Thrombotic microangiopathy(TMA)is an uncommon but serious complication that not only affects native kidneys but also transplanted kidneys.This review is specifically focused on post-transplant TMA(PT-TMA)involving kid...Thrombotic microangiopathy(TMA)is an uncommon but serious complication that not only affects native kidneys but also transplanted kidneys.This review is specifically focused on post-transplant TMA(PT-TMA)involving kidney transplant recipients.Its reported prevalence in the latter population varies from 0.8%to 14%with adverse impacts on both graft and patient survival.It has many causes and associations,and the list of etiologic agents and associations is growing constantly.The pathogenesis is equally varied and a variety of pathogenetic pathways lead to the development of microvascular injury as the final common pathway.PT-TMA is categorized in many ways in order to facilitate its management.Ironically,more than one causes are contributory in PT-TMA and it is often difficult to pinpoint one particular cause in an individual case.Pathologically,the hallmark lesions are endothelial cell injury and intravascular thrombi affecting the microvasculature.Early diagnosis and classification of PT-TMA are imperative for optimal outcomes but are challenging for both clinicians and pathologists.The Banff classification has addressed this issue and has developed minimum diagnostic criteria for pathologic diagnosis of PT-TMA in the first phase.Management of the condition is also challenging and still largely empirical.It varies from simple maneuvers,such as plasmapheresis,drug withdrawal or modification,or dose reduction,to lifelong complement blockade,which is very expensive.A thorough understanding of the condition is imperative for an early diagnosis and quick treatment when the treatment is potentially effective.This review aims to increase the awareness of relevant stakeholders regarding this important,potentially treatable but under-recognized cause of kidney allograft dysfunction.展开更多
BACKGROUND Thrombotic microangiopathy(TMA)is a group of disorders that converge on excessive platelet aggregation in the microvasculature,leading to consumptive thrombocytopenia,microangiopathic hemolysis and ischemic...BACKGROUND Thrombotic microangiopathy(TMA)is a group of disorders that converge on excessive platelet aggregation in the microvasculature,leading to consumptive thrombocytopenia,microangiopathic hemolysis and ischemic end-organ dysfunction.In predisposed patients,TMA can be triggered by many environmental factors.Glucocorticoids(GCs)can compromise the vascular endothelium.However,GC-associated TMA has rarely been reported,which may be due to the lack of awareness of clinicians.Given the high frequency of thrombocytopenia during GC treatment,particular attention should be given to this potentially fatal complication.CASE SUMMARY An elderly Chinese man had a 12-year history of aplastic anemia(AA)and a 3-year history of paroxysmal nocturnal hemoglobinuria(PNH).Three months earlier,methylprednisolone treatment was initiated at 8 mg/d and increased to 20 mg/d to alleviate complement-mediated hemolysis.Following GC treatment,his platelet counts and hemoglobin levels rapidly decreased.After admission to our hospital,the dose of methylprednisolone was increased to 60 mg/d in an attempt to enhance the suppressive effect.However,increasing the GC dose did not alleviate hemolysis,and his cytopenia worsened.Morphological evaluation of the marrow smears revealed increased cellularity with an increased percentage of erythroid progenitors without evident dysplasia.Cluster of differentiation(CD)55 and CD59 expression was significantly decreased on erythrocytes and granulocytes.In the following days,platelet transfusion was required due to severe thrombocytopenia.Observation of platelet transfusion refractoriness indicated that the exacerbated cytopenia may have been caused by the development of TMA due to GC treatment because the transfused platelet concentrates had no defects in glycosylphosphatidylinositol-anchored proteins.We examined blood smears and found a small number of schistocytes,dacryocytes,acanthocytes and target cells.Discontinuation of GC treatment resulted in rapidly increased platelet counts and steady increases in hemoglobin levels.The patient’s platelet counts and hemoglobin levels returned to the levels prior to GC treatment 4 weeks after GC discontinuation.CONCLUSION GCs can drive TMA episodes.When thrombocytopenia occurs during GC treatment,TMA should be considered,and GCs should be discontinued.展开更多
目的:探讨蛋白酶体抑制剂(PI)相关血栓性微血管病(TMA)的发生规律和临床特点,为临床安全用药提供参考。方法:检索中国知网、万方数据库、维普数据库、PubMed、Web of Science等数据库中收录的PI相关TMA的案例报道,检索时间为建库至2023...目的:探讨蛋白酶体抑制剂(PI)相关血栓性微血管病(TMA)的发生规律和临床特点,为临床安全用药提供参考。方法:检索中国知网、万方数据库、维普数据库、PubMed、Web of Science等数据库中收录的PI相关TMA的案例报道,检索时间为建库至2023年4月30日。对患者基本信息、用药情况、TMA的临床表现、实验室检查、治疗及预后进行汇总分析。结果:纳入文献37篇,涉及患者92例,其中男性46例(占50.00%),女性29例(占31.52%),性别不详17例(占18.48%);平均年龄为(61±13)岁。TMA的中位发病时间为64 d,临床表现以发热、乏力、恶心/呕吐、少尿/无尿为主。因1例患者出现2次TMA,则合计93例次TMA,患者血小板计数明显降低,中位值为19.5×10^(9)/L,其中0~50×10^(9)/L的患者最多(52例次,占55.91%);64例次患者(占68.82%)的血清肌酐水平升高,其中>177~445μmol/L的患者最多(32例次,占34.41%)。停药和支持治疗后(共93例次),76例次患者(占81.72%)痊愈/好转,6例次(占6.45%)有后遗症,5例次(占5.38%)死亡。PI相关TMA中,主要涉及的药物为卡非佐米(67例次,占72.04%)。结论:应重视PI所致TMA,应用PI时应考虑患者性别、药物种类等因素;根据临床表现及实验室检查结果,尽早识别不良反应,保障患者用药安全。展开更多
BACKGROUND In this study,we retrospectively analysed macrophage infiltration and podocyte injury in three patients with diffuse proliferative lupus nephritis(LN)who un-derwent repeated renal biopsy.CASE SUMMARY Clinic...BACKGROUND In this study,we retrospectively analysed macrophage infiltration and podocyte injury in three patients with diffuse proliferative lupus nephritis(LN)who un-derwent repeated renal biopsy.CASE SUMMARY Clinical data of three diffuse proliferative LN patients with different pathological characteristics(case 1 was LN IV-G(A),case 2 was LN IV-G(A)+V,and case 3 was LN IV-G(A)+thrombotic microangiopathy)were reviewed.All patients underwent repeated renal biopsies 6 mo later,and renal biopsy specimens were studied.Macrophage infiltration was assessed by CD68 expression detected by immunohistochemical staining,and an immunofluorescence assay was used to detect podocin expression to assess podocyte damage.After treatment,Case 1 changed to LN III-(A),Case 2 remained as type V LN lesions,and Case 3,which changed to LN IV-S(A),had the worst prognosis.We observed reduced macro-phage infiltration after therapy.However,two of the patients with active lesions after treatment still showed macrophage infiltration in the renal interstitium.Before treatment,the three patients showed discontinuous expression of podocin.Notably,the integrity of podocin was restored after treatment in Case 1.CONCLUSION It may be possible to reverse podocyte damage and decrease the infiltrating ma-crophages in LN patients through effective treatment.展开更多
文摘Thrombotic microangiopathy(TMA)is an uncommon but serious complication that not only affects native kidneys but also transplanted kidneys.This review is specifically focused on post-transplant TMA(PT-TMA)involving kidney transplant recipients.Its reported prevalence in the latter population varies from 0.8%to 14%with adverse impacts on both graft and patient survival.It has many causes and associations,and the list of etiologic agents and associations is growing constantly.The pathogenesis is equally varied and a variety of pathogenetic pathways lead to the development of microvascular injury as the final common pathway.PT-TMA is categorized in many ways in order to facilitate its management.Ironically,more than one causes are contributory in PT-TMA and it is often difficult to pinpoint one particular cause in an individual case.Pathologically,the hallmark lesions are endothelial cell injury and intravascular thrombi affecting the microvasculature.Early diagnosis and classification of PT-TMA are imperative for optimal outcomes but are challenging for both clinicians and pathologists.The Banff classification has addressed this issue and has developed minimum diagnostic criteria for pathologic diagnosis of PT-TMA in the first phase.Management of the condition is also challenging and still largely empirical.It varies from simple maneuvers,such as plasmapheresis,drug withdrawal or modification,or dose reduction,to lifelong complement blockade,which is very expensive.A thorough understanding of the condition is imperative for an early diagnosis and quick treatment when the treatment is potentially effective.This review aims to increase the awareness of relevant stakeholders regarding this important,potentially treatable but under-recognized cause of kidney allograft dysfunction.
基金Supported by Specialized Scientific Research Fund Projects of The Medical Group of Qingdao University,No.YLJT20201002.
文摘BACKGROUND Thrombotic microangiopathy(TMA)is a group of disorders that converge on excessive platelet aggregation in the microvasculature,leading to consumptive thrombocytopenia,microangiopathic hemolysis and ischemic end-organ dysfunction.In predisposed patients,TMA can be triggered by many environmental factors.Glucocorticoids(GCs)can compromise the vascular endothelium.However,GC-associated TMA has rarely been reported,which may be due to the lack of awareness of clinicians.Given the high frequency of thrombocytopenia during GC treatment,particular attention should be given to this potentially fatal complication.CASE SUMMARY An elderly Chinese man had a 12-year history of aplastic anemia(AA)and a 3-year history of paroxysmal nocturnal hemoglobinuria(PNH).Three months earlier,methylprednisolone treatment was initiated at 8 mg/d and increased to 20 mg/d to alleviate complement-mediated hemolysis.Following GC treatment,his platelet counts and hemoglobin levels rapidly decreased.After admission to our hospital,the dose of methylprednisolone was increased to 60 mg/d in an attempt to enhance the suppressive effect.However,increasing the GC dose did not alleviate hemolysis,and his cytopenia worsened.Morphological evaluation of the marrow smears revealed increased cellularity with an increased percentage of erythroid progenitors without evident dysplasia.Cluster of differentiation(CD)55 and CD59 expression was significantly decreased on erythrocytes and granulocytes.In the following days,platelet transfusion was required due to severe thrombocytopenia.Observation of platelet transfusion refractoriness indicated that the exacerbated cytopenia may have been caused by the development of TMA due to GC treatment because the transfused platelet concentrates had no defects in glycosylphosphatidylinositol-anchored proteins.We examined blood smears and found a small number of schistocytes,dacryocytes,acanthocytes and target cells.Discontinuation of GC treatment resulted in rapidly increased platelet counts and steady increases in hemoglobin levels.The patient’s platelet counts and hemoglobin levels returned to the levels prior to GC treatment 4 weeks after GC discontinuation.CONCLUSION GCs can drive TMA episodes.When thrombocytopenia occurs during GC treatment,TMA should be considered,and GCs should be discontinued.
文摘目的:探讨蛋白酶体抑制剂(PI)相关血栓性微血管病(TMA)的发生规律和临床特点,为临床安全用药提供参考。方法:检索中国知网、万方数据库、维普数据库、PubMed、Web of Science等数据库中收录的PI相关TMA的案例报道,检索时间为建库至2023年4月30日。对患者基本信息、用药情况、TMA的临床表现、实验室检查、治疗及预后进行汇总分析。结果:纳入文献37篇,涉及患者92例,其中男性46例(占50.00%),女性29例(占31.52%),性别不详17例(占18.48%);平均年龄为(61±13)岁。TMA的中位发病时间为64 d,临床表现以发热、乏力、恶心/呕吐、少尿/无尿为主。因1例患者出现2次TMA,则合计93例次TMA,患者血小板计数明显降低,中位值为19.5×10^(9)/L,其中0~50×10^(9)/L的患者最多(52例次,占55.91%);64例次患者(占68.82%)的血清肌酐水平升高,其中>177~445μmol/L的患者最多(32例次,占34.41%)。停药和支持治疗后(共93例次),76例次患者(占81.72%)痊愈/好转,6例次(占6.45%)有后遗症,5例次(占5.38%)死亡。PI相关TMA中,主要涉及的药物为卡非佐米(67例次,占72.04%)。结论:应重视PI所致TMA,应用PI时应考虑患者性别、药物种类等因素;根据临床表现及实验室检查结果,尽早识别不良反应,保障患者用药安全。
基金Supported by National Natural Science Foundation of China,No.81960136the Science and Technology Department of Yunnan Province,No.202101AT070243.
文摘BACKGROUND In this study,we retrospectively analysed macrophage infiltration and podocyte injury in three patients with diffuse proliferative lupus nephritis(LN)who un-derwent repeated renal biopsy.CASE SUMMARY Clinical data of three diffuse proliferative LN patients with different pathological characteristics(case 1 was LN IV-G(A),case 2 was LN IV-G(A)+V,and case 3 was LN IV-G(A)+thrombotic microangiopathy)were reviewed.All patients underwent repeated renal biopsies 6 mo later,and renal biopsy specimens were studied.Macrophage infiltration was assessed by CD68 expression detected by immunohistochemical staining,and an immunofluorescence assay was used to detect podocin expression to assess podocyte damage.After treatment,Case 1 changed to LN III-(A),Case 2 remained as type V LN lesions,and Case 3,which changed to LN IV-S(A),had the worst prognosis.We observed reduced macro-phage infiltration after therapy.However,two of the patients with active lesions after treatment still showed macrophage infiltration in the renal interstitium.Before treatment,the three patients showed discontinuous expression of podocin.Notably,the integrity of podocin was restored after treatment in Case 1.CONCLUSION It may be possible to reverse podocyte damage and decrease the infiltrating ma-crophages in LN patients through effective treatment.
