Snapshot A 73-year-old woman presents with severe abdominal pain and a recent history of passing bloody stools. The pain began about 3 days ago and is more concentrated at the left side of the abdomen. Physical examination shows decreased-to-absent bowel sounds, abdominal distention, and diffuse tenderness to palpation over her abdomen. A barium-enema study is performed which shows "thumb-printing" of the colon. Introduction Clinical definition medical condition characterized by inadequate blood supply to the large intestine leading to inflammation and injury of the colon Epidemiology demographics more common in the elderly population most common form of bowel ischemia risk factors aortoiliac surgery/instrumentation myocardial infarction hemodialysis hypercoagulable states (e.g., hereditary thrombophilia) Pathogenesis ischemic colitis is the result of blood flow reduction to the colon and is particularly prominent at the “watershed” areas of the colon where collateral blood flow is limited the splenic flexure and rectosigmoid junction are particularly at risk for ischemia nonocclusive colonic ischemia accounts for the mass majority of cases (95%) typically transient hypoperfusion examples include shock, systemic hypotension or atherosclerosis of SMA occlusive colonic ischemia can be embolic (e.g., spontaneous or iatrogenic) or thrombotic secondary to atherosclerotic disease mesenteric vein thrombosis extremely rare and usually involves the small intestine Presentation Symptoms mild cramping abdominal pain commonly involving the left side less severe compared to mesenteric ischemia hematochezia usually follows within 24 hours after abdominal pain diarrhea vomiting Physical exam fever abdominal tenderness weight loss Imaging Abdominal radiograph usually normal but may be useful in excluding other causes of abdominal pain may also identify complications of mesenteric ischemia (e.g., necrosis) Computed tomography (CT) without oral contrast best initial test may see bowel wall thickening in a segmental pattern (thumbprinting), bowel dilation, mesenteric stranding, or intestinal pneumatosis Endoscopic evaluation can be done via colonoscopy for flexible sigmoidoscopy allows for biopsy of suspicious areas positive findings include edematous, friable mucosa, erythema, and interspersed pale areas Studies Laboratory studies leukocytosis elevated lactate metabolic acidosis Differential Mesenteric ischemia differentiating factors commonly presents with severe abdominal pain and does not accompany hematochezia Colonic malignancy differentiating factors will appear differently on endoscopy and abdominal CT Treatment Management approach treatment is dependent on its etiology, severity, and the clinical setting Mild colonic ischemia supportive care bowel rest and observation nasogastric tube if ileus is present monitor for persistent fever, leukocytosis, peritonitis, or other signs of clinical deterioration most patients will recover within days Moderate colonic ischemia antibiotics antithrombotic therapy indicated for patients with mesenteric venous thrombosis or thromboembolism Severe colonic ischemia signs of peritonitis, pneumatosis on imaging, or gangrene on colonoscopy exploratory laparotomy inidicated in patients with signs of bowel ischemia resected of necrotic bowel if applicable Complications Bowel necrosis Perforation Sepsis Death Stricture/obstruction
QUESTIONS 1 of 2 1 2 Previous Next (M1.GI.13.107) A 75-year-old male is hospitalized for bloody diarrhea and abdominal pain after meals. Endoscopic work-up and CT scan lead the attending physician to diagnose ischemic colitis at the splenic flexure. Which of the following would most likely predispose this patient to ischemic colitis: QID: 101164 Type & Select Correct Answer 1 Increased splanchnic blood flow following a large meal 14% (42/294) 2 Essential hypertension 21% (61/294) 3 Obstruction of the abdominal aorta following surgery 54% (158/294) 4 Hyperreninemic hyperaldosteronism secondary to type II diabetes mellitus 5% (16/294) 5 Juxtaglomerular cell tumor 4% (12/294) M 2 Question Complexity D Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 3 Review Tested Concept Review Full Topic (M1.GI.13.91) A 71-year-old Caucasian male presents to your office with bloody diarrhea and epigastric pain that occurs 30 minutes after eating. He has lost 15 pounds in 1 month, which he attributes to fear that the pain will return following a meal. He has a history of hyperlipidemia and myocardial infarction. Physical exam and esophagogastroduodenoscopy are unremarkable. What is the most likely cause of this patient's pain? QID: 101148 Type & Select Correct Answer 1 Atherosclerosis 47% (80/171) 2 Peptic ulcer disease 25% (43/171) 3 Crohn's disease 6% (11/171) 4 Amyloid deposition 5% (8/171) 5 Diverticulosis 16% (27/171) M 1 Question Complexity E Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 1 Review Tested Concept Review Full Topic