Use Of Indocyanine Green Fluorescence Research Articles

The use of indocyanine green for lateral lymph node dissection in rectal cancer—preliminary data from an emerging procedure: a systematic review of the literature

IntroductionLateral lymph node dissection (LLND) for rectal cancer is still not a widely established technique owing to the existing controversy between Eastern and Western countries and the lack of well-designed studies. The risk of complications and the paucity of long-term oncological results are significant drawbacks for further applying this technique. The use of indocyanine green (ICG) near-infrared (NIR) fluorescence for LLND appears as a promising technique for enhancing postoperative and oncological outcomes. This review aims to evaluate the emerging role of ICG during LLND and present the benefits of its application.Materials and methodsSystematic electronic research was conducted in PubMed and Google Scholar using a combination of medical subject headings (MeSH). Studies presenting the use of ICG during LLND, especially in terms of harvested lymph nodes, were included and reviewed. Studies comparing LLND with ICG (LLND + ICG) or without ICG (LLND-alone) were further analyzed for the number of lymph nodes and postoperative outcomes.ResultsIn total, 13 studies were found eligible and analyzed for different parameters. LLND + ICG is associated with significantly increased number of harvested lateral lymph nodes (p < 0.05), minor blood loss, decreased operative time, and probably decreased urinary retention postoperatively compared with LLND-alone.ConclusionsThe use of ICG fluorescence during LLND is a safe and feasible technique for balancing postoperative outcomes and the number of harvested lymph nodes. Well-designed studies with long-term results are required to elucidate the oncological benefits and establish this promising technique.

Clinical Application of Multimodal Sentinel Lymph Node Mapping Method in Patients with Breast Cancer Undergoing Neoadjuvant Chemotherapy: An Interim Analysis.

After neoadjuvant chemotherapy (NAC), the SLN identification rate is lower and has a higher false-negative rate than that at upfront surgery. This clinical trial aimed to confirm the effectiveness of sentinel lymph node (SLN) surgery by determining the lymph node identification rate using multimodal SLN marker methods in patients with advanced breast cancer undergoing NAC. This clinical study is a prospective single-center randomized controlled trial involving patients with breast cancer receiving NAC. Patients are randomized (1:1:1) into arm A that involves the use of radioisotope (RI) plus indocyanine green fluorescence (ICG-F); arm B, RI plus vital dye; and, arm C, ICG-F plus vital dye. A total of 348 patients are needed. An interim analysis was performed on 50% of the patients enrolled. The primary outcome of this trial was the SLN identification rate. Among the 164 total patients (median age 51 years), T2 and N1 were the most common clinical stages. The identification rate of SLN was 95% in arm A, 92% in arm B, and 79% in arm C. To assess superior efficacy, the one-sided endpoint was set at α < 0.0056. Arms A and C showed a difference of 0.1597 in the detection rate (p = 0.0055). The use of ICG-F plus vital dye for SLNB was the least effective. The results show that the choice of tracer should be radioisotope in combination with one of the other tracers to have the highest SLN identification rate when SLNB cannot be implemented conventionally due to the circumstances of each institution.

Correlation of pathological examination with indocyanine green (ICG) intensity gradients: a prospective study in patients with liver tumor

BackgroundIntraoperative indocyanine green (ICG) fluorescence imaging has been shown to be a new and innovative way to illustrate the optimal resection margin in hepatectomy for hepatocellular carcinoma. This study investigated its accuracy in resection margin determination by looking into the correlation of ICG intensity gradients with pathological examination results of resected specimens.MethodsThis was a prospective, single-center, non-randomized controlled study. Patients who had liver tumors indicating liver resection were recruited. The hypothesis was that the use of intraoperative near-infrared/ICG fluorescence imaging would be a promising guiding tool for removing hepatocellular carcinoma with a better resection margin. Patients were given ICG (0.25 mg/kg) 1 day before operation. Resected specimens were inspected under a fluorescent imaging system. Biopsies were taken from tumors and normal tissue. Color signals obtained from ICG fluorescence imaging were compared with biopsies for analysis.ResultsTwenty-two patients were recruited for study. The median size of their tumors was 2.25 cm. One patient had resection margin involvement. Under ICG fluorescence, the tumors typically lighted up as yellow color, wrapped by a zone of green color. Tumors of 17 patients (77.3%) displayed yellow color and were confirmed malignancy, while tumors of 12 patients (54.5%) displayed green color and were confirmed malignancy. Receiver operating characteristic curve was used to measure the sensitivity and specificity of the green color to look for a clear resection margin. The area under the curve was 85.3% (p = 0.019, 95% confidence interval 0.696–1.000), with a sensitivity of 0.706 and specificity of 1.000.ConclusionThe use of ICG fluorescence can be helpful in determining resection margins. Resection of tumor should include complete resection of the green zone shown in the fluorescence image.

ICG-Fluorescence Imaging for Margin Assessment During Minimally Invasive Colorectal Liver Metastasis Resection

Unintended tumor-positive resection margins occur frequently during minimally invasive surgery for colorectal liver metastases and potentially negatively influence oncologic outcomes. To assess whether indocyanine green (ICG)-fluorescence-guided surgery is associated with achieving a higher radical resection rate in minimally invasive colorectal liver metastasis surgery and to assess the accuracy of ICG fluorescence for predicting the resection margin status. The MIMIC (Minimally Invasive, Indocyanine-Guided Metastasectomy in Patients With Colorectal Liver Metastases) trial was designed as a prospective single-arm multicenter cohort study in 8 Dutch liver surgery centers. Patients were scheduled to undergo minimally invasive (laparoscopic or robot-assisted) resections of colorectal liver metastases between September 1, 2018, and June 30, 2021. All patients received a single intravenous bolus of 10 mg of ICG 24 hours prior to surgery. During surgery, ICG-fluorescence imaging was used as an adjunct to ultrasonography and regular laparoscopy to guide and assess the resection margin in real time. The ICG-fluorescence imaging was performed during and after liver parenchymal transection to enable real-time assessment of the tumor margin. Absence of ICG fluorescence was favorable both during transection and in the tumor bed directly after resection. The primary outcome measure was the radical (R0) resection rate, defined by the percentage of colorectal liver metastases resected with at least a 1 mm distance between the tumor and resection plane. Secondary outcomes were the accuracy of ICG fluorescence in detecting margin-positive (R1; <1 mm margin) resections and the change in surgical management. In total, 225 patients were enrolled, of whom 201 (116 [57.7%] male; median age, 65 [IQR, 57-72] years) with 316 histologically proven colorectal liver metastases were included in the final analysis. The overall R0 resection rate was 92.4%. Re-resection of ICG-fluorescent tissue in the resection cavity was associated with a 5.0% increase in the R0 percentage (from 87.4% to 92.4%; P < .001). The sensitivity and specificity for real-time resection margin assessment were 60% and 90%, respectively (area under the receiver operating characteristic curve, 0.751; 95% CI, 0.668-0.833), with a positive predictive value of 54% and a negative predictive value of 92%. After training and proctoring of the first procedures, participating centers that were new to the technique had a comparable false-positive rate for predicting R1 resections during the first 10 procedures (odds ratio, 1.36; 95% CI, 0.44-4.24). The ICG-fluorescence imaging was associated with changes in intraoperative surgical management in 56 (27.9%) of the patients. In this multicenter prospective cohort study, ICG-fluorescence imaging was associated with an increased rate of tumor margin-negative resection and changes in surgical management in more than one-quarter of the patients. The absence of ICG fluorescence during liver parenchymal transection predicted an R0 resection with 92% accuracy. These results suggest that use of ICG fluorescence may provide real-time feedback of the tumor margin and a higher rate of complete oncologic resection.

Use of Indocyanine Green Fluorescence During Total Thyroidectomy to Identify Parathyroid Glands and Prevent Hypoparathyroidism.

Total thyroidectomy is associated with a high rate of transient or permanent hypoparathyroidism. During surgery, indocyanine green (ICG) fluorescein angiography can be used to detect and preserve well-vascularized parathyroid glands. This technique has been introduced as an intraoperative support to prevent postoperative hypoparathyroidism. One-hundred consecutive patients who had undergone total thyroidectomy were included in this study. Autofluoroscopy was used on the first dominant side of thyroidectomy and to identify the contralateral parathyroid glands. An intravenous bolus of 5 mg ICG (VERDYE, Diagnostic Green GmbH, Aschheim-Dornacht, Germany) was administered once. ICG fluorescein angiography was used as a "bridge" at the end of the first dominant hemithyroidectomy and after exposure of the parathyroid glands on the second side. This allowed us to (i) determine the vascularization of the first two parathyroid glands and (ii) define the blood vessels and thus the line of dissection of the parathyroid glands of the second resection side. Finally, autofluoroscopy was then applied outside the surgical area on the surgical specimen to assess forgotten parathyroid glands, which should therefore be re-implanted. Autofluoroscopy and ICG fluorescein angiography were evaluated in real time using the same technology, i.e., FLUOBEAM® LX (EUROPE - Fluoptics Grenoble, France; USA - Fluoptics Imaging Inc., Cambridge, MA, USA). The study was approved by the local ethics committee. Autofluorescence and ICG fluorescein angiography were performed without any problems in all cases. A total of 370 parathyroid glands were detected in this series. ICG changed the surgical strategy for the first-side parathyroid glands in 5% of cases, i.e,. they were not well-vascularized and were re-implanted. The rate of transient hypoparathyroidism was 19%. The percentage of parathyroids in the surgical specimen was 3.5% and all were re-implanted during the same surgery. There was no case of postoperative definitive hypoparathyroidism when at least one parathyroid gland with a high fluorescence intensity was preserved on the first side of resection. Use of ICG fluorescein angiography may contribute to predicting and thus preventing postoperative definitive hypoparathyroidism after total thyroidectomy. The results of this case series confirm recent studies. Caution is advised when weakly perfused parathyroid glands are discovered.

Impact of tumor stage and neoadjuvant chemotherapy in fluorescence-guided lymphadenectomy during laparoscopic gastrectomy for gastric cancer: A propensity score-matched study in a western center

BackgroundThe use of indocyanine green fluorescence has been shown to be a safe and effective method for improving lymph node retrieval in patients with gastric cancer. However, previous studies have focused on early-stage tumors and/or the Asian population and excluded patients who received neoadjuvant treatment. MethodsIn this study, 142 patients with gastric adenocarcinoma underwent laparoscopic gastrectomy at a Spanish hospital between January 2017 and December 2022. Of these, 42 patients received preoperative indocyanine green injection to guide lymphadenectomy. Their outcomes were compared to a retrospective cohort of 42 patients after 1:1 propensity score matching. ResultsThe feasibility of indocyanine green lymphatic mapping was 95.5%. No complications associated with indocyanine green injection were observed. The indocyanine green group had a significantly higher number of retrieved lymph nodes than the non-indocyanine green group (32.67 vs 25.14; P = .013). This statistically significant difference was maintained across subgroups of neoadjuvant treatment, non-obese patients, pT0 to 2 stage, and pN0 stage. In 47.6% of patients from the indocyanine green group, lymphadenectomy was extended outside the standard D2 dissection area based on indocyanine green uptake, but none of the retrieved lymph nodes were metastatic. There were no differences in postoperative complications and length of hospital stay between the 2 groups. ConclusionIndocyanine green-guided lymphadenectomy is safe and feasible and increases the number of retrieved lymph nodes compared to conventional lymphatic dissection, as well as in patients receiving neoadjuvant chemotherapy. The use of indocyanine green should be routine if available for guiding lymph node dissection in gastric cancer, regardless of tumor stage or previous neoadjuvant treatment. However, further studies are needed to determine the impact of this technique on disease-free and overall survival.

Indocyanine Green-enhanced Fluorescence to Assess Bowel Perfusion During Robotic-assisted Rectal Surgery

ABSTRACT Introduction Anastomotic leakage following rectal surgery is a major complication, which may occur due to insufficient vascular supply. We aimed to evaluate the efficacy of using indocyanine green fluorescence angiography for intraoperative assessment of vascular anastomotic perfusion in robotic low anterior resection. Methods This was a retrospective cohort study that included consecutive patients undergoing robotic low anterior resection for rectal cancer between March 2017 and February 2019. Intraoperative use of indocyanine green fluorescence for assessment of bowel perfusion was performed in patients operated after April 2018. Those who underwent the surgery before that comprised the control group. The primary outcome was the occurrence of anastomotic leakage between the two groups. Results Each group included 48 patients. There were no significant differences between the two groups in terms of demographic data or tumor characteristics. The planned anastomotic site was revised in 1 of 48 patients who received indocyanine green fluorescence based on the surgeon's subjective finding of a hypo-perfused distal segment. Postoperative anastomotic leakage was confirmed clinically and radiologically in one patient (2.8%) in the indocyanine green group compared with two patients (4.16%) in the control group. Conclusion Indocyanine green fluorescence may be considered a useful intraoperative tool for assessment of vascular perfusion of bowel during robotic rectal surgery. Change in the site of resection and/or anastomosis may be indicated, possibly affecting the incidence of anastomotic leakage.

Outcomes of Anastomotic Evaluation Using Indocyanine Green Fluorescence during Minimally Invasive Esophagectomy.

Limited evidence exists assessing whether anastomotic evaluation using indocyanine green fluorescence (IGF) during minimally invasive esophagectomy (MIE) predicts or improves outcomes. We hypothesized that IGF helps surgeons predict anastomotic complications and reduces anastomotic leaks after MIE. In September 2019, our institution began routinely using IGF for intraoperative evaluation of anastomoses during MIE. Data were collected from patients undergoing MIE in the two years before and after this technology began being routinely used. Baseline characteristics and outcomes, including anastomotic leak, in patients who underwent indocyanine green fluorescence evaluation (ICG) and those who did not (nICG) were compared. Outcomes were also compared between ICG patients with normal versus abnormal fluorescence. Overall, 181 patients were included. Baseline demographic and clinical characteristics did not differ between the ICG and nICG groups. ICG patients experienced higher rates of anastomotic leak (10.2% vs. 1.6%, P = .015) and 90-day mortality (8.5% vs. 1.6%, P = .04) compared to nICG patients. Due to lack of equipment availability, 19 nICG patients underwent MIE after the use of IGF became routine, and none developed leaks. ICG patients with abnormal fluorescence had higher rates of anastomotic leak (71.4% vs 1.9%, P < .001) and 30-day mortality (28.6% vs 0%, P = .012) compared to those with normal fluorescence. Abnormal intraoperative IGF was associated with increased rate of anastomotic leak, suggesting predictive potential of IGF. However, its use was associated with an increased leak rate and higher mortality. Further studies are warranted to assess possible physiologic effects of indocyanine green on the esophageal anastomosis.

The Use of Indocyanine Green (ICG) in the Detection of Endometriosis-Related Fibrosis and Inflammatory Changes

<h3>Study Objective</h3> Indocyanine green (ICG), a dye that fluoresces in areas of increased vascularity, has been shown to aid in the identification of endometriosis in otherwise normal-appearing or ambiguous 'clear' lesions. Fibrosis and inflammation involve vascular processes known to play a significant role in the natural history and pathogenesis of endometriosis. The aim of this study is to determine if ICG can detect fibrosis or inflammatory changes seen on histopathology, and to determine if such histopathologic evidence of fibrosis is associated with endometriosis. <h3>Design</h3> Retrospective chart review. <h3>Setting</h3> A community-based hospital. <h3>Patients or Participants</h3> Women ranging from ages 18-50 undergoing minimally invasive surgery using ICG for the diagnosis and treatment of suspected endometriosis between July 2014 to February 2022. <h3>Interventions</h3> Robotic-assisted resection of areas visualized using ICG fluorescence. <h3>Measurements and Main Results</h3> Of the 64 patients in this study, a total of 211 peritoneal biopsies from the pelvis were examined on pathology for presence of fibrosis and endometriosis. The use of ICG fluorescence demonstrated a sensitivity of 97.4% in detecting fibrosis and inflammatory changes with a negative predictive value (NPV) of 86.7%. A Chi-square statistical test was performed to calculate a significance value of 5.07 (p=0.024). Based on the chi-square result, the presence of fibrosis detected using ICG fluorescence is significantly associated with the histopathological diagnosis of endometriosis. <h3>Conclusion</h3> ICG fluorescence demonstrates high sensitivity and NPV in detecting fibrosis and inflammatory change which is also significantly associated with histopathological evidence of endometriosis. These findings support the growing literature that propose that fibrosis and inflammatory changes are inherently related to the natural history and pathogenesis of endometriosis. These findings may suggest that the presence of fibrosis in the absence of glands and stroma on histopathology does not definitively rule out a diagnosis of endometriosis. More studies are needed to further elucidate the role of ICG in detecting changes related to the pathogenesis of endometriosis.

Impact of operation duration on postoperative outcomes of minimally-invasive right colectomy.

Operation time (OT) is a key operational factor influencing surgical outcomes. The present study aimed to analyse whether OT impacts on short-term outcomes of minimally-invasive right colectomies by assessing the role of surgical approach (robotic [RRC] or laparoscopic right colectomy [LRC]), and type of ileocolic anastomosis (i.e., intracorporal [IA] or extra-corporal anastomosis [EA]). This was a retrospective analysis of the Minimally-invasivE surgery for oncological Right ColectomY (MERCY) Study Group database, which included adult patients with nonmetastatic right colon adenocarcinoma operated on by oncological RRC or LRC between January 2014 and December 2020. Univariate and multivariate analyses were used. The study sample was composed of 1549 patients who were divided into three groups according to the OT quartiles: (1) First quartile, <135 min (n=386); (2) Second and third quartiles, 135-199 min (n=731); and (3) Fourth quartile ≥200 min (n=432). The majority (62.7%) were LRC-EA, followed by LRC-IA (24.3%), RRC-IA (11.1%), and RRC-EA (1.9%). Independent predictors of an OT ≥ 200 min included male gender, age, obesity, diabetes, use of indocyanine green fluorescence, and IA confection. An OT ≥ 200 min was significantly associated with an increased risk of postoperative noninfective complications (AOR: 1.56; 95% CI: 1.15-2.13; p=0.004), whereas the surgical approach and the type of anastomosis had no impact on postoperative morbidity. Prolonged OT is independently associated with increased odds of postoperative noninfective complications in oncological minimally-invasive right colectomy.

Indocyanine Green Fluorescence Guided Resection of Neuroendocrine Liver Metastases: A Proof-of-Concept Study

Introduction: Even though the relative indolent character of neuroendocrine neoplasms, unresected neuroendocrine liver metastases (NELM) have a detrimental impact on survival outcomes. Therefore, complete resection should always be considered if technically possible. The aim of this study was to assess the value of fluorescence guided surgery with indocyanine green (ICG) to resect NELM. Methods: This is a proof-of-concept study including patients who underwent resection of NELM of any grade. Patients who underwent liver resection for other tumour types (colorectal liver metastases, CRLM and hepatocellular carcinoma, HCC) were included to compare ICG uptake. Patients received a bolus infusion of 10 mg ICG approximately 24 hours prior to surgery. Resection of liver metastases were performed using guidance of fluorescence cameras and intra-operative ultrasonography. All resected lesions underwent histopathological assessment by an expert pathologist. Results: Six patients were included in the study: three with NELM, two with CRLM and one with HCC. Five patients underwent a minimally invasive liver resection, and had uptake of ICG in the liver metastases. Uptake of ICG was both homogenous and “rim-shaped” in NELM. A resection was not performed in one patient with NELM, due to unforeseen bilobar metastases. There were no adverse events related to use of ICG fluorescence. All resection margins were negative (R0). Conclusion: This is to our knowledge the first proof-of-concept study describing ICG fluorescence guided resection of NELM. Fluorescence guided resection of NELM using ICG was possible, and uptake of ICG by NELM is comparable to CRLM and HCC.

Laparoscopic lymph node biopsy for lymphoma with a novel use of indocyanine green fluorescence in a 66-year-old male patient.

IntroductionIndocyanine green (ICG) near-infrared fluorescence is primarily employed in detecting Intraoperative sentinel lymph node (SLN) mapping or to evaluate the extent of radical lymphadenectomy mainly in colo-rectal and gastric cancer. To date there are no reports indicating the use of this dye to detect pathologic lymphatic tissue when a lymph node biopsy for suspected lymphoproliferative disease is performed.Presentation of caseA 66-year-old male patient was admitted to the hospital for severe pain of left renal colic type. A computed tomography (CT) scan and a positron emission tomography (PET) showed a left hydroureteronephrosis due to ureter compression by paraortic solid tissue of lymphomatous aspect with a standardized uptake value (SUV) of 15. Multiple lymphadenopathies on paracaval, para-aortic and common iliac sites were present as well.DiscussionA laparoscopic lymph node biopsy (LLB) was planned for diagnostic purposes. After induction of anesthesia a ICG solution was injected Intradermally at both inguinal regions. At laparoscopy a complete visualization of the pathologic lymphnodes was achieved, enabling incisional biopsies of the lymphomatous mass. Histopathological examination showed an extranodal localization of an aggressive B-cell non-Hodgkin lymphoma.ConclusionICG-fluorescence seems to offer a simple and safe method for pathologic lymph node detection. LLB in the suspicion of intra abdominal lymphoma can largely take advantage by this novel opportunity not yet tested to date. More studies with large case series are needed to confirm the efficacy of ICG-fluorescence for detecting pathologic lymph nodes.

Intraoperative use of indocyanine green fluorescence imaging in rectal cancer surgery: The state of the art.

Indocyanine green (ICG) fluorescence imaging is widely used in abdominal surgery. The implementation of minimally invasive rectal surgery using new methods like robotics or a transanal approach required improvement of optical systems. In that setting, ICG fluorescence optimizes intraoperative vision of anatomical structures by improving blood and lymphatic flow. The purpose of this review was to summarize all potential applications of this upcoming technology in rectal cancer surgery. Each type of use has been separately addressed and the evidence was investigated. During rectal resection, ICG fluorescence angiography is mainly used to evaluate the perfusion of the colonic stump in order to reduce the risk of anastomotic leaks. In addition, ICG fluorescence imaging allows easy visualization of organs such as the ureter or urethra to protect them from injury. This intraoperative technology is a valuable tool for conducting lymph node dissection along the iliac lymphatic chain or to better identifying the rectal dissection planes when a transanal approach is performed. This is an overview of the applications of ICG fluorescence imaging in current surgical practice and a synthesis of the results obtained from the literature. Although further studies are need to investigate the real clinical benefits, these findings may enhance use of ICG fluorescence in current clinical practice and stimulate future research on new applications.

The Utility of Indocyanine Green Dye Fluorescence Lymphography and Angiography During Wide Excision of Cutaneous Melanoma.

Background and Objectives. Lymph node status is the most important prognostic factor in cutaneous melanoma patients. Recent studies showed that indocyanine green (ICG) fluorescence lymphography helps locating sentinel nodes better. Sometimes, flap reconstruction is needed after wide excision of tumor. Indocyanine green fluorescence also simplifies the intraoperative design of flaps. This study investigates the use of ICG fluorescence in patients with cutaneous melanoma during operation. Methods. We performed a single-center, retrospective study of subjects with cutaneous melanoma using ICG lymphograhy and/or angiography during wide excision of tumor between 2015 and 2019. Patients received a dermal injection of ICG and patent blue (PB) dye. The positive node was excised. Indocyanine green angiography was utilized to visualize better skin paddle during flap reconstruction if needed. Results. A total of 37 sentinel lymph nodes (SLNs) were removed in 12 patients. Indocyanine green successful localization was found in 10 of the 12 patients (83%). Three patients were found with 6 metastatic nodes on final pathology. 100% of these 6 nodes were identified by ICG, while 83% (5/6) were positive PB. Three of the 12 patients received flap reconstruction after operation, and no major complications occurred. Conclusions. ICG dye lymphangiography is a good alternative for locating SLNs in patients with melanoma. It could also visualize well perfusion skin paddle during reconstruction. We reported a reproducible and simple method to utilize ICG fluorescence in cutaneous melanoma patients.

Retroperitoneoscopic Cortical Sparing Adrenalectomy with Indocyanine Green Fluorescence

Abstract Introduction: Indocyanine green (ICG) is a water-soluble fluorophore that binds albumin and exhibits fluorescence in the near-infrared (NIR) spectrum. The use of ICG fluorescence in adrena...

The use of indocyanine green fluorescence to define bowel microcirculation during laparoscopic surgery for acute small bowel obstruction.

Although there is growing evidence to support the feasibility of a minimally invasive approach for acute small bowel obstruction, the inability to adequately evaluate compromised bowel segments has been cited as a major limitation. The aim of this work is to report a novel application of extemporaneous indocyanine green (ICG) fluorescence to assess bowel viability where there is a concern for ischaemic damage. After the cause of obstruction has been identified and resolved, and where there are dubious signs of bowel ischaemia present, fluorescent selective angiography is undertaken. The segment of bowel in question is observed under both normal and fluorescent light to assess local microcirculation. The adequacy of both the arterial supply and the venous drainage is thus appraised to define bowel viability. Among 71 patients who have undergone surgery for acute small bowel obstruction with a laparoscopic approach, seven received extemporaneous ICG fluorescence assessment of bowel viability. Different presentations with their relevant management are described. Selective use of intraoperative fluorescent angiography may overcome some of the intrinsic limitations of laparoscopy in assessing bowel viability during surgery for acute small bowel obstruction.

Intraoperative Use of Indocyanine Green Fluorescence in Hepatobiliary and Pancreatic Cancer Resections: Current State and Considerations

Introduction: Surgery for hepatobiliary and pancreatic malignancies often has unfavourable outcomes due to incomplete resection, with positive histopathological margins and locoregional metastases. Intraoperative use of indocyanine green fluorescence (ICG) with near-red infrared light can improve tumor detectability and achieve R0 status. Methods: Review of current literature. Results: ICG fluorescence and bile excretion allows for real-time visualisation of malignant tissues and assessment of resection margins. In liver surgery it can identify subcapsular lesions, a property especially useful in minimally invasive surgery where there is loss of tactile feedback and direct visual inspection. It can also delineate hepatic segmental anatomy for anatomical resections. Hepatocellular carcinomas tend to uniformly uptake ICG, whereas primary or metastatic adenocarcinomas like cholangiocarcinomas and colorectal liver metastases as well as poorly differentiated hepatocellular carcinomas show rim enhancement. In pancreatic cancer, fluorescence of the resection margin has been shown to correspond to presence of malignancy on histopathological assessement. ICG can also help to detect micrometastases and extrahepatic spread and distinguish between scar tissue and disease following neoadjuvant chemoradiotherapy. However the technique has limitations: wide variability of method and dose of administration, no visualisation of deep seated lesions, high background fluorescence, false positives up to 40% requiring additional verification by other modalities like intraoperative ultrasound or frozen section for newly detected lesions. Conclusion: ICG fluorescence can offer increased detectability of malignancy and improve post-operative outcomes in hepatobiliary and pancreatic resections. However there are limitations such as superficial depth of detection and low specificity which need improvement to achieve maximum benefit.

Neovagina creation in congenital vaginal agenesis: New mini-laparoscopic approach applying intraoperative indocyanine green fluorescence.

Background. There is still no standardized treatment for vaginal agenesis; surgical repair using a minimally invasive technique is a good option, as it offers rapid results along with a fast postoperative recovery. Objective. To describe a new modified Vecchietti procedure by a mini-laparoscopic approach with intraoperative use of indocyanine green fluorescence technology for the creation of a neovagina in the setting of congenital vaginal agenesis. Methods. Retrospective review of all cases of congenital vaginal agenesis submitted to a mini-laparoscopic modified Vecchietti procedure with intraoperative use of indocyanine green (ICG) fluorescence (between June and September 2019). Patient relevant medical history, surgical technique, postoperative care, outcomes, and complications are described. Results. Four patients with Mayer-Rokitansky-Küster-Hauser syndrome (mean age: 19 years; mean preoperative vaginal length: 1.5cm) were included in the study. The procedure was completed successfully and uneventfully in all patients. External traction device was removed 5-7days after surgery and replaced by external vaginal silicone dilators. This technique was able to create 10-11cm neovaginas in 1week; six weeks after surgery all patients had an epithelized 10.5-12cm length and 2.5-3cm diameter neovagina. Complications consisted of one case of isolated fever at the ninth postoperative day, solved with empiric antibiotic treatment. Conclusion. The mini-laparoscopic modified Vecchietti approach, associated with ICG fluorescence imaging, is feasible and effective in the treatment of congenital vaginal agenesis, as it is a simple and safe procedure with promising outcomes.

Use of indocianine green fluorescence in acute mesenteric ischemia

Introducción: La isquemia mesentérica aguda presenta una elevada morbi-mortalidad y constituye un reto intraoperatorio en el manejo de las áreas isquémicas. En este contexto, analizamos el uso de la fluorescencia con verde de indocianina para valorar la vascularización intestinal a través de 3 casos clínicos. Presentación de los casos: presentamos 3 casos clínicos intervenidos por isquemia mesentérica aguda. Se realiza valoración de la viabilidad intestinal bajo luz infrarroja tras la infusión endovenosa de 25 mg de verde de indocianina. El caso 1 es un varón de 42 años con múltiples antecedentes de enfermedad vascular grave, que presenta una isquemia mesentérica aguda masiva con afecación parchaeada de múltiples segmentos intestinales. La fluorescencia permite la realización de dos resecciones intestinales ajustadas con doble anastomosis intestinal. El caso 2 es una mujer de 74 años con antecedentes de fibrilación auricular no anticoagulada a la que se le decide realizar una cirugía urgente al objetivarse una neumatosis esofágica, gástrica y en sistema porta, como signos indirectos de isquemia, en la TAC urgente. Durante el acto quirúrgico se halla una isquemia de ileon terminal y colon derecho sin claros signos de afectación a nivel esófago-gástrico. La valoración tras administración de ICG discrimina la clara afectación isquémica desde ileon terminal a colon ascendente y parcheada en colon transverso e izquierdo, sin afectación esofágica ni gástrica. El caso 3 es una mujer de 49 años con enfermedad de Takayasu aortoilíaca y visceral y cirugía de revascularización del tronco celíaco. Ante el aumento del dolor abdominal, una nueva TAC evidencia neumatosis colónica. La laparotomía urgente muestra necrosis a nivel del colon izquierdo e hipoperfusión del ciego. La administración de ICG halla una falta de captación de todo el colon. Se realiza una colectomía subtotal con ileostomía y fístula mucosa. Conclusiones: La fluorescencia con ICG aporta una mejor visualización de la vascularización intestinal en la IMA, y permite determinar los límites del tejido afecto para realizar resecciones ajustadas.

Use of indocyanine green fluorescence during hepatobiliary surgery

Background: Indocyanine green fluorescence image has been used in hepatobiliary surgery, which was mainly started by Japanese surgeons to visualize hepatobiliary structures probably because it is regarded as a reagent for estimation of hepatic function.&#x0D; Objectives: The objective of this study is to see the feasibility of use of indocyanine green in our setting during hepatobiliary surgery and its potential applications in the surgical treatment of benign and malignant liver pathology along with its selective use during difficult cholecystectomy to visualize extrahepatic biliary radical. &#x0D; Methodology: This is a prospective cross sectional observational study performed including all consecutive patients who were posted for liver resection, both benign or malignant and selectively used in biliary surgery when biliary anatomy was uncertain. &#x0D; &#x0D; Results: A total of thirty-nine patients had usage of indocyanine green, with a mean age of 51.6 ± 11.6 years (range, 31-75 years). In all our patients we were able to visualize the biliary system and liver parenchymal lesion.In the selective use of indocyanine green during difficult biliary anatomy during laparoscopic cholecystectomy 15/400 (3.75%), we were able to delineate biliary tree and hence five patients (1.2%) had to be converted to open cholecystectomy further preventing injury to the bile duct.&#x0D; Conclusion: Indocyanine green fluorescence imaging can be used safely and easily to identify liver tumors, hepatic segments, and extrahepatic bile ducts in real time during open and minimally invasive surgery. This allows surgeons to map the anatomical variations, status of resection margin and prevent surgical complications.