Florence is a mucosal injury surveillance system conceived for surveying the integrity of the mucosal tissue of the stomach in surgery and critically ill patients. The device gathers relevant information from the tissue through Electrical Impedance Spectroscopy and determines the magnitude of a Reactance Biomarker (XL) that reflects structural features of the tissue. 

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XL reflects changes in gastric tissue structure such as intracellular to extracellular volume ratio and cell membrane ion permeability, both of which are directly affected during hypoxia and ischemia. 

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The magnitude and the trend of XL increase from baseline measurements when the gastric mucosa is subjected to prolonged hypoxia and it can be used as an adjunct tool to aid in the assessment of gastric tissue perfusion in critically ill patients.