GERD and PUD Flashcards
What modulates gastric acid secretion?
paracrine (histamine), neuroendocrine (Ach), and endocrine (gastrin) pathways which activate their respective receptors (H2, M3, CCK2).
What limit extent of acid secretion
Somatostatin-secreting D cells and prostaglandins
What are some lifestyles that are related to developing heartburn?
High fat meals
tobacco
4 mechanisms for developing gastric reflux?
Decreased Lower Esophageal Sphincter Pressure
Prolonged Esophageal Clearance
Mucosal Resistance
Delayed Gastric Emptying Time
Food causes for decreased LES
fatty meals peppermint chocolate caffeine garlic onions chili pepers
1/2 of patients with GERD have prolonged ______ clearance.
acid
what are foods that are mucosal irritants?
spicy food
citrus juice
tomato juice
coffee
what is a medication used for osteoporosis where patients must take with a large glass of water and stay upright due to forming of an esophageal ulcer.
Alendronate
what are some lifestyle factors that can cause GERD?
Obesity smoking high-fat meals tight fitting clothing pregnancy stress laying flat
what is the body’s way of trying to handle extra acid?
Hypersalivation
How can you diagnose GERD
Hx
Endoscopy
24 hr ambulatory pH monitoring
Pre-emtively treating w/ omeprazole
Complications of GERD
Esophagitis
Esophageal strictures
Barrett’s esophagus
adenocarcinoma of esophagus
What are ways to suppress gastric acid production?
Antacids after meals and at bedtime
H2 histamine receptor antagonist
Covalent inhibitors of H+, K+-ATPASe of pariteal cells (PPIs)
What are some promotility therapies for GERD?
Metoclompramide (doapmine antagonist)
Bethanechol (cholinergic agent)
what is a disadvantage of antacids?
Short duration
must separate from other drugs (can prevent absorption)
What can magnesium antacids cause?
Diarrhea
What can aluminum based antacids cause?
constipation
What can calcium and sodium bicarb based antacids cause?
gas
what products can can cause fluid overload in pts. with CHF, renal failure, cirrhosis, pregnancy, or any salt-restricted diet; avoid in anyone taking supplemental calcium or with renal dysfunction
sodium bicarb
What are some clinically significant drugs that will bind to antacids
quinolone, isoniazid, tetracycline
Ferrous sulfate, quinidine, sulfonylurea
What is teh MOA of H2-receptor angatonists
reversibly inhibit histamine-2 receptors on parietal cells
Name some H2 receptor antagonists
Famotidine
Nizatidine
Ranitidine
How are H2 receptor antagonists excreted
Unchanged in urine
need dose adjustment with renal problems
What is a rare, reversible ADR of H2 receptor antagonists
thrombocytopenia
Drug that inhibits teh metabolism of warfarin, phenytoin, nideipine, propranolol
Cimetidine