Factors predicting positive CT mesenteric angiography results in lower gastrointestinal haemorrhage prior to consideration of intra-arterial angio-embolisation.

Introduction: Lower gastrointestinal haemorrhage (LGIH) is a challenging phenomenon in a comorbid, elderly population. CT mesenteric angiography (CTMA) allows localisation of the site of haemorrhage, and provides a target for interventional techniques, but the intermittent nature of LGIH makes it challenging to reliably demonstrate extravasation. This study aimed to identify objective factors that may predict scan outcomes.