用(≤7天)泼尼松,结果如下:(1)随机研究表明急性排斥反应风险无显著增加;(2)随机和非随机研究表明移植后期失败无增加;(3)成功应用于活体和尸体供者受者、初次和再次移植受者、成人和儿童受者、白种人和黑种人受者以及低风险和高敏受者;(4)约80%的受者长期无需使用泼尼松。最近的非随机数据表明,在未使用泼尼松时发生急性排斥反应的受者,如果重新采用无泼尼松的免疫抑制方案,更有可能再次发生排斥反应。在这些情况下,应治疗急性排斥反应,并继续长期使用泼尼松,剂量为5毫克/天。