GI Disorders Flashcards
What is the Z-line?
Transition from stratified squamous epithelium of esophagus to simple columnar epithelium in stomach
What controls peristalsis in the esophagus?
Auerbach’s plexus
This is a decrease in LES pressure, causing it to open + gastric contents to reflux into esophagus when supine (laying down)
GERD
This is when herniation of a portion of the stomach goes into thoracic cavity through diaphragm
Hiatal hernia
If GERD is untreated, it may lead to what 2 issues?
- Metaplasia = Barrett’s
2. Dysplasia = Neoplasia
What are the 4 tests for GERD?
- Barium swallow
- Upper GI series
- Monitor esoph. PH
- Upper endoscopy (test of choice)
This is an adaptive replacement (metaplasia) of esophageal squamous epithelium with columnar found in stomach and intestine. Complication of GERD
Barrett’s Esophagus/epithelium
- 1% are malignant
This presents late with dysphagia; not diagnosed until after metastasis; Tp53 found in 50% of scc
Esophageal cancer
What are the 2 types of esophageal cancer?
- Squamous cell
2. Adenocarcinoma
This causes pepsinogen to convert to pepsin in low pH; enyzyme that hydrolyzes protein to polypeptides
Chief cells
This secretes HCL acid + intrinsic factor
Parietal cells
These cells secrete mucus in the stomach
Cardiac glands + mucus neck cells
These cells contain gastrin that stimulates secretion of HCl, Pepsin, Intrinsic factor, histamine type 2
G cells
What 4 things control stomach acid secretion?
- Gastrin
- Vagus nerve
- Histamine 2 from amst cells in mucosa
- Proton pumps in parietal cells
What inhibits stomach acid secretion
Prostaglandins
This is the inflammation + breakdown of gastric mucosal barrier leading to edema and erythema
Gastritis
This is an erosion or ulcer where acid-pepsin are exposed to mucosa
Peptic Ulcer Disease
What is the most common drug that causes PUD?
NSAIDs (decreases prostaglandin synthesis which decreases mucus and bicarbonate)
What’s the most common infectious cause of PUD?
H. Pylori
This is a type of peptic ulcer (20% of PUD); found more in men; >50-60yo; main cause is H. Pylori; patients vomit blood
Gastric Ulcers
90% of gastric ulcers are found where? Can they become malignant?
Antrum and lesser curvature, anterior
- yes 4% become cancer
This is a type of peptic ulcer (80%), found = in men and women; ~40 yos; H. pylori was main cause; patients poop blood
Duodenal Ulcers
90% of duodenal ulcers occur where? are they cancerous?
- in duodenal bulb
- almost never malignant
What are the main risk factors of duodenal ulcers?
- Cirrhosis of liver
2. Type O blood
What is the triple therapy to treat H. Pylori?
- Amoxicillin
- H-2 blocker
- Metronidazole (Flagyl)