Bowel Ischemia

Activate emergency general surgery and vascular or endovascular expertise immediately for suspected acute mesenteric ischemia (AMI), particularly with severe abdominal pain disproportionate to examination, atrial fibrillation or recent myocardial infarction, known mesenteric atherosclerosis, shock or vasopressor exposure, aortic dissection, or a prothrombotic state. AMI is caused principally by arterial embolism, arterial thrombosis, nonocclusive mesenteric ischemia (NOMI), or mesenteric venous thrombosis (MVT); treatment depends on separating these branches early. ScienceDirect+2ScienceDirectMesenteric Ischemia - an overviewPubMedMesenteric Ischemia - PMCScienceDirectMultidetector CT Angiography in the Diagnosis of Mesenteric Ischemia

Proceed directly to exploratory laparotomy when peritoneal signs indicate likely transmural necrosis, perforation, or infarction. In occlusive arterial AMI, revascularize before committing to bowel resection when physiology and anatomy permit; irreversible bowel is then resected, often within a damage-control strategy. ScienceDirect+2ScienceDirectMesenteric Ischemia - an overviewWolters KluwerEvidence-based, cost-effective management of... : Journal of Trauma and Acute Care SurgeryWolters KluwerMesenteric ischemia : Current Opinion in Critical Care

Resuscitate suspected AMI promptly with volume loading, correction of electrolyte and metabolic derangements, and treatment of shock while imaging and procedural planning proceed. Broad-spectrum antibiotics, bowel rest, and close monitoring are part of supportive management for ischemic bowel, particularly in NOMI. Wolters Kluwer+1Wolters KluwerEvidence-based, cost-effective management of... : Journal of Trauma and Acute Care SurgeryWileyMethamphetamine‐Induced Bowel Ischemia in a 50‐Year‐Old Male

Order contrast-enhanced multidetector CT with mesenteric CT angiography and arterial plus portal venous phase assessment in patients with suspected AMI. Modern CT with intravenous contrast in arterial and/or portal venous phases enables early diagnosis and guides urgent intestinal revascularization. Wolters Kluwer+2Wolters KluwerMesenteric ischemia : Current Opinion in Critical Carepubs rsnaBiphasic CT with Mesenteric CT Angiography in the Evaluation of Acute Mesenteric Ischemia: Initial ExperienceRadiologyPubMedBiphasic CT with mesenteric CT angiography in the evaluation of acute mesenteric ischemia: initial experience - PubMed

A biphasic mesenteric CT angiography protocol demonstrated 96% sensitivity and 94% specificity for AMI using optimized CT criteria in one prospective series. It identified arterial disease in some patients and altered care, supporting its use as the key first-line anatomic test when AMI is suspected. pubs rsna+1pubs rsnaBiphasic CT with Mesenteric CT Angiography in the Evaluation of Acute Mesenteric Ischemia: Initial ExperienceRadiologyPubMedBiphasic CT with mesenteric CT angiography in the evaluation of acute mesenteric ischemia: initial experience - PubMed

Interpret the scan by vascular compartment and bowel consequence. Arterial occlusion supports embolic or thrombotic AMI; venous-phase mesenteric venous filling defects or absent venous flow support MVT. Pneumatosis, mesenteric edema, and ischemic bowel changes should trigger immediate reassessment of viability and operative need rather than diagnostic delay. Wolters Kluwer+2Wolters KluwerMesenteric Venous Thrombosis Masquerading as... : ACG Case Reports JournalWolters KluwerS3032 Mesenteric Venous Thrombosis Hiding as... : American Journal of GastroenterologyPubMedBiphasic CT with mesenteric CT angiography in the evaluation of acute mesenteric ischemia: initial experience - PubMed

For arterial embolic AMI, urgent removal of the obstructing embolus is the central objective before bowel necrosis develops. Open embolectomy, aspiration embolectomy, and catheter-directed thrombolysis are described treatment options; in patients without peritoneal signs, major SMA embolism has traditionally been managed with embolectomy, whereas peritonitis requires laparotomy, embolectomy, and resection of infarcted intestine. ScienceDirect+2ScienceDirectMesenteric Ischemia - an overviewWolters KluwerMesenteric ischemia : Current Opinion in Critical CareScienceDirectAcute mesenteric ischaemia—Challenging the multidisciplinary emergency service - ScienceDirect

For arterial thrombosis, arrange emergency revascularization. Endovascular recanalization and stenting are important alternatives for acute and chronic thrombotic SMA occlusion, particularly in older or medically fragile patients; observational evidence supports both endovascular and open approaches, with endovascular treatment often favored when anatomy and expertise permit. Wolters Kluwer+1Wolters KluwerMesenteric ischemia : Current Opinion in Critical CarePubMedThe role of endovascular therapy in acute mesenteric ischemia - PMC

For MVT, initiate systemic anticoagulation unless contraindicated, provide bowel rest, intravenous hydration, and decompression as needed. Reserve laparotomy for bowel infarction or perforation. In patients who deteriorate or fail anticoagulation, endovascular therapy can be considered in selected cases. Wolters Kluwer+2Wolters KluwerMesenteric Venous Thrombosis Masquerading as... : ACG Case Reports JournalWolters KluwerMesenteric ischemia : Current Opinion in Critical CareScienceDirectAcute mesenteric ischaemia—Challenging the multidisciplinary emergency service - ScienceDirect

For NOMI, prioritize reversal of the precipitating low-flow state and splanchnic vasoconstriction. In addition to resuscitation, bowel rest, antibiotics, and close monitoring, intra-arterial papaverine has been used; exploratory laparotomy is indicated when peritoneal signs suggest necrotic bowel. ScienceDirect+1ScienceDirectMesenteric Ischemia - an overviewWileyMethamphetamine‐Induced Bowel Ischemia in a 50‐Year‐Old Male

Consider ischemic colitis in an older or hypoperfusion-prone patient with rectal bleeding, with or without abdominal pain and diarrhea. Typical endoscopic disease is erythema with variable ulceration in vulnerable left-colon segments while sparing the rectum; histology demonstrates ischemic hyalinization with crypt atrophy and crypt dropout. A mass-like ischemic lesion can mimic carcinoma, so biopsy interpretation and clinical follow-up should resolve discordance between the endoscopic impression and ischemic pathology. NatureNatureGastrointestinal Pathology - Nature

The splenic flexure and rectosigmoid junction are watershed territories vulnerable to reduced perfusion because collateral flow is relatively poor. Colonic ischemia ranges from transient mucosal-submucosal injury to fulminant transmural necrosis and chronic scarring; severe disease with necrosis requires the same urgent operative escalation used for other ischemic bowel syndromes. ScienceDirect+1ScienceDirectMesenteric Ischemia - an overview | ScienceDirect TopicsScienceDirectINTESTINAL (MESENTERIC) VASCULOPATHY II: Ischemic Colitis and Chronic Mesenteric Ischemia

Consider chronic mesenteric ischemia when recurrent postprandial abdominal pain suggests intestinal angina, particularly in a patient with atherosclerotic disease. Chronic disease usually reflects stenotic or occlusive proximal mesenteric arterial atherosclerosis; CTA can define arterial anatomy and inform revascularization planning when symptoms are attributable to mesenteric arterial insufficiency. PubMed+1PubMedMesenteric Ischemia - PMCpubs rsnaBiphasic CT with Mesenteric CT Angiography in the Evaluation of Acute Mesenteric Ischemia: Initial ExperienceRadiology

After anticoagulation, resuscitation, or revascularization, perform serial abdominal examinations and monitor for recurrent shock, worsening pain, peritoneal signs, or radiographic progression of ischemic injury. Persistent or evolving acute-abdomen findings mandate operative reassessment because infarction and perforation are the key failures of nonoperative management. ScienceDirect+2ScienceDirectMesenteric Ischemia - an overviewWolters KluwerMesenteric Venous Thrombosis Masquerading as... : ACG Case Reports JournalWolters KluwerS3032 Mesenteric Venous Thrombosis Hiding as... : American Journal of Gastroenterology

Following arterial revascularization, reassess bowel viability and use damage-control surgery when instability or uncertain viability precludes definitive reconstruction. Survivors with extensive resection require ongoing assessment for bowel dysfunction, nutritional deficiencies, malabsorption, and parenteral nutrition dependence. Wolters Kluwer+1Wolters KluwerEvidence-based, cost-effective management of... : Journal of Trauma and Acute Care SurgeryWolters KluwerMesenteric ischemia : Current Opinion in Critical Care

Following MVT, investigate local inflammatory drivers and thrombophilic conditions because the etiologic finding informs recurrence prevention and broader management. MVT can be idiopathic, but malignancy, JAK2 mutation, and myeloproliferative disorders are specifically important diagnostic considerations. Wolters KluwerWolters KluwerMesenteric Venous Thrombosis Masquerading as... : ACG Case Reports Journal