Fluorescent Dye Use for Bile Duct Identification in Gallbladder Surgery

Fluorescent dye imaging is an important advancement in safety improvement during gallbladder surgery, especially laparoscopic cholecystectomy. One of the most serious complications of this procedure is bile duct injury, which can cause serious morbidity, prolonged hospitalization, and long-term complications like strictures or liver dysfunction. Traditional identification of biliary anatomy relies on visual inspection and the “critical view of safety” technique. However, inflammation, obesity, or anatomical variation can obscure structures. The use of near-infrared (NIR) fluorescent dyes, most commonly indocyanine green (ICG), enhances real-time visualization of the biliary tree and reduces the risk of misidentification.

Indocyanine green is a water-soluble fluorescent dye that binds to plasma proteins after IV injection and is excreted solely into bile without going through the process of metabolism. When illuminated with near-infrared light, ICG emits fluorescence that can be detected by specialized laparoscopic imaging systems, allowing surgeons to visualize the cystic duct, common bile duct, and common hepatic duct in real time (Ishizawa et al., 2010). Because ICG fluorescence penetrates tissue more effectively than visible light, it enables identification of biliary structures even when partially obscured by fat or inflammation.

Clinical studies have shown that fluorescent cholangiography using ICG improves biliary anatomy identification rates compared to white light visualization alone. In a meta-analysis, Dip et al. Dip et al. (2014) reported that NIR fluorescence significantly enhanced detection of the cystic duct and common bile duct during laparoscopic cholecystectomy. This improved visualization supports safer dissection and may reduce the incidence of bile duct injury. Additionally, fluorescent imaging avoids radiation exposure associated with conventional intraoperative cholangiography, offering a safer and more efficient alternative (Pesce et al., 2018).

Beyond safety benefits, fluorescent dye imaging is relatively simple to implement. ICG is administered intravenously prior to surgery, typically 30–120 minutes before incision, and the technique integrates seamlessly into minimally invasive workflows. The dye has a strong safety profile, with rare adverse reactions, making it suitable for widespread clinical use. However, limitations include reduced signal intensity in patients with severe hepatic dysfunction and limited tissue penetration depth compared to radiographic techniques.

In conclusion, the use of fluorescent dyes such as indocyanine green for bile duct identification represents a significant advancement in gallbladder surgery. By enhancing real-time visualization of biliary anatomy, this technology improves surgical precision, reduces complications, and promotes patient safety. As imaging systems continue to improve and clinical evidence expands, fluorescent cholangiography is likely to become a standard adjunct in laparoscopic cholecystectomy.

Written by Saket Parayil at Incisionary

References

Dip, F., Roy, M., Lo Menzo, E., Simpfendorfer, C., Szomstein, S., & Rosenthal, R. J. (2014). Routine use of fluorescent incisionless cholangiography as a new imaging modality during laparoscopic cholecystectomy. Surgical Endoscopy, 28(5), 1621–1626. https://doi.org/10.1007/s00464-013-3377-9

Ishizawa, T., Bandai, Y., Ijichi, M., Kaneko, J., Hasegawa, K., & Kokudo, N. (2010). Fluorescent cholangiography illuminating the biliary tree during laparoscopic cholecystectomy. British Journal of Surgery, 97(9), 1369–1377. https://doi.org/10.1002/bjs.7093

Pesce, A., Piccolo, G., La Greca, G., & Puleo, S. (2018). Utility of fluorescent cholangiography during laparoscopic cholecystectomy: A systematic review. World Journal of Gastroenterology, 24(27), 2922–2930. https://doi.org/10.3748/wjg.v24.i27.2922