Drugs Affecting the GI PowerPoint Flashcards
THe glands that Trina talked about secrete mucus, pepsinogen, bicarbonate, hydrocholoric acid (HCL), intrinsic factor, gastrin, serotonin, and hormonal products are:
- Gastrin producing cells=gasrin (hormone)
- Parietal Cells=HCL acid, intrinsic factor
- Chief Cells=pepsinogen=pepsin (enzyme)
- Mucus producing cells=mucus
- Enterochromaffin-like cells (ECL)=histamine
- D-cells=somatostatin (inhibititory slows everything down)
What hormone causes the production of HCL and pepsinogen and what three factors stimulate that hormone to initiate the above said process:
Gastrin causes HCL and pepsinogen initiated by three factors:
- Sight/smell/taste–>vagus nerve
- Distension of the stomach
- Partially digested protein or caffeine
What occurs when there’s food in the stomach:
Food in the stomach causes the release of histamine
- Chyme enters the duodenum, gastrin is released, fats in the duodenum, inhibitory hormones are released
FYI: Body produces about how much in gastric secretions and how long does it take for the stomach to empty of its contents:
- 0.5-3 L of secretions
- Diets high in fats takes about 2 h for the stomach to empty
How is chyme produced:
the fats slow stomach emptying, mixes w/alkaline juices in duodenum to neutralize acids
What are (or what do they do) pancreatic juices:
enzymes that breakdown nutrients
- Amylase breaks down carbs
- Lipase breaks down fats
- Protease breaks down protein
What does bile secreted from the liver do:
Bile salts emulsify fats to improve digestion aiding in the breakdown of fats
What are the general antiulcer (and issues of the upper GI) drugs that I need to know for the test:
- antaicds
- H2 Receptor Antagonist (blocker)
- Proton Pump Inhibitors (PPIs)
- Pepsin Inhibitor
- Prostaglandin Analog
What is the action of antacids:
Antacids are alkaline which will neutralize gastric acidity by increasing the pH to interfere with pepsin activity
What are the anteacids that I need to know for the exam, how are they excreted, and when are they Rx/used:
Amp and 3 Ms
Amphojel, Maalox, Mylanta, MOM
- Rx for indegestion (bloated feeling), heart burn (R/O from chest pain first), GERD, PUD (peptic ulcer disease), hyperphosphatemia
What are the GI effects and the caution of the antacids:
- MOM (mg hydroxide) GI=diarrhea; Caution=excretes high Mg in urine, excreted in breast milk
- Maalox and Mylanta (Aluminum Mg) GI=no diarrhea/constipation; caution=no caution
- Amphojel (aluminum hydroxide) GI=constpation; cauton=h_ypophostameia d/t binding to dietary phosphate,_ Aluminum toxicity causing decreased LOC and RENAL PROBLEMS
Why are antacids given 2 hrs apart from other medications and why are antacids administered 1 (+) h prior to enteric-coated tablets:
- antacids increases the pH (gastric secretions becomes more alkaline) thus affecting the absorption of most medications in the GI
- Antacids causes premature dissolution of enteric-coated tabs
What labs are most important to assess prior and after the administration of antacids:
electrolyte imbalances: Mg, Al, phosphate
also assess changes in elimination
What are the nsg teachings when administering antacids:
- Take antacids 1-3 h after meals (when gastric secretions are the highest)
- Take antacids 1 h apart before taking enteric coated tablets
- drink water to dilute the chalkiness
- shake suspension well
- pts w/HF or HTN should look for antacids with low-Na content as the ones I need to know for the test are high in Na
What are the actions of H2 receptor antagonist:
H2 receptor antagonists inhibit gastric acid secretion by inhibiting the action of histamine at H2 receptors in the parietal cells
What are the type of H2 receptor antagonists that I need to know for the test and what are there indications:
The 3 “-dines”
- Cimetidine (Tagamet)
- Famotidine (Pepcid)
- Ranitidine (Zantac)
H2 receptor antagonists are Rx for pts UGIB (upper GI bleed), GERD, Zollinger-Ellison Syndrome (ZES is a rare condition where pts develop pancreatic/duodenum tumors which leaks gastric HCL acid and causes ulcers-not caused by foods), PUD (peptic ulcer disease)
What are the S/S and caution when taking Rx H2 receptor blockers:
- S/S: most common are neurologic (HA, dizziness, confusion)
- Caution: Elderly (d/t the neurological S/S), impaired renal/hepatic function, pregnancy/breast feeding (fetal developmental issues)
- Take 2 h apart if also taking w/antacids
What are the adverse reactions with Cimetidine:
Psychosis issues:
- N_eurological: hallucination, severe depression, paranoia, psychosis (never give this med to the elderly)_
- toxicity d/t drug interactions
- NEVER GIVEN rapid infusion d/t arrhythmias and decreased BP
Cimetidine is NEVER PUSHED; only IVPB and infused for over an hour
What are the adverse effects with Famotidine and Ranitidine:
- Famotidine: hematological effects (Neutropenia; long-term use=thrombocytopenia)
- Ranitidine: hematological effects (Leukopenia, thromboycytopenia, impotence)
these meds can be pushed
What are the important NSG assessments when pts are taking H2 receptor antagonisrs:
Labs: AST/ALT/BUN/Cr d/t the H2 receptor antagonist meds efffects
LOC assessments d/t the H2 receptor antagonist nerological effects
What are some important pt teaching when taking H2 receptor antagonists meds:
- To take 2 h apart if taking antacids
- avoid tasks that require alertness during initial Tx w/H2 receptor antagonists meds until LOC can be assessed for S/S
- Avoid smoking, ASA, caffeine, EtOH will undermine the efectiveness of the H2 receptor antagonist
- Report HA, persistance of GI symptoms (means that they need a new Dx if not resolved by H2 meds)
What is the action on the body when taking a proton pump inhibitor:
The PPI blocks gastric acid secretions by inhibiting enzyme system (H+/K+ ATPase), the proton pump in the parietal cells
This disables that ATPase enzyme pump from pumping out acid. The pump takes a few days for it to duplicate itself so that it may pump out acid
What are the PPIs (proton pump inhibitor) that I need to know for my exam and when are they Rx:
The 3-Ps
- Prevacid
- Protonix
- Prilosec
The proton pump inhibitor are Rx for PUD (petic ulcer disease), GERD, ZES, esophagitis, H.pylori infection, NSAID ulcers
What are the important caution and S/S when taking proton pump inhibitor (PPIs):
- Caution: Liver pt (meds are metabolized in the liver), pregnant, lactating women
- S/S: GI issues are rare but is linked to increase C.diff risk
- Adverse: long-term use causes hypomg and hip fx (these effects are very rare)
What are some important NSG assessments in pts on proton pump inhibitors:
- Assess theraputic response: if pt is not getting any better, than pt needs a new Dx
- Labs: Mg and liver
- Taken: EMPTY STOMACH and don’t CRUSH OR CHEW capsules
- Cause absorption issues with: sucralfate/phenytonin/amx/digoxin
What is the action of a Pepsin Inhibitor:
Pepsin Inhibitor acts like a bandage barrier that protects damaged gastric mucosa. It forms a adhesive barier at the ulcer site via binding with proteins.
What are the Pepcin inhibiting drugs that I need to know for the exam and what are the reasons they are Rx:
“fate”
sucralfate (Carafate) is Rx for ulcers
What are the S/S and interactions needed to know about pepsin inhibitors:
- S/S: constipation d/t elimination in the urine as whole
- Interactions: sucralate is given 2 h apart from other meds d/t affecting absorption
- Sucralate becomes less effective if taken with antacids d/t action of the antacids (1-3 h apart)
- Give sucralfate 1 h before meals and HS
- PPIs are given 30 min apart from sucralfate
What is the action of prostaglandin analogs:
Prostaglandin analogs decrease gastric acid secretion and increases mucus and bicarbonate production
What are the examples of Prostaglandin analog drugs that I need to know and when are they Rx:
(Remeber PG meds for cervix)
Cytotec (misoprostol) is Rx for ulcers d/t NSAID therapy
What are the S/S, contrainindications needed to know for prostaglandin analog:
- S/S: BLACK BOX WARNING d/t causing harm to fetus and severe diarrhea to babies from breast feeding (class X)
What is the leading cause of PUD (peptic ulcer disease) and how is it contracted:
H. pylori therapy can be contracted from wither kissing or contaminated water bottles
What is the 1st line of therapy for H. pylori (PUD):
7-10 day therapy utilizing 1 PPI and 2 axb and is about 91 (+)% effective if pts remain compliant to length/duration of Tx