Step 1 → Gastrointestinal Gastrointestinal Bleeding and IschemiaPreview this topic sectionPreview the conditions. Plans unlock the full Step 1 details when you need them. Free Biochemistry Free Microbiology Plans Gastrointestinal Bleeding and Ischemia conditions Acute Gastrointestinal Bleeding (Lower) Acute Gastrointestinal Bleeding (Upper) Acute Mesenteric Ischemia Angiodysplasia Chronic Mesenteric Ischemia Colonic Ischemia Nutcracker Syndrome