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儿童过敏性紫癜.ppt

  • 2026-03-31 07:04:25
儿童过敏性紫癜.ppt

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先看看我写的学习笔记,PPT往下翻

一、疾病概述

  1. 基本定义与别称:曾称亨 - 舒综合征(HSP),最新血管炎分类基于病理机制更名为 IgA 血管炎(IgAV),本质是全身小血管炎为核心病变的系统性血管炎,以 “血小板不减少性紫癜” 为典型标志,常伴关节肿痛、腹痛、便血、血尿或蛋白尿。

  2. 发病人群与季节:多发于 2~8 岁儿童,男孩患病数多于女孩;四季均可发病,春秋两季为高发期。

二、病因与发病机制

  1. 病因(尚未明确,可能相关因素)

    • 食物:蛋类、乳类、豆类等,可能作为过敏原诱发个体免疫反应。

    • 药物:阿司匹林、抗生素等,药物致敏或不良反应可能参与发病。

    • 微生物:细菌(重点是 A 组溶血性链球菌,50% 患儿有相关呼吸道感染史,30% 紫癜性肾炎患儿肾小球有其抗原沉积)、病毒、寄生虫等。

    • 其他:疫苗接种、麻醉、恶性病变等,临床关联性证据较少。

  2. 发病机制

    • 免疫核心:B 淋巴细胞多克隆活化,T 细胞 / 单核细胞 CD40L 过度表达→大量 IgA(以 IgA1 为主)生成→IgA 免疫复合物沉积于血管壁(皮肤、肾脏、肠道等),引发炎症。

    • 遗传倾向:家族中同胞可先后发病;HLA-DRB1*07、HLA-DW35 基因高表达者易感;补体 C2 缺乏者发病率升高。

    • 总体逻辑:诱因(感染 / 过敏)作用于遗传易感个体→IgA 介导系统性小血管炎。

三、病理特征

  1. 基本病变:广泛白细胞碎裂性小血管炎,以毛细血管受累为主,可波及小静脉、小动脉。

  2. 血管壁改变:胶原纤维肿胀坏死,中性粒细胞浸润(伴核碎片),间质水肿(有浆液 / 红细胞渗出),内皮细胞肿胀(可形成血栓)。

  3. 主要累及部位:皮肤、肾脏、关节、胃肠道,少数波及心、肺。

  4. 免疫荧光与肾脏病理:皮肤 / 肾脏活检可见 IgA 为主的免疫复合物沉积;肾脏病变轻重不一,轻者为系膜增生、微小病变,重者呈弥漫增殖性肾炎伴新月体形成(需与 IgA 肾病鉴别:后者无皮疹及皮肤血管炎,仅肾小球有 IgA 沉积)。

四、临床表现

  1. 起病特点:急性起病,多以皮肤紫癜为首发症状(少数先出现腹痛、关节炎或肾脏症状);起病前 1~3 周常有上呼吸道感染史,伴低热、乏力、食欲减退。

  2. 各系统症状

    • 皮肤紫癜(标志性):四肢、臀部对称分布(伸侧多),分批出现;形态从紫红色斑丘疹(高出皮面、压不褪色)→暗紫→棕褐,2~4 周消退,可复发数年;少数重症融合成大疱伴坏死,部分伴荨麻疹 / 血管性水肿。

    • 胃肠道症状(2/3 患儿):阵发性腹痛(脐周 / 下腹为主),伴呕吐,黑便或鲜血便;并发症为肠套叠、肠梗阻、肠穿孔(需外科干预)。

    • 关节症状(1/3 患儿):膝、踝、肘、腕等大关节肿痛,活动受限;关节腔有浆液性积液(无出血),数日内缓解,不留后遗症。

    • 肾脏症状(30%~60% 患儿):起病 1 个月内多见(少数为首发 / 迟发);表现为血尿、蛋白尿、管型尿(称紫癜性肾炎),少数呈肾病综合征;多数可恢复,少数迁延数月至数年,极少数发展为慢性肾衰。

    • 其他:偶发颅内出血(致惊厥、昏迷)、鼻出血、心肌炎、喉头水肿等(提示病情较重)。

五、辅助检查

  1. 常规检查:血常规(白细胞正常 / 升高,血小板正常 / 升高,无贫血,毛细血管脆性试验可阳性);尿常规(红细胞、蛋白、管型,重症见肉眼血尿);大便潜血(消化道出血时阳性)。

  2. 生化免疫:血沉轻度增快,血清 IgA 升高(IgG、IgM 正常 / 轻度升高),C3、C4 正常 / 升高,抗核抗体、类风湿因子阴性;重症血浆黏度增高。

  3. 影像与病理检查:腹部超声(查肠壁水肿、排除肠套叠);腹 X 线(协助诊断肠梗阻 / 穿孔);头颅 MRI(中枢症状患儿);肾穿刺活检(肾脏症状重 / 迁延者,明确病理类型指导治疗)。

六、诊断与鉴别诊断

  1. 诊断标准(欧洲儿科血管炎 2006 标准):典型皮肤紫癜(血小板不减少)+ 以下任一项:弥漫性腹痛、关节炎 / 关节痛、组织活检 IgA 沉积、肾损害(血尿 / 蛋白尿)。

  2. 鉴别诊断

    • 免疫性血小板减少性紫癜:血小板显著减少,无血管炎表现,骨髓检查可鉴别。

    • 风湿性关节炎:伴发热、心脏受累,关节症状久且留畸形,抗 “O” 升高。

    • 败血症:有高热、寒战等感染中毒症状,血培养阳性,抗生素有效。

    • 外科急腹症(如阑尾炎):腹痛固定(右下腹),有压痛反跳痛,无皮疹。

    • 其他肾病(如急性肾炎):无紫癜、腹痛,免疫荧光无 IgA 为主沉积。

七、治疗原则与方案

  1. 一般治疗:皮疹明显时卧床休息;祛除诱因(控制感染、避过敏原);对症处理(抗组胺药 + 钙剂治荨麻疹,解痉剂治腹痛,禁食 + 西咪替丁治消化道出血,贫血时输血)。

  2. 糖皮质激素与免疫抑制剂

    • 激素:缓解急性期腹痛、关节痛,不能预防肾损害;适应证为消化道出血、严重血管性水肿、重症关节炎;常用泼尼松(1~2mg/kg/ 日口服)或甲泼尼龙(2~10mg/kg/ 日静滴),症状缓解后停用。

    • 免疫抑制剂:仅用于重症紫癜性肾炎(如大量蛋白尿、肾衰),在激素基础上加用环磷酰胺、吗替麦考酚酯等,监测肝肾功能及骨髓抑制。

  3. 抗凝治疗:阿司匹林(3~5mg/kg/ 日)或双嘧达莫(3~5mg/kg/ 日)抗血小板聚集;高凝状态时用低分子肝素(0.5~1mg/kg/ 次,每日 1 次,共 7 天),监测凝血功能。

  4. 其他:钙通道拮抗剂(硝苯地平)降肾性高血压;ACEI 类药减少蛋白尿;萘普生缓解关节痛;重症可血液净化;中成药(黄芪颗粒、复方丹参片)辅助补肾活血。

八、预后

  1. 总体预后:良好,多数患儿完全恢复。

  2. 不良结局:少数死于肠出血、肠套叠或颅内出血;病程多为 1~3 个月,少数迁延数月至 1 年以上。

  3. 远期关键:取决于肾脏受累程度,少数肾脏病变迁延者发展为慢性肾脏病或慢性肾衰,需长期门诊随访。

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  1. CONNECT:[ UseTime:0.011524s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.004118s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000512s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000504s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000986s ]
  6. SELECT * FROM `set` [ RunTime:0.000460s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001117s ]
  8. SELECT * FROM `article` WHERE `id` = 464825 LIMIT 1 [ RunTime:0.010255s ]
  9. UPDATE `article` SET `lasttime` = 1775656471 WHERE `id` = 464825 [ RunTime:0.017725s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000580s ]
  11. SELECT * FROM `article` WHERE `id` < 464825 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000880s ]
  12. SELECT * FROM `article` WHERE `id` > 464825 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000839s ]
  13. SELECT * FROM `article` WHERE `id` < 464825 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001800s ]
  14. SELECT * FROM `article` WHERE `id` < 464825 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003210s ]
  15. SELECT * FROM `article` WHERE `id` < 464825 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002808s ]
0.727918s