Difference between revisions of "Crohn's disease"

(Text replacement - "5 mg" to "5mg")
(Background)
 
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***Reason why fistulas and abscesses are common complications
 
***Reason why fistulas and abscesses are common complications
 
**"Skip lesions" are common
 
**"Skip lesions" are common
 +
 +
{{Crohn's vs UC}}
  
 
==Clinical Features==
 
==Clinical Features==
 +
[[File:Aphthous stomatitis.jpg|thumb|An aphthous mouth ulcer ([[aphthous stomatitis]]) on seen with Crohn's disease.]]
 +
[[File:A single EN.jpg|thumb|A single lesion of erythema nodosum.]]
 
===GI Symptoms===
 
===GI Symptoms===
 
*[[Abdominal pain]]
 
*[[Abdominal pain]]
 
*[[Diarrhea]]
 
*[[Diarrhea]]
 
*Weight loss
 
*Weight loss
*Perianal fissures or fistulas
+
*[[Anal fissure|Perianal fissures]] or [[anal fistula|fistulas]]
  
 
===Extraintestinal Symptoms (50%)===
 
===Extraintestinal Symptoms (50%)===
 
*[[Arthritis]]
 
*[[Arthritis]]
**Peripheral arthritis
+
**Peripheral [[arthritis]]
 
***Migratory monoarticular or polyarticular
 
***Migratory monoarticular or polyarticular
**Ankylosing spondylitis
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**[[Ankylosing spondylitis]]
 
***Pain/stiffness of spine, hips, neck, rib cage
 
***Pain/stiffness of spine, hips, neck, rib cage
 
**Sacroiliitis
 
**Sacroiliitis
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**[[Erythema nodosum]]
 
**[[Erythema nodosum]]
 
***Painful, red, raised nodules on extensor surfaces of arms/legs
 
***Painful, red, raised nodules on extensor surfaces of arms/legs
**Pyoderma gangrenosum
+
**[[Pyoderma gangrenosum]]
***Violacious, ulcerative lesions with necrotic center found in pretibial region or trunk
+
***Violaceous, ulcerative lesions with necrotic center found in pretibial region or trunk
 
*Hepatobiliary
 
*Hepatobiliary
 
**[[Cholelithiasis]] (33%)
 
**[[Cholelithiasis]] (33%)
 
**Fatty liver
 
**Fatty liver
**Autoimmune hepatitis
+
**[[Autoimmune hepatitis]]
 
**[[Primary sclerosing cholangitis]]
 
**[[Primary sclerosing cholangitis]]
 
**Cholangiocarcinoma
 
**Cholangiocarcinoma
 +
*Renal
 +
**Increased risk for calcium oxalate [[nephrolithiasis|stones]] due to hyperoxaluria
 
*Vascular
 
*Vascular
 
**[[Thromboembolism]]
 
**[[Thromboembolism]]
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==Differential Diagnosis==
 
==Differential Diagnosis==
 
{{Colitis DDX}}
 
{{Colitis DDX}}
 +
===Other===
 +
*[[Appendicitis]]
  
==Diagnosis==
+
==Evaluation==
 
===Work-Up===
 
===Work-Up===
 +
*Rule out alternate etiologies for symptoms
 +
*Evaluate for complications (e.g. fistulae, abscess, obstruction)
 
*Labs
 
*Labs
 
**CBC
 
**CBC
 
**Chemistry
 
**Chemistry
 
**ESR/CRP
 
**ESR/CRP
**[[C.diff]] toxin
+
**Fecal calprotectin (sensitive indicator of intestinal inflammation, unreliable in select Crohn's patients)<ref>van Rheenen PF, Van de Vijver E, Fidler V. Faecal calprotectin for screening of patients with suspected inflammatory bowel disease: diagnostic meta-analysis. BMJ. 2010;15(341):c3369.</ref>
 +
**[[Clostridium difficile|C.diff]] toxin
 
**Type and screen if any bleeding suspicion
 
**Type and screen if any bleeding suspicion
*Imaging:
+
*Consider imaging:
 
**Plain abdominal films - rule out [[small bowel obstruction]], perforation and toxic megacolon
 
**Plain abdominal films - rule out [[small bowel obstruction]], perforation and toxic megacolon
 
**CT A/P
 
**CT A/P
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==Management==
 
==Management==
 +
[[File:CT scan gastric CD.jpg|thumb|CT scan showing Crohn's disease in the fundus of the stomach.]]
 
===Acute Flare Management===
 
===Acute Flare Management===
*IVF
+
*[[IVF]]
 
*Bowel rest
 
*Bowel rest
*Analgesia
+
*[[Analgesia]]
*Electrolyte correction
+
*[[Electrolyte repletion|Electrolyte correction]]
*Consider steroid burst
+
*Consider [[steroid]] burst
  
 
===Chronic Treatment===
 
===Chronic Treatment===
 
''Alterations should be discussed with GI''
 
''Alterations should be discussed with GI''
 
*Aminosalicylates (5-ASA) - Mild-to-moderate Crohn's disease. Give with probiotics.
 
*Aminosalicylates (5-ASA) - Mild-to-moderate Crohn's disease. Give with probiotics.
**Sulfasalazine 3-5gm/day PO (sulfa drug)
+
**[[Sulfasalazine]] 3-5gm/day PO (sulfa drug)
***Caution: Can cause folate deficiency so give with folic acid, and can cause hemolytic anemia in G6PD patients
+
***Caution: Can cause [[folate deficiency]] so give with [[folic acid]], and can cause [[hemolytic anemia]] in [[G6PD]] patients
**Mesalamine 4gm/day PO
+
**[[Mesalamine]] 4gm/day PO
 
***Active moiety of sulfasalazine, and formed from prodrug balsalazide
 
***Active moiety of sulfasalazine, and formed from prodrug balsalazide
 
**Balsalazide or Olsalazine - Bypasses small intestine to deliver drug into large intestine (better for UC)  
 
**Balsalazide or Olsalazine - Bypasses small intestine to deliver drug into large intestine (better for UC)  
 
*Anti-diarrheal - Use caution in patients with active inflammation as can precipitate toxic megacolon
 
*Anti-diarrheal - Use caution in patients with active inflammation as can precipitate toxic megacolon
 
**[[Loperamide]] 4-16mg/day
 
**[[Loperamide]] 4-16mg/day
**Diphenoxylate 5-20mg/day
+
**[[Diphenoxylate]] 5-20mg/day
 
**Cholestyramine 4g once to six times daily
 
**Cholestyramine 4g once to six times daily
*Glucocorticoids - Symptomatic relief (course not altered)
+
*[[Glucocorticoids]] - Symptomatic relief (course not altered)
 
**[[Prednisone]] - 40-60mg/day with taper once remission induced
 
**[[Prednisone]] - 40-60mg/day with taper once remission induced
 
**[[Methylprednisolone]] 20mg IV q6hr
 
**[[Methylprednisolone]] 20mg IV q6hr
 
**[[Hydrocortisone]] 100mg q8hr
 
**[[Hydrocortisone]] 100mg q8hr
***Do not start if any suspicion of infection (ie C.diff colitis)
+
***Do not start if any suspicion of infection (ie [[C. diff]] colitis)
 
***Double edge sword: Reduction of bone density in addition to underlying disease process(decreased Ca absorption)
 
***Double edge sword: Reduction of bone density in addition to underlying disease process(decreased Ca absorption)
 
*Antibiotics - Induce remission
 
*Antibiotics - Induce remission
**[[Ciprofloxacin]] 500mg q8-12hr OR
+
**[[Ciprofloxacin]] 500mg q8-12hr '''OR'''
**[[Metronidazole]] 500mg q6hr OR
+
**[[Metronidazole]] 500mg q6hr '''OR'''
 
**[[Rifaximin]] 800mg BID
 
**[[Rifaximin]] 800mg BID
 
*Immunomodulators - Steroid-sparing agents used in fistulas and patients with surgical contraindication. Slower onset.
 
*Immunomodulators - Steroid-sparing agents used in fistulas and patients with surgical contraindication. Slower onset.
 
**6-Mercaptopurine 1-1.5mg/kg/day → Start at 50mg daily
 
**6-Mercaptopurine 1-1.5mg/kg/day → Start at 50mg daily
**Azathioprine 2-2.5mg/kg/day → Start at 50mg daily
+
**[[Azathioprine]] 2-2.5mg/kg/day → Start at 50mg daily
 
**[[Methotrexate]] IM
 
**[[Methotrexate]] IM
 
*Anti-TNF - Medically resistant moderate-to-severe Crohn's disease
 
*Anti-TNF - Medically resistant moderate-to-severe Crohn's disease
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==Disposition==
 
==Disposition==
 
===Inpatient Admission===
 
===Inpatient Admission===
*Metabolic derangements (ie electrolyte imbalance or severe dehydration)
+
*Metabolic derangements (ie [[electrolyte imbalance]] or severe [[dehydration]])
*Fulminate colitis
+
*Fulminate [[colitis]]
*Obstruction
+
*[[SBO|Obstruction]]
*Peritonitis
+
*[[Peritonitis]]
*Significant hemorrhage
+
*Significant [[GI bleed|hemorrhage]]
  
 
===Surgical Intervention===
 
===Surgical Intervention===
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*Perforation
 
*Perforation
 
*Abscess/fistula formation
 
*Abscess/fistula formation
*Toxic megacolon
+
*[[Toxic megacolon]]
*Significant hemorrhage
+
*Significant [[GI bleed|hemorrhage]]
 
*Perianal disease
 
*Perianal disease
 
*Failed medical management
 
*Failed medical management
 +
  
 
==Complications==
 
==Complications==
*Obstruction
+
*[[Bowel obstruction]]
 
**Due to stricture or bowel wall edema
 
**Due to stricture or bowel wall edema
 
*Abscess
 
*Abscess
 
**Can be intraperitoneal, retroperitoneal, interloop, or intramesenteric
 
**Can be intraperitoneal, retroperitoneal, interloop, or intramesenteric
 
***More severe abdominal pain than usual
 
***More severe abdominal pain than usual
***Fever
+
***[[Fever]]
***Hip or back pain and difficulty walking (retroperitoneal abscess)
+
***[[hip pain|Hip]] or [[back pain]] and difficulty walking (retroperitoneal abscess)
 
*Fistula
 
*Fistula
 
**Occurs due to extension of intestinal fissure into adjacent structures
 
**Occurs due to extension of intestinal fissure into adjacent structures
 
**Suspect if changes in patient's symptoms (e.g. BM frequency, amt of pain, wt loss)
 
**Suspect if changes in patient's symptoms (e.g. BM frequency, amt of pain, wt loss)
 
*Perianal disease
 
*Perianal disease
**Abscess, fissures, fistulas, rectal prolapse
+
**[[perianal Abscess|Abscess]], [[anal fissure|fissures]], [[anal fistula|fistulas]], [[rectal prolapse]]
*Hemorrhage
+
*[[GI bleed|Hemorrhage]]
 
**Erosion into a bowel wall vesel
 
**Erosion into a bowel wall vesel
*Toxic megacolon
+
*[[Toxic megacolon]]
 
**Can be associated with massive GI bleeding
 
**Can be associated with massive GI bleeding
  
 
===Therapy complications===
 
===Therapy complications===
*Leukopenia /thrombocytopenia
+
*[[Leukopenia]]/[[thrombocytopenia]]
*Fever / infection
+
*[[Fever]]/infection
*Pancreatitis
+
*[[Pancreatitis]]
*Renal / liver failure
+
*[[Renal failure|Renal]]/[[liver failure]]
  
 
==See Also==
 
==See Also==
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==References==
 
==References==
 
+
<references/>
 
[[Category:GI]]
 
[[Category:GI]]

Latest revision as of 21:17, 7 July 2021

Background

  • Can involve any part of the GI tract from the mouth to the anus
  • Bimodal distribution: 15-22yr, 55-60yr
  • Pathology
    • All layers of the bowel are involved
      • Reason why fistulas and abscesses are common complications
    • "Skip lesions" are common

Crohn's disease vs. ulcerative colitis

Finding Crohn's disease Ulcerative colitis
Depth of inflammation May be transmural, deep into tissues Shallow, mucosal
Distribution of disease Patchy areas of inflammation (skip lesions) Continuous area of inflammation
Terminal ileum involvement Commonly Seldom
Colon involvement Usually Always
Rectum involvement Seldom Usually (95%)
Involvement around anus Common Seldom
Stenosis Common Seldom

Clinical Features

An aphthous mouth ulcer (aphthous stomatitis) on seen with Crohn's disease.
A single lesion of erythema nodosum.

GI Symptoms

Extraintestinal Symptoms (50%)

Differential Diagnosis

Colitis

Other

Evaluation

Work-Up

  • Rule out alternate etiologies for symptoms
  • Evaluate for complications (e.g. fistulae, abscess, obstruction)
  • Labs
    • CBC
    • Chemistry
    • ESR/CRP
    • Fecal calprotectin (sensitive indicator of intestinal inflammation, unreliable in select Crohn's patients)[1]
    • C.diff toxin
    • Type and screen if any bleeding suspicion
  • Consider imaging:
    • Plain abdominal films - rule out small bowel obstruction, perforation and toxic megacolon
    • CT A/P
      • Most useful diagnostic test in patients with acute symptoms who have known or suspected Crohn
      • Findings: bowel wall thickening, mesenteric edema, local abscess, fistulas

Management

CT scan showing Crohn's disease in the fundus of the stomach.

Acute Flare Management

Chronic Treatment

Alterations should be discussed with GI

  • Aminosalicylates (5-ASA) - Mild-to-moderate Crohn's disease. Give with probiotics.
  • Anti-diarrheal - Use caution in patients with active inflammation as can precipitate toxic megacolon
  • Glucocorticoids - Symptomatic relief (course not altered)
    • Prednisone - 40-60mg/day with taper once remission induced
    • Methylprednisolone 20mg IV q6hr
    • Hydrocortisone 100mg q8hr
      • Do not start if any suspicion of infection (ie C. diff colitis)
      • Double edge sword: Reduction of bone density in addition to underlying disease process(decreased Ca absorption)
  • Antibiotics - Induce remission
  • Immunomodulators - Steroid-sparing agents used in fistulas and patients with surgical contraindication. Slower onset.
    • 6-Mercaptopurine 1-1.5mg/kg/day → Start at 50mg daily
    • Azathioprine 2-2.5mg/kg/day → Start at 50mg daily
    • Methotrexate IM
  • Anti-TNF - Medically resistant moderate-to-severe Crohn's disease
    • Infliximab (Remicade) 5mg/kg IV
    • Adalimumab (Humira), Natalizumab or certolizumab pegol can also be used

Disposition

Inpatient Admission

Surgical Intervention

Consult EARLY if any of the following suspicions


Complications

  • Bowel obstruction
    • Due to stricture or bowel wall edema
  • Abscess
    • Can be intraperitoneal, retroperitoneal, interloop, or intramesenteric
      • More severe abdominal pain than usual
      • Fever
      • Hip or back pain and difficulty walking (retroperitoneal abscess)
  • Fistula
    • Occurs due to extension of intestinal fissure into adjacent structures
    • Suspect if changes in patient's symptoms (e.g. BM frequency, amt of pain, wt loss)
  • Perianal disease
  • Hemorrhage
    • Erosion into a bowel wall vesel
  • Toxic megacolon
    • Can be associated with massive GI bleeding

Therapy complications

See Also

References

  1. van Rheenen PF, Van de Vijver E, Fidler V. Faecal calprotectin for screening of patients with suspected inflammatory bowel disease: diagnostic meta-analysis. BMJ. 2010;15(341):c3369.