Cold snare polypectomy for colorectal polyps: current uses and development

Colorectal cancer is the third most common cancer globally, but up to 90% of cases can be prevented by removing precancerous polyps. One of the most promising tools for this is cold snare polypectomy (CSP)—a minimally invasive endoscopic technique that removes polyps without heat. A 2022 review by Tengjiao Gao (School of Medicine, Ningbo University) and Xiaoyun Ding (Department of Gastroenterology, Ningbo First Hospital) breaks down how CSP works, who it helps, and why it’s becoming a preferred choice for doctors and patients.

What Is Cold Snare Polypectomy?

CSP uses a thin, flexible wire loop (“snare”) to grasp and cut polyps from the intestinal lining—without the electrocautery (heat) used in traditional “hot” snare methods. The “cold” label means no thermal damage to surrounding tissue, making it gentler and less risky for patients.

Who Can Benefit from CSP?

The European Society of Gastrointestinal Endoscopy (ESGE)—a leading authority on digestive health—strongly recommends CSP as the preferred technique for diminutive polyps (≤5mm). This is because CSP achieves high complete resection rates (removing all polyp tissue), has low complications, and allows doctors to collect enough tissue for biopsy.

For small polyps (6–9mm), CSP is also effective. Studies show it meets the gold standard for safety, speed, and complete removal. ESGE further suggests CSP for sessile serrated polyps (SSPs)—a flat, slow-growing type linked to colorectal cancer—because its safety profile is superior to heat-based methods.

Even larger polyps (≥10mm) are being tested with CSP. A 2019 systematic review found CSP removes 99.3% of these polyps completely, with acceptable residual (4.1%) and recurrence (12–14%) rates. For people with familial adenomatous polyposis (FAP)—a genetic condition causing hundreds of polyps—CSP may help delay surgery by reducing polyp burden. One study of 79 FAP patients found no complications after CSP, and 77 saw fewer polyps at follow-up.

How Effective Is CSP?

Efficacy is measured by three key factors: complete resection rate, procedure time, and recurrence risk.

Complete resection: CSP removes polyps entirely 77–98% of the time—similar to hot snare polypectomy (HSP, 85–98.5%), according to a 2019 meta-analysis by Qu et al. It’s better than cold forceps polypectomy (CFP), which only works 76–83% of the time, because CSP removes a 2–3mm rim of normal tissue around the polyp—ensuring no cancerous cells are left behind. While CSP is slightly less effective than endoscopic mucosal resection (EMR, 98.5%), its safety makes it a viable alternative for many patients.
Speed: CSP is faster than heat-based methods. Procedures take 14–23 minutes on average (vs. 25–30 minutes for HSP) because it skips steps like electrocautery setup and submucosal saline injection. Even compared to CFP, CSP is quicker—one study found it takes 14 seconds per polyp vs. 22 seconds for CFP (since forceps often require multiple passes to ensure complete removal).
Recurrence: CSP has a low risk of residual or recurrent polyps. A 2015 study by Kim et al. found only 6.2% of CSP patients had residual tissue (vs. 29.7% for CFP). Another study by Saito et al. reported no recurrences at 1-year follow-up.

Is CSP Safe?

Safety is CSP’s biggest advantage over traditional methods. Here’s what research shows:

Delayed bleeding: The most common complication of hot snare procedures, delayed bleeding (5–21 days post-surgery) occurs when a heat-formed scab (eschar) falls off. HSP has a 1–14% risk, but CSP almost eliminates this—no eschar means no sloughing and no delayed bleeding.
Immediate bleeding: CSP has a higher immediate bleeding rate (up to 54% for large polyps) than HSP (14%), but this bleeding is usually mild. Most cases stop on their own, and doctors can use simple tools like hemostatic clips or argon plasma to control it. Protruding polyps and anticoagulant use are the main risk factors, but even then, bleeding is rarely severe.
Perforation: The biggest fear with endoscopic procedures—no studies have reported perforation with CSP. This is because CSP doesn’t cut deep into the intestinal wall (unlike heat-based methods, which can burn through tissue).
Electrocoagulation syndrome: CSP avoids this painful condition, which causes abdominal cramps, fever, or muscle tension in up to 5% of hot snare patients. Without heat, these side effects are almost non-existent.

Improving CSP with Dedicated Snares

Recent advances have led to dedicated cold snare polypectomy (DCSP)—snares designed specifically for cold resection. These tools have thinner, braided wires and a shielded shape that grips polyps better without tearing tissue.

Studies comparing DCSP to standard CSP show:

Better complete resection: DCSP removes 91–98% of small polyps (vs. 79–95% for standard CSP), especially for 8–10mm polyps (flat or stalked).
Similar safety: Immediate bleeding rates are slightly lower (1–24% vs. 5–28%) with no increase in complications. No perforation or delayed bleeding has been reported.
Versatility: New DCSP designs can switch to heat if needed—saving time during procedures when a large polyp requires hot snare removal.

While DCSP is promising, it hasn’t been tested on polyps >10mm or FAP patients yet. More research is needed to expand its use.

What’s Next for CSP?

CSP is already a standard for small polyps, but its potential is growing:

Larger polyps: Early data shows CSP is safe for nonpedunculated polyps >10mm—complete resection in 99% of cases with low recurrence.
FAP patients: CSP could become a long-term option for reducing polyp burden and delaying surgery (which carries risks like incontinence or reduced quality of life).
Anticoagulant users: CSP may be safer for patients on blood thinners, as it avoids heat-related bleeding risks.

The biggest gap? DCSP’s use in larger polyps and FAP. As more studies are done, CSP could become a first-line treatment for even more patients.

Why CSP Matters

For patients, CSP means faster procedures, fewer complications, and less pain. For doctors, it’s a versatile tool that balances efficacy and safety. Backed by ESGE guidelines and peer-reviewed research, CSP is changing how we prevent colorectal cancer—one polyp at a time.

doi.org/10.1097/CM9.0000000000001880

Was this helpful?

0 / 0