Acute Abdominal Pain with Hematochezia and Constipation

Diagnostic Approach

The American Gastroenterological Association suggests that a patient with acute abdominal pain, constipation, and hematochezia is likely to have a partial intestinal obstruction or inflammatory bowel disease, with intestinal obstruction being the immediate diagnostic priority 1, 2
The European Society of Emergency Radiology recommends evaluating vital signs to detect hemodynamic instability, including blood pressure, heart rate, and orthostatic changes that indicate volume depletion or active bleeding 3
The World Journal of Emergency Surgery suggests that the characteristics of the blood in the stool, such as quantity, color, and frequency, can help differentiate between upper and lower gastrointestinal bleeding 1

The American College of Surgeons recommends initiating fluid resuscitation with intravenous fluids and maintaining the patient on nothing by mouth (NPO) 3
The World Journal of Emergency Surgery suggests that blood transfusion should be considered to maintain hemoglobin levels above 7 g/dL in cases of significant bleeding 2
The American Gastroenterological Association recommends a complete blood count to evaluate for anemia and leukocytosis, which can indicate infection or ischemia 3

The European Society of Radiology recommends a computed tomography (CT) scan of the abdomen and pelvis with intravenous contrast as the initial imaging study of choice for patients with acute abdominal pain and constipation 1, 3
The American College of Radiology suggests that CT scans have higher sensitivity for detecting intestinal obstruction, mesenteric ischemia, and localizing the site of bleeding 1, 3

The American Gastroenterological Association recommends that patients with confirmed inflammatory bowel disease and bleeding should receive intravenous corticosteroids (such as hydrocortisone 100 mg every 6 hours or methylprednisolone 30 mg every 12 hours) for acute severe colitis 5
The World Journal of Emergency Surgery suggests that surgical consultation is urgently indicated if there are signs of peritonitis, hemodynamic instability, complete intestinal obstruction, or suspected mesenteric ischemia 3, 4

The American College of Surgeons recommends against delaying surgical consultation, as mortality increases by 2-12% with each hour of delay in cases of obstruction or ischemia 3
The European Society of Emergency Radiology suggests that assuming mild bleeding does not require urgent evaluation can lead to delayed diagnosis of mesenteric ischemia 2