GI Flashcards
A neuroendocrine tumor that arises from the beta cells of the pancreas is what?
Insulinoma
Patient has weight gain and continual hypoglycemia and gets better after given glucose
Insulinoma
Whipples triad?
Plasma glucose concentration ≤ 55 mg/dL
Signs or symptoms consistent with hypoglycemia
Resolution when plasma glucose increases
Seen in pts. with insulinoma
Diagnostic indications of insulinoma
Hypoglycemia with inappropriately high insulin levels (hyperinsulinism)
Fasting test: Positive if serum glucose levels remain low (< 40 mg/dL) and insulin levels remain high even after fasting for 72 hours.
↑ C-peptide and ↑ proinsulin levels
How to differentiate sulfonylurea use from insulinoma
Elevated C-peptide and proinsulin levels may also be the result of sulfonylurea use! This can be ruled out by screening serum samples for sulfonylureas.
Tx of insulinoma
surgery
Medication–> diazoxide which inhibits insulin release
IBD that involves terminal ileum?
Crohn’s
Mimics appendicitis
Fe deficiency
IBD that is continuous that involves rectum?
UC
IBD increasing risk for Primary Sclerosing Cholangitis?
UC
IBD most likely to have fistula forming?
Crohn’s
Metronidazole
IBD most likely to granulomas on biopsy?
Crohn’s
UC is cured by what?
Colectomy
IBD where smokers have a lower risk?
UC
smokers have higher risk for Crohn’s
IBD that has highest risk of colon cancer?
UC
IBD associated w/ p-ANCA?
UC
Treatment for IBD?
ASA, sulfasalzine to maintain remission, Corticosteroids to induce remission
For Crohns give metronidazole for any ulcer abscess
Give Azathioprine, 6MP, and methotrexate for severe dz
LFT Buzzwords
• AST>ALT (2x) + high GGT
Alcoholic Hepatitis
LFT Buzzwords
ALT>AST & in the 1000s
Viral Hepatitis
LFT Buzzwords
AST and ALT in the 1000s after surgery or hemorrhage
Ischemic Hepatitis (“shock liver”)
LFT Buzzwords
Elevated Direct bilirubin
Obstructive (stone/cancer) or Dubin’s Johnsons, Rotor
LFT Buzzwords
Elevated Indirect bilirubin
Hemolysis or Gilbert’s, Crigler Najjar
LFT Buzzwords
Elevated alk phos and GGT
Bile duct obstruction, if IBD –> PSC
LFT Buzzwords
Elevated alk phos, normal GGT, normal Ca
Paget’s disease (incr hat size, hearing loss,
HA. Tx w/ bisphosphonates.
AMA- antibodies
antimitochondrial Ab
Primary Biliary Cirrhosis – tx w/ bile resins
ANA + antismooth muscle Ab
Autoimmune Hepatitis- tx w/ steroids
High Fe, low ferritin, low Fe binding capacity
Hemachromatosis- hepatitis, DM, golden skin
Low ceruloplasmin, high urinary Cu
Wilson’s-
hepatitis, psychiatric sxs (BG), corneal deposits
Unconjugated hyperbilirubinemia–> Increased hgb breakdown
Hemolysis; glucose-6-phosphate dehydrogenase deficiency, sickle cell anemia, spherocytosis, hemolytic disease of the fetus and newborn, and blood transfusions
thalassemia
Unconjugated hyperbilirubinemia–> Impaired hepatic uptake of bilirubin
Drugs (e.g., rifampin, probenecid, sulfonamides)
Conjugated hyperbilirubinemia–> Intrahepatic cholestasis
Primary biliary cholangitis
Pregnancy
Conjugated hyperbilirubinemia–> Extrahepatic cholestasis
Choledocholithiasis
pancreatic cancer, cholangiocellular carcinoma
primary sclerosing cholangitis
Malformations of the bile ducts; biliary cysts
Postoperative bile leaks or biliary duct strictures
Common causes of hyperbilirubinemia
HOT Liver: Hemolysis, Obstruction, Tumor, and Liver disease!
Clinical Features of jaundice
Pale, clay-colored (acholic) stool
Darkening of urine
Pruritus
Fat malabsorption (steatorrhea, weight loss)
Who do Primary Biliary cholangitis usually affect?
Middle aged women
45 yo female presents with fatigue of 2 months duration, 1 month of RUQ dull pain, dry mouth and has noticed darker patches on her body what is it?
PBC
Labs that are significant in PBC?
elevated AMA ab, ANA, ALP
AST/ALT will be normal or slightly elevated
What is the tx for PBC?
Ursodeoxycholic acid/urosdiol
PSC is associated with what?
UC
PSC is associated with what antibodies
pANCA
What diagnostic imaging should be used for dx PSC?
MRCP
magnetic resonance cholangiopancreatography
40 yo male with chronic IBD comes in complaining of abdominal pain on the right side and itchiness, has elevated ALP, GGT, and conjugated bilirubin what is the most likely diagnosis?
PSC
Who does PSC affect vs PBC?
PSC affects middle aged men while PBC affects middle aged women
What is the main difference in the pathophysio between PSC and PBC?
PSC affects intrahepatic and extrahepatic ducts
PBC affects intrahepatic ducts
PBC is associated with what conditions?
Autoimmune conditions, such as RA, CREST syndrome, Sicca syndrome, autoimmune thyroid disease
Symptomatic treatment for PSC?
Ursodeoxycholic acid
Curative treatment for PSC?
Liver transplantation
Major complication of PSC?
Cholangiocarcinoma
The presence of gallstones in the gallbladder?
Cholelithiasis
The presence of gallstones in common bile duct
Choledocholithiasis
Inflammation of the gallbladder
Cholecystitis
Bacterial infection of the biliary tract?
Cholangitis
Cholelithiasis pathophys
Bile cholesterol oversaturation, bile stasis, impaired bile acid circulation → precipitation of gallstones in the gallbladder
Choledocholithiasis
Cholelithiasis → migration of gallstones into the common bile duct
Acute cholecystitis
Cholelithiasis (most common) or biliary sludge → inflammation of gallbladder wall
Acute cholangitis
Choledocholithiasis → obstruction and stasis within the biliary tract → subsequent bacterial infection
Cholelithiasis clinical features
RUQ pain less than 6h
biliary colic especially postprandial
Choledocholithiasis clinical features
colicky RUQ pain more than 6h
postprandial
Nausea vomiting
Acute cholecystitis
clinical features
RUQ pain (postprandial)
Fever
Murphy sign
Murphy sign
The act of the patient suddenly pausing during inspiration upon deep palpation of the right upper quadrant due to pain. A strong indicator of cholecystitis.
Charcot triad
RUQ pain
Fever
Jaundice
Acute cholangitis clinical features
Charcot triad or Reynold Pentad
Reynold pentad
Charcot cholangitis triad PLUS hypotension and mental status changes
Cholelithiasis lab findings
Normal
Choledocholithiasis lab findings
elevated ALP, AST, ALT and total bilirubin
Acute cholecystitis lab findings
elevated WBC, CRP
Acute cholangitis lab findings
elevated WBC, CRP, ALP, AST, ALT and total bilirubin
Cholelithiasis dx test and findings
US: gallstones with posterior acoustic shadow
Cholelithiasis treatment
Supportive care NSAIDs,
elective cck
Choledocholithiasis dx test and findings
US: dilated common bile duct, intrahepatic biliary dilatation
MRCP or ERCP: filling defect in the contrast-enhanced duct
Choledocholithiasis treatment
Supportive care NSAIDs,
Endoscopic stone retrieval (ERCP)
Elective cholecystectomy
Acute cholecystitis dx test and findings
US: gallbladder wall thickening and/or edema (double wall sign)
HIDA scan if diagnosis uncertain
Acute cholecystitis treatment
Supportive care, analgesics
IV antibiotics
Cholecystectomy (timing depends on severity)
Acute cholangitis dx test and findings
US: biliary dilation and/or evidence of obstruction (e.g., cholelithiasis)
MRCP if diagnosis uncertain
If high suspicion go directly to diagnostic and therapeutic ERCP
Acute cholangitis treatment
Supportive care, analgesics
IV antibiotics
Urgent biliary drainage and decompression via ERCP
Interval cholecystectomy if gallstones are present or concurrent cholecystitis
Risk factors for cholelithiasis
female forty, fat, fertile, fair skinned, family history
Why is x-ray rarely diagnostic for cholelithiasis?
X-ray is rarely diagnostic because only 10–15% of stones (i.e., pigment stones) are radiopaque. Cholesterol stones (majority) are radiolucent!
Mirizzi syndrome
complication of cholelithaisis
Gallstones in the cystic duct or Hartmann pouch of the gallbladder obstruct the common hepatic duct or common bile duct.
Complications of Choledocholithiasis ?
gallstone ileus
gallstone pancreatitis
Gallstone ileus
mechanical ileus due to obstructive gallstones
perforation and fistula formation between the inflamed gallbladder and bowel → gallstones pass down into bowel lumen
clinical features: abdominal pain and distention, nausea, vomiting
Sign: pneumobilia
pneumobilia
The accumulation of gas in the biliary system. Common causes include sphincterotomy of the sphincter of Oddi, biliary-enteric anastomosis, and gallstone ileus.
Bacterial infection most common Acute cholecystitis ?
E. coli, Klebsiella, Enterobacter, Enterococcus spp.
Emphysematous cholecystitis (rare)
most often in elderly diabetic men
infection of the gallbladder with gas-forming bacteria (e.g., Clostridium welchii)
Ultrasound or CT demonstrates air in the gallbladder wall or lumen.
Treatment: emergent cholecystectomy
Complications of acute cholecystitis
Gallbladder empyema
gallbladder perforation
chronic cholecystitis
Porcelain gallbladder
complication of chronic cholecystitis
fibrotic and calcified gallbladder due to chronic inflammation
Chronic gallbladder inflammation increases the risk of what?
gallbladder carcinoma