Intestinal blood flow assessment by indocyanine green fluorescence imaging in a patient with the incarcerated umbilical hernia: Report of a case.

Patient : A woman in her 40s. Chief complaint : Abdominal pain.

Hypertension and diabetes (well controlled with oral medications).

The patient was anemic, with a hemoglobin level of 5.8 g/dl. Inflammatory response was also elevated, with a white blood cell count of 12,370/μl and a C-reactive protein level of 2.9 mg/dl.

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Written informed consent was obtained from the patient for publication of this Case report and any accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.

This study was approved (approval No. 13-B-60) by the Research Ethics Committee at the International University of Health and Welfare, Tochigi, Japan.

The patient developed pain involving the entire abdomen starting 3 days earlier and gradually exacerbating, so she visited our hospital.

SR have made substantial contributions to conception and design, or acquisition of data, or analysis and interpretation of data. MY have been involved in drafting the manuscript or revising it critically for important intellectual content. OH have get in on a discussion about this study. NT have get in on a discussion about this study. NS have get in on a discussion about this study. EI have get in on a discussion about this study. KN have get in on a discussion about this study. SY have get in on a discussion about this study. MK have get in on a discussion about this study. YS have given final approval of the version to be published. All authors read and approved the final manuscript.

Vital signs were normal, except for a body temperature of 38.1 °C. The abdomen was distended, with an 8-cm mass palpable at the umbilicus, but no tenderness was apparent ( Fig. 1 ).

A midline incision was made in the lower abdomen for laparotomy, and the incarcerated bowel was reduced. Serous ascites was present in the hernia sac. The small bowel that had been incarcerated showed dark-red discoloration ( Fig. 2 ). Two milliliters of ICG (5 mg/ml) was injected intravenously, and blood flow was observed using the PINPOINT system. Fluorescence was seen in the arteries of the mesentery, followed by uniform fluorescence throughout the small bowel wall. The bowel with dark-red discoloration also showed fluorescence, thus indicating the absence of irreversible ischemic changes. Bowel resection was therefore not performed ( Fig. 3 ). Because of anemia requiring blood transfusion, simple total hysterectomy and bilateral salpingo-oophorectomy were performed for the ovarian cysts bilaterally, then the hernia sac was removed, and the abdomen was closed.

Imaging revealed an umbilical hernia and incarceration of a loop of small bowel. The entire small bowel was distended with fluid-fluid levels, with ascites on the liver surface and in the pelvis. Large multilocular masses with calcification were evident in the pelvis. The patient was diagnosed with anemia due to bilateral ovarian tumors and bowel obstruction due incarcerated umbilical hernia, so surgery was performed.

The authors declare that they have no competing interests.

The authors declare that they have no conflicts of interest.

Shunjin Ryu. E-mail: [email protected] Department of Surgery, International University of Health and Welfare Hospital. 537-3, Iguchi Nasushiobara, Tochigi, 329-2763, Japan.

In surgery for incarcerated hernia, intestinal blood flow (IBF) and the possible need for bowel resection must be evaluated after reducing the incarceration. We report herein the case of a patient with incarcerated umbilical hernia in whom the bowel could be preserved by evaluation of IBF using a brightfield color near-infrared fluorescence camera (PINPOINT; Novadaq, Mississauga, Canada) and indocyanine green (ICG) fluorescence. This study using the PINPOINT system was approved by the Research Ethics Committee at the International University of Health and Welfare, Tochigi, Japan (approval no. 13-B-60). Personal information of patient was protected. This paper has been reported in line with CARE criteria.

Observation of IBF has previously been reported by ICG fluorescence method using a brightfield color near-infrared fluorescence camera (HyperEye Medical System) [1] . In our patient, ICG was injected from a peripheral vein, and blood flow in the incarcerated bowel was evaluated using the PINPOINT, brightfield color near-infrared fluorescence laparoscopy system. This PINPOINT system simultaneously displays fluorescence and color imaging in a single video, enabling simultaneous observation of usual fluorescence and color images. Surgery can therefore proceed without interruption during fluorescence imaging. This system can also be used in laparoscopic surgery [2] . IBF and the possible need for bowel resection must be observed after incarceration is reduced during surgery, not only for incarcerated umbilical hernias, but in all incarcerated hernias. IBF is usually evaluated by observing bowel color, the presence or absence of peristalsis, the presence or absence of bleeding from the bowel resection stump, and arterial pulsations in the mesentery. Bowel resection is necessary if signs of irreversible ischemia are apparent in the previously incarcerated bowel. However, evaluation of bowel ischemia is difficult in some patients. There may be little evidence of viability when bowel ischemia is suspected, and in patients with pathologies such as non-occlusive mesenteric ischemia (NOMI), in whom deciding on the extent of resection may be difficult at initial surgery, a second-look operation has been recommended [3] , [4] . Intraoperative angiography and laser Doppler flowmetry have also been used to evaluate IBF during surgery [5] [6] . With evaluation by ICG fluorescence, blood flow can be observed by injecting ICG from a peripheral vein. This can be highly useful from the perspectives of convenience, speed, and allowing wide-area observation. ICG fluorescence evaluation of blood flow has already been reported in superior mesenteric artery occlusion [7] , strangulation ileus [8] , and NOMI [9] , but application in incarcerated hernias has not previously been described in the existing literature. We found no similar reports in a PubMed search using the keywords “incarcerated hernia, ICG” or “strangulated hernia, ICG.” The small bowel in our patient was discolored after reducing the incarceration, and deciding whether to perform bowel resection was difficult. However, ICG fluorescence confirmed good IBF, so we completed surgery without bowel resection. The patient showed a good postoperative course. If we had not performed the ICG fluorescence, we would have performed bowel resection to maximize safety. We thus believe that ICG fluorescence may be useful for evaluating IBF in patients with incarcerated hernias.

ICG fluorescence may be useful for evaluating IBF in patients after reducing incarcerated hernias, but should be evaluated in clinical trials Prior to ist broad implementation.

The patient resumed eating on day 4 after surgery and was discharged on day 11. There is no adverse event. Histopathology of the resected uterus and adnexa showed bilateral ovarian cysts, uterine myoma, and adenomyosis. At 6 months postoperatively, no evidence of recurrence of the umbilical hernia has been identified.