GI Flashcards
Associations with PPI
HypoMg Low B12 C.diff Pneumonia AIN Dementia CKD Low BMD Gastric CA
Treatment Barrett’s Esophagus
Dysplastic: Endoscopic eradication + PPI
Non-dysplastic: PPI OD, rpt OGD 3-5 years
Dysphagia alarm symptoms (warrants OGD)
Weight loss, Anemia Hematemesis/Melena Onset >age 50 Emesis Odynophagia Persistent dysphagia despite PPI BID
*No alarm sx and <50yo + GERD –> PPI trial
Diagnostic Test for Achalasia
- EGD to r/o pseudo-achalasia aka obstruction from Ca; narrow GEJ with dilated esophagus
- Manometry (gold standard - shows impaired relaxation or abnormal peristalsis) > barium swallow (shows bird beak)
Treatment Achalasia
Good surgical candidate:
- Pneumatic dilatation (type 1+2) - risk of tear
- Laparascopic heller myotomy +/- fundoplication
- POEM (peroral endoscopic myotomy)
- Esophagectomy - if failed above or sigmoid- or mega - esophagus
Poor OR candidate: Endoscopic botox > CCB/ nitrates eg nifedipine or ISDN
Risk factors for eosinophilic esophagitis
Male
Young (20-30)
Allergy/Atopy, Eczema, Asthma
Chronic rhinitis
Secondary causes of eosinophilic esophagitis
Pill esophagitis CTD Hypermobility syndromes HyperIgE syndrome Pemphigus Untx Achalsia Untx GERD
Treatment eosinophilic esophagitis
- 6 food elimination diet (eggs, soy, cow’s milk, wheat, tree nuts, seafood)
- 1st line = Topical swallowed steroid (fluticasone, budesonide)
- 2nd line = pred
- Consider dilation if symptomatic strictures
Complications of celiac disease
Malnutrition: weight loss, vitamin and mineral deficiency: Fe/B12 (anemia), Ca/vit D (osteoporosis),
Mild transaminitis
Dermatitis Herpetiformis (Dapsone after r/o G6PD)
Enteropathy associated T-cell lymphoma (consider if pt stops responding to gluten fee diet)
Celiac disease: Work-up
If high prob: OGD with duod bx + anti-TTG IgA +/- IgA
If low prob: 1st Anti-TTG IgA +/- IgA
- If high TTG IgA –> OGD with bx
- If normal TTG IgA and low serum IgA –> TTG IgG –> If positive proceed to OGD with bx
- If normal TTG IgA and normal IgA –> no celiac
If Bx + Anti-TTG IgA (or IgG if IgA deficient) + = CD
If both neg = no celiac
If Bx + TTG discordant-> HLADQ2/DQ8 to r/i or r/o
Indications to order HLA DQ2/DQ8 for Celiac Disease
Discordant biopsy and anti-TTG
Patient unable to comply with gluten-rich diet x3 months
Down Syndrome
Foods included in gluten free diet
BROW
Barley
Rye
Oats
Wheat
Pathology in Crohn’s vs UC
Crohn’s: Gum to bum (MC small bowel, ileocolitis, colonic)
Transmural inflammation, non-caseating
Skip lesions “cobblestone mucosa”
Strictures, Fistulas, clubbing
UC: Extends from rectum proximally
Submucosal/mucosal inflammation
Crypt distortion/atrophy/abscess
Contiguous, rare clubbing
Complications in Crohn’s vs UC
Crohn’s:
- Fistulas (intra-abdo, perianal)
- Abscess (intra-abdo, perianal)
- Strictures (cold/hot) and obstruction
- Peri-anal disease
- CRC
UC:
- Toxic megacolon
- Colonic perforation
- Refractory bleeding
- CRC
- Cholangiocarcinoma
- PSC
Induction Treatment Crohn’s Disease
Mild-Mod: Budesonide (if terminal ileum +/- R colon), Pred (colon only). **No role for 5ASA or thioprine
Mod-Severe:
- Prednisone/Methylpred 40-60/d if low risk
- Anti-TNF + AZA or MTX +/- Pred/Methylpred if high risk (if already failed anti-TNF, vedolizumab or ustekinumab acceptable)
- always start TNFi with thioprine
- check TMPT before starting AZA/6MP
Induction Treatment UC
Mild: Budesonide or 5-ASA (PO if extensive, PR enema if left sided colitis - sigmoid to splenic flexture, PR supp if proctitis <18cm)
Mod-Severe: Budesonide or Pred/Methylpred or anti-TNF (vedolizumab, ustekinumab, TNFi, JAK-2i acceptable if failed TNF)
Maintenance Treatment Crohn’s Disease
Mild-Moderate: Thioprine
Moderate-Severe: - Thioprine - MTX - Anti-TNF (with Aza or MTX) - *esp if fistulas - Anti-integrin (Vedolizumab) - AntiIL12/23 (Ustekinumab) NO JAKi (ONLY UC)
Maintenance Treatment UC
Mild: 5-ASA (PO/PR enema/PR sup)
Moderate-Severe:
- 5-ASA
- Azathioprine or 6-MP
- Anti-TNF (with Aza or MTX)
- Anti-integrin (Vedolizumab)
- AntiIL12/23 (Ustekinumab)
- JAK-2 inhibitor (Tofacitinib, Barocitinib)
Treatment Crohn’s Disease Complications
- If fever - always R/O infxn with Cx +/- MRE/CTE (intra-abdo abscess) +/- EUS/MRI pelvis (perianal abscess)
- Perianal fistula: Anti-TNF + Thioprine/MTX (+surgery if intraabdo)
- Perianal Abscess: I&D (or surg if intraabdo) + Cipro/flagyl
- Cold Stricture: Conservative tx +/- endo dilatation/surgery
- Hot Stricture: Steroid induction –> biologic maintenance
Classifying UC Severity
Mild: <4BMs/day Intermittent blood only Normal Hgb ESR <30
Severe: Vitals: T>37.8C, HR >90 >6BMs/day Frequent blood Low Hgb (<105) ESR >30 Dehydration requiring hospitalization
Definition Toxic Megacolon in UC
- Megacolon > 6cm +
- > =3 of: Fever >38, HR >120, Anemia, Neuts >10.5 +
- > =1 of: Dehydration, Lyte abn, hypotension, altered LOC
UC: Indications for colectomy
- Toxic megacolon
- Severe bleeding
- Perforation
- Flare refractory to medical tx x3-5 days
Diagnostic tests for H. Pylori
Biopsy histology
Biopsy culture
Stool Ag
Urea breath test
*Serology does not differentiate current vs prior infxn
Treatment H. Pylori
1st Line: PBMT x 14 days = PPI + Bismuth + Metronidazole + Tetracycline
OR
PAMC x 14 days = PPI + Amox + Metronidazole + Clarithro
Treatment failure: PBMT (if prior triple therapy) or PAL x14d (PPI/Amox/Levo)
*Urea breath test, biopsy, or stool Ag (NOT serology) >4 weeks post completion of tx
DDX Lower GI Bleed
Painless: Diverticular, hemorrhoids, polyp, CA, angiodysplasia, radiation proctitis or colitis, (IBD, infectious)
Painful: Ischemic colitis (low flow, atherosclerotic), Mesenteric (cardioembolic), thrombosed hemorrhoid, fissure, (IBD, infxn)
DDX Hepatocellular transaminitis in 1000s
Acetaminophen AI Hepatitis Viral hepatitis (A, B, D, E) Ischemic hepatitis (Shock liver, Budd Chiari) Acute Stone w/i 24h Wilson's (rare)
DDX Hepatocellular transaminitis in 100s
Alcohol (AST/ALT >2; unlikely if LE >300)
Drugs (tyl, MTX, anti-thyroid, ABX)
Viral (Hep B, C, EBV, CMV)
DDX Hepatocellular transaminitis <100
NASH Celiac Hemochromatosis Wilsons A1AT Drugs
DDX Cholestatic Transaminitis
Extra-hepatic:
- Stone
- PSC stricture
- Benign obstruction (IgG4/AIP, AIDS cholangiopathy)
- Malignant obstruction (pancreatic CA, cholangioCA)
Intra-hepatic:
- PBC
- Drugs (ABX, TPN, Estrogen, MTX)
- IHCP
- Hepatic infiltration
- Infection
Hepatitis B Serology: Immune from past infection
SAg - , SAb + , cIgM -, cIgG + , EAg - , EAb + , DNA neg
Hep B Serology: Immune from vaccine
SAg - , SAb +, cIgM - , cIgG -, EAg -, EAb - , DNA neg
Hep B Serology: Window Period
SAg- , SAb - , cIgM + , cIgG -, EAg +/- , EAb -/+, DNA neg
Hep B Serology: Acute infection
SAg+, SAb -, cIgM +, cIgG +/-, EAg +, EAb - , DNA pos
Hep B Serology: Chronic Infection (<5% with HepB) - 4 categories
1) EAg + chronic infection (Immune Tolerant):
SAg+, SAb-, cIgM-, cIgG +, EAg +, EAb -, DNA >1 mill
ALT normal, no fibrosis on biopsy or fibroscan
2) EAg + chronic hepatitis (Immune active):
SAg+, SAb-, cIgM-, cIgG +, EAg +, EAb -, DNA> 20,000
ALT elevated (>2x ULN), mod-sev inflmn/fibrosis on bx or fibroscan
3) EAg - chronic infection (inactive carrier):
SAg+, SAb-, cIgM-, cIgG +, EAg -, EAb +, DNA <2000
ALT normal, minimal fibrosis/inflmn on bx or fibroscan
4) EAg - chronic hepatitis (immune reactivation):
SAg+, SAb-, cIgM-, cIgG +, EAg -, EAb +, DNA >2000
ALT elevated, fibrosis/inflmn on bx or fibroscan
HepB Antiviral Treatment: Indications
Acute: Only if progressive liver failure
Chronic: (goal convert sAg and EAg –> Ab, dec DNA lvl and risk cirrhosis/HCC)
- Immune active: EAg+, ALT >2x ULN, + DNA >20,000
- Immune reactivation: EAg -, ALT >2x ULN, + DNA >2000
- Cirrhosis
- Fibrosis >stage1 with DNA>2000 regardless of ALT or HbeAg
- Extra-hepatic manifestations
- Pregnant (24-32wk) if DNA >200,000 (to dec fetal transmission) - use Tenofovir and give baby HBIG + HBV vaccine
HepB Antiviral Treatment
1st line: Nucleoside analogues (Tenofovir, entecavir, lamivudine) Peg interferon (finite = 48w, ++side fx) - for low DNA, high ALT and noncirrhotic HbeAg+. NOT for decompensated cirrhotics
Hep B followup screening
Q6mo ALT + HBV DNA q6-12mo for all
US q6mo for HCC if: All Cirrhotics Asian M>40, F>50 African American >20 HIV or Hep D Co-infection FHX HCC (1st deg)
*NO AFP screening
HepB: Extra-hepatic manifestations
Rheum: PAN
Renal: membranous nephropathy > MPGN
Haem: aplastic anemia