Ischemic colitis differential diagnosis

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-In-Chief: Cafer Zorkun, M.D., Ph.D. [2]

Overview

• Ischemic colitis must be differentiated from the many other causes of abdominal pain and rectal bleeding (for example, infection, inflammatory bowel disease, diverticulosis, or colon cancer).

• It is also important to differentiate ischemic colitis, which often resolves on its own, from the more immediately life-threatening condition of acute mesenteric ischemia of the small bowel.

• The symptoms of colitis such as diarrhea, especially bloody diarrhea, and abdominal pain are seen are seen in all forms of colitis. The table below lists the differential diagnosis of common causes of colitis:

Diseases	History and Symptoms				Physical Examination				Laboratory findings
	Diarrhea	Rectal bleeding	Abdominal pain	Atopy	Dehydration	Fever	Hypotension	Malnutrition	Blood in stool (frank or occult)	Microorganism in stool	Pseudomembranes on endoscopy
Allergic Colitis	+	++	+	++					++
Chemical colitis	+	++	++		+	+			++		+
Infectious colitis	++	++	++		+++	+++	++	+	++	++	+
Radiation colitis	+	++	+		+			+	++
Ischemic colitis	+	+	++		+	+	+	+	++
Drug-induced colitis	+	+	++			+			++		+

Classification of acute abdomen based on etiology Presentation Symptoms Signs Diagnosis Comments Fever Abdominal Pain Jaundice Guarding Rebound Tenderness Bowel sounds Lab Findings Imaging Common causes of Peritonitis Primary Peritonitis Spontaneous bacterial peritonitis + Diffuse - - - Hypoactive Ascitic fluid PMN>250 cells/mm³ Culture: Positive for single organism Ultrasound for evaluation of liver cirrhosis - Secondary Peritonitis Perforated gastric and duodenal ulcer + Diffuse - + + N Ascitic fluid LDH > serum LDH Glucose < 50mg/dl Total protein > 1g/dl Air under diaphragm in upright CXR Upper GI endoscopy for diagnosis Acute cholangitis + RUQ + - - N Abnormal LFT Ultrasound shows biliary dilatation Biliary drainage (ERCP) + IV antibiotics Acute cholecystitis + RUQ + - - Hypoactive Hyperbilirubinemia Leukocytosis Ultrasound shows gallstone and evidence of inflammation Murphy’s sign Acute pancreatitis + Epigastric +/- - - N Increased amylase / lipase Ultrasound shows evidence of inflammation Pain radiation to back Acute appendicitis + RLQ - + + Hypoactive Leukocytosis Ultrasound shows evidence of inflammation Nausea & vomiting, decreased appetite Acute diverticulitis + LLQ +/- + - Hypoactive Leukocytosis CT scan and ultrasound shows evidence of inflammation Acute salpingitis + LLQ/ RLQ - +/- +/- N Leukocytosis Pelvic ultrasound Vaginal discharge Hollow Viscous Obstruction Small intestine obstruction - Diffuse - + +/- Hyperactive then absent Leukocytosis Abdominal X ray Nausea & vomiting associated with constipation, abdominal distention Volvulus - Diffuse - + - Hypoactive Leukocytosis CT scan and abdominal X ray Nausea & vomiting associated with constipation, abdominal distention Biliary colic - RUQ + - - N Increased bilirubin and alkaline phosphatase Ultrasound Nausea & vomiting Renal colic - Flank pain - - - N Hematuria CT scan and ultrasound Colicky abdominal pain associated with nausea & vomiting Vascular Disorders Ischemic causes Mesenteric ischemia +/- Periumbilical - - - Hyperactive Leukocytosis and lactic acidosis CT scan Nausea & vomiting, normal physical examination Acute ischemic colitis +/- Diffuse - + + Hyperactive then absent Leukocytosis CT scan Nausea & vomiting Hemorrhagic causes Ruptured abdominal aortic aneurysm - Diffuse - - - N Normal CT scan Unstable hemodynamics Intra-abdominal or retroperitoneal hemorrhage - Diffuse - - - N Anemia CT scan History of trauma Gynaecological Causes Ovarian Cyst Complications Torsion of the cyst - RLQ / LLQ - +/- +/- N Increased ESR and CRP Ultrasound Sudden onset sever pain with nausea and vomiting Cyst rupture - RLQ / LLQ - +/- +/- N Increased ESR and CRP Ultrasound Sudden onset sever pain with nausea and vomiting Pregnancy Ruptured ectopic pregnancy - RLQ / LLQ - - - N Positive pregnancy test Ultrasound History of missed period and vaginal bleeding References Template:WikiDoc Sources