Introduction
Various contrasts and dyes are used in the diagnosis and treatment procedures like surgery. They are used to show they can mark the region made in the treatment. Fistulas tumors regions leakages and my nude delegates structure internal organs can be detected using these dice. One such vital dye is ICG (Indocyanine green) which helps in increasing the surgical outcome. Visualization using fluorescence imaging is a new year technology used to perform visible surgery. Due to its ease of use, safety, and relatively low cost, it is a reliable method.
What Is ICG?
ICG (Indocyanine green) is a water-soluble, non-toxic, and stable dye used in visceral surgeries. Adverse reactions occur rarely; the most minor allergies can be due to iodine allergy. It can be used in neurosurgery, ophthalmology, and cardiology but is now limited to estimating blood supply to the tissue. It can be used in many fields of general surgery especially colorectal surgery (surgery of the lower gastrointestinal tract), kidney transplantation, endocrine surgery, and esophageal surgery.
What Is Visceral Surgery?
Viscera include large internal organs present in the body, and visceral surgery is a specialized branch of general surgery dealing with surgeries of visceral organs. It treats the deformity and disorders of the visceral organs and memory glands through surgical intervention. Tumors in the visceral organs and hemorrhoids (piles, swollen veins near the anus) removed with laparoscopic intervention are also involved in visceral surgery. An endoscope is the main instrument used in visceral surgery that helps visualize internal structures.
How Is ICG Used in Performing Visceral Surgery?
In the primary consist stages, it becomes difficult to perform surgery as there can be complications of visceral injury. These complications are minimized by using ICG, as it marks the anatomical regions during the surgery. ICG is injected, which becomes fluorescent when excited by an infrared light or laser beam. The released fluorescence can be visualized using specialized cameras. ICG can be injected intravenously to visualize the blood supply, the lymph nose, and the tumor's location.
What Are the Various Uses of ICG?
Uses of ICG:
In recent years, fluorescence imaging techniques have become common, particularly ICG-based fluorescence techniques. It is used in a variety of treatment procedures and diagnostic procedures. As there are decreased and rare severe adverse effects due to this technique, fluorescent agent ICG is commonly used.
ICG in Peritoneal Carcinomatosis:
Peritoneal carcinomatosis is a rare cancer that affects the layer surrounding the abdominal organs. ICG is used for better removal of tumors during surgery. It helps in the intraoperative detection of tumors during open surgery for peritoneal carcinomatosis.
ICG in Liver Surgery:
Liver surgeries have been done in an increased amount by using the ICG fluorescence method because of its internal digital display of a segmental cross-section of the organ. Identification of the characteristics of the tumor makes it possible to visualize the lesions of the liver directly or indirectly and their metastasis. A drawback is that its advantage is limited to only superficial lesions as the penetration depth is less.
ICG in Identification of Internal Organs:
Identification of Ureter:
In rare cases, during abdominal surgery, the chances of injury to the ureter can occur. Ureteral damage can be measured using palpation and inspection, which becomes difficult during the surgery; hence ICG is used to identify damage to the ureter.
Fluorescence Angiography Used in the Colorectal Surgery:
Anastomotic leakage is a challenging complication during colorectal surgery. This leakage can occur due to technical factors, patient factors, and anastomotic blood supply.
ICG is used for carrying out fluorescence angiography, performed during the surgery to evaluate the blood supply in the anastomosis region. With the help of ICG, the leakage rate decreased, and blood perfusions (flow of blood) were detected, which increased the patient's prognosis and clinical outcome.
Detection of Lymph Node Metastasis:
Accurate staging of patients who have cancer can be done using ICG fluorescence imaging by detecting the lymph nodes. Similar nodal tissues can be identified during the surgery with the help of ICG used along with infrared laparoscopy.
Use of ICG in Metastatic Colorectal Cancer:
Bile metabolism occurs at a slower rate in primary liver cancers. When ICG is injected, it accumulates in these areas when the liver metabolizes it. ICG helps in identifying the tumor location helping the surgeons. Identification of the tumors present in the depth of the liver can be done along with ultrasound.
Advanced Use of ICG in Robotically Assisted Colorectal Surgery:
All the holistic benefits of ICG made it possible to include itself in robotically assisted colorectal surgery. The standard and essential benefit of reducing the anastomotic leakage and visualizing the ureter are the reasons for its use and robotic surgery.
Use of ICG in Monitoring Wound Contamination During the Surgery:
ICG Florence testing was used as a marker to detect perineal wound contamination. It is done by injecting the dye before the operation into the rectum and obtaining the fluorescence images during the surgery. Perennial own contamination is common in patients undergoing perennial abdominal reception. Careful skin preparation is needed to prevent stool contamination in the perineal region.
ICG in the Use of Fistulas in Patients With Crohn’s Disease:
The disease is an inflammatory bowel disorder causing inflammation of the gastrointestinal tract that extends from the stomach to the rectum. ICG solution can be administered orally or through the rectum. ICG helps in accurately diagnosing nearly 90 percent of fistulas. Connecting tunnels formed between two organs or between an organ to the body's surface occurring due to inflammation through Crohn's disease are called fistulas.
Conclusion
Various dyes are combined with fluorescent surgery, improving the visible spectrum that was increasing the efficacy of the surgery. Indocyanine green is one such dye used in surgery. ICG fluorescence method is an advanced intraoperative technique that is a safe and easy method to evaluate the complications that can occur during the surgery and prevent them. The uses and benefits of ICG are still enhancing in development. All these advancements can present large amounts of information and value to both the patients and the surgeries, enhancing and improving the outcome of the surgery.
