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HOME > Ann Coloproctol > Volume 37(3); 2021 > Article
Review
 Multifunctional Indocyanine Green Applications for Fluorescence-Guided Laparoscopic Colorectal Surgery
Gyung Mo Son1,2,3orcid, Hong-min Ahn1, In Young Lee2,3, Gi Won Ha4
Annals of Coloproctology 2021;37(3):133-140.
DOI: https://doi.org/10.3393/ac.2021.05.07
Published online: June 9, 2021

1Department of Surgery, Pusan National University Yangsan Hospital, Yangsan, Korea

2Research Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Yangsan, Korea

3Medical Research Center, Pusan National University School of Medicine, Yangsan, Korea

4Research Institute of Clinical Medicine of Jeonbuk National University-Biomedical Research Institute of Jeonbuk National University Hospital, Jeonju, Korea

Correspondence to: Gyung Mo Son, M.D. Department of Surgery, Pusan National University Yangsan Hospital, 20 Geumo-ro, Mulgeum-eup, Yangsan 50612, Korea Tel: +82-55-360-2124, Fax: +82-55-360-2154 E-mail: skm1711@pusan.ac.kr
• Received: February 22, 2021   • Revised: April 29, 2021   • Accepted: May 7, 2021

Copyright © 2021 The Korean Society of Coloproctology

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • Indocyanine green (ICG) could be applied for multiple functions such as fluorescent tumor localization, fluorescence lymph node mapping (FLNM), and intraoperative angiography in colorectal cancer surgery. With the near-infrared (NIR) systems, colonoscopic ICG tattooing can be used to define the early colorectal cancer that cannot be easily distinguished through the serosal surface. The lymphatic pathways can be visualized under the NIR system when ICG is injected through the submucosal or subserosal layer around the tumor. Intraoperative ICG angiography can be applied to find a favorable perfusion segment before the colon transection. Although all fluorescence functions are considered essential steps in image-guided surgery, it is difficult to perform multifunctional ICG applications in a single surgical procedure at once because complex protocols could interfere with each other. Therefore, we review the multifunctional ICG applications for fluorescent tumor localization, FLNM, and ICG angiography. We also discuss the optimal protocol for fluorescence-guided colorectal surgery.
  • Keywords: Tattooing; Fluorescent dyes; Fluorescein angiography; Laparoscopy; Colorectal neoplasms
Colorectal cancer is one of the most common gastrointestinal cancer. Laparoscopic and robotic surgeries are performed increasingly with the advance of surgical technique and the development of surgical device technology. However, the localization of early-stage colorectal cancer is still challenging in the field of minimally invasive surgery without tactile sensation [1]. To localize the small tumor, many intraoperative navigation methods have been introduced, including intraoperative ultrasound and preoperative endoscopic tattooing [2].
Indocyanine green (ICG) is a tricarbocyanine iodide dye molecule that is amphiphilic, relatively nontoxic. ICG is the only safe fluorescence agent approved by the U.S. Food and Drug Administration (FDA) for usage in clinical applications. ICG can be used either intravenous or tissue-directed injections. Intravenously injected ICG rapidly binds to plasma proteins, such as albumins, globulins, and lipoproteins, thus approximately 95% to 98% of ICG remains within the bloodstream [3].
In colorectal cancer surgery, ICG could be applied for multiple functions such as fluorescent tumor localization, fluorescence lymph node mapping (FLNM), and intraoperative angiography for image-guided surgery [3-5]. With the near-infrared (NIR) imaging systems, the ICG can be used to localize the early colorectal cancer site that cannot be easily distinguished through the serosal surface, especially after endoscopic mucosal resection or submucosal dissection [6]. The lymphatic pathways can be also visualized under the NIR image system when ICG is injected through the submucosal or subserosal layer around the tumor [7, 8]. Intraoperative ICG angiography could be applied to find a favorable perfusion segment before the colon transection. By facilitating the perfusion at the anastomosis, ischemia-related anastomotic complications could be prevented [9].
Even though all of ICG fluorescence functions, including tumor localization, lymph node mapping, and intraoperative angiography, can be considered as essential steps in the image-guided surgery, it is difficult to perform multifunctional ICG applications in a single surgical procedure at once because complex and unstandardized ICG protocols can interfere with each other. Conventional ICG tattooing protocol is useful for tumor localization through the naked eye exploration, but unsuitable for fluorescence-guided surgery because conventional ICG dosage is usually more than 25 mg that emits fluorescence in the entire intraperitoneal cavity under the NIR camera image. In this situation, ICG could not be used for intraoperative angiography or FLNM. Preoperative ICG tattooing protocols vary between facilities and surgeons and there is still a lack of research on the standardized ICG tattooing protocol for multifunctional applications in fluorescence-guided laparoscopic colorectal surgery.
This study aimed to review the multifunctional ICG applications for fluorescent tumor localization, ICG angiography, and FLNM within a single surgery and discuss the optimal protocol for fluorescence-guided laparoscopic colorectal surgery.
Fluorescent tumor localization
In our facility, patients are admitted to our facility 2 days before surgery for preoperative colonoscopic ICG tattooing. The endoscopic submucosal tattooing is performed 16 to 18 hours before surgery. Diluted ICG solution (0.25 mg/mL) is directly injected into the submucosal layer of the colon or rectum that was slightly distal to the tumor. The submucosal ICG injection (0.25 mg/mL, 1 mL) is administered at 2 or more different sites close to the distal side of cancer by an endoscopist. After the trocar insertion, the tumor localization is evaluated in the white light view of the laparoscopic camera, and the gross localization of blue-colored tattooing lesion is explored at first. Using the same aspect, the NIR camera is changed to ICG image mode to identify the fluorescent tumor localization. There are 3 different kinds of laparoscopic fluorescence imaging systems: Stryker (1588 AIM camera system, Stryker, Kalamazoo, MI, USA), Storz (IMAGE1 S, Karl Storz, Tuttlingen, Germany), and Olympus (CLV-S200-IR, Olympus, Tokyo, Japan). These NIR camera systems use different fluorescence emission sources. Stryker uses a laser as the light source, whereas the other 2 imaging systems use xenon lamps. The selection of NIR camera systems depended on the available instrument conditions on the day of surgery.
Fluorescence lymph node mapping using indocyanine green
FLNM is explored before initial lymph node dissection using the ICG image mode. The definite circular or crescent-shaped fluorescent lymph nodes could be found and that is considered as successful FLNM. Sometimes, we could meet no fluorescent lymph nodes as failed FLNM. During the radical D3 lymphadenectomy, the ICG stained lymph node might be placed on the extraterritorial area of the conventional D3 lymph node region, such as paraaortic nodes at that time, a surgeon must decide to extend lymph node dissection to remove extraterritorial ICG lymph nodes, such as en bloc resection or “berry picked” excision. After radical lymph node dissection is completed, the absence of any residual fluorescent lymph node is confirmed by using ICG mode of laparoscopic NIR camera.
In our facility, the submucosal ICG injection has been performed a day before surgery with preoperative colonoscopy not only for tattooing the tumor but also for the FLNM. Comparing with other protocols such as intraoperative subserosal injection or direct injection into dentate line before the rectal cancer surgery, this method seems inconvenient for the patients, since extra procedures have to be performed before the surgery. Nevertheless, the submucosal injection of ICG via preoperative colonoscopy has greater advantages on accurate ICG instillation into the submucosal layer and performing multifunctional applications of ICG. In our recent study, reduced ICG tattooing dosage let cancer be visualized clearly by the NIR system [10]. In addition, performing the FLNM and intraoperative ICG angiography may not be disturbed with surrounding ICG stained tissues.
Intraoperative ICG angiography
Intraoperative ICG angiography is performed to define a favorable perfusion segment before colon transection. The diluted ICG is prepared by the anesthesiologist as the dilution of ICG (25 mg) in 10 mL of distilled water. The patient’s body weight-adjusted ICG dosage (0.05 mg/kg) is injected slowly for 10 seconds. Colonic fluorescence intensity is monitored for 2 minutes after the intravenous ICG injection using the ICG mode of the laparoscopic NIR camera [7]. The ICG angiography could be performed either on the inside or outside the abdomen with “dark” surrounding conditions without room lighting. The optimal distance between the NIR camera lens and colon is considered as 4 to 5 cm for quantitative perfusion analysis [11]. The distance between the NIR camera lens and colon can be easily measured using the surgical paper ruler. Measurement of the reflection distance of laser is technically possible but is not yet commercially compatible with the surgical device. Usually, when the short axis of the colon is half of the monitor screen, the distance with the camera is maintained at 4 to 5 cm for optimal fluorescence intensity.
Optimal indocyanine green tattooing dosage for tumor localization and fluorescence lymph node mapping
ICG is grossly a dark blue pigmented substance that is used for tumor tattooing. However, there is a lot of difficulty in observing blue-colored dye with the naked eye because ICG is easily washed out due to its small-sized molecular structure. Some previous studies reported ICG as less useful among other tattooing agents such as India ink with causing mucosal ulceration and inflammation [12, 13]. With the fluorescence property of ICG and the development of the surgical NIR camera system, the tumor location and lymph nodes can easily be visualized under ICG image mode even with the diluted dosage that makes the tumor be hardly seen under white lights [13].
All clinical functions of ICG such as tumor localization, FLNM, and ICG angiography could play important roles in laparoscopic colorectal surgery [14]. Nevertheless, ICG tattooing with the conventional ICG dosage (25–50 mg) makes it impossible to distinguish the colon from surrounding tissues under the NIR camera, which may lead to failed ICG angiography and fluorescence localization. To avoid interference with stained surrounding tissues, the ICG tattooing dosage should be suitably diluted for successful fluorescent tumor localization, FLNM, and ICG angiography. In our clinical experiences with almost 200 patients, we had reduced ICG tattooing dosage by diluting the concentrate, and measured success or failure on each application; fluorescent tumor localization, FLNM, and intraoperative ICG angiography. From the results, we could have established the optimal ICG tattooing protocol; preoperative endoscopic submucosal injection near the tumor at ICG dosage of 0.5 mg, which improve the success rate of FLNM without the interference of fluorescent tumor localization and ICG angiography [10].
Optimal indocyanine green angiography protocol
The intraoperative ICG angiography technique could show real-time colon perfusion status during laparoscopic or robotic surgery and that could help colorectal surgeons to detect ischemic change at the colonic anastomosis site before colon transection. There are many studies on the clinical effect of ICG angiography to predict the risk of hypoperfusion at the anastomosis and preventing effect of anastomotic leakage [3, 9, 15-22]. The colonic ICG angiography protocols were summarized in Table 1 [9, 15-22]. All studies used intravenous ICG and NIR systems. However, surrounding conditional factors such as distance and surrounding lighting were mostly omitted. Many conditional factors affect the fluorescence intensity during ICG angiography, so we need to establish the optimal protocol for standardization of ICG angiography.
Fluorescence emitting sources are diverse; xenon lamp, laser, and light-emitting diode. The lighting conditions of the surgical field or the location of video shooting, either the intraabdominal or the extraabdominal space, can also affect the fluorescence intensity. The distance between the target colon and the laparoscopic camera lens is considered to be the most important factor causing differences in fluorescence intensity. Thus, several conditions like the fluorescence light source, color processing mode, illumination of the operating room, and the distance from the camera are all critical factors affecting the fluorescence intensity [9].
In our in vitro study, the distance from the camera to the subject affects the fluorescence intensity inversely. In the quantitative analysis, the fluorescence intensity tends to decrease when the distance increased between the laparoscopic camera and ICG test tube. Interestingly, the fluorescence intensity graph pattern has an inflection point around 4 to 5 cm of distance. This transitional section could be considered as an optimal distance zone for ICG angiography. So, the best shooting distance is considered as 4 to 5 cm. Therefore, we are suggesting that 4 to 5 cm can be the optimal distance of ICG angiography for quantitative analysis [11].
In previous studies, ICG fluorescence has not been demonstrated to reduce anastomotic complications, but most studies have been based on the qualitative evaluation of ICG fluorescence in the colon wall or mucosa [23, 24]. ICG angiography has not been verified as a predictor of anastomotic complications because qualitative evaluation alone is limited in accurately distinguishing changes in the microcirculation of the large intestine. Quantitative blood flow analysis is necessary to measure the changes in colonic microcirculation to predict bowel viability [25]. The quantitative analysis of colonic perfusion is still rare in surgical practice. In recent quantitative studies, FMAX, T1/2MAX, and fluorescence slope were correlated with bowel viability or anastomotic leakage [26-28]. In our study, factors related to perfusion time, such as TMAX, T1/2MAX, and perfusion time ratio were analyzed as significant predictors of anastomotic complications [9].
Interestingly, conditional factors, including distance, surrounding lighting, and fluorescence emission source, significantly affect the quantitative parameters, especially FMAX, T1/2MAX, and Slope in our in vitro study. The standardization protocol of ICG angiography can improve the quality and consistency of quantitative analysis, and an optimized protocol with an optimal distance of 4 to 5 cm using ICG specific modes can be recommended [11].
When our laparoscopic ICG protocol was applied to robot surgery, we could obtain similar fluorescence images using the Firefly in the Da Vinci XI (Intuitive, Sunnyvale, CA, USA), which is installed in our institution. From this personal experience for robotic surgery, laparoscopic ICG fluorescence protocol could be applied directly to robot surgery, because the Firefly in the Da Vinci XI is the equipment provided by Novadaq (Stryker), which has essentially the same laser NIR camera system.
Fluorescence lymph node mapping
FLNM is a promising surgical application of image-guided surgery. When ICG is injected into the colonic wall, it spreads through the lymphatic drainage from the distal perivascular space with slow interstitial fluid reabsorption [29]. In colorectal cancer surgery, FLNM helps the surgeon visualize the lymphatic pathway to perform a more accurate dissection of the lymph nodes [30]. The patients’ body mass index (BMI) can affect the success of FLNM because higher BMI means more visceral fat tissue and that can disturb the fluorescence signals of lymph nodes that are covered with thick mesenteric fat tissue [10]. FLNM protocols have been introduced from previous studies and summarized in Table 2 [7, 8, 10, 31-41].
In the comparison study between the ICG FLNM group and the conventional group, the total number of harvested lymph nodes was significantly higher with FLNM [31]. Being able to visualize the lymph nodes and lymphatic drainage pathway, the surgeon can dissect lymph nodes much more radically. When a fluorescent lymph node is found in the extraterritorial area outside of the conventional radical dissection plane, a surgeon can extend the dissecting plane for complete fluorescence lymph node removal. From the oncological point of view, at least 12 lymph nodes should be retrieved to evaluate the pathologic stage of cancer, so that patients may receive proper chemotherapy after surgery. FLNM can be considered as one of the surgical tools for the retrieval of an adequate number of lymph nodes.
Although the total number of harvested lymph nodes was greater in the case of successful FLNM, there is no effect on the total number of metastatic lymph nodes in our study. The previous study on comparison of clinical outcomes between ICG-guided laparoscopic right hemicolectomy and conventional surgery have found that harvested lymph nodes were greater but no difference in metastatic lymph nodes by the ICG-guided surgery [42]. In other words, lymph node harvest is a function of pathology. Another possible explanation is that the pathologist took greater effort on ICG-labeled lymph nodes that the surgeon had isolated during surgery. The other possible explanation is that lymph nodes that might have been omitted by the conventional way were harvested with the help of visual aids. Thus, it can be suggested that FLNM helps harvest more lymph nodes than the conventional method. Therefore, the successful FLNM could be expected not only to help isolate more lymph nodes but also to effective pathologic isolation of D3 lymph nodes after radical lymphadenectomy [10].
However, FLNM using ICG has a fundamental limitation that has not yet been solved. FLNM would be a poor modality to identify metastatic lymph nodes. ICG binds to macrophages within the lymph nodes, but normal lymphoid tissues are replaced by the cancer cells in the metastatic lymph node. So, the metastatic lymph nodes would drain ICG less easily, that none or crescent-shaped fluorescence would appear under the NIR camera. In a recent study in Japan, they explored the metastatic lymph nodes under a microscopic NIR camera. Fluorescence did not emit light in the area occupied by cancer cells, and crescent-shaped fluorescence was observed in the node where some lymphoid tissue still has remained [43]. In advanced colorectal cancer, FLNM still has limitations in accuracy and reliability on creating cancer cell spreading pathways. The detection of the metastatic lymph nodes is still challenging for ICG FLNM. However, in early staged cancer, since ICG submucosal injection can be performed closer to the lesion, it is expected that FLNM will be possible as sentinel lymph node (SLN) mapping.
Sentinel lymph node mapping
The original concept of the SLN is the hypothetical lymph nodes to which primary cancer initially drains. In many fields of cancer, especially in breast cancer and malignant melanoma, ICG is used as one of the tools for detecting SLNs to minimize surgical procedures and prevent postoperative complications [44]. The SLN mapping has promising results in cervical cancer, endometrial cancer, and gastrointestinal cancer [32, 45]. So far, SLN mapping has been attempted using blue dye or radioisotope. However, the success rate of lymph node mapping did not meet expectations using blue dye. With radioisotope usage, radiation exposure and additional assistance from nuclear physicians were required. With the development of the surgical NIR camera system, the ICG lymph node mapping has been tried for the detection of SLNs [33, 46].
SLN mapping with ICG can be inaccurate because the lymph nodes are replaced with tumors and thus lymphatic flow drains less in the lymph node-positive patients. From the ICG FLNM, the pathway of lymph nodes that connected with the primary tumor, however, within metastatic lymph nodes, the lymphatic flow could be blocked by infiltrated cancer cells. This phenomenon is visually shown by metastatic lymph nodes with insufficient uptake of ICG, which forms none or crescent-shaped fluorescence. In early cancer, submucosal ICG injection can be performed close to the tumor without disturbance of lymphatic flow, ICG stained lymph node mapping could be interpreted as SLN mapping.
For in vivo SLN mapping, ICG is usually injected into a patient after anesthetic induction in the operating room. After 10 to 30 minutes of ICG injection, fluorescence expressing lymph nodes are identified and marked using clip or suture tie for later pathological sentinel node examination. Some researchers used ex vivo SLN mapping through subserosal injection of fluorescence dye. In the cases of ex vivo SLN mapping, other non-FDA-approved fluorescence agents, such as IRDye800CW (Li-Cor, Lincoln, NE, USA) can be injected into colon tissue. The colonic layer should be selected as a subserosal or submucosal layer for ICG injection. The subserosal ICG injection can be directly performed by a surgeon using a butterfly needle, but when the needle tip enters into the muscular propria, ICG solution could not be shooted and ICG spillage should cause ICG contamination in the abdominal cavity. The submucosal layer can be used through a colonoscopy, reducing the possibility of ICG spillage. It is important to consider the spread of ICG solution in the submucosal layer to most accurately reproduce the lymphatic flow of early colon cancer with submucosal invasion. On the meta-analysis, colon cancer was analyzed to be more suitable for SLN detection than rectal cancer [46]. Interestingly, a recent study reported that the staining lymph nodes of ICG and blue dye injected into the submucosal layer and subserosal layer, respectively, did not match. Since the lymphatic pathways of the submucosal layer and the subserosal layer are different, the submucosal injection would be appropriate to detect SLN in early colon cancer. The most important limitation of SLNM is the false-negative rates of more than 20% of lymph node metastasis. In colon cancer, the false-negative value of SLN mapping was associated with less than 3 SLNs and tumor-replaced lymph nodes. In addition, SLN mapping was successfully achieved in colon cancer than rectal cancer [47]. This association between the number of SLNs harvested and false-negative rates may be related to the different anatomic patterns of lymphatic drainage of the colon, the skin (melanoma), and the breast. While the lymphatic drainage is in conduit or funnel-shaped pattern passing through 1 or 2 sentinel nodes as first echelon lymph nodes in the skin or breast tissue, and metastatic cancer cells can be spreading into second and third echelon lymph nodes. But, the lymphatic drainage of the colon segment might be quite the opposite anatomical structure. A broad distributed base of lymphatics can be drained into a group of sentinel nodes as the first echelon lymph node, and then converging into 1 or 2 apical lymph nodes at the base of the mesenteric artery, which is considered as the typical drainage pattern of colonic lymphatics. Therefore, securing 3 or more SLNs in the first echelon lymph nodes is likely to be a prerequisite for SLN mapping to successfully proceed in future clinical studies for patients with early colon cancer [47].
Besides, the range of the lymph node dissection with FLNM is still undetermined in colorectal cancer surgery. The SLN mapping is still difficult to define in colorectal cancer, because of the dual lymphatic flow and existence of skipped lymph nodes.
There are still a lot of questions to be solved, but we believe that ICG FLNM could be one of the important methods for finding SLNs in the selected patients. Therefore, future ICG lymph node mapping studies will serve as the basis for establishing SLN mapping in early colon cancer.
The multifunctional ICG applications for fluorescent tumor localization, successful FLNM, and ICG angiography can be performed within a single surgery under a laparoscopic or robotic NIR-imaging system. The standardization of multifunctional ICG applications should be established for fluorescence-guided laparoscopic colorectal surgery.

CONFLICT OF INTEREST

No potential conflict of interest relevant to this article was reported.

This study was supported by a 2020 research grant from Pusan National University Yangsan Hospital.
Table 1.
The protocols of intraoperative ICG angiography
Reference Year No. of patients Types of surgery Intravenous dose of ICG Distance (cm) Extra-/intraabdominal angiography Fluorescence emission source Near-infrared system
Aiba et al. [15] 2020 110 Colorectal resection 0.1 mg/kg 5 Extraperitoneal Xenon OPAL1 (Karl Storz)
Benčurik et al. [16] 2020 100 Laparoscopic or robotic LAR 0.2 mg/kg NA Extraperitoneal Xenon SPIES (Karl Storz)
Laser Firefly (Intuitive)
Watanabe et al. [17] 2020 236 Laparoscopic LAR 0.25 mg/kg NA Extraperitoneal Xenon D-light P (Karl Storz)
Laser 1588 AIM (Stryker)
De Nardi et al. [18] 2020 240 Laparoscopic left-sided colorectal resection 0.3 mg/kg NA NA Xenon IMAGE1 (Karl Storz)
Son et al. [9] 2019 86 Laparoscopic AR or LAR 0.25 mg/kg NA Extra- or intraperitoneal Xenon IMAGE1 S (Karl Storz)
Ogino et al. [19] 2019 74 Colorectal surgery Bolus 5 mg 15 Extraperitoneal LED Photodynamic eye system (Hamamatsu Photonics)
Morales-Conde et al. [20] 2019 192 Colorectal surgery Bolus 15 mg 5 Extraperitoneal Xenon IMAGE 1S (Karl Storz)
Laser 1588 AIM (Stryker)
Chang et al. [21] 2019 110 NA Bolus 5 mg NA Extraperitoneal Laser SPY Elite System (Stryker)
Boni et al. [22] 2017 42 Laparoscopic LAR 0.2 mg/kg NA NA Xenon IMAGE1 (Karl Storz)

ICG, indocyanine green; LAR, low anterior resection; AR, anterior resection; LED, light-emitting diode; NA, not available.

Karl Storz, Tuttlingen, Germany; Intuitive, Sunnyvale, CA, USA; Stryker, Kalamazoo, MI, USA; Hamamatsu Photonics, Hamamatsu, Japan.

Table 2.
The protocols of fluorescence lymph node mapping
Reference Year No. of patients Dye Submucosal/subserosal ICG dosage (mg) Waiting time Lymph node (mean) SLN (mean) SLN assessment Fluorescence emission source Near-infrared system
Son et al. [10] 2021 192 ICG Submucosal 1 16–18 hr 33.3 NA In vivo Laser/xenon 1588 AIM (Stryker)/IMAGE1 (Karl storz)
Park et al. [31] 2020 25 ICG Submucosal 2.5–10 3–24 hr 41.0 NA In vivo Xenon D-light P (Karl storz)
Ankersmit et al. [34] 2019 30 ICG Submucosal/subserosal 20 3-10 min 13.0 3.5 In vivo Xenon NIR-imaging system (Olympus)
Currie et al. [35] 2017 30 ICG Submucosal 2.5 7 min 34.0 3.0 In vivo Xenon NIR-imaging system (Olympus)
Andersen et al. [36] 2017 29 ICG Subserosal 5 20 min 24.0 1.0 In vivo/ex vivo Xenon SPIES (Karl storz)
Weixler et al. [37] 2017 50 IRD Subserosal 6 NA 17.5 10.4 Ex vivo Laser Mini-FLARE
Watanabe et al. [38] 2016 20 ICG Subserosal 2 30 min 17.5 10.4 In vivo Xenon D-light P (Karl storz)
Liberale et al. [39] 2016 12 ICG Subserosal 2 152 min 22.4 1.5 Ex vivo LED Photodynamic eye system (Hamamatsu Photonics)
Schaafsma et al. [40] 2013 22 IRD Submucosal 4 NA 20.5 3.5 Ex vivo Laser Mini-FLARE
Hirche et al. [33] 2012 26 ICG Subserosal 5–20 3-10 min 32.9 1.7 In vivo Xenon IC-view (Pulsion Medical System)
Cahill et al. [7] 2012 18 ICG Submucosal 5–7.5 NA NA 3.6 In vivo Xenon CE approved device (Olympus)
Hutteman et al. [41] 2011 19 IRD Submucosal 1 NA 16.2 3.2 Ex vivo Laser Mini-FLARE
Noura et al. [32] 2010 25 ICG Submucosal 5 30 min NA 2.1 In vivo LED Photodynamic eye system (Hamamatsu Photonics)
Kusano et al. [8] 2008 26 ICG Subserosal NA NA NA 2.4 In vivo LED Photodynamic eye system (Hamamatsu Photonics)

ICG, indocyanine green; IRD, IRDye800CW; SLN, sentinel lymph node; CE, Conformite Europeenne; NA, not available.

Karl Storz, Tuttlingen, Germany; Olympus, Tokyo, Japan; Pulsion Medical System, Feldkirchen, Germany; Hamamatsu Photonics, Hamamatsu, Japan.

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Figure & Data

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      Multifunctional Indocyanine Green Applications for Fluorescence-Guided Laparoscopic Colorectal Surgery
      Ann Coloproctol. 2021;37(3):133-140.   Published online June 9, 2021
      DOI: https://doi.org/10.3393/ac.2021.05.07
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    Multifunctional Indocyanine Green Applications for Fluorescence-Guided Laparoscopic Colorectal Surgery
    Multifunctional Indocyanine Green Applications for Fluorescence-Guided Laparoscopic Colorectal Surgery
    Reference Year No. of patients Types of surgery Intravenous dose of ICG Distance (cm) Extra-/intraabdominal angiography Fluorescence emission source Near-infrared system
    Aiba et al. [15] 2020 110 Colorectal resection 0.1 mg/kg 5 Extraperitoneal Xenon OPAL1 (Karl Storz)
    Benčurik et al. [16] 2020 100 Laparoscopic or robotic LAR 0.2 mg/kg NA Extraperitoneal Xenon SPIES (Karl Storz)
    Laser Firefly (Intuitive)
    Watanabe et al. [17] 2020 236 Laparoscopic LAR 0.25 mg/kg NA Extraperitoneal Xenon D-light P (Karl Storz)
    Laser 1588 AIM (Stryker)
    De Nardi et al. [18] 2020 240 Laparoscopic left-sided colorectal resection 0.3 mg/kg NA NA Xenon IMAGE1 (Karl Storz)
    Son et al. [9] 2019 86 Laparoscopic AR or LAR 0.25 mg/kg NA Extra- or intraperitoneal Xenon IMAGE1 S (Karl Storz)
    Ogino et al. [19] 2019 74 Colorectal surgery Bolus 5 mg 15 Extraperitoneal LED Photodynamic eye system (Hamamatsu Photonics)
    Morales-Conde et al. [20] 2019 192 Colorectal surgery Bolus 15 mg 5 Extraperitoneal Xenon IMAGE 1S (Karl Storz)
    Laser 1588 AIM (Stryker)
    Chang et al. [21] 2019 110 NA Bolus 5 mg NA Extraperitoneal Laser SPY Elite System (Stryker)
    Boni et al. [22] 2017 42 Laparoscopic LAR 0.2 mg/kg NA NA Xenon IMAGE1 (Karl Storz)
    Reference Year No. of patients Dye Submucosal/subserosal ICG dosage (mg) Waiting time Lymph node (mean) SLN (mean) SLN assessment Fluorescence emission source Near-infrared system
    Son et al. [10] 2021 192 ICG Submucosal 1 16–18 hr 33.3 NA In vivo Laser/xenon 1588 AIM (Stryker)/IMAGE1 (Karl storz)
    Park et al. [31] 2020 25 ICG Submucosal 2.5–10 3–24 hr 41.0 NA In vivo Xenon D-light P (Karl storz)
    Ankersmit et al. [34] 2019 30 ICG Submucosal/subserosal 20 3-10 min 13.0 3.5 In vivo Xenon NIR-imaging system (Olympus)
    Currie et al. [35] 2017 30 ICG Submucosal 2.5 7 min 34.0 3.0 In vivo Xenon NIR-imaging system (Olympus)
    Andersen et al. [36] 2017 29 ICG Subserosal 5 20 min 24.0 1.0 In vivo/ex vivo Xenon SPIES (Karl storz)
    Weixler et al. [37] 2017 50 IRD Subserosal 6 NA 17.5 10.4 Ex vivo Laser Mini-FLARE
    Watanabe et al. [38] 2016 20 ICG Subserosal 2 30 min 17.5 10.4 In vivo Xenon D-light P (Karl storz)
    Liberale et al. [39] 2016 12 ICG Subserosal 2 152 min 22.4 1.5 Ex vivo LED Photodynamic eye system (Hamamatsu Photonics)
    Schaafsma et al. [40] 2013 22 IRD Submucosal 4 NA 20.5 3.5 Ex vivo Laser Mini-FLARE
    Hirche et al. [33] 2012 26 ICG Subserosal 5–20 3-10 min 32.9 1.7 In vivo Xenon IC-view (Pulsion Medical System)
    Cahill et al. [7] 2012 18 ICG Submucosal 5–7.5 NA NA 3.6 In vivo Xenon CE approved device (Olympus)
    Hutteman et al. [41] 2011 19 IRD Submucosal 1 NA 16.2 3.2 Ex vivo Laser Mini-FLARE
    Noura et al. [32] 2010 25 ICG Submucosal 5 30 min NA 2.1 In vivo LED Photodynamic eye system (Hamamatsu Photonics)
    Kusano et al. [8] 2008 26 ICG Subserosal NA NA NA 2.4 In vivo LED Photodynamic eye system (Hamamatsu Photonics)
    Table 1. The protocols of intraoperative ICG angiography

    ICG, indocyanine green; LAR, low anterior resection; AR, anterior resection; LED, light-emitting diode; NA, not available.

    Karl Storz, Tuttlingen, Germany; Intuitive, Sunnyvale, CA, USA; Stryker, Kalamazoo, MI, USA; Hamamatsu Photonics, Hamamatsu, Japan.

    Table 2. The protocols of fluorescence lymph node mapping

    ICG, indocyanine green; IRD, IRDye800CW; SLN, sentinel lymph node; CE, Conformite Europeenne; NA, not available.

    Karl Storz, Tuttlingen, Germany; Olympus, Tokyo, Japan; Pulsion Medical System, Feldkirchen, Germany; Hamamatsu Photonics, Hamamatsu, Japan.

    Table 1.

    Table 2.

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