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【73】结核菌素皮肤试验.ppt

  • 2026-04-29 17:07:20
【73】结核菌素皮肤试验.ppt

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先看看我写的学习笔记,PPT往下翻。

一、概述

  1. 定义:以结核菌素纯蛋白衍生物(PPD)为抗原,判断是否感染结核分枝杆菌的重要手段。
  2. 抗原发展:我国既往用旧结核菌素(OT),为方便国际结核感染率比较,现推荐使用 PPD。

二、适应证

  1. 胸部影像学检查异常的病人。
  2. 涂片阳性肺结核病人的亲密接触者。
  3. 涂片阴性病人及需与其他疾病鉴别诊断的病人。

三、试验方法

  1. 注射操作:取 0.1ml(5U)结核菌素纯蛋白衍生物,在左或右前臂内侧进行皮内注射。
  2. 结果测量:皮试后 48~72 小时,测量并记录皮试处周围皮肤红晕、硬结的反应面积。
  3. 结果判断标准
    • 阴性(-):硬结平均直径<5mm 或无反应。
    • 一般阳性(+):5mm≤硬结平均直径<10mm。
    • 中度阳性(++):10mm≤硬结平均直径<15mm。
    • 强阳性(+++):硬结平均直径≥15mm,或局部出现双圈、水疱、坏死及淋巴管炎。
  4. 结果临床意义
    • 阴性意义:常见于未曾感染结核菌者;处于结核感染早期(4~8 周)者;血行播散型肺结核等重症结核病人;使用免疫抑制剂或糖皮质激素者;HIV(+)、恶性肿瘤及结节病患者;老年人或营养不良者等。
    • 阳性意义:通常提示存在结核分枝杆菌感染。需注意,我国儿童普遍接种卡介苗,儿童 PPD 阳性对诊断结核病意义不大;未接种卡介苗的儿童若 PPD 阳性,提示已感染结核分枝杆菌或有活动性结核病变,需按活动性结核病处理;成人强阳性表明机体处于超敏状态,需考虑活动性结核病可能,可作为结核病诊断的参考指标。

四、注意事项

  1. 皮试前若病人前臂内侧皮肤有损伤,需重新安排皮试时间。
  2. 老年人对 PPD 反应较年轻人慢,可能需在 72 小时以后才能观察到反应结果。
  3. 0.4%~20% 的活动性肺结核病人可能呈假阴性,此类病人在初次注射 1~3 周后重复试验,可能因助强效应呈强阳性反应。
  4. PPD 含多种抗原成分,多数与其他分枝杆菌存在交叉反应,故其特异性较差,难以区分与其他分枝杆菌感染,也无法辨别是自然感染还是卡介苗接种后的反应。

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          1. CONNECT:[ UseTime:0.000615s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
          2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000737s ]
          3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000309s ]
          4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000258s ]
          5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000525s ]
          6. SELECT * FROM `set` [ RunTime:0.000280s ]
          7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001073s ]
          8. SELECT * FROM `article` WHERE `id` = 498099 LIMIT 1 [ RunTime:0.000438s ]
          9. UPDATE `article` SET `lasttime` = 1778117165 WHERE `id` = 498099 [ RunTime:0.007173s ]
          10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000393s ]
          11. SELECT * FROM `article` WHERE `id` < 498099 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000539s ]
          12. SELECT * FROM `article` WHERE `id` > 498099 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000845s ]
          13. SELECT * FROM `article` WHERE `id` < 498099 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000845s ]
          14. SELECT * FROM `article` WHERE `id` < 498099 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001505s ]
          15. SELECT * FROM `article` WHERE `id` < 498099 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000829s ]
          0.086503s