GI Bleeding, Pancreatitis and the Acute Abdomen

Gastrointestinal Hemorrhage: Assessment, Resuscitation, and Procedural Safety

Gastrointestinal hemorrhage is classified by its relationship to the ligament of Treitz. Bleeding originating proximal to this anatomical landmark is designated as upper gastrointestinal bleeding, whereas bleeding distal to it arises in the small bowel, colon, or rectum. Many current clinical classifications reserve the term lower gastrointestinal bleeding specifically for colonic or rectal sources. Patients with upper tract bleeding characteristically present with hematemesis and melena. Conversely, hematochezia typically points to a lower gastrointestinal origin, although massive, rapid upper tract hemorrhage can also manifest with bright red blood per rectum.

Peptic ulcer disease remains a leading cause of nonvariceal upper gastrointestinal bleeding, while stress-related mucosal bleeding represents an additional ongoing threat in critically ill patients. When portal hypertension develops, most commonly secondary to hepatic cirrhosis, patients are at risk for esophageal and gastric variceal hemorrhage. Medical management of acute variceal bleeding includes a continuous intravenous octreotide infusion, which works by reducing portal venous pressure and splanchnic blood flow. For high-risk peptic ulcers following endoscopic hemostasis, high-dose intravenous proton pump inhibitors are administered either intermittently or by continuous infusion as ordered. Importantly, these infusions are delivered as prescribed and are not titrated to a measured gastric pH.

Resuscitation during massive gastrointestinal hemorrhage requires rapid coordination. Nurses must monitor patient response to blood products transfused under an ordered massive transfusion protocol while actively avoiding overresuscitation. In variceal bleeding, overtransfusion carries the specific danger of increasing portal pressures, which directly elevates the risk of rebleeding. Before urgent endoscopy, the critical care nurse assesses airway protection and anticipates provider-directed intubation if active hematemesis or an impaired level of consciousness places the patient at high risk for aspiration. Intravenous erythromycin may be administered prior to the procedure to stimulate gastric motility and clear pooled blood from the stomach, thereby optimizing mucosal visualization.

Post-procedure vigilance is essential. Following esophagogastroduodenoscopy, the nurse monitors closely for signs of gastrointestinal perforation, such as sudden epigastric, back, or shoulder pain, alongside subcutaneous emphysema. For patients who undergo endoscopic hemostasis of a high-risk peptic ulcer, recurrent hemorrhage and hemodynamic deterioration are most likely to occur within the initial 72 hours. When variceal hemorrhage is refractory to medical and endoscopic therapy, balloon tamponade tubes, such as the Sengstaken-Blakemore or Minnesota tube, function as a temporary bridge to definitive intervention. Whenever a balloon tamponade tube is in use, keep scissors at the bedside so the tamponade tube can be cut to deflate its balloons and then removed if migration obstructs the airway; maintain the patient's airway protection. Furthermore, when the esophageal balloon is inflated, the nurse must monitor balloon pressure and inflation duration strictly according to device specifications, provider orders, and institutional protocols to prevent esophageal ischemia and tissue necrosis.