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Serum Lactate Is a Poor Marker of Bowel Ischemia Following Angioembolization for Lower Gastrointestinal Bleeding

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Serum Lactate Is a Poor Marker of Bowel Ischemia Following Angioembolization for Lower Gastrointestinal Bleeding 4 Correspondence Page 1 of 4 Serum lactate is a poor marker of bowel ischemia following angioembolization for lower gastrointestinal bleeding Lynn Soo Hoon Yeo1^, Jiayan Wee2, Kumaresh Venkatesan3 1Department of Anaesthesia, Khoo Teck Puat Hospital/Woodlands Health Campus, Singapore; 2Department of Anaesthesiology, Intensive Care and Pain Medicine, Tan Tock Seng Hospital, Singapore; 3Department of Anaesthesia, Khoo Teck Puat Hospital, Singapore Correspondence to: Lynn Soo Hoon Yeo. Department of Anaesthesia, Khoo Teck Puat Hospital/Woodlands Health Campus, 90 Yishun Central, Singapore 768828, Singapore. Email: [email protected]. Received: 17 April 2020; Accepted: 19 November 2020; Published: 30 December 2020. doi: 10.21037/dmr-20-51 View this article at: http://dx.doi.org/10.21037/dmr-20-51 In patients with suspected active bleeding from the (ED) with abdominal pain and per-rectal bleeding. His lower gastrointestinal tract, urgent angiography and abdomen was soft, tender over left lower quadrant with angioembolization of bleeding vessels is an accepted no generalized peritonism. Computed tomography (CT) management strategy (1). Technological advances in mesenteric angiogram performed showed active contrast interventional radiology have allowed endovascular extravasation in one of the hepatic flexure diverticula, treatment of lower gastrointestinal tract bleeding to be safer keeping with an acute bleed of the right colic artery. and more precise (2). Angioembolization of right colic artery was performed. A known complication after angioembolization of Serum lactate levels were trended routinely after the bleeding vessels is the development of ischemic bowel. The angioembolization procedure. Serum lactate levels remained incidence of ischemic bowel after angioembolization has low at 0.8 to 1.7 mmol/L, however, the patient developed been reported as 13% to 24% in different case series (3,4). persistent right sided abdominal pain and increased The presentation of bowel ischemia is non-specific so leucocytosis. CT abdomen and pelvis showed pneumatosis early recognition and diagnosis is challenging. Delay in coli within the hepatic flexure, Figure 1, most likely due to diagnosis leads to bowel infarction, intra-abdominal sepsis, ischaemia. multi-organ failure and death. A high index of clinical He underwent emergency laparotomy which revealed suspicion is essential. pus at right paracolic gutter. The caecum and ascending Traditionally, it is common practice to measure serial colon were dilated with gangrenous changes seen at hepatic serum lactate levels to identify and diagnose acute ischemic flexure. A right hemicolectomy was performed and he made bowel. However, in recent years, studies have shown that an uneventful recovery. there is a lack of evidence to conclude that serum lactate is elevated early and that it is sensitive enough to correlate Case 2 with bowel ischemia (5,6). We describe three patients who developed ischemic An 84-year-old lady presented to the ED with melena bowel after angioembolization for lower gastrointestinal and lower abdominal discomfort. Her abdomen was soft bleeding who have minimal rise in serum lactate levels. and non-tender on clinical examination. CT mesenteric angiogram showed active hemorrhage within the proximal descending colon, with contrast extravasation during Case 1 selective inferior mesenteric artery (IMA) runs, against a A 64-year-old man presented to the Emergency Department background of diverticular disease. ^ ORCID: 0000-0002-2159-4309. © Digestive Medicine Research. All rights reserved. Dig Med Res 2020;3:118 | http://dx.doi.org/10.21037/dmr-20-51 Page 2 of 4 Digestive Medicine Research, 2020 Figure 1 Gas along the wall at the hepatic flexure is suspicious for Figure 2 Entire segment of the descending colon up to the splenic pneumatosis coli. flexure appears non-enhancing with intramural gas pockets. She underwent angioembolization of proximal branch Table 1 Lactate levels (mmol/L) after angioembolization of IMA as distal embolization was difficult due to patient Time after angioembolization (hrs) Case No. movement and spasm associated with bleeding. Superior 12 24 36 and inferior collaterals were left intact. Again, serum lactate Case 1 1.1 0.8 1.7 levels were trended after the angioembolization procedure and remained unremarkable at 1.3 to 2.1 mmol/L. Case 2 2.1 1.3 2 Despite that, she developed persistent abdominal pain and Case 3 – 1.2 – leucocytosis. CT mesenteric angiogram was repeated within 24 hours and it revealed non-enhancing descending colon hepatic flexure of the colon with intraluminal distension and proximal sigmoid colon with intramural gas pockets, suggesting late arterial or venous hemorrhage. He Figure 2. There was gas tracking along the mesenteric vessel, underwent angioembolization of hepatic flexure artery. particularly around the area of embolization and into the Post-procedure, serum lactate level was 1.2 mmol/L, within portal venous radicles in the left hepatic lobe. the normal range. Frank colonic ischemia from the splenic flexure down to Repeat CT abdomen and pelvis revealed interval oedema the rectosigmoid junction was discovered intra-operatively of the hepatic flexure bowel wall with adjacent fat stranding. during emergency laparotomy and Hartmann’s procedure In view of recent embolization, underlying bowel ischemia was performed. She recovered well after that. could not be totally excluded although no intramural gas was detected. In view of these findings, an emergency Case 3 laparotomy was performed. There was an ischaemic segment seen at hepatic flexure, corresponding to the site of A 37-year-old man, presented to the ED with passing of angioembolization. He underwent a right hemicolectomy fresh blood. He had no abdominal pain. Colonoscopy and was well after that. revealed pan-diverticulosis but no active bleeding was The three cases show that ischemic bowel occurs in the seen. He was discharged but re-presented 2 days later to absence of rising serum lactate levels (Table 1). Their clinical the ED with large amounts of per-rectal bleeding and was characteristics have been summarised in Table 2. hypotensive. It used to be thought that, as a result of ischemia CT mesenteric angiogram showed that there was no and hypoperfusion, intestinal cells undergo anaerobic extravasation demonstrated on the arterial phase images. respiration and release lactate into the circulation. However, there was progressive hyperdensity within the Raised serum lactate as a marker of bowel ischemia © Digestive Medicine Research. All rights reserved. Dig Med Res 2020;3:118 | http://dx.doi.org/10.21037/dmr-20-51 Digestive Medicine Research, 2020 Page 3 of 4 Table 2 Clinical characteristics of the 3 patients Characteristic Case 1 Case 2 Case 3 Demographics 64-year-old man 84-year-old woman 37-year-old man Presentation Abdominal pain and per-rectal Melena and lower abdomen Fresh per-rectal bleeding bleeding discomfort Initial CT mesenteric Hepatic flexure diverticular Proximal descending colon Progressive hyperdensity within hepatic angiogram findings bleeding, acute bleed right bleeding, Background diverticular flexure of colon with intraluminal distension colic artery disease suggesting late arterial or venous bleeding. Background pan-diverticulosis Angioembolization Right colic artery Proximal branch of inferior Hepatic flexure artery mesenteric artery Emergency Gangrenous changes at Ischemia from splenic flexure to Ischemic segment at the hepatic flexure laparotomy findings hepatic flexure the rectosigmoid junction had been supported by studies performed in the past (7). damaged enterocytes found at the tip of intestinal villi and However, it has been increasingly recognised that serum can be detected in serum. Other markers studied include lactate is not adequate as a marker for bowel ischemia (8). a-glutathione S-transferase, amylase, acid-base status, base It is likely that, for serum lactate in the circulation to be excess, C-reactive protein, interleukin-6, creatinine kinase raised, the amount of lactate released into the circulation and D-dimer although none have conclusively been shown needs to exceed the capacity for it to be metabolized. Also, to be definitive (10). if there is sudden total arterial circulatory obstruction as In a patient who had undergone angioembolization in the cases of selective angioembolization, there is lack for lower gastrointestinal bleeding, there should be a of lactate clearance from the corresponding segments of clinical suspicion for development of ischemic bowel as a ischemic gut back into portal circulation. complication. Imaging studies such as an urgent abdominal The risk of developing bowel ischemia is related to the CT with IV contrast has been recommended to confirm vascular territories that have blood flow interrupted by the diagnosis early, so that further management can be angioembolization. The larger the number of vessels and instituted quickly (8). A lack of increasing lactate levels the larger the vascular territories involved, the higher the should not exclude the diagnosis of bowel ischemia. risk of development of ischemic bowel (9). There are also differences between stereoisomers of Acknowledgments lactate. L-lactate is produced by all cells of the body under conditions of anaerobic glycolysis whereas D-lactate is The authors would like to thank Dr. Suresh B. Babu, produced by bacteria in the intestinal mucosa after bacterial interventional radiologist, for his contributions to the article fermentation. for the
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