Now, colonic polypectomy is a cornerstone of gastrointestinal endoscopy, serving as the foundation for more advanced therapeutic techniques.
First of all, what's the Clinical Significance of Polypectomy?
Polypectomy serves three crucial purposes, which is
1. Prevention of colorectal cancer
2. Evaluation of treatment efficacy
3. Determination of subsequent colonoscopy screening strategies
The risk stratification of adenomas and the recommended surveillance intervals are closely related to these objectives. Low-risk patients typically undergo follow-up colonoscopy within 5-10 years, while high-risk patients are recommended for follow-up within 3 years. If no abnormalities are found during follow-up, the interval may be extended to 5-10 years.
Before performing polypectomy, it is crucial to assess the pathological characteristics of the polyp. The Japanese endoscopy community has developed two classification systems based on narrow-band imaging (NBI) features: the NICE (NBI International Colorectal Endoscopic) classification and the CP (Capillary Pattern) classification.
The NICE classification, which can be performed without magnification, categorizes polyps into three types based on color, vessel pattern, and surface pattern. This system is simple, practical, and easily applicable in clinical settings.
The CP classification requires magnifying endoscopy and more extensive training. It distinguishes between neoplastic and non-neoplastic polyps based on the presence of capillary networks and further differentiates between low-grade and high-grade dysplasia or invasive cancer based on capillary density and morphology.
Secondly, the most comon Polypectomy Techniques is?
The choice of polypectomy technique depends on the polyp's size, morphology, and location. Common methods include:
1. Cold/Hot Forceps Polypectomy: Suitable for diminutive polyps (<5 mm). Hot forceps can address residual tissue and provide hemostasis but carries a risk of transmural injury if overused.
The picture is from the Internet. If there is any infringement, please contact us to delete it.
2. Cold/Hot Snare Polypectomy: Appropriate for various sizes of pedunculated and small sessile polyps (<2 cm). For larger pedunculated polyps (>2 cm), hot snare is preferred, with careful attention to avoiding contact with the bowel wall to prevent thermal injury.
The picture is from the Internet. If there is any infringement, please contact us to delete it.
3. Endoscopic Mucosal Resection (EMR): Indicated for flat or laterally spreading lesions approaching 2 cm in diameter. Submucosal injection elevates the lesion, facilitating safer and more complete resection.
The picture is from the Internet. If there is any infringement, please contact us to delete it.
4. Endoscopic Submucosal Dissection (ESD): Employed for lesions larger than 2 cm requiring en bloc resection, those with negative lifting signs, or early-stage cancers. This technique is more challenging and carries a higher risk of complications but allows for complete resection and accurate pathological assessment.
The picture is from the Internet. If there is any infringement, please contact us to delete it.
5. Non-Resection Techniques: For known benign or low-grade lesions, techniques such as Argon Plasma Coagulation (APC), high-frequency electrocoagulation, or endoscopic ligation may be used to ablate the polyp without tissue retrieval.
And, the principles of Safe and Effective Polypectomy
1. Preoperative planning is crucial, especially for complex polyps. Proper communication with nursing and anesthesia staff and preparation of necessary equipment are essential.
2. Maintaining good scope maneuverability ensures precise manipulation during the procedure.
3. Adequate bowel preparation and optimal patient positioning are vital for clear visualization and safe polypectomy.
4. The use of a transparent cap can aid in flattening mucosal folds and creating space for polyp manipulation.
5. In areas with larger luminal space, such as the ascending colon and rectum, retroflexion of the endoscope can provide a better view of polyp morphology and facilitate treatment planning.
