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相关概念视频

Gastroesophageal Reflux Disease I: Meaning and Pathophysiology01:29

Gastroesophageal Reflux Disease I: Meaning and Pathophysiology

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Gastroesophageal Reflux Disease (GERD) involves the recurrent backflow of the stomach or duodenal contents into the esophagus, leading to troublesome symptoms and potential esophageal mucosal damage. Although GERD is often referred to as a disease, it is more accurately described as a syndrome, as it encompasses a range of symptoms and complications rather than a singular pathological entity, impacting a large number of individuals as the most prevalent upper gastrointestinal problem. Roughly...
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Barrett Esophagus-I: Introduction01:21

Barrett Esophagus-I: Introduction

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Barrett's esophagus is a medical condition where the esophageal mucosa is significantly damaged by stomach acid or other digestive fluids, often due to long-term exposure associated with gastroesophageal reflux disease (GERD). In GERD, a weakened or abnormally relaxed lower esophageal sphincter allows stomach acid to flow persistently into the esophagus.
This constant acid exposure transforms the esophagus's pink mucosal lining (stratified squamous epithelium) into a type of lining more...
1.5K
Barrett Esophagus-II: Clinical Manifestations and Management01:21

Barrett Esophagus-II: Clinical Manifestations and Management

1.8K
Individuals with Barrett's esophagus are often asymptomatic, but they may experience symptoms commonly associated with GERD, such as heartburn and acid regurgitation. Additional symptoms can include difficulty swallowing, chest pain, unintentional weight loss, blood in the stool (which may appear black, tarry, or bloody), and episodes of vomiting.
To diagnose Barrett's esophagus, healthcare providers often recommend an endoscopy for those showing symptoms of acid reflux. The procedure...
1.8K
Esophageal Achalasia01:27

Esophageal Achalasia

79
Esophageal achalasia is a chronic neurogenic disorder characterized by impaired relaxation of the lower esophageal sphincter (LES) and absent or ineffective peristalsis in the distal esophagus. This leads to a functional obstruction without a physical blockage, despite significant disruption of esophageal motility.EtiologyAchalasia is caused by degeneration of the myenteric (Auerbach's) plexus, specifically the loss of inhibitory ganglion cells that produce vasoactive intestinal peptide...
79
Gastroesophageal Reflux Disease01:25

Gastroesophageal Reflux Disease

69
Gastroesophageal reflux disease (GERD) is the backward flow of stomach contents (acid, pepsin, or bile) into the esophagus, causing mucosal inflammation known as esophagitis. It results from failure of antireflux mechanisms, mainly the lower esophageal sphincter (LES), influenced by mechanical and physiological factors.Etiology and Risk FactorsGERD develops when LES function is weakened or when intra-abdominal pressure increases. Risk factors include aging, obesity, and sliding hiatal hernia,...
69
Gastritis II: Pathophysiology01:26

Gastritis II: Pathophysiology

89
The pathophysiology of gastritis begins with the colonization of the stomach lining by Helicobacter pylori (H. pylori). This bacterium spreads mainly via the oral-oral route through saliva or shared utensils, and can also be transmitted in overcrowded or unhygienic environments through contaminated water, despite its brief survival outside the body.ColonizationOnce ingested, H. pylori enters the stomach and begins colonization by navigating through the mucus layer lining the stomach wall. It...
89

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相关实验视频

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Surgical Models of Gastroesophageal Reflux with Mice
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胃食道逆流,巴雷特食道和食道癌症:科学审查

Nicholas Shaheen1, David F Ransohoff

  • 1Division of Digestive Diseases and Nutrition, Center for Esophageal Disease and Swallowing, CB#7080, University of North Carolina-Chapel Hill, Chapel Hill, NC 27599-7080, USA. nshaheen@med.unc.edu

JAMA
|April 19, 2002
PubMed
概括

胃食道逆流性疾病 (GERD) 与食道腺癌有关,但患有GERD的人的癌症风险很低. 由于疗效证据不足,不建议对GERD患者进行常规内镜查.

科学领域:

  • 胃肠病学 胃肠病学
  • 在瘤学瘤学.
  • 流行病学 流行病学

背景情况:

  • 胃食道逆流性疾病 (GERD) 是食道腺癌的一个确定的危险因素.
  • 巴雷特食道 (Barrett esophagus) 是食道内膜的转化性变化,是这种癌症的已知前体,与慢性反流有关.
  • 食道腺癌发病率的增加需要评估风险人群的查策略.

研究的目的:

  • 审查关于GERD,巴雷特食道和食道腺癌之间的联系的现有证据.
  • 评估上部内镜作为一种查工具的有效性,以检测患有GERD的个体的食道腺癌.

主要方法:

  • 在MEDLINE (1968-2001) 进行了全面的文献搜索,搜索了关于GERD,腺癌和巴雷特食道的英语报告.
  • 研究选择优先考虑随机对照试验,其次是病例控制研究,然后是队列研究.
  • 搜索术语包括"胃食道逆流"",腺癌"和"巴雷特食道",以及相关的子标题. 还审查了临床指导方针.

主要成果:

  • 队列研究表明,近50%的美国成年人每月都会出现GERD症状,20%的人每周都会出现症状.
  • 病例控制研究显示,反流症状与食道腺癌风险之间存在正相关性,长期或严重症状加剧了这种相关性.
  • 尽管存在这种关联,但由于癌症的罕见性和症状的普遍性,GERD患者的绝对癌症风险很低. 没有任何试验表明查内镜减少了癌症发病率或改善了存活率.

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结论:

  • 强有力的证据证实了GERD和食道腺癌之间的联系,巴雷特食道是常见的前体.
  • 然而,对于那些患有GERD的人来说,发展食道腺癌的个体风险仍然很低.
  • 目前的证据不足以支持在患有慢性GERD症状的患者中进行食道腺癌的常规内镜查,因为疗效尚未得到证实.