Eduovisual
Gastrointestinal
Chronic mesenteric ischemia: diagnosis and revascularization
— SMA involvement is the dominant driver of symptoms; isolated celiac or IMA disease is usually asymptomatic due to collaterals (arc of Riolan, marginal artery of Drummond)
— Non-atherosclerotic causes: median arcuate ligament syndrome (young women, celiac compression), vasculitis (Takayasu, PAN), fibromuscular dysplasia, radiation
— Classic patient: woman age 60–70, smoker, with diffuse atherosclerosis (CAD, PAD, carotid disease, CKD)
— Female:male ≈ 3:1; nearly all patients have ≥1 other vascular bed involved
— Often diagnosed late after months of weight loss and an extensive negative GI workup
— Triad: postprandial abdominal pain ("intestinal angina") + food fear (sitophobia) + weight loss in an arteriopath
— Pain begins 15–60 minutes after eating, lasts 1–3 hours, dull periumbilical/epigastric
— Negative endoscopy, negative cross-sectional imaging for malignancy, unintentional weight loss >10%
— Bruit on abdominal exam in ~50%
— Untreated CMI progresses to acute-on-chronic mesenteric ischemia with bowel infarction and >50% mortality
— Symptomatic CMI is itself a marker of advanced systemic atherosclerosis → high cardiovascular mortality even without bowel events
Board pearl: The Step 3 stem that screams CMI is an older smoker who has lost 20 lb, "stopped eating because it hurts," and has had a normal EGD, colonoscopy, and abdominal CT for "cancer workup." Always re-read for the vascular risk profile and reach for CT angiography of the mesenteric vessels rather than repeating endoscopy.
Step 3 management: Suspicion alone in a high-risk patient warrants outpatient CTA — do not wait for acute decompensation, because mortality jumps from elective (<5%) to emergent (>50%) revascularization.
— Postprandial abdominal pain — dull, crampy, periumbilical or epigastric, beginning 15–60 min after eating, peaking at 1–2 hours, resolving within 3 hours
— Sitophobia (food fear) — patients consciously avoid eating; small, infrequent meals; may favor liquids
— Weight loss — typically >10% body weight over months; distinguishes CMI from functional dyspepsia and IBS
— Pain severity scales with meal size and fat content (highest mesenteric O₂ demand)
— Pain is out of proportion to exam during episodes; abdomen is soft, non-tender between meals
— Patients may describe "intestinal angina" — predictable, reproducible, relieved by not eating
— Early satiety, nausea, occasional vomiting, diarrhea, or steatorrhea from mucosal malabsorption
— Bloating and altered bowel habits — frequently misdiagnosed as IBS or functional dyspepsia for months
— Smoking (current or prior) — present in 75–90%
— Known CAD, prior MI, CABG, PCI, carotid stenosis, PAD with claudication, prior AAA repair
— Hypertension, dyslipidemia, diabetes, CKD
— Family history of premature atherosclerosis
— Medication review: aspirin, statin adherence, antihypertensives
— Functional status, ADLs, nutrition (often profoundly deconditioned)
— Sudden change from predictable postprandial pain to constant, severe pain
— Bloody diarrhea, fever, tachycardia, lactic acidosis → emergency
Key distinction: CMI pain is reliably triggered by food and resolves with fasting; peptic ulcer disease pain is often relieved by food (duodenal) or worsened immediately (gastric). Pancreatic cancer can mimic CMI with weight loss but pain is typically constant, radiates to the back, and not reliably tied to meals.
Board pearl: A patient who has "lost weight because food makes me sick" with a clean GI workup deserves a vascular-bed history before another endoscopy is ordered.
— Cachectic, frail older adult; temporal wasting, loose skin, reduced muscle bulk
— BMI often <20; sarcopenia disproportionate to chronological age
— May appear systemically ill from chronic malnutrition: pale conjunctivae (anemia of chronic disease/iron deficiency), cheilosis, glossitis
— Soft, non-distended, non-tender between meals — the hallmark "benign abdomen" in a patient describing severe pain
— Abdominal bruit in 50–70% — auscultate epigastrium with diaphragm; bruit is suggestive but not specific (also heard in renal artery stenosis, AAA, healthy thin adults)
— Absence of bruit does NOT rule out CMI
— No peritoneal signs; presence of rebound/guarding suggests acute-on-chronic ischemia — surgical emergency
— Carotid bruits, diminished or absent peripheral pulses (femoral, popliteal, DP, PT)
— Ankle-brachial index if peripheral disease suspected
— Aortic palpation for AAA; check for femoral bruits
— Funduscopy may show hypertensive or atherosclerotic retinopathy
— Assess for AF (embolic source), murmurs, signs of HF
— BP in both arms — subclavian disease coexists
— Document orthostatic vitals if volume-depleted from poor intake
— Patients are frequently volume-depleted and pre-renal from sitophobia
— Hypovolemia worsens splanchnic perfusion and can precipitate decompensation
— Avoid aggressive diuresis or vasoconstrictors
Step 3 management: Document a complete vascular review of systems in every suspected CMI patient — coexisting carotid, coronary, and renal artery disease change perioperative planning before revascularization. Order carotid duplex and TTE preoperatively in candidates for open surgical bypass.
Board pearl: A soft, non-tender abdomen in a cachectic smoker with an epigastric bruit and "I'm afraid to eat" is the exam-room CMI gestalt — proceed to mesenteric duplex or CTA, not another EGD.
— CBC: anemia (chronic disease, iron deficiency from mucosal ischemia/malabsorption)
— CMP: prerenal azotemia, electrolyte disturbances from poor intake, hypoalbuminemia (<3.5 g/dL signals malnutrition and predicts worse surgical outcomes)
— Lipid panel, HbA1c: characterize atherosclerotic risk
— Lactate: usually normal in pure chronic disease; elevation suggests acute-on-chronic ischemia and mandates emergent evaluation
— Stool studies (occult blood, fecal fat, calprotectin) — exclude IBD, celiac, pancreatic insufficiency
— Hypercoagulable workup if young patient or atypical vessels (antiphospholipid, JAK2, protein C/S)
— EGD and colonoscopy are nearly always performed before CMI is considered — to exclude malignancy, ulcer, IBD
— May show nonspecific gastropathy or patchy ischemic mucosal changes in watershed areas (splenic flexure)
— Normal endoscopy in a patient with classic symptoms should prompt mesenteric vascular imaging rather than repeat scoping
— Mesenteric duplex ultrasound — preferred initial vascular study; non-invasive, no contrast, no radiation
— Cutoffs suggesting hemodynamically significant stenosis: SMA peak systolic velocity >275 cm/s, celiac PSV >200 cm/s
— Requires fasting state and an experienced operator; bowel gas and obesity limit sensitivity
— Sensitivity ~85–90%, specificity ~90% for SMA stenosis >70%
— Most commonly used first-line definitive imaging in US practice; widely available, fast, characterizes plaque, ostial lesions, and collateral pathways
— Use thin-slice arterial-phase CTA with multiplanar reconstruction
— Watch renal function — many patients have CKD
Board pearl: Order mesenteric duplex as the screening study when CMI is suspected; if positive or equivocal, proceed to CTA for surgical/endovascular planning.
Step 3 management: Do NOT order MR angiography first-line — slower, less spatial resolution at vessel ostia, and gadolinium concerns in CKD.
— Demonstrates ostial/proximal atherosclerotic plaque of celiac and SMA (the typical CMI lesion pattern)
— Identifies collateral pathways (arc of Riolan, marginal artery of Drummond, pancreaticoduodenal arcades)
— Evaluates vessel calcification (affects endovascular feasibility), aortic anatomy for clamp sites, and anomalous origins
— Sensitivity and specificity >95% for ≥70% stenosis
— Pitfalls: heavy calcification can overestimate stenosis; requires iodinated contrast
— Alternative when iodinated contrast contraindicated
— Less spatial resolution at small vessel ostia; tends to overestimate stenosis
— Gadolinium-based agents — caution if eGFR <30 (NSF risk with older agents)
— Gold standard for anatomic delineation and the modality used during endovascular treatment
— Lateral aortogram best visualizes celiac and SMA origins
— No longer purely diagnostic — reserved for therapeutic intervention or when non-invasive studies are equivocal
— Allows pressure gradients across stenoses (>10–15 mmHg gradient confirms hemodynamic significance)
— Tonometry measuring intramucosal pH after meal challenge — research/specialty use only
— Provocative duplex with test meal — confirms postprandial flow inadequacy
— Visceral pressure measurement during exercise (rare)
— Anatomic stenosis on imaging (typically ≥2 of 3 mesenteric vessels, with SMA involved)
— Compatible clinical syndrome (postprandial pain, weight loss, sitophobia) — anatomic stenosis alone is NOT CMI; many older adults have asymptomatic mesenteric atherosclerosis
Key distinction: Asymptomatic mesenteric atherosclerosis is common (~15% of elderly on CT) and does not warrant revascularization. Symptomatic single-vessel SMA disease, however, CAN cause CMI and is treatable — especially when collaterals are poor.
Board pearl: When the stem gives you a classic symptom story plus duplex SMA PSV >275 cm/s, the next step is CTA for procedural planning, not catheter angiography.
— Symptomatic + anatomically significant stenosis = revascularize
— Symptomatic CMI without treatment has unacceptable risk of progression to bowel infarction and death
— Asymptomatic mesenteric stenosis is generally NOT revascularized, even if severe, EXCEPT in select cases (e.g., during aortic surgery for other indications, or before extensive aortic reconstruction that may sacrifice collaterals)
— Endovascular (angioplasty + stenting) is first-line for most patients in modern US practice
— Lower perioperative morbidity/mortality (~3–5% vs 8–15% open)
— Shorter hospital stay, faster recovery, appropriate for frail/malnourished patients
— Higher restenosis rate (~30–40% at 2–3 years) requiring surveillance and reintervention
— Open surgical bypass preferred when:
— Young, low-risk patient with good life expectancy (durable result)
— Long-segment occlusion, heavy calcification, flush ostial occlusion not amenable to stenting
— Failed endovascular therapy
— Concomitant aortic surgery planned
— Nutritional support — many patients are severely malnourished; consider preoperative TPN or enteral nutrition for 7–14 days when feasible (albumin <2.8, weight loss >15%)
— Cardiac risk assessment — ECG, TTE, stress testing if indicated; this population has very high CAD burden
— Smoking cessation counseling — initiate immediately
— Statin, antiplatelet optimization
— Carotid duplex if bruit or prior TIA
— Symptomatic CMI is semi-urgent — schedule revascularization within weeks, not months
— Sudden change in pain pattern → admit and expedite to prevent infarction
Step 3 management: A frail, malnourished 72-year-old smoker with classic CMI and SMA + celiac stenosis on CTA → endovascular SMA stenting after brief nutritional optimization is the favored answer, NOT open aorto-mesenteric bypass.
Board pearl: Always at least attempt to revascularize the SMA; isolated celiac stenting rarely relieves symptoms.
— Aspirin 81 mg daily indefinitely — secondary prevention in established atherosclerosis
— After endovascular stenting: dual antiplatelet therapy (DAPT) with aspirin + clopidogrel 75 mg for at least 1–3 months, often extended to 6–12 months per local protocol, then aspirin monotherapy lifelong
— After open surgical bypass: aspirin alone is standard
— High-intensity statin (atorvastatin 40–80 mg or rosuvastatin 20–40 mg) for all patients with CMI — qualifies as clinical ASCVD
— LDL goal <70 mg/dL; consider ezetimibe or PCSK9 inhibitor if not at goal
— Statins also reduce stent restenosis rates
— Target <130/80 in most CMI patients (concurrent ASCVD, often CKD)
— Preferred agents: ACE inhibitor or ARB (renoprotection, especially with concurrent renal artery disease — monitor creatinine after initiation)
— Avoid abrupt BP drops that can compromise marginal mesenteric perfusion
— A1c target individualized (~7% for most, <8% in frail elderly)
— Prefer agents with cardiovascular benefit: GLP-1 receptor agonists, SGLT2 inhibitors (cautious use given malnutrition risk and volume status)
— Single most important modifiable risk factor
— Combine behavioral counseling with varenicline or nicotine replacement; bupropion is alternative
— Continued smoking dramatically worsens long-term patency after revascularization
— Not routinely indicated unless concurrent indication (AF, hypercoagulable state, prior mesenteric venous thrombosis)
— If hypercoagulable workup positive in young patient → lifelong anticoagulation
— Reserved for non-operative candidates; includes small frequent meals, nutritional supplementation, possibly TPN as a bridge or palliative measure
— Does NOT modify natural history — bowel infarction risk persists
Board pearl: Post-stent CMI patient requires DAPT + high-intensity statin + smoking cessation — these three are the holy trinity of the discharge order set.
Step 3 management: Don't forget to immunize (influenza, pneumococcal, COVID-19) and update colorectal cancer screening — comorbid frailty care matters.
— Percutaneous transluminal angioplasty with stenting of the SMA ± celiac artery
— Femoral or brachial arterial access; brachial often preferred for steep caudal angulation of SMA ostium
— Balloon-expandable covered stents increasingly preferred over bare-metal for ostial atherosclerotic lesions — better patency and lower restenosis
— Periprocedural heparin; embolic protection devices selectively used
— Technical success >95%; perioperative mortality 3–5%
— Primary patency: ~70% at 1 year, ~50% at 3 years → surveillance required
— Complications: access site hematoma/pseudoaneurysm, stent thrombosis, distal embolization causing acute mesenteric ischemia, contrast nephropathy
— Antegrade aorto-mesenteric bypass from supraceliac aorta to SMA ± celiac (preferred when feasible)
— Retrograde bypass from infrarenal aorta or iliac artery — for hostile supraceliac aorta or emergent settings
— Trans-aortic endarterectomy — removes ostial plaque; useful for multi-vessel ostial disease
— Conduits: prosthetic (PTFE, Dacron) preferred for elective; autologous vein in contaminated/infected fields
— Mortality 5–15% depending on patient frailty; better long-term patency (>80% at 5 years) than endovascular
— Retrograde open mesenteric stenting (ROMS) — laparotomy with retrograde SMA cannulation; used in acute-on-chronic with bowel evaluation needed
— Median arcuate ligament syndrome treated by laparoscopic ligament release, NOT stenting (extrinsic compression)
— Slow advancement of diet — start clears, advance as tolerated; watch for reperfusion syndrome (abdominal pain, hyperemia)
— Monitor lactate, abdominal exam for missed bowel injury
— Surveillance duplex at 1, 6, 12 months, then annually
CCS pearl: For CMI admission orders: NPO initially → mesenteric CTA → vascular surgery consult → IV fluids cautiously → aspirin + statin → schedule SMA stenting → post-procedure DAPT, advance diet, surveillance duplex.
Board pearl: Re-stenosis is the rule, not the exception — long-term surveillance is built into the plan.
— Frailty assessment is essential — use Clinical Frailty Scale or simple gait speed
— Endovascular approach strongly preferred in patients >75, frail, or with multiple comorbidities — major mortality reduction vs open surgery
— Nutritional optimization before procedure (consider preoperative enteral or parenteral nutrition for 1–2 weeks if albumin <2.8 g/dL)
— Polypharmacy review — minimize anticholinergics, sedatives, and drugs lowering BP excessively
— Delirium prevention bundles post-procedure
— Goals-of-care conversation appropriate before any major intervention
— Common in CMI population (shared atherosclerotic substrate, frequent renal artery stenosis)
— Contrast-induced nephropathy prevention before CTA or angiography:
— Isotonic IV fluids (normal saline or LR) 1 mL/kg/h for 12 h pre and post in eGFR <60
— Hold nephrotoxins (NSAIDs, ACEi/ARB temporarily peri-procedurally if borderline)
— N-acetylcysteine — evidence weak, no longer recommended routinely
— Minimize contrast volume; consider CO₂ angiography for severe CKD
— Avoid gadolinium-based MRA if eGFR <30 (NSF risk with older agents)
— Hold metformin around iodinated contrast if eGFR <30 or AKI risk
— Less common but relevant if cirrhosis present
— Coagulopathy affects access site bleeding risk and antiplatelet strategy
— Hypoalbuminemia worsens nutritional reserve and wound healing
— Statins: generally safe in compensated cirrhosis; avoid in decompensated disease
— Patients on HD have accelerated vascular calcification → may need surgical bypass over stenting if calcification precludes endovascular approach
— Coordinate procedure with dialysis schedule; avoid procedures on dialysis day if possible
Step 3 management: Frail 82-year-old with CMI, eGFR 28, severe weight loss → preoperative TPN for nutritional rescue + endovascular SMA stenting with minimal-contrast technique and IV hydration, not open aorto-mesenteric bypass.
Board pearl: In CKD + CMI, the answer is usually "endovascular with careful contrast strategy," not "MR angiography."
— Young women, ages 20–40, with postprandial epigastric pain, nausea, weight loss
— Caused by extrinsic compression of celiac artery by the median arcuate ligament of the diaphragm
— Often associated with autonomic features (early satiety, postprandial nausea) and pain with expiration (compression worsens)
— Diagnosis: duplex showing celiac stenosis that worsens with expiration and improves with inspiration; CTA shows "hooked" celiac artery appearance
— Treatment: laparoscopic median arcuate ligament release, NOT stenting (stent fractures from external compression)
— Mixed outcomes; careful patient selection is essential — coexisting functional GI disorder common
— Atherosclerotic CMI extremely rare in pregnancy
— Consider vasculitis (Takayasu), fibromuscular dysplasia, spontaneous mesenteric artery dissection
— Imaging: prefer ultrasound; MRA without gadolinium if needed; CTA only if essential
— Management individualized with maternal-fetal medicine and vascular surgery
— Atherosclerosis exceedingly rare; consider:
— Takayasu arteritis (young women, aortic and great-vessel inflammation)
— Fibromuscular dysplasia (mid-vessel, "string-of-beads")
— MALS
— Segmental arterial mediolysis
— Polyarteritis nodosa
— Hypercoagulable states with chronic mesenteric venous thrombosis
— Workup includes ESR, CRP, ANCA, antiphospholipid panel, hypercoagulable workup
— Treat underlying disease with immunosuppression (steroids ± steroid-sparing agents) before considering revascularization
— Revascularization during active inflammation has poor durability
Key distinction: Atherosclerotic CMI in an older smoker → stent; MALS in a young woman with respiratory variation in celiac flow → laparoscopic ligament release; Takayasu CMI in a young woman with elevated inflammatory markers → immunosuppression first.
Board pearl: Young patient with CMI = think MALS, FMD, or vasculitis, not atherosclerosis. Order ESR/CRP before reaching for a stent.
— Acute-on-chronic mesenteric ischemia — abrupt thrombotic occlusion of an already stenosed vessel; presents as sudden severe pain out of proportion to exam, lactic acidosis, leukocytosis; >50% mortality, requires emergent revascularization ± bowel resection
— Bowel infarction — full-thickness necrosis; requires resection, possible short bowel syndrome
— Severe malnutrition and cachexia — sarcopenia, immune dysfunction, poor wound healing, increased mortality from any subsequent illness
— Death from underlying systemic atherosclerosis — MI and stroke remain leading causes of death even after successful mesenteric revascularization
— Stent thrombosis or distal embolization causing acute mesenteric ischemia (1–5%)
— Access site complications: hematoma, pseudoaneurysm, AV fistula, retroperitoneal bleed
— Contrast-induced nephropathy
— Stent restenosis (30–40% by 2–3 years) — often re-treatable with repeat angioplasty
— Arterial dissection or perforation
— Higher perioperative mortality (5–15%)
— Bowel injury, anastomotic leak, prolonged ileus
— Pulmonary complications (atelectasis, pneumonia) common in malnourished patients
— Graft thrombosis or infection
— Incisional hernia, chronic pain
— After revascularization, sudden restoration of flow can cause transient abdominal pain, hyperemia, mucosal edema, and even hemorrhage
— Typically self-limited; monitor lactate and abdominal exam
— Differentiate from missed bowel injury or stent thrombosis
— Refeeding syndrome when nutritional support resumed in severely malnourished patient — monitor and replete phosphate, potassium, magnesium, thiamine
— Advance enteral feeds slowly
Step 3 management: Post-stent patient with new severe abdominal pain and rising lactate → emergent CT angiography and vascular surgery consultation for suspected stent thrombosis or distal embolization.
Board pearl: Refeeding syndrome — give thiamine before glucose and monitor phosphate daily in the first week.
— Stable postprandial pain pattern, no red flags
— Workup with duplex/CTA, vascular surgery referral, nutritional optimization
— Schedule elective endovascular or surgical revascularization within 2–6 weeks
— Inability to tolerate any oral intake with severe dehydration or weight loss requiring IV fluids and nutritional support
— Acute change in pain pattern (constant rather than postprandial) — concern for impending bowel infarction
— Failure to thrive at home, social barriers to outpatient workup
— Need for expedited revascularization due to severe malnutrition
— Acute-on-chronic mesenteric ischemia — peritonitis, hemodynamic instability, lactic acidosis, septic physiology
— Post-operative monitoring after open surgical revascularization
— Severe refeeding syndrome with electrolyte derangements
— Multiorgan dysfunction
— Vascular surgery — as soon as CMI confirmed; they drive the revascularization strategy
— Interventional radiology — for endovascular approach in centers where IR rather than vascular surgery performs visceral interventions
— Nutrition/dietitian — for preoperative optimization, refeeding planning, post-procedure diet advancement
— Cardiology — preoperative cardiac risk stratification given near-universal CAD
— Nephrology — if eGFR <30 to coordinate contrast strategy and possible peri-procedural dialysis
— Palliative care — non-operative candidates or complex goals-of-care discussions
CCS pearl: A patient with confirmed CMI and an acute change to constant abdominal pain should be admitted, started on IV fluids and IV heparin, made NPO, given broad-spectrum antibiotics if peritoneal signs, and have emergent vascular surgery consultation and CTA ordered simultaneously — do not wait sequentially.
Step 3 management: The exam loves the trigger of escalating, constant pain in a known CMI patient — answer is admit + emergent vascular consult + CTA, not "increase outpatient dose."
— Sudden severe abdominal pain out of proportion to exam, often in patient with AF (embolic, 50%) or hypercoagulable state (venous, 10%)
— Lactic acidosis, leukocytosis early; peritoneal signs late
— Distinguished by abruptness and absence of chronic weight loss/sitophobia
— Emergent intervention required
— Critically ill patients with low cardiac output, vasopressors, recent cardiac surgery, dialysis
— Splanchnic vasoconstriction without large-vessel occlusion
— Treatment: optimize hemodynamics, intra-arterial papaverine
— Young women, celiac compression by diaphragmatic ligament
— Pain worsens with expiration; respiratory variation on duplex
— Treated by laparoscopic ligament release
— Subacute pain over days–weeks; hypercoagulable state, cirrhosis, oral contraceptives, IBD
— CT shows venous filling defects, bowel wall thickening
— Treat with anticoagulation; surgery if bowel infarction
— Splenic, celiac, SMA aneurysms; pain may be variable
— Risk factors: FMD, vasculitis, pregnancy (splenic), trauma
— CTA diagnoses; treat aneurysms >2 cm or symptomatic
— Older patient with sudden lower abdominal pain and bloody diarrhea
— Watershed areas (splenic flexure, rectosigmoid)
— Usually self-limited; treat conservatively unless gangrenous
— Pulsatile mass, back pain; can compromise mesenteric flow if thrombosed
— Imaging distinguishes
Key distinction: Acute mesenteric ischemia = sudden + cardioembolic source + lactate spike; chronic mesenteric ischemia = months of postprandial pain + weight loss + sitophobia; acute-on-chronic = the CMI patient who suddenly gets worse and decompensates.
Board pearl: AF + sudden severe abdominal pain + benign exam → AMI from SMA embolus. CMI patient + new constant pain + lactic acidosis → acute-on-chronic from in situ thrombosis at the atherosclerotic ostium.
— Gastric cancer — early satiety, weight loss, anemia; diagnosed by EGD with biopsy
— Pancreatic adenocarcinoma — epigastric pain radiating to back, weight loss, jaundice if head of pancreas, new-onset diabetes; CT pancreas protocol, CA 19-9
— Colon cancer — change in bowel habits, anemia, weight loss; colonoscopy
— Cholangiocarcinoma — painless jaundice, weight loss; MRCP, CA 19-9
— Epigastric pain — gastric ulcer worsens with food, duodenal ulcer relieved by food and worse at night
— H. pylori testing, EGD with biopsy
— Alcohol or recurrent pancreatitis history; postprandial pain, steatorrhea, weight loss
— CT shows calcifications; fecal elastase low
— Treat with pancreatic enzymes, pain control, alcohol cessation
— Diagnosis of exclusion; Rome IV criteria
— Typically lacks significant unintentional weight loss
— Bloating, postprandial fullness, altered bowel habits
— Diabetic or post-viral; nausea, vomiting, early satiety
— Gastric emptying scintigraphy diagnostic
— Treat with dietary modification, prokinetics
— RUQ pain after fatty meals; ultrasound diagnostic
— Diarrhea, weight loss; tTG-IgA, colonoscopy with biopsy
— In appropriate demographic; weight loss without organic pain
Key distinction: CMI patient has a clean EGD/colonoscopy/cross-sectional GI imaging but persistent classic symptoms — the vascular bed becomes the next stop.
Board pearl: Don't anchor on "must be cancer" in an older smoker with weight loss — if the GI workup is negative and the vascular profile is high, mesenteric duplex or CTA is the diagnostic pivot.
— Post-stent: aspirin 81 mg + clopidogrel 75 mg for 1–6 months (institutional protocol), then aspirin indefinitely
— Post-open bypass: aspirin 81 mg indefinitely
— Consider DAPT extension for high-risk lesions or multi-vessel disease
— Document plan clearly at discharge for transitions of care
— High-intensity statin lifelong (atorvastatin 40–80 mg or rosuvastatin 20–40 mg)
— Target LDL <70 mg/dL; add ezetimibe → PCSK9 inhibitor if not achieved
— Annual lipid panel and liver enzymes
— Goal <130/80; ACEi/ARB preferred; avoid orthostasis
— Home BP monitoring encouraged
— A1c target ~7% (less stringent in frail elderly); GLP-1 RA or SGLT2 inhibitor for CV benefit if appropriate
— Repeat counseling at every visit; combine pharmacotherapy and behavioral support
— Single biggest determinant of long-term patency
— Small frequent meals initially; gradually liberalize
— Dietitian follow-up; protein 1.2–1.5 g/kg/day during recovery
— Supplemental shakes if intake inadequate
— Monitor weight, albumin, prealbumin
— Address vitamin/mineral deficiencies (iron, B12, vitamin D, zinc)
— Annual influenza, pneumococcal (PCV20 or PCV15+PPSV23), COVID-19, shingles, Tdap
— Age-appropriate cancer screening (colorectal, breast, lung if smoker, cervical)
— Aspirin ± clopidogrel
— High-intensity statin
— ACEi/ARB
— Smoking cessation aid
— Diabetes regimen optimized
— Nutritional supplement
— Bowel regimen if on opioids briefly post-op
Step 3 management: The CMI discharge bundle is DAPT + high-intensity statin + ACEi/ARB + smoking cessation pharmacotherapy + nutrition follow-up + duplex surveillance plan — miss any of these on Step 3 and you've lost the question.
Board pearl: Treat CMI patients as established ASCVD for prevention — they earn the high-intensity statin and aspirin regardless of LDL or prior coronary events.
— Mesenteric duplex ultrasound at 1 month, 6 months, 12 months, then annually after endovascular stenting
— Open bypass surveillance: duplex at 6 months, then annually
— Velocity criteria for in-stent restenosis: SMA PSV >275–300 cm/s suggests significant restenosis
— Rising velocities or recurrent symptoms → CTA or angiography for re-evaluation
— Recurrent postprandial pain, food fear, or weight loss should prompt urgent re-evaluation
— Patients should be educated to report new symptoms early — restenosis is treatable if caught before thrombosis
— Track weight weekly initially, then monthly
— Recheck albumin, prealbumin, CBC at 4–6 weeks post-procedure
— Continue dietitian visits until weight stabilizes and intake normalizes
— Annual ASCVD risk reassessment
— Lipid panel at 4–12 weeks after statin initiation/adjustment, then annually
— BP at every visit; A1c every 3–6 months if diabetic
— Carotid duplex if symptoms; AAA screening per USPSTF in eligible patients
— Surveillance for multifocal atherosclerotic progression (renal, peripheral, coronary)
— Cardiac rehab-style supervised exercise program if available; improves outcomes in PAD/CAD
— Mediterranean diet pattern emphasized
— Smoking cessation reinforcement at each visit — relapse common
— Screen for depression — common after prolonged illness and weight loss
— Address caregiver burden in frail elderly
— Reassess functional independence; physical therapy referral if needed
— Vascular surgery at 2–4 weeks, 3 months, then per surveillance schedule
— Primary care at 2–4 weeks for medication reconciliation and global risk factor management
Board pearl: Restenosis is the rule in endovascular CMI — schedule the surveillance duplex at 1 month before the patient leaves the office.
Step 3 management: Recurrent symptoms + rising duplex velocities → repeat angiography with redo angioplasty/stenting, not "trial of medical therapy."
— Discuss realistic expectations: symptom relief, weight regain over months, but substantial restenosis rate (30–40% at 2–3 years)
— Disclose alternatives: medical therapy (with risk of bowel infarction), open surgery, endovascular, no treatment
— Risks: stent thrombosis, contrast nephropathy, distal embolization causing acute mesenteric ischemia and possible bowel resection
— Frail elderly patients require careful capacity assessment; involve surrogates and family as appropriate
— Document goals of care, especially in patients with multiple comorbidities
— Some patients are too frail or unwilling — palliative approach with nutritional support, symptom management, and clear discussion that bowel infarction may be fatal
— Hospice or palliative care consultation appropriate when life expectancy limited
— Hospital → home transition is high-risk for medication errors, especially with DAPT (missed doses → stent thrombosis; over-anticoagulation → bleeding)
— Provide written discharge instructions in plain language
— Confirm pharmacy can fill clopidogrel and statin; address cost/insurance barriers
— Schedule follow-up before discharge; arrange home health if needed
— Reconcile pre-admission medications carefully — restart ACEi/ARB only when renal function and BP stable
— Time-out, correct site, correct procedure
— Contrast allergy screening; pre-medicate if prior reaction
— Renal protection protocol for CKD patients
— If a stent thromboses or distal embolus causes bowel resection, disclose openly per AMA principles
— Document discussions; involve risk management as needed
— Apology and transparency reduce litigation risk
— CMI patients are often elderly, frail, with limited resources
— Address food insecurity in nutritional planning
— Transportation barriers for surveillance imaging visits
Step 3 management: A frail patient on DAPT discharged without confirmed pharmacy access is the classic Step 3 transitions-of-care vignette — the correct next step is to verify medication acquisition and arrange close follow-up before discharge, not assume compliance.
Board pearl: Always reconcile antiplatelets at every transition — DAPT interruption is a common cause of early stent thrombosis.
— Three mesenteric arteries: celiac (T12), SMA (L1), IMA (L3)
— CMI requires ≥2 vessel involvement typically, with SMA being the critical vessel
— Collateral pathways: arc of Riolan (between SMA and IMA), marginal artery of Drummond, pancreaticoduodenal arcades (between celiac and SMA)
— Female:male ≈ 3:1
— Smokers in 75–90%
— Multi-bed atherosclerosis nearly universal
— Median age 60–70
— Postprandial pain + sitophobia + weight loss
— SMA peak systolic velocity >275 cm/s = significant stenosis
— Celiac PSV >200 cm/s = significant stenosis
— Pressure gradient >10–15 mmHg across lesion = hemodynamically significant
— Endovascular SMA stenting (covered stents preferred)
— Open aorto-mesenteric bypass for durable result in fit patients
— Aspirin + clopidogrel (post-stent) → aspirin lifelong
— High-intensity statin
— ACEi/ARB, smoking cessation, nutritional optimization
— MALS — young women, celiac compression, expiratory worsening → laparoscopic release
— Takayasu — young women, elevated ESR/CRP → steroids
— FMD — string-of-beads → angioplasty (no stent)
— Mesenteric venous thrombosis — hypercoagulable state → anticoagulation
— Sudden constant pain in CMI patient → acute-on-chronic
— AF + sudden severe pain → embolic AMI
— Elective endovascular: 3–5%
— Elective open: 5–15%
— Emergent revascularization: >50%
— 30–40% by 2–3 years after stenting — surveillance mandatory
Board pearl: "Older woman smoker + weight loss + fear of eating + clean GI workup" = mesenteric duplex/CTA next.
Step 3 management: Memorize the discharge bundle: DAPT + statin + ACEi/ARB + smoking cessation + nutrition + surveillance duplex at 1 month.
— 68-year-old woman, 40-pack-year smoking history, has lost 25 lb over 6 months. EGD, colonoscopy, abdominal CT all negative. She avoids eating because of crampy epigastric pain 30 minutes after meals. Exam: cachectic, soft abdomen, epigastric bruit. Next step?
— Answer: Mesenteric duplex ultrasound (or CT angiography of mesenteric vessels)
— 28-year-old woman, postprandial epigastric pain worse with exhalation, mild weight loss. Duplex: celiac PSV elevated on expiration, normal on inspiration. Diagnosis and treatment?
— Answer: MALS — laparoscopic median arcuate ligament release
— Known CMI patient awaiting elective stent develops sudden constant severe abdominal pain, lactate 5.2, WBC 22k. Next step?
— Answer: Emergent CT angiography + vascular surgery consult; IV fluids, IV heparin, NPO, broad-spectrum antibiotics
— 65-year-old s/p SMA stenting 1 week ago. Discharge meds? Surveillance?
— Answer: Aspirin + clopidogrel, high-intensity statin, ACEi, smoking cessation aid; duplex at 1, 6, 12 months
— Stem distinguishing CMI vs pancreatic cancer vs PUD vs MALS based on age, vascular risk, pain timing, and imaging clues
— Patient with CMI and eGFR 28 needs definitive imaging. Best approach?
— Answer: Pre- and post-contrast IV isotonic fluids, minimize contrast; consider CO₂ angiography; avoid gadolinium-MRA if eGFR <30
— 32-year-old woman with postprandial pain, weight loss, ESR 90, asymmetric pulses. Diagnosis?
— Answer: Takayasu arteritis — start corticosteroids; revascularization only when inflammation controlled
— Post-stent patient with recurrent food fear at 18 months, duplex SMA PSV 320 cm/s. Next step?
— Answer: Repeat angiography ± redo angioplasty/stenting
— Discharged CMI patient stops clopidogrel due to cost, returns with stent thrombosis and AMI. Question tests on medication reconciliation and access barriers.
Board pearl: The Step 3 stem usually wants you to think mesenteric vasculature before another endoscopy.
Chronic mesenteric ischemia is postprandial intestinal angina from multi-vessel atherosclerotic stenosis (especially SMA) in an older smoker with sitophobia and weight loss — diagnose with mesenteric duplex/CTA after excluding GI malignancy, revascularize (endovascular stenting preferred), and discharge on DAPT + high-intensity statin + ACEi + smoking cessation with scheduled surveillance duplex.
Board pearl: When the Step 3 stem describes "weight loss because food hurts" in a smoker with negative endoscopy, the answer is rarely "repeat endoscopy" — it is imaging the mesenteric arteries.
Step 3 management: Treat CMI patients as established ASCVD — they earn aspirin, high-intensity statin, BP control, and aggressive smoking cessation regardless of LDL or prior coronary events, and they need lifelong duplex surveillance because restenosis is the rule, not the exception.
Key distinction: Chronic mesenteric ischemia = months of postprandial pain + weight loss; acute mesenteric ischemia = sudden severe pain + AF or hypercoagulable state; acute-on-chronic = the CMI patient who suddenly decompensates and needs emergent revascularization.