GI: Disorders of Upper/Lower Systems Flashcards
Emesis Defense Mechanism
rid of toxic substances
“vomiting center”
in medulla
Emetics
induce vomiting emergency only (poisons/overdose) > risk for aspiration/exacerbation of tissues if caustic substance
Intractable n/v =
suspect bowel obstruction
Afferent/vagal splanchnic fibers
stimulate vomiting
distension irritation infection obstruction dysmotility
receptor: vagal, 5-HT
Vestibular System
stimulate vomiting
motion infection
receptors: histamine, muscarinic, cholinergic
Higher CNS Centers
stimulate vomiting
ICP infection tumor hemorrhage sights smells emotions
Receptors: various
Chemoreceptor Trigger Zone
located outside BBB (near medulla)
stimulate vomiting
opioids chemo toxins hypoxia uremia acidosis radiation therapy
Receptors: 5-HT and Dopamine
CAM Antiemetics
peppermint
ginger
Serotonin Receptor Antagonist (AntiEmetics)
ondansetron (-trons)
block 5HT receptors
TX: prophylaxis of chemo/radiation induced N/V and post op N/V
SE: constipation diarrhea headache hypoxia [severe: prolonged QT torsades serotonin syndrome]
interx: SSRIs/SNRIs/MAOIs/mirtazpine/fentanyl/lithium/tramadol (serotonin syndrome)
C
Anticholinergic/Antihistamines (AntiEmetics)
scopolamine, meclizine
tx: post op N/V, motion sickness
SE: xerostomia dizziness somnolence blurred vision mydriasis (dilation) [serious: glaucoma psychotic disorder eclampsia]
contra: acute angle glaucoma
interx: other anticholinergics/cns depressants
C
Phenothiazines
Antiemetic/Anti Dopaminergic/Anti Psychotic
prochlorperazine promethazine
blocks dopamine receptors in brain/inhibits signals to vomiting center in medulla
TX: severe n/v, given rectally but also po/im
SE: anticholinergic symptoms dry mouth sedation constipation orthostatic hypotension tachycardia extrapyramidal symptoms
BBW: elderly w/ dementia = death
contra: comatose pts, children <2/<20lbs, narrow-angle glaucoma, BMS, severe hepatic/cardiac impairment
interx: CNS depressants
TCAs = hypotensive effects/anticholinergic effects
C
Benzamides (Antiemetic/Antidopaminergic)
metoclopramide trimethobenzamide HCL
promotes motility in upper GI tract/increases gastric emptying
TX: chemo/GERD/gastroparesis/post-op N/V
SE: fluid retention headache somnolence fatigue [serious: nms tardive dyskinesia]
BBW: irreversible tardive dyskinesia
contra: epilepsy, GI hemorrhage, obstruction/perforation, pheochromocytoma (htn crisis)
interx: antipsychotics, snris, ssris, tcas (nms) - decreased digoxin levels, insulin (hyperglycemia)
C
Esophageal Disorders common manifestations
pain
alteration in ingestion
bleeding
Acquired esophageal disorders
rings/webs
diverticula
tumors
hiatal hernia
congenital esophageal disorders
webs
esophageal atresia
traumatic esophageal disorders
perforation
mallory-weiss tear
foreign bodies
food impaction
motiilty esophageal disorders
dysphagia
achalasia
diffuse esophageal spasms
mucosal integrity esophageal disorders
GERD
barret esophagus
esophagitis
System disease r/tesophageal
scleroderma esophagus
dermatologic disease
Esophageal rings
circular ring either membrane or muscular around esophageal lumen (not always narrowing)
B Ring
most common
found at gastroesophageal junction (membraneous)
Schatzi Ring
cases dysphagia
symptomatic B ring
A Ring
less common
occurs higher in lower esophagus
muscular in nature
Esophageal Rings s/s
can be asymptomatic
dysphagia dependent on degree of obstruction
dysphagia often chronic/episodic
symptoms of heartburn/regurgitation
esophageal rings tx
dietary restrictions
first ling: endoscopic dilation therapy
incisional is eh
Esophageal Webs
tin, membranous tissue in esophageal lumen
decreases diameter of esophageal lumen
can be congenital or acquired
esophageal webs s/s
can be asymptomatic typical presentation: dysphagia w/ solids acute food impaction nasopharyngeal reflux/aspiration spontaneous perforation
esophageal webs tx
dietary restrictions
first ling: endoscopic dilation therapy
esophagitis
irritation and inflammation of esophageal tissues leads to esophageal damage
types of esophagitis
eosinophilic (many causes)
radiation (tx of thoracic cancers)
corrosive
pill (lodged pill)
Esophageal diverticula
pressure increase in esophageal lumen > mucosa protrudes thru weakened wall > produces outpouching
esophageal diverticula eitology
acquired
most common in impaired motility of esophagus
can be r/t inflammatory disease of mediastinum
esophageal diverticula s/s
mostly asymptomatic can have dysphagia/heartburn gurgling audible during swallowing with stethoscope maybe neck mass if large need a scope to confirm
esophageal diverticula tx
depends
surgical for large (but risk for irritation/inflammation)
esophageal perforation
tear/rupture and hole through esophageal layers
esophageal perforation causes
endoscopy/ng tube insertion/intraoperative injury foreign body caustic substance blunt/penetrating trauma malignancy/infection forceful vomiting
esophageal perforation s/s
pain pneumomediastinum crepitus system infection/sepsis hematemesis (mallory-weiss tear)
esophageal perforation tx
varies always npo decompressive therapies esophageal stent surgery
hiatal hernia
herniation of stomach through esophageal hiatus of diaphragm
lower esophageal sphincter permits reflux of gastric contents
sliding or paraesophageal
multifactoral
Hiatal Hernia s/s
can by asymptotic
involves symptoms of gerd
type 4 (dyspnea, exercise intolerance, syncope, audible bowel sounds @ lung base)
hiatal hernia tx
medications for symptomatic gastric reflux
maybe surgery
Gastroesophageal Reflux Disease
failure of LES and diaphragm to prevent reentry of gastric contents
reflux of acid/pepsin/bile in esophagus
development of esophageal erosions/ulcerations
multifactorial
GERD risk factors
decreased LES tone pregnancy obesity impaired gastric motility surgical vagotomy decreased edogenous gastrin levels
GERD s/s
heartburn epigastric pain regurgitation after meals
extra-esophageal symptoms: acid injury to tooth enamel, throat pain, hoarseness, dysphonia, excessive throat clearing, chronic cough, globus, dysphagia
serious comp: esophageal cancer
GERD TX
medication (PPI h2 receptor blockers antacids)
diet
behavioral/lifestyle changes
surgery
Barret Esophagus
chronic exposure to gastric secretions (GERD)
esophageal stem cell metaplasia into columnar cells (rougher and pink)
can devlop carcinoma
Barrett Esophagus s/s
heartburn
regurgitation
Barret Esophagus tx
aggressive treatment of GERD (reversible)
biopsies
Esophageal Cancer
division of abnormal cells in esophagus = malignant growth/tumor
RF: smoking, GERD, obesity
esophageal cancer s/s
progressive dysphagia for solids weight loss heartburn hoarseness dry cough pneumonia odynophagia
esophageal cancer tx
chemo/radiation/surgery
palliative stenting
prevention: fruits/veggies in diet
associated cardinal GI symptoms
pain
altered ingestion
altered digestion
gi bleeding
stomach disorders of secretion
peptic ulcer disease ulcers gastrinoma gastritis stomach cancer
stomach disorders of motility
gastroparesis
gastric outlet obstruction
pyloric stenosis
peptic ulcer disease
increased gastric acid secretion (pepsin & HCl) > weakened mucosa > erosion/ulceration
peptic ulcer disease causes
most common: h. pylori infection/NSAIDS
Risk factors: smoking, caffeine, excessive alcohol/drug use, stress
PUD s/s
may be asymptomatic
epigastric pain/dyspepsia > bleeding/obstruction > perforation/peritonitis (x-ray will show free air under diaphragm)