The Hidden Vulnerability: How Underlying SMA Stenosis Turns Routine Intra-Aortic Balloon Pump Support Into Fatal Mesenteric Ischemia.

Intra-aortic balloon pump (IABP) therapy is a widely used mechanical circulatory support device for patients with cardiogenic shock. Although generally safe, IABP insertion can lead to serious complications, including the rare but potentially fatal development of mesenteric ischemia. We report a 58-year-old female smoker who presented with ST-elevation myocardial infarction complicated by cardiogenic shock requiring emergent cardiac catheterization and IABP insertion. Following IABP placement, the patient developed progressive abdominal pain, fever, tachycardia, and bloody bowel movements. CT imaging revealed extensive pneumatosis intestinalis and mural hypoenhancement consistent with small bowel ischemia, along with severe stenosis at the origin of the superior mesenteric artery (SMA). Despite emergent exploratory laparotomy with extensive small bowel resection, the patient developed multiorgan failure and died. This case demonstrates that mesenteric ischemia can occur even when IABP placement appears anatomically appropriate, particularly in patients with underlying visceral vascular disease. The patient's pre-existing high-grade SMA stenosis created a compromised perfusion state where reductions in diastolic blood flow from balloon counterpulsation precipitated catastrophic intestinal ischemia. Clinicians must maintain high clinical suspicion for mesenteric ischemia in patients who develop abdominal symptoms while on IABP support, especially those with visceral atherosclerosis. Early recognition is critical, as delayed diagnosis is almost universally fatal.