Gastroenterology Flashcards
recent MI, combative patient, and intestinal perforation
relative contraindication to GI endoscopy
procedure of choice for: evaluation of odynophagia, finding PUD, before PUD surgery, if GERD treatment fails, alarm signals, UGI bleeds, dysphagia AFTER barium swallow, foreign body removal, small bowel disease, persistent dysphagia, placement of feeding or drainage tubes
EGD (esophagogastroduodenoscopy)
if patient has a possible bile duct obstruction give antibiotics before
ERCP (endoscopic retrograde cholangiopancreatography)
biliary obstruction, dx/tx pancreatic duct obstruction, dx of PSC (primary schlerosing cholangitis), tx of choledocholithiasis with cholangitis are indications for…
ERCP
further eval of abnormal biliary or pancreatic duct imaging from CT/MRCP/EUS
other indications for…
ERCP
ERCP is CONTRAINDICATED in ACUTE pancreatitis, except:
- impacted gallstones
2. ascending cholangitis (bacterial infection causing cholangitis)
bile duct obstruction, chronic pancreatitis, if acute pancreatitis doesn’t get better, and is the test of choice for PSC (primary sclerosis cholangitis)
MRCP (magnetic resonance cholangiopancreatography)
what visualizes the bile tract?
retrograde cholangiography
what visualizes the pancreatic duct?
retrograde pancreatography
staging GIT, biliary tree, and pancreatic malignancy
diagnosing chronic pancreatitis
dx/tx pancreatitis complications
providing access to pancreatic duct or biliary tree
EUS (endoscopic ultrasonography)
normal swallowing
deglutition
when swallowing doesn’t proceed appropriately for any reason
dysphagia
pain with swallowing
odynophagia
3 main causes of dysphagia
- transfer disorders (oropharyngeal)
- anatomic/structural disorders
- motility disorders
you should always work up this disorder and NOT treat it empirically
dysphagia
usually the 1st test performed to work up dysphagia
barium swallow
definitely the 1st test performed to work up dysphagia if symptoms are SEVERE, or new-onset dysphagia with LIQUIDS
barium swallow
why is barrium swallow done before endoscopy?
- avoid risk of PERFORATION if there’s DIVERTICULA or OBSTRUCTION
- may not need endoscopy if barium swallow is enough
- gives endoscopist idea of what to expect
if a patient has h/o reflux and presents with slight-to-moderate dysphagia for solids you can do this test first
EGD
generally only done if dysphagia persists after negative barium swallow and EGD
esophageal manometry
general workup of dysphagia
- barium swallow
- endoscopy
- manometry study
chest pain, dysphagia for SOLIDS and LIQUIDS, usually years, regurgitation
achalasia
finding on barium swallow in achalasia
bird-beak narrowing distally
done to diagnose and exclude a tumor at esophagogastric junction (“pseudoachalasia”)
EGD
done to confirm dx of achalasia before tx
esophageal manometry
absence of normal peristalsis, and non-relaxing LES
manometry findings in achalasia
3 distinct subtypes of achalasia seen using high resolution manometry
- traditional aperistalsis
- esophageal compression
- generalized spasm
if you’re thinking of achalasia and see the following:
RAPID onset of symptoms, patient older than 60 years, PROGRESSIVE symptoms, and profound WEIGHT LOSS
you should worry about this…
cancer!
pseudoachalasia or secondary achalasia
3 treatment options for achalasia
- pneumatic dilation
- onabotulinum-toxin A (Botox)
- surgical myotomy (done via laparoscope)
how effective is Botox for achalasia, and how often do you need to repeat therapy?
- works 65% of cases
- need to repeat every 6-12 months
- not the greatest, but a decent alternative in patients who are high-risk for surgery
simultaneous, nonperistaltic concentration of esophagus, worse with COLD or CARBONATED liquids
diffuse esophageal spasm (DES)
causes esophageal spasms even without typical reflux symptoms
OCCULT REFLUX
barium swallow for DES shows what?
generally normal, but can show CORKSCREW pattern
Type 3 achalasia, with excess, simultaneous (nonperistaltic) contractions in distal esophagus with NORMAL LES relaxation
high resolution manometry findings of DES
what test is not helpful in DES workup?
EGD
what should be done if REFLUX is considered a possible cause of DES?
- 24-hour esophageal pH recording, OR
- PPI BID for 3 months
most important part of DES tx
REASSURANCE
if reassurance isn’t enough, treat DES with these:
1st line: DILTIAZEM or IMIPRAMINE
2nd line: isosorbide or sildenafil
3rd line: botulinum toxin injection
SLOWLY PROGRESSIVE dysphagia- INITIALLY TO SOLIDS, then liquids
anatomic obstruction
- Schatzki ring in YOUNGER patients
- CANCER, or STRICTURE in OLDER patients
main problem: sxs are…: sxs precipitated by…
- anatomic: intermittent: solids
- anatomic: progressive: solids, THEN liquids
- anatomic: progressive: solids, THEN liquids
- motility/neurologic: longstanding: solids, AND liquids
- motility/neurologic: intermittent: solids, AND liquids (esp. COLD)
- various: progressive: solids AND liquids
disease
- Schatzki ring
- esophageal stricture
- cancer
- achalasia
- DES
- systemic sclerosis
common cause of dysphagia, YOUNGER patients
lower esophageal ring or Schatzki ring
very slowly progressive, INTERMITTENT, SOLID FOOD dysphagia (meat and bread)
lower esophageal ring or Schatzki ring
lower esophageal ring or Schatzki ring is ALWAYS associated with…
HIATAL HERNIA
treatment for lower esophageal ring or Schatzki ring
1a. dilation (with bougie method),
1b. or (through-the-scope) hydrostatic balloon
2. THEN PPIs
slowly progressive, CONSTANT (not intermittent) dysphagia for SOLID FOODS
esophageal stricture
esophageal strictures are commonly d/t
ACID REFLUX
other causes of esophageal strictures
- PROLONGED NASOGASTRIC TUBE placement
2. LYE INGESTION
barium swallow for esophageal stricture shows what?
narrowing at esophagogastric junction
how do you treat esophageal stricture?
dilation
what are the 3 causes of malignant esophageal obstruction?
- esophageal adenocarcinoma
- squamous cell carcinoma
- extrinsic compression from NONesophageal primary cancers
this PROGRESSION of symptoms: SOLID food dysphagia to SOFT food, finally dysphagia with LIQUIDS
is what until proven otherwise?
esophageal malignancy
a rare d/o that causes dysphagia d/t UPPER esophageal web
Plummer-Vinson syndrome
what type of dysphagia is found in POSTMENOPAUSAL WOMEN, is associated with IRON-DEFICIENCY ANEMIA, and has a slightly increased risk of squamous cell esophageal cancer?
Plummer-Vinson syndrome
dysphagia to both SOLIDS AND LIQUIDS from time of onset
some sort of neurologic dysfunction
examples of neurological dysfunctions causing dysphagia
- STROKE
- PARKINSONISM
- BULBAR PALSY (lower motor neuron- ALS, MS)
- PSEUDOBULBAR PALSY (upper motor neuron- ALS)
if you suspect aspiration d/t neurologic dysfunction, what’s the next best step?
BARIUM SWALLOW to confirm dx
more than 80% of what patients have involvement of esophagus?
diffuse SSc (systemic sclerosis)
what is the LES pressure in patients with dysphagia d/t systemic sclerosis?
“wide-open” with low or NO tone/pressure
causes severe acid reflux
what are the 3 possible causes of dysphagia in systemic sclerosis? and what is the workup?
- esophagitis
- stricture
- impaired motility
barium swallow then EGD (to look for all 3)
if you have esophagitis in a SSc patient what do you do?
- aggressive PPI tx
- FOLLOW-UP endoscopy at 2-3 MONTHS to make sure it’s working and/or dilate strictures if any
what rheumatological diseases can present with dysphagia like SSc?
polymyositis and dermatomyositis
immune-mediated chronic eosinophil-predominant inflammatory d/o of esophagus
eosinophilic (allergic) esophagitis
pathogenesis involves interleukin-5 (IL-5) and eotaxin
eosinophilic (allergic) esophagitis
occurs most commonly in MEN age 20-40 years
eosinophilic (allergic) esophagitis
strong association with ALLERGIES; environmental, food, asthma, and atopy
eosinophilic (allergic) esophagitis
IgE is elevated in 2/3 of patients
eosinophilic (allergic) esophagitis
leading symptom is recurrent attacks of dysphagia with food impaction, and usually goes undiagnosed for 4-5 years
eosinophilic (allergic) esophagitis
if you have PERIPHERAL eosinophilia symptoms are _____, and is found in what percentage of patients?
WORSE
~ 30% of patients
SCALLOPED APPEARANCE with ridges or rings (trachealization) in esophagus
“classic” EGD finding of EoE
how do you confirm dx of EoE?
esophageal biopsies showing dense eosinophilic infiltration of esophageal epithelium (> 15 eos/HPF)
which patients also have increased eosinophils?
GERD patients
EoE tx?
- allergy testing
- avoid potential allergens
- fluticasone (BID) or viscous budesonide (usually results in a response within 1 week)
for patients with EoE, and concomitant reflux, or PPI-responsive eosinophilic esophagitis, what medication, in addition to steroids, can be added to help with tx?
PPI
odynophagia (painful swallowing) is usually d/t what?
- pill-induced esophagitis
2. opportunistic infections
common causes of pill-induced esophagitis
- doxycycline (teenager with acne)
- KCl
- ASA
- NSAIDs
- iron
- bisphosphonates (alendronate)
- quinidine
dx and tx of pill-induced esophagitis
- made solely on history
- sit in upright position and drink plenty of water
opportunistic infections (OIs) occur in these patients:
- immunocompromised: HIV, or diabetes
- immunocompetent taking corticosteroids
common OIs are:
- Candida
- herpes simplex virus (HSV)
- cytomegalovirus (CMV)
what to do with esophagitis with thrush in the mouth?
- treat Candida empirically with FLUCONAZOLE
- if it doesn’t get better, EGD with biopsy
what is a genetic variable that affects PPI efficacy? and which gives the best results?
- slow, moderate, and fast metabolizers
- slow metabolizers have MUCH better results than fast metabolizers
short term adverse effect of PPI
COMMUNITY-ACQUIRED PNEUMONIA (CAP)
more likely within 30 days, especially within 48 hours of initialization
long term adverse effects of PPI
- FRACTURE risk is increased
- HYPOMAGNESEMIA (muscle spasms, arrhythmias, seizures)
what happens when you stop PPIs abruptly after several months?
REBOUND ACID HYPERSECRETION (especially in H. pylori-NEGATIVE patients)
should you use a PPI long-term?
when is long-term use of PPIs necessary?
no, it’s discouraged
Barrett esophagus
PPIs DECREASE absorption and serum levels of
THYROXINE and ITRACONAZOLE/KETOCONAZOLE
PPIs INCREASE absorption and serum levels of
DIGOXIN
can you give clopidogrel with omeprazole?
YES, benefits outweigh risk
more studies needed for slow metabolizers of clopidogrel
gastroesophageal reflux is a result of…
transient relaxation of lower esophageal sphincter (LES)
motilin, acetylcholine, and maybe gastrin INCREASE…
LES pressure
progesterone (pregnancy increases GE reflux), chocolate, smoking, some medications (anticholinergics, especially) DECREASE…
LES pressure
persistent, nonproductive cough, hoarse voice, clearing of throat, fullness of throat, suspect…
gastroesophageal reflux disease (GERD)
most common non-cardiac chest pain (70%) cause
GERD
nocturnal cough frequent sore throat hoarseness, laryngitis, clearing of throat loss of dental enamel exacerbation of asthma VCD (vocal cord dysfunction)
extraesophageal manifestations of GERD
what should you always ask about in the w/u of GERD patients?
ASTHMA SYMPTOMS; especially if they occur at night
w/u of suspected GERD depending on situation (6 scenarios)
- heartburn alone –> trial treatment –> improvement
- ALARM SYMPTOMS or persistent GERD symptoms –> endoscopy
- erosive esophagitis: if immunocompetent –> treat
- erosive esophagitis: if immunocompromised –> treat based on biopsy
- stricture –> treat
- normal= nonerosive reflux disease (NERD) (62% of patients) –> do NOTHING
spasm of vocal cords with associated INSPIRATORY stridor
vocal cord dysfunction (VCD)
associated with increased incidence of both GERD and asthma
increased body mass index (BMI)
if you’re thinking Barrett esophagus in a GERD patient…
do an EGD
if patient has obstructive symptoms, do a barium swallow first
do a 24-hour esophageal pH MONITOR for atypical cases with impedance if:
- normal EGD and still have symptoms
- hoarseness, coughing, or atypical chest pain, but no sxs of GERD
- treatment failure to PPIs
MILD-TO-MODERATE GERD treatment
INITIAL:
- RAISE HEAD OF BED
- WEIGHT LOSS OF > 10LB if overweight
ANTISECRETORY drugs if unsuccessful
healing of esophagitis (not necessarily GERD) based on treatment
placebo= 25%
H2 blockers= 50%
PPIs= 80-95%
tx for SEVERE GERD
PPIs, indefinitely
fundoplication indications:
- patients REFRACTORY to medical tx
- YOUNG patients with SEVERE disease
- ALTERNATIVE to PPIs
patients with worse GERD symptoms (GERD-related cough, hoarseness) need…
stronger and longer treatment
Barrett esophagus is…
change from esophageal SQUAMOUS to columnar epithelium with goblet cells
SCREENING for Barrett’s is…
CONTROVERSIAL
recommended guidelines for Barrett screening
white males > 50
long-standing GERD
elevated BMI
Barrett esophagus is associated with kind of cancer?
ADENOCARCINOMA ONLY
not squamous cell carcinoma
incidence of adenocarcinoma in Barrett esophagus
30x normal rate
antireflux meds and surgery do what for Barrett esophagus?
they don’t reverse epithelial changes or eliminate cancer risk, but help with sxs
if Barrett esophagus is found, f/u endoscopies should be done based on findings
- no dysplasia: 3-5 years
- low-grade dysplasia: 6-12 months
- high-dysplasia without eradication therapy: 3 months
for HIGH-GRADE dysplasia in Barrett esophagus you should do ERADICATION therapy, which is…
radiofrequency ablation (RFA) or endoscopic mucosal resection (EMR)
what other eradication therapy can be done for HIGH-GRADE dysplasia in Barrett esophagus?
esophagectomy, but has HIGHER MORBIDITY
should be done in centers that SPECIALIZE in them
2 types of esophageal cancer:
1. adenocarcinoma, now more common occurs in DISTAL 1/3 2. squamous cell generally occurs in PROXIMAL 2/3 caused by SMOKING and ALCOHOL (especially hard liquor)
smoking and alcohol have what effect on squamous cell carcinoma of esophagus?
SYNERGISTIC (multiplicative, NOT additive) carcinogenic effect
squamous cell cancer of esophagus is strongly associated with…
geographic location, DIET, and ENVIRONMENT
usual presenting symptom of esophageal cancer
DYSPHAGIA
treatment of esophageal cancer, if:
small and localized, then…
large or metastasized, then…
surgical resection
combination chemotherapy (cisplatin and 5FU) PLUS radiation PRIOR to surgery
Zenker diverticulum is
outpouching of UPPER esophagus
common symptoms of Zenker diverticulum
FOUL-SMELLING BREATH
REGURGITATION of food eaten several days earlier
MCC of TRANSFER DYSPHAGIA (trouble initiating swallowing)
Zenker diverticulum
treatment of Zenker diverticulum
surgery
ENDOCRINAL stimulus for gastric acid release
gastrin (released by G cells in pylorus)
most important for postprandial gastric acid production
gastrin
PARACRINE stimulus for gastric acid release
histamine (released by ECL (enterochromaffin-like) cells in corpus)
neurocine effect, stimulation vagus nerve releases what onto G cells?
gastrin-releasing peptide
what decreases production of gastrin (and therefore gastric acid)
somatostatin and secretin
secretin is made by the duodenum when stomach is acidified causing:
- DECREASE in GASTRIN production
2. stimulates output of BICARBONATE from pancreas
serum gastrin level skyrockets, when?
patients with achlorhydria (autoimmune gastritis), or pernicious anemia
upper abdominal pain or discomfort especially after meals
dyspepsia
symptoms of dyspepsia
epigastric fullness, belching, bloating, gnawing pain, and heartburn
(generally not severe pain)
causes of dyspepsia
PUD, gastritis, GERD, biliary colic, gastroparesis, pancreatitis, and cancer
classification of dyspepsia by symptoms:
GERD-LIKE, ULCER-LIKE (improves on anti-ulcer therapy)
DYSMOTILITY-TYPE (improves on promotility drugs, such as metoclopramide)
recurrent upper abdominal pain with NORMAL EGD
NON-ULCER dyspepsia
treatment plan for dyspepsia
- discontinue NSAIDs
- test and treat if H. pylori +
- conduct a PPI treatment trial
- order EGD if alarm symptoms or failure of therapy
how is gastritis classified?
either histology or etiology
classification of gastritis by histology:
- superficial gastritis (early, neutrophils)
- atrophic gastritis (mid, lymphocytes)
- gastric atrophy (late, gastropathy aka metaplastic atrophic gastritis)
classification of gastritis by etiology:
type A: Autoimmune, Atrophic, pernicious Anemia, Achlorhydria
type B: MOST COMMON form chronic gastritis (80%)
what part of the stomach does type A gastritis affect?
PROXIMAL stomach (fundus and corpus only)
autoantibodies against BOTH intrinsic factor and parietal cells cause what?
pernicious Anemia and Achlorhydria, and secondary hypergastrinemia (> 1000 pg/mL)
common cause of type B gastritis
H. pylori infection
itraconazole, ketoconazole, and thyroxine require what?
GASTRIC ACID for optimal absorption
fluconazole does NOT
causes of erosive gastropathy (with subepithelial hemorrhage)
NSAIDS, ALCOHOL, or SEVERE PHYSIOLOGIC STRESS
onset of erosive gastropathy in the ICU suggests
STRESS-RELATED MUCOSAL DAMAGE (SRMD)
a. major surgery
b. burns
c. severe CNS injuries
d. being on a ventilator
e. coagulopathy
MOST EFFECTIVE treatment for SRMD
H2 receptor antagonist gtt or PPI gtt
H. pylori infection can cause:
- GASTRITIS
- PUD
- GASTRIC ADENOCARCINOMA
- GASTRIC B-CELL (MALT) LYMPHOMA
who gets treated in chronic gastritis?
only SYMPTOMATIC patients
h/o gastric/duodenal ulcer, personal/family h/o gastric cancer, personal h/o MALT lymphoma
test for H. pylori when:
- h/o PUD
- EGD showing ulcer disease, erosive gastritis, or duodenitis
- MALT lymphoma
- family h/o gastric cancer
how is dyspepsia treated?
- discontinue NSAIDs
- test and treat if H. pylori +
- conduct PPI trial
- order EGD if alarm symptoms or PPI treatment failure
invasive tests for H. pylori
- EGD with biopsy= GOLD STANDARD
2. CLOtest and other rapid urease tests
noninvasive tests for H. pylori
- urea breath test (1st choice for treatment effectiveness)
- fecal antigen test (good for primary diagnosis)
- serologic test (not a good test)
what interferes with urease test (CLOtest)?
PPIs, stop for 2 weeks before
which test has poor PPV for H. pylori?
serologic tests
is H. pylori treatment different for gastritis or PUD?
no, it’s the SAME
H. pylori treatment
triple-drug therapy
O-CLAM (omeprazole 20mg + clarithromycin 500mg + amoxicillin 1G; all BID x 10-14 days)
should you test for H. pylori after treatment?
NOT recommended
in what situations do you test for H. pylori after treatment?
- h/o H. pylori-associated ulcer
- persistent dyspepsia despite test-and-treat strategy
- H. pylori MALT lymphoma
- resection of early gastric carcinoma
how soon should you test for H. pylori after treatment?
no sooner than 4 weeks
4 causes of peptic ulcer disease (PUD)
- Helicobacter pylori infection (MCC)
- NSAIDs
- high acid secreting states (Zollinger-Ellison)
- Crohn disease of duodenum/stomach
risk factors for NSAID-induced PUD
- first 3 months of use
- high doses
- elderly patient
- history of ulcer disease or prior UGIB
- cardiac disease
- concurrent steroid use
- serious illness
- concurrent ASA use
is smoking a risk factor for NSAID-induced PUD?
- exacerbates ulcer in gastric/duodenal ulcer disease
- decreases healing rate and increases recurrence/perforation rate in non-H. pylori ulcers
is ALCOHOL ulcerogenic?
NO
are CORTICOSTEROIDS alone ulcerogenic?
NO, but they DOUBLE the risk
may be 10-FOLD
how do you diagnose PUD in YOUNGER/HEALTHY PATIENTS?
- NO diagnosis needed; treat empirically (H2 blocker or PPI)
- or you can test and treat for H. pylori
how do you diagnose PUD in ALL OTHER PATIENTS?
EGD
especially with melena, heme + stool, early satiety, or IDA
you always do EGD in PUD w/u if:
- symptoms include dysphagia or odynophagia
- UGIB
- abnormal UGI (barium swallow) or CT scan
- family h/o duodenal ulcer disease
PERFORATED gastric or duodenal ulcers will show what on upright abdominal x-ray?
free air in peritoneal space
what are CONTRAINDICATED if a perforated ulcer is suspected?
EGD and UGI
pain of ulcer vs perforated ulcer
gnawing vs usually severe
treatment of PUD
- H. pylori treatment
- decrease acid secretion (H2 blockers, PPIs)
- stop exacerbating processes (smoking, NSAIDs)
when is sucralfate effective, but why is it not preferred?
- treatment of NON-H. pylori PUD
- has to be taken QID (PPI is once daily)
in which patient is sulcrafate the SHORT-TERM DOC?
renal patients, because it binds PO4, but shouldn’t be used long term because of aluminum accumulation and metabolic bone disease
when should you do surgery in PUD?
- UGI bleed (most common)- EGD can’t stop the bleed
- gastric outlet obstruction- initial treatment is balloon dilation
- perforation- laparoscopic repair
- recurrent/refractory ulcers- rare
- Zollinger-Ellison syndrome- remove underlying gastrinoma
MCC of duodenal ulcers
H. pylori and NSAIDs
only 1-3% d/t ZES
what’s better in preventing NSAID-induced ulcers?
PPIs and MISOPROSTOL
how long do you treat non-H. pylori gastric ulcers?
3 months
do gastric ulcers increase gastric cancer risk?
NO, but NONHEALING gastric ulcers should be scoped and biopsied to rule it out
leading cause of BLEEDING ulcers in the US?
NSAIDs
bleeding risk is DOSE-RELATED
NSAID-related ulcer risk is higher in…
females and any patient > 70 years of age
what type of NSAIDs have DECREASED GI SIDE EFFECTS?
COX-2 inhibitors (celecoxib, meloxicam)
signs of SEVERE peptic ulcer bleed/high risk of rebleed
- hemodynamic instability
- recurrent hematemesis or hematochezia
diagnostic and treatment procedure of choice for UGIB?
EGD
emergent EGD should be done in UGIB if?
- treat current bleed
2. assess risk for rebleed
EGD findings indicating INCREASED chance of rebleeding of ulcer?
- larger size of ulcer
- active bleeding during endoscopy
- visible vessels on non-bleeding ulcer
- visible clot
VERY LOW chance of ulcer rebleeding?
- NO BLEEDING
- NO CLOT
- NO VISIBLE VESSELS
what doesn’t stop bleeding peptic ulcers?
- gastric lavage
2. IV vasoconstrictors
- Osler-Weber-Rendu (hereditary hemorrhagic telangiectasia)- telangiectasias on skin, buccal/nasal mucosa, GIT, lungs, and brain
- Peutz-Jeghers syndrome (PJS)- dark melanin spots on lips, buccal mucosa, and hands and feet
2 non-ulcer causes of UGIB
GASTRINOMA, continuous gastrin production, refractory ulcers, and DIARRHEA +/- STEATORRHEA
Zollinger-Ellison syndrome
MC presentation of ZES?
diarrhea
initial w/u of ZES?
serum gastrin level (while off PPI therapy)
treatment of newly diagnosed ZES?
exploratory surgery with RESECTION OF PRIMARY TUMOR
DRUG OF CHOICE for ZES?
PPI
persistently high gastrin levels can cause?
gastric CARCINOIDS
gastric carcinoids are caused by?
CHRONIC HYPERGASTRINEMIC STATES
types of gastric carcinoids
- type 1 (70-80%)= AUTOIMMUNE GASTRITIS/PERNICIOUS ANEMIA
- type 2 ( 5%)= ZES as MEN1
- type 3 (30%)= SPONTANEOUS (most aggressive)
sometimes gastric carcinoids occur in?
patients with VITILIGO
do gastric carcinoids cause carcinoid syndrome?
yes, but ALMOST NEVER (they are very slow growing)
4 malignancies of stomach
- adenocarcinoma (MOST COMMON- 95%)
- carcinoids
- lymphoma
- GIST (gastrointestinal stromal tumors; e.g. leiomyosarcoma)
2 types of gastric adenocarcinoma
- PROXIMAL DIFFUSE
2. DISTAL INTESTINAL
DISTAL gastric cancer has strong association with?
ENVIRONMENTAL factors, especially:
- little fruits and vegetables, a lot of dried, smoked, and salted foods
- nitrates and nitrites
what is most often associated with GASTRIC CANCER?
ACANTHOSIS NIGRICANS
what don’t cause gastric cancer?
ALCOHOL nor GASTRIC ULCERS
diagnostic procedure of choice for nonhealing ulcer
endoscopy with multiple biopsies
should you use tumor markers, such as CEA and AFP, for gastric cancer?
NO, they are NOT USEFUL
treatment of gastric cancer
- remove cancer and adjacent LNs
- adjuvant combination chemoradiation
what are symptoms of dumping syndrome postprandial vasomotor?
PALPITATIONS, SWEATING, and LIGHTHEADNEDESS
2 types of dumping syndrome
- EARLY- occurs 30 minutes after eating (hyperosmolality of food and fluid shifts in small bowel)
- LATE- occurs 90 minutes after eating (probably d/t hypoglycemia)
treatment of dumping syndrome
- restrict sweets
- separate liquids and solids
- eat frequent small meals
- high protein
- complex carbohydrates
what is blind loop syndrome?
- BACTERIAL OVERGROWTH leading to FAT and B12 MALABSORPTION
- LOW D-XYLOSE ABSORPTION TEST
what is afferent loop syndrome?
- ABDOMINAL BLOATING and PAIN 20-60 minutes after eating
- vomiting relieves symptoms
gastroparesis
- delayed gastric emptying (early satiety)
- N/V/abdominal pain
gastroparesis in diabetics
highly VARIABLE gastric emptying
w/u for delayed gastric emptying
- RULE OUT obstruction first
- CONFIRM with radiolabeled solid meal (gastric emptying study)
metoclopramide FDA WARNING for LONG-TERM USE
extrapyradmidal side effects
can erythromycin be used for gastroparesis?
NOT VERY USEFUL (can be used acutely)
family members at increased risk of IBD and patient has increased risk of GI cancer in?
BOTH, Crohn disease (CD) and ulcerative colitis (UC),
but much higher in UC
complication in both CD and UC, and barium enema is CI in acute exacerbation
TOXIC MEGACOLON
more likely to get CD
SMOKERS
split by bacteria in COLON into MESALAMINE (active component) and SULFAPYRADINE
sulfasalazine
INEFFECTIVE for CD of SMALL BOWEL
sulfasalazine (because it won’t be split into active metabolite)
is the cause of adverse effects of sulfasalazine
SULFAPYRIDINE
treats perianal abscesses and fistulas in CD
metronidazole
enteric-coated corticosteroid with FEWER SYSTEMIC SIDE EFFECTS than prednisone, used for small bowel CD and colon (mild-to-moderate) UC
budesonide
PREDNISONE-SPARING, used in both CD and UC, take 3-4 MONTHS to show effect
6-mercaptopurine (6-MP) and azathioprine (metabolizes to 6-MP)
CD and UC treatment with bone marrow suppressive effects
6-mercaptopurine (6-MP) and azathioprine (metabolizes to 6-MP)
MONITOR CBC MONTHLY
- monoclonal antibodies to TNF-a
- given for MODERATE-TO-SEVERE CD, FISTULOUS CD, and REFRACTORY UC
infliximab
certolizumab pegol
adalimumab
infliximab, certolizumab pegol, adalimumab concerns:
TB REACTIVATION, but MOST COMMON side effect is URI
check for TB and hepatitis B
drugs proven to decrease relapse rate in CD
6-mercaptothioprine, azathioprine, methotrexate, and infliximab
- lesions: focal, SKIP, deep
- course: indolent
- less responsive to prednisone in acute flares
- granulomas are pathognomonic
- rectal sparing in 50%
- abscesses, fistulas
- small bowel involvement in > 50%
Crohn disease (CD)
- lesions: shallow, CONTINUOUS
- course: more acute
- very responsive to prednisone in acute flares
- NO granulomas
- rectum ALWAYS involved
- NO perianal disease
- backwash ileitis in
ulcerative colitis (UC)
drugs that decrease relapse in UC
ALL standard drugs
CD age of presentation
20’s or 30’s
but can be any age (70’s-80’s smaller peak)
long-term (> 8 years) CD should be screened how often for cancer?
every other year
common in patients with Crohn disease
osteoporosis (abnormal bone density, vitamin D deficiency d/t malabsorption, and/or steroids)
STRING SIGN
“string” of contrast going through lumen of terminal ileum in CD
if seen elsewhere in colon, it’s called APPLE-CORE lesion, suggests CANCER
serologic marker for UC
p-ANCA
serologic marker for CD
ASCA
extraintestinal manifestations of IBD usually seen in patients with?
COLITIS
- so usually associated with UC, but can be seen in CD that involves the colon
terminal ileum problems in CD usually NOT found in UC
- calcium oxalate kidney stones
- steatorrhea
- gallstones
- B12 deficiency
- hypocalcemia (from vitamin D malabsorption)
- bile acid-induced diarrhea
- nutrient malabsorption
CD gallstone type?
PIGMENT
when does B12 MALABSORPTION occur?
> 60cm terminal ileum resection
when does bile acid-induced diarrhea occur?
treatment for bile acid-induced diarrhea
BILE ACID SEQUESTRANTS (cholestyramine, colestipol)
when does steatorrhea occur?
d/t DECREASED proximal gut concentration of bile salts
> 100cm of distal ileum resection
treatment for steatorrhea in CD patients
LOW-FAT DIET
treatment for MILD CD with COLON disease only
5-ASA
treatment for FLARES of CD
prednisone
1st line drug for mild-to-moderate CD of ileum or ileocecal disease
budesonide
helpful with fistulas and getting off steroids
infliximab
can develop POSITIVE ANA, SEVERE FUNGAL INFECTION, LYMPHOMA, and MS from this CD medication
infliximab
incidence of RECURRENCE AFTER SURGERY in CD depends on what?
- site- ileocolic is highest
2. nature of complication- obstruction, perforation, and abscesses have higher rate of recurrence
treatment scenarios for CD:
COLON ONLY
sulfasalazine or mesalamine
treatment scenarios for CD:
ANY ILEUM or SMALL BOWEL
slow-release mesalamine
treatment scenarios for CD:
ONLY ILEUM or SMALL BOWEL
slow-release mesalamine or budesonide
treatment scenarios for CD:
FISTULA or PERIANAL
- infliximab (or other immunomodulators), metronidazole, or ciprofloxacin
- 6-MP also used
treatment scenarios for CD:
incomplete acute small bowel obstruction
corticosteroids
screen CD patients for?
OSTEOPOROSIS
inflammation ALWAYS starts in RECTUM, extends proximally, ALWAYS confined to COLON
ulcerative colitis (UC)
INFECTIOUS causes of colitis
- E. coli O157:H7 (EHEC)
- Shigella
- Salmonella
- Yersinia
- Campylobacter
- C. difficile
- E. histolytica (amebiasis)
how is UC diagnosed?
colonoscopy or sigmoidoscopy
UC patient that develops jaundice, itching and cholestatic LFTs
PRIMARY SCLEROSING CHOLANGITIS (PSC)
“JSEM” mnemonic
- Joints
- Skin
- Eyes
- Mouth
(this mnemonic leaves out primary sclerosing cholangitis; PSC)
PANcolitis for 8 YEARS or LEFT-SIDED colitis for 15 YEARS should have…
a colonoscopy every 1-2 years
treatment for UC?
CURED with SURGERY (but difficult to do)
for MILD DISEASE of UC, treatment
- sulfasalazine PO
- mesalamine PO
- rectal mesalamine
- hydrocortisone enema
for MODERATE-to-SEVERE DISEASE of UC, treatment
prednisone PO
treatment of fulminant UC
- hospitalize
- IV corticosteroids, infliximab, or cyclosporine
treatment of fulminant UC if symptoms persist for > 48 hours
colectomy
IBD buzzwords
tenesmus
UC
IBD buzzwords
rectal bleeding
UC
IBD buzzwords
fecal soiling
think fistula= CD
IBD buzzwords
hydronephrosis without stones
obstruction from inflammatory mass= CD
IBD buzzwords
pneumaturia
think fistula to the bladder= CD
definition of diarrhea
> 200-250 g/day of stool
normal average daily stool output
150-180 grams/day
diarrhea duration
- acute = 1 month
etiology of acute diarrhea
commonly INFECTIOUS
diagnosis of acute diarrhea
check diet and travel history
guaiac test and fecal WBCs
distinction between infectious diarrhea and IBD
BOTH can have crypt abscesses, but crypt distortions ONLY in IBD
treatment for INVASIVE diarrhea
- quinolones (especially ciprofloxacin)
- macrolides for Campylobacter (high quinolone resistance)
should you treat Salmonella with antibiotics?
NO, PROLONG infection
should you use antibiotics for E. coli O157:H7 (EHEC) infection?
NO! CONTRAINDICATED!
3 mechanisms of chronic diarrhea
OSMOTIC
SECRETORY
INCREASED MOTILITY
stool osmalality calculated=
2 x (stool [Na+] + stool [K+])
stool osmolar gap=
290 - stool osmolality calculated
SOG > 50
osmotic diarrhea
added osmoles are present causing diarrhea
SOG
normal stool, OR secretory diarrhea
in secretory diarrhea, patient is at risk of?
ELECTROLYTE DEFICIENCY (> 1L stool/day, meaning increased secretion of electrolytes)
does a 24-48-hour fast decrease secretory diarrhea?
NO, except in fatty acid- and bile acid-related diarrheas
does a 24-hour fast help with osmotic diarrhea?
YES
MOST COMMON cause of osmotic diarrhea
lactase deficiency
causes of dysmotility diarrhea
- antibiotics
- hyperthyroidism
- carcinoid
- irritable bowel syndrome
disease with both osmotic and secretory diarrhea
CELIAC disease
(malabsorption of carbohydrates= osmotic
malabsorption of fat= secretory)
disease with osmotic, secretory, and dysmotility
EXUDATIVE diarrhea
(inflammation= causes altered motility malabsorption= causes osmotic and secretory diarrhea)
diarrhea and weight loss in AIDS patient WITHOUT FEVER BUT HAS LOW CD4 COUNT, suspect
noninvasive organisms: Cryptosporidia (usual cause) E. histolytica Giardia Isospora Strongyloides AIDS enteropathy
diarrhea and weight loss in AIDS patient WITH FEVER, think
Mycobacterium Campylobacter Salmonella Cryptococcus Histoplasma CMV
VOLUME: > 1L diarrhea/day in AIDS patient
AIDS-associated diarrhea
chronic bloody stools, think
UC
chronic loose stools, chronic RLQ abdominal cramping, think
CD
with GI tumors, when does carcinoid syndrome occur?
ONLY when it metastasizes to the liver
PAROXYSMAL FLUSHING; crampy, explosive DIARRHEA; and HYPOTENSIVE TACHYCARDIA
carcinoid syndrome
can cause NIACIN DEFICIENCY (pellagra)
carcinoid syndrome
diagnosis of carcinoid
check 24-hour urine for 5-HIAA (5-hydroxyindoleacetic acid); > 25mg/d
microscopic colitis (both COLLAGENOUS and LYMPHOCYTIC colitis)
chronic secretory, watery diarrhea
normal colonoscopy, only seen on microscopic biopsy
diagnosis of chronic diarrhea
stage 1: labs
stage 2: more diagnostic tests
stage 3: EGD and colonoscopy
“BIG 6” blood tests for malabsorption
- albumin
- Ca++
- cholesterol
- carotene
- serum iron (all LOW)
- PT (PROLONGED)
2 subdivisions of malabsorption
- MUCOSAL TRANSPORT (something wrong with intestinal uptake)
- DIGESTION (not enough digestive enzymes)
what is celiac disease?
autoimmune gluten-sensitive enteropathy (small bowel villous atrophy and crypt hypertrophy causing malabsorption)
celiac disease can cause what in children?
GROWTH RETARDATION
deficiencies caused by celiac disease
iron folic acid calcium vitamin D vitamin B12 (rarely) vitamin K
dermatologic manifestation of celiac disease
dermatitis herpetiformis (vesicopapular rash)
4 diagnostic criteria of celiac disease
- evidence of malabsorption
- positive tissue transglutaminase Ab test OR antiendomysial Ab test
- positive response to gluten-free diet
- abnormal small bowel biopsy
treatment of celiac disease
LIFETIME GLUTEN-FREE DIET
what test to order in the following patient?
a 16-year-old presents with a diagnosis of bipolar disorder
tissue transglutaminase Ab or IgA antiendomysial Ab for celiac disease
what test to order in the following patient?
a 33-year-old presents with bone pain in his spine and legs
tissue transglutaminase Ab or IgA antiendomysial Ab for celiac disease
what test to order in the following patient?
a 28-year-old presents with a pruritic papulovesicular eruption on her extensor elbows and knees
tissue transglutaminase Ab or IgA antiendomysial Ab for celiac disease
what test to order in the following patient?
a 30-year-old presents with heme-negative stool and low Hb, MCV, and FERRITIN
tissue transglutaminase Ab or IgA antiendomysial Ab for celiac disease
what is tropical sprue?
malabsorption with partial villous atrophy
maybe caused by infectious organism
treatment of tropical sprue
tetracycline or doxycycline for 3-6 months
cause of whipple disease?
Tropheryma whipplei
cardinal tetrad of symptoms of whipple disease
- arthralgias (MOST COMMON symptom preceding diagnosis)
- abdominal pain
- weight loss
- diarrhea
diagnostic procedure of choice for whipple disease
EGD with small bowel biopsy
small bowel biopsy finding in whipple disease
FOAMY MACROPHAGES that are POSITIVE for PAS staining
treatment of whipple disease
- CEFTRIAXONE or IV PCN for 14 days
- THEN TMP/SMX FOR 1 YEAR
RELAPSE of whipple disease manifests with
CNS SYMPTOMS
short bowel syndrome happens when?
complications of short bowel syndrome
- CALCIUM OXALATE kidney stones (2/2 steatorrhea)
- gastric acid hypersecretion
treatment of short bowel syndrome
low-fat diet
small frequent meals
vitamin supplements
TPN if needed
eosinophilic gastroenteritis can mimic
INTESTINAL LYMPHOMA and REGIONAL ENTERITIS