当前位置:首页>PPT>【713】结、直肠与肛管疾病(痔).ppt

【713】结、直肠与肛管疾病(痔).ppt

  • 2026-03-30 10:59:09
【713】结、直肠与肛管疾病(痔).ppt

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先看看我写的学习笔记,PPT往下翻。

一、概述

  1. 分型与定义:内痔位于齿状线以上,由肛垫的支持结构、静脉丛、动静脉吻合充血、增生、肥大、移位形成;外痔位于齿状线以下,是皮下静脉丛病理性扩张或结缔组织增生导致;混合痔为内痔与相应部位外痔通过静脉丛相互融合而成。
  2. 地位:最常见的肛肠疾病,婴幼儿罕见,发病率随年龄增长而升高。
  3. 肛垫生理:由黏膜下血管、平滑肌、结缔组织组成,借 Treitz 肌固定于肛管肌壁,功能是闭合肛管、节制排便,排便时受压下移,便后弹性回缩。

二、病因

  1. 肛垫下移学说(主流):肛垫弹性回缩能力减弱,引发充血、下移、增生肥大,最终形成痔。
  2. 静脉曲张学说:门静脉系统无静脉瓣,直肠上下静脉丛壁薄、位置浅且处于最低位,黏膜下组织松弛,易淤血扩张;长期坐立、便秘、腹泻、妊娠等可诱发回流受阻。
  3. 其他诱发因素:长期饮酒、大量刺激性饮食导致局部充血;肛周感染引发静脉周围炎,使静脉失去弹性;营养不良导致组织萎缩无力。

三、分类和临床表现

(一)内痔

  1. 好发部位:截石位 3、7、11 点。
  2. 典型症状:间歇性便后出血,无疼痛(无血栓、嵌顿、感染时),可伴排便困难,核心表现为出血、脱出。
  3. 分度:1 度(便时带血、滴血,便后自止,无脱出);2 度(排便时脱出,便后自行还纳,可伴出血);3 度(排便、久站、咳嗽等时脱出,需用手还纳,可伴出血);4 度(脱出不能还纳或还纳即脱出,可伴出血)。

(二)外痔

  1. 平常表现:肛缘皮赘或小肿物,肛门不适、潮湿不洁、瘙痒。
  2. 急性发作:血栓形成(血栓性外痔),突出表现为肛门剧痛。

(三)混合痔

  1. 症状:同时具备内痔与外痔症状,多由 Ⅲ 度以上内痔发展而来。
  2. 特殊类型:环状痔(混合痔加重呈环状脱出,痔块呈梅花状或环状);嵌顿痔(脱出痔块被括约肌嵌顿,无法还纳,继之水肿、淤血、坏死,属急症)。

四、诊断

  1. 肛门视诊:观察痔块大小、数目、部位、黏膜糜烂,脱垂者蹲位排便后检查最清晰。
  2. 直肠指诊:主要目的是排除直肠癌、直肠息肉等病变,内痔无血栓、纤维化时不易触及。
  3. 肛门镜检查:直接观察痔核黏膜情况,查看直肠黏膜有无充血、水肿、溃疡。
  4. 血栓性外痔特征:肛周暗紫色卵圆形肿物,质硬、触痛明显。

鉴别诊断

  1. 直肠癌:最易误诊、最危险,指诊可扪及高低不平硬块,指套常染暗红色血,需做指诊 + 肠镜避免误诊。
  2. 直肠息肉:圆形、实质性、有蒂、可活动,多见于儿童,易被误当痔脱出。
  3. 肥大肛乳头:来源于齿状线区域,多为有蒂肿块。
  4. 直肠脱垂:黏膜皱襞呈同心圆排列,多伴肛门括约肌松弛。

五、治疗

治疗总原则

无症状痔无需治疗;有症状痔重在减轻 / 消除症状,而非根治;以非手术治疗为主。

(一)一般治疗

  1. 适用:痔初期、无症状痔、血栓性外痔、嵌顿痔初期。
  2. 措施:增加膳食纤维,保持大便通畅;改变不良排便习惯,防便秘、腹泻;热水坐浴改善局部血液循环。
  3. 特殊处理:血栓性外痔局部热敷 + 外敷消肿止痛药;嵌顿痔初期手法复位 + 纱布固定防再脱出。

(二)注射治疗

  1. 适用:I、Ⅱ 度出血性内痔,效果好。
  2. 原理:注射硬化剂引发无菌性炎症,使黏膜下纤维化,痔块萎缩。
  3. 常用硬化剂:5% 苯酚植物油、5% 鱼肝油酸钠、合格中药硬化制剂,禁用腐蚀性药物。
  4. 操作要点:局麻后肛门镜暴露痔核,注入黏膜下层 2~3ml,禁注黏膜层(防坏死)。
  5. 疗程:效果不佳 1 个月后重复,痔多者分 2~3 次注射。

(三)胶圈套扎疗法

  1. 适用:I、Ⅱ、Ⅲ 度内痔。
  2. 原理:胶圈套扎痔根部,阻断血运,使痔慢性缺血、坏死、脱落愈合。
  3. 器械:牵拉套扎器、吸引套扎器或两把血管钳替代。
  4. 注意:严禁套在齿状线及皮肤上(会剧痛);术后痔脱落期可能出血,需管理大便。

(四)多普勒超声引导下痔动脉结扎术

  1. 适用:Ⅱ~Ⅳ 度内痔。
  2. 原理:多普勒探头定位痔动脉,缝合结扎后阻断血运,使痔萎缩。
  3. 部位:齿状线上方 2~3cm。

(五)手术疗法

  1. 痔切除术:适用 Ⅱ~Ⅳ 度内痔、混合痔、嵌顿痔;要点是痔块基底部做 V 形切口,分离静脉团至显露内括约肌,基底缝扎后切除痔核,齿状线以上黏膜缝合、以下皮肤不缝合。
  2. 吻合器痔上黏膜环切钉合术(PPH):适用 Ⅲ、Ⅳ 度内痔、环状痔、直肠黏膜内脱垂;原理是环形切除齿状线上 2cm 以上黏膜及黏膜下层 2~4cm,肛垫上提固定;优点是疼痛轻、时间短、恢复快。
  3. 选择性痔上黏膜切除钉合术(TST):适用 Ⅲ、Ⅳ 度内痔;原理同 PPH,但选择性切除黏膜;优点是保护正常直肠壁,减少并发症,对功能影响小。
  4. 血栓外痔剥离术:适用血栓性外痔;方法是局麻下梭形切开皮肤,摘除血栓,创面不缝合。

治疗总结

大多数痔首选注射疗法、胶圈套扎;手术仅用于非手术失败或重度痔。

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  1. CONNECT:[ UseTime:0.000451s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000630s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000337s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000368s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000649s ]
  6. SELECT * FROM `set` [ RunTime:0.000285s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000713s ]
  8. SELECT * FROM `article` WHERE `id` = 484272 LIMIT 1 [ RunTime:0.010095s ]
  9. UPDATE `article` SET `lasttime` = 1775486115 WHERE `id` = 484272 [ RunTime:0.002619s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000342s ]
  11. SELECT * FROM `article` WHERE `id` < 484272 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003325s ]
  12. SELECT * FROM `article` WHERE `id` > 484272 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002784s ]
  13. SELECT * FROM `article` WHERE `id` < 484272 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.017921s ]
  14. SELECT * FROM `article` WHERE `id` < 484272 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.013251s ]
  15. SELECT * FROM `article` WHERE `id` < 484272 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.027126s ]
0.251216s