LAMS for gallbladder drainage
BY THIRU MUNIRAJ, MD, PHD, FACG, FRCP
Surgical cholecystectomy is the gold standard of treatment for acute cholecystitis (AC).1 The morbidity and mortality rates remain high in high-risk surgical patients, such as those with cirrhosis, coagulopathy, advanced malignancy, severe cardiopulmonary conditions, or poor performance status. Percutaneous gallbladder drainage (PT-GBD) typically has been performed as an alternative in these cases. Endoscopic ultrasound-guided gallbladder drainage (EUS-GBD) is rapidly becoming a preferred alternative treatment to surgery in the case of AC at expert centers.
Dr. Thiru Muniraj
Since Baron and Topazian introduced EUS-GBD using a double pigtail stent in 2007, the procedure has evolved with the introduction of dedicated newly developed short, bi-flanged, covered lumen-apposing metal stents (LAMS) that have revolutionized this procedure as a single-step technique with excellent efficacy and safety outcomes. Although EUS-GBD is widely adopted among endosonographers, several skilled ERCP [endoscopic retrograde cholangiopancreatography] endoscopists still perform endoscopic transpapillary gallbladder drainage (ET-GBD) with ERCP as an alternative for high-risk surgical patients with AC. However, three-way comparative studies and randomized trials between PT-GBD, ETGBD, and EUS-GBD have clearly shown that EUS-GBD with LAMS is the most effective and safer alternative with the lowest rate of recurrent cholecystitis.2,3 The recent Tokyo Guidelines 2018 now suggest EUS-GBD as one of the viable options for AC treatment.4
In my institution, we offer EUS-GBD for nonsurgical candidates with AC with and without gallstones. In addition to its excellent benefits on quality of life through avoidance of an external percutaneous drain, EUS-GBD offers the ability to remove gallstones endoscopically using irrigation, suction, basket, and direct electrohydraulic lithotripsy. Moreover, EUS-GBD allows direct visualization and mucosal evaluation of the gallbladder when dysplasia or malignancy is suspected. The other indications where I perform EUS-GBD drainage are conversion of PT-GBD to EUS-GBD and as a backdoor alternate to failed ERCP where the cystic duct is patent and EUS-bile duct drainage is not amenable. In nonoperative malignant biliary stricture patients with indwelling metal biliary stents covering the cystic duct, I have a low threshold to perform a prophylactic EUS-GBD if the gallbladder is distended.
I perform EUS-GBD procedures under propofol intravenous anesthesia with the patient in the left lateral position on the fluoroscopy table. I choose the site to create the fistula for EUS-GBD either in the duodenal bulb or gastric antrum, whichever seems safer and easier to deploy the LAMS stent without torquing the endoscope much. In case of inadvertent complications such as stent maldeployment, the gastric site is often very forgiving. My preferred stent for EUS-GBD is 10 mm x 10 mm LAMS with hot cautery, as this seems to be the ideal size. We can choose a 10 mm x 15 mm stent if a larger stone removal is expected. I never choose smaller LAMS stents (6 mm and 8 mm), as the saddle length is not enough to bridge the thickened gallbladder wall and the thick gastric antral wall. In patients with calculous cholecystitis, I prefer to place a 7Fr 4cm pigtail plastic stent within the lumen of LAMS to ensure patency, especially if it is a gastric site, as food occlusion is more common. Unlike with pseudocyst drainage, these LAMS for EUS-GBD can be left indefinitely without removal. I avoid EUS-GBD in patients who have large-volume ascites or are too sick to tolerate anesthesia. Although a subsequent cholecystectomy post EUS-GBD is doable, I have a clear discussion with the surgeon before choosing this approach over ERCP ET-GBD in case future surgery is still an option. This is more important in patients who are awaiting liver transplantation.
The first step in establishing a program for EUS-GBD is to establish strong collaboration with your surgeons. In our institution, once our surgeons determine that patients with AC are high risk for surgery, they initiate a multidisciplinary discussion and reach out to advanced endoscopists at the same time or before consulting interventional radiology. The key to establishing a successful EUS-GBD program is to get “buy-in” from the surgeons and create a “signature” pathway for AC in your own institution.
EUS-GBD to drain the gallbladder in nonsurgical patients is one of my favorite procedures. Until the currently available LAMS secures an on-label indication for AC, we must wait and watch to see if there are enough advanced endoscopists ready to take over the challenge of all nonsurgical cholecystitis gallbladders – especially during late-night calls – rather than requesting PT-GBD. Soon, EUS-GBD will consign PT-GBD to centers without access to advanced endoscopists who perform EUS-guided interventions and limit ERCP transpapillary ET-GBD to patients with coagulopathy or large ascites.
Dr. Muniraj is associate professor of medicine, Yale School of Medicine, New Haven, Conn., and a consultant to Boston Scientific.
References
1. Endo I et al. Optimal treatment strategy for acute cholecystitis based on predictive factors: Japan-Taiwan multicenter cohort study. J Hepatobiliary Pancreat Sci. 2017. 24(6):346-61.
2. Siddiqui A et al. Three-way comparative study of endoscopic ultrasound-guided transmural gallbladder drainage using lumen-apposing metal stents versus endoscopic transpapillary drainage versus percutaneous cholecystostomy for gallbladder drainage in high-risk surgical patients with acute cholecystitis: clinical outcomes and success in an international, multicenter study. Surg Endosc. 2019;33(4):1260-70.
3. Teoh AYB et al. Endosonography-guided gallbladder drainage versus percutaneous cholecystostomy in very high-risk surgical patients with acute cholecystitis: An international randomised multicentre controlled superiority trial (DRAC 1). Gut. 2020;69(6):1085-91.
4. Mori Y et al. Tokyo Guidelines 2018: Management strategies for gallbladder drainage in patients with acute cholecystitis (with videos). J Hepatobiliary Pancreat Sci. 2018;25(1):87-95.
