Acute Mesenteric Ischemia

Acute Mesenteric Ischemia is a sudden condition that affects the blood flow to the intestines, which are part of the digestive system. When the blood supply is blocked or reduced, the intestines do not get enough oxygen and nutrients, causing severe pain and damage. This can lead to tissue death in the intestines if not treated quickly. The main symptoms include sudden, severe abdominal pain, often out of proportion to physical exam findings. It is a medical emergency because the intestines can become permanently damaged, leading to serious complications. The condition mainly affects the arteries supplying the intestines, but veins can also be involved. Early recognition is critical to prevent life-threatening outcomes.

Acute Mesenteric Ischemia (AMI) is defined as a sudden reduction in intestinal blood flow resulting in ischemia and potential infarction of the bowel. The core pathology involves arterial embolism, arterial thrombosis, nonocclusive ischemia, or mesenteric venous thrombosis leading to inadequate oxygen delivery to the intestinal tissues. The superior mesenteric artery is most commonly affected due to its large territory and vulnerability to emboli. AMI is a surgical emergency because prolonged ischemia causes intestinal necrosis, systemic inflammatory response, and sepsis. Clinically, it presents with acute abdominal pain that is often disproportionate to physical exam findings, along with nausea, vomiting, and possible bloody stools. Risk factors include atrial fibrillation, atherosclerosis, and low cardiac output states. Prompt diagnosis and intervention are essential to reduce high morbidity and mortality.