How does the resectoscope compare with mechanical tissue removal systems?
In 2005, the first hysteroscopic mechanical tissue removal system was introduced in the United States, providing an additional treatment method for such intrauterine masses as fibroids and polyps.
Advantages. Rather than using an electrical current, these tissue removal systems use a rotating blade with suction that is introduced through a specially designed rigid hysteroscopic sheath. As the instrument incises the pathology, the tissue is removed from the intrauterine cavity and collected in a specimen bag inside the fluid management system. This immediate removal of tissue allows for insertion of the device only once during initial entry, decreasing both the risk of perforation and operative times. Furthermore, mechanical tissue removal systems can be used with isotonic media, negating the risks associated with hypotonic media. Currently, the 2 mechanical tissue removal systems available in the United States are the TruClear and the MyoSure hysteroscopic tissue removal systems.
Studies comparing mechanical tissue removal of polyps and myomas with conventional resectoscope resection have found that mechanical tissue removal is associated with reduced operative time, fluid deficit, and number of instrument insertions.4-8 However, studies have found no significant difference in postoperative patient satisfaction.7,9
Additionally, hysteroscopic tissue removal systems have an easier learning curve. Van Dongen and colleagues conducted an RCT to compare resident-in-training comfort levels when learning to use both a mechanical tissue removal system and a traditional resectoscope; they found increased comfort with the hysteroscopic tissue removal system, suggesting greater ease of use.10
Drawbacks. Despite their many benefits, mechanical tissue removal systems have some disadvantages when compared with the resectoscope. First, mechanical tissue removal systems are associated with higher instrument costs. In addition, they have extremely limited ability to achieve hemostasis when encountering blood vessels during resection, resulting in poor visibility especially when resecting large myomas with feeding vessels.
Hysteroscopic mechanical tissue removal systems typically use higher intrauterine pressures for uterine distension compared with the resectoscope, especially when trying to improve visibility in a bloody surgical field. Increasing the intrauterine pressure with the distension media allows for compression of the blood vessels. As a result, however, submucosal fibroids classified as FIGO 2 (International Federation of Gynecology and Obstetrics) may be less visible since the higher intrauterine pressure can compress both blood vessels and submucosal fibroids
Additionally, mechanical tissue removal systems have limited ability to resect the intramural component of FIGO 1 or FIGO 2 submucosal fibroids since the intramural portion is embedded in the myometrium. Use of the resectoscope loop instead allows for a technique called the cold loop dissection, which uses the resectoscope loop to bluntly dissect and enucleate the intramural component of FIGO 1 and FIGO 2 submucosal myomas from the surrounding myometrium without activating the current. This blunt cold loop dissection technique allows for a deeper and more thorough resection. Often, if the pseudocapsule plane is identified, even the intramural component of FIGO 1 or FIGO 2 submucosal fibroids can be resected, enabling complete removal.
Lastly, mechanical tissue removal systems are not always faster than resectoscopes for all pathology. We prefer using the resectoscope for larger myomas (>3 cm) as the resectoscope allows for resection and removal of larger myoma chips, helping to decrease operative times. Given the many benefits of the resectoscope, we argue that the resectoscope loop remains a crucial instrument in operative gynecology and that learners should continue to hone their hysteroscopic skills with both the resectoscope and mechanical tissue removal systems.
Tips and tricks for hysteroscopic myomectomy with the resectoscope loop
In the video below, "Bipolar resectoscope: Optimizing safe myomectomy," we review specific surgical techniques for optimizing outcomes and safety with the resectoscope loop. These include:
- bow-and-arrow technique
- identification of the fibroid anatomy (pseudocapsule plane)
- blunt cold loop dissection
- the push-and-tuck method
- efficient electrosurgical hemostasis (TABLE 2).
Although we use bipolar energy during this resection, the resection technique using the monopolar loop is the same.
Vidyard Video
The takeaway
The resectoscope loop is a valuable tool that offers gynecologic surgeons a wider range of techniques for myomectomy. It also offers several surgical and clinical advantages. It is important to train residents in the use of both hysteroscopic mechanical tissue removal systems and resectoscope loops. ●