Gastric intramucosal pH as a monitor of gut perfusion after thrombosis of the superior mesenteric vein.

Gastric intramucosal pH (pHi) when measured by a tonometer is a simple and minimally invasive method to determine gut ischemia. In a case of severe mesenteric venous thrombosis, we measured pHi intra- and postoperatively over a period of five days. The goal was to monitor improvement or deterioration of gastrointestinal perfusion in the intensive care unit and to perform a second-look laparotomy if the condition worsened. We observed that gastric pHi is a more sensitive parameter for detecting intestinal ischemia than parameters such as arterial pH, base excess, or lactate. This patient's pHi rose continuously, which allowed us to proceed in a conservative way without any further invasive diagnostic interventions. Thus, the application of a gastric tonometer in cases of mesenteric venous thrombosis may help to reduce costs by preventing unnecessary postoperative diagnostic maneuvers such as angiography, computed tomography, or even second-look laparotomy.