@entity63 is a well known complication following surgery of @entity1755 , occurring in up to 60% of these @entity1 . It is caused by failure to restore adequate blood flow to the watershed areas of the sigmoid colon. The purpose of this prospective study was to investigate erythrocyte flux to defined areas of the colon immediately after repair of @entity1755 using laser Doppler flowmetry (LDF) and to determine the critical level of erythrocyte flux below which revascularization of the colon is indicated. A group of 22 @entity1 with a @entity1755 in whom the inferior mesenteric artery was ligated at surgery were studied prospectively. Multiple LDF measurements of bowel blood flow (four per bowel segment) were performed on 103 intestinal segments intraoperatively using a Periflux 4001 Master with a PF 415:1 probe. In addition, histologic findings of ischemically injured intestine biopsied at routine postoperative endoscopy or postmortem examination were compared with the LDF records. There was a 41% incidence (9/22 @entity1 ) of postoperative @entity63 with a significant decrease in colonic erythrocyte flux below 50 perfusion units (PU) intraoperatively in all nine @entity1 (100%). Four @entity1 had transmural colon @entity39 , and two @entity1 died, for an overall mortality of 27%. Five @entity1 were identified as having mild or moderate @entity63 and were treated conservatively. Another 14 @entity1 had no clinical or endoscopic signs of @entity63 . Erythrocyte flux in those @entity694 were > 50 PU. An intraoperative LDF recording of < 50 PU achieved a sensitivity of 100% (32/32 colon segments) and a positive prediction value of 100% in @entity1 who developed @entity63 after surgery for @entity1755 . The results of this study demonstrate that LDF is a sensitive guide to and feasible method for evaluating critical colonic blood flow during repair of @entity1755 . The critical level of microvascular perfusion of the colon wall was found to be around 50 PU, below which revascularization of the colon should be considered to reduce the risk of subsequent @entity63 .

Intraoperative assessment of intestinal viability by laser Doppler flowmetry for surgery of XXXX .

@entity1 :: ('9606', 'Species') :: ['patients'] @entity1755 :: ('MESH:D001019', 'Disease') :: ['ruptured abdominal aortic aneurysm', 'ruptured infrarenal aortic aneurysm', 'ruptured abdominal aortic aneurysms'] @entity39 :: ('MESH:D009336', 'Disease') :: ['necrosis'] @entity63 :: ('MESH:D007511', 'Disease') :: ['ischemic colitis', 'intestinal ischemia', 'colonic ischemia', 'Ischemic colitis'] @entity694 :: ('MESH:D003110', 'Disease') :: ['colonic segments']
@entity1755 :: (MESH:D001019,Disease) :: ['ruptured abdominal aortic aneurysms']
