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【622】小肠疾病.ppt

  • 2026-04-07 03:33:58
【622】小肠疾病.ppt

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先看看我写的学习笔记,PPT往下翻。

第一部分 小肠解剖生理概要

一、小肠解剖

  1. 整体划分:上接胃幽门,下至回盲瓣,由十二指肠、空肠、回肠组成,全长 3~6m;空肠为系膜小肠近端 2/5,回肠为远端 3/5,二者无明确解剖界限。
  2. 各段特征:十二指肠长 20~25cm,管腔最粗、位置最固定,与空肠交界处由 Treitz 韧带固定;空肠肠腔粗、壁厚,黏膜环状皱襞高而密;回肠肠腔细、壁薄,黏膜环状皱襞渐低稀且远端消失。
  3. 血管供应:十二指肠近端由腹腔干分支供血,其余小肠由肠系膜上动脉供血,其分支吻合形成动脉弓,直动脉至肠壁且无吻合;近端小肠动脉弓级数少、直支长,远端则相反;静脉与动脉伴行,汇合成肠系膜上静脉后与脾静脉汇合形成门静脉。
  4. 淋巴引流:路径为肠黏膜乳糜管→肠周淋巴结→系膜血管弓区域淋巴结→肠系膜上动静脉周围淋巴结→乳糜池;空肠有孤立淋巴小结,回肠含大量 Peyer 集结;功能为转运脂质、免疫防御。
  5. 神经支配:受自主神经支配,形成腹腔及肠系膜上神经丛;交感神经使蠕动减弱、血管收缩等,迷走神经作用相反;痛觉经交感神经传入,放射至脐周,极少至腰背部。

二、小肠生理功能

  1. 消化与吸收:分泌碱性肠液,肠激酶为核心酶,分解食糜为小分子物质;吸收营养物质、水、电解质及维生素;每日 6~8L 消化液 80% 在小肠重吸收,疾病易致水电解质紊乱和营养障碍。
  2. 内分泌功能:分泌促胰液素、生长抑素等多种胃肠激素,通过多种方式调节消化腺分泌、肠上皮营养及肠道运动。
  3. 屏障功能:由 IgA、黏蛋白等组成,阻止病原体和毒素移位;肠壁缺血或炎症时屏障功能破坏,易引发感染。

第二部分 肠感染性疾病

一、肠结核

  1. 基础概况:结核分枝杆菌引起的慢性特异性感染,外科仅处理肠狭窄、穿孔等并发症;分原发性(少见,儿童为主)和继发性(多见,肺结核为主要原发病)。
  2. 病因病理:好发回盲部 + 末端回肠;溃疡型多见,溃疡环形与肠腔长轴垂直,后期瘢痕致狭窄;增生型少见,肠壁增厚变硬,易引发肠梗阻,两型可并存。
  3. 临床表现:全身有低热、盗汗等结核中毒症状;溃疡型以右下腹 / 脐周隐痛、腹泻或交替便秘为主要表现;增生型及环形狭窄溃疡型以低位不完全性肠梗阻为核心,右下腹可触及肿块;并发症有肠穿孔(形成局限性脓肿)、肠瘘。
  4. 诊断鉴别:依据结核病史、全身及腹部症状,结合实验室(血沉加快等)、影像学(CT 见肠壁增厚,X 线钡剂造影见跳跃征)及内镜 + 病理检查(确诊关键);重点与克罗恩病、回盲部恶性肿瘤鉴别。
  5. 治疗原则:内科为主,术前常规抗结核 + 营养支持,病情稳定后手术;手术适应证为肠梗阻、穿孔、大出血、疑肿瘤等;术式依病情选肠段切除吻合、回盲部切除等,急性穿孔禁用局部修补。

二、肠伤寒穿孔

  1. 基础概况:伤寒的严重并发症,病死率高,由伤寒杆菌引起,病变为回肠末端溃疡致急性穿孔、弥漫性腹膜炎。
  2. 病因病理:伤寒杆菌经口侵入,累及回肠末端淋巴组织,发病第 2 周形成与肠腔长轴平行的溃疡;80% 穿孔在距回盲瓣 50cm 内末端回肠,多单发,肠腔压力增高为诱因,穿孔后致弥漫性腹膜炎。
  3. 临床表现与诊断:确诊伤寒患者突发右下腹痛并扩散至全腹,伴腹膜炎体征,生命体征及实验室指标有特征性变化,X 线见气腹、腹腔穿刺抽脓液;脓液 / 血培养、肥达试验阳性可确诊;逍遥型无典型伤寒表现,易误诊为阑尾炎穿孔,需结合流行区 / 季鉴别。
  4. 治疗原则:确诊后尽快手术,以简单快速为原则;首选穿孔修补术,多发穿孔或大出血且全身状况允许者选肠切除吻合 / 造口;术后予营养支持、抗伤寒杆菌抗生素(氟喹诺酮类、三代头孢等)治疗。

第三部分 非感染性肠疾病

一、急性出血性肠炎

  1. 基础概况:原因未明的急性炎症病变,血便为主要症状,好发空肠 / 回肠,呈节段性分布,严重时病变融合。
  2. 病理特征:肠管扩张,腔内含血性液体 + 坏死物质;肠壁充血水肿、广泛出血坏死溃疡,严重者穿孔;腹腔有混浊或血性渗液。
  3. 临床表现:核心为急性腹痛、腹胀、呕吐、腹泻、便血 + 全身中毒症状;便血为血水样或果酱样腥臭便,肠坏死 / 穿孔时出现腹膜炎甚至中毒性休克;需与肠套叠、克罗恩病等鉴别。
  4. 治疗原则:先保守后手术;保守治疗包括禁食胃肠减压、纠正水电解质紊乱、广谱抗生素 + 甲硝唑抗感染、防治休克、静脉营养;手术适应证为腹膜炎、大出血、非手术治疗无效的肠梗阻;术式依病变范围选肠段切除吻合或造口,需准确判断肠管生机,避免广泛切除致短肠综合征。

二、克罗恩病

  1. 基础概况:病因未明,我国发病率上升,欧美多见,青少年高发,男性略多;可累及胃肠道任何部位,以回肠末段多见,多同时累及小肠 + 结肠,病变节段性分布。
  2. 病理特征:炎症累及肠壁全层,浆膜面充血水肿;黏膜有裂隙状深溃疡,呈鹅卵石样改变;肠壁增厚肉芽肿形成致腔狭窄;系膜受累水肿增厚,病变肠袢易粘连,溃疡穿透形成内 / 外瘘。
  3. 临床表现:起病缓慢,病史长;核心症状为腹泻、腹痛、体重下降,可有黏液血便;腹痛以右下腹 / 脐周痉挛性痛为主;可触及腹腔肿块,多表现为不完全性肠梗阻,少数以肛周病变首诊。
  4. 诊断鉴别:结合临床表现、内镜 + 病理、影像学及生化检查,结肠镜 + 活检、CTE/MRE 为关键检查;需与肠结核、溃疡性结肠炎等鉴别,急性发病者易误诊为阑尾炎,可通过病史、压痛范围及白细胞计数鉴别。
  5. 治疗原则:内科为基础,约 70% 患者需外科手术,术后复发率高;手术适应证为肠梗阻、脓肿、瘘管、大出血、癌变等;术式选病变肠管切除(切缘距正常肠管 2cm),推荐侧侧吻合,狭窄者可行狭窄成形术,术中疑诊者忌单纯切阑尾;围手术期需重视营养不良、激素 / 免疫抑制剂使用者的处理,高危患者术后需药物预防复发。

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  1. CONNECT:[ UseTime:0.000647s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001066s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000517s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000471s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000920s ]
  6. SELECT * FROM `set` [ RunTime:0.000392s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001045s ]
  8. SELECT * FROM `article` WHERE `id` = 474468 LIMIT 1 [ RunTime:0.008794s ]
  9. UPDATE `article` SET `lasttime` = 1776008111 WHERE `id` = 474468 [ RunTime:0.002176s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000592s ]
  11. SELECT * FROM `article` WHERE `id` < 474468 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001112s ]
  12. SELECT * FROM `article` WHERE `id` > 474468 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003073s ]
  13. SELECT * FROM `article` WHERE `id` < 474468 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.008291s ]
  14. SELECT * FROM `article` WHERE `id` < 474468 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002165s ]
  15. SELECT * FROM `article` WHERE `id` < 474468 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005506s ]
0.122085s