After fellowship, I joined the UNC faculty as a general gastroenterologist with expertise in anorectal disease and lower-GI motility disorders. While I was comfortable performing complex EMR, I still needed additional training and supervision before I felt ready to independently perform ESD or POEM. With the gracious support and encouragement of our division chief, I continued third-space endoscopy training with Dr. Grimm during dedicated protected time 2 days each month. Over the ensuing 4 years, I transitioned to fully independent practice performing all types of advanced EMR and third-space endoscopy including complex EMR, ESD, endoscopic full-thickness resection (EFTR), submucosal tunnel endoscopic resection (STER), esophageal POEM, gastric POEM, and Zenker’s POEM.
As one of the first gastroenterologists in the United States to perform third-space endoscopy without any formal training in advanced pancreaticobiliary endoscopy, I believe learning advanced endoscopic resection and third-space endoscopy is best achieved through a training pathway separate from the conventional advanced endoscopy fellowship focused on teaching EUS and ERCP. Although there are transferable skills learned from EUS and ERCP to the techniques used in third-space endoscopy, there is nothing inherent to performing EUS or ERCP that enables one to learn how to perform an ESD or a POEM.
There is a robust training pathway to teach advanced pancreaticobiliary endoscopy, but no formal training pathway exists to teach third-space endoscopy in the United States. Historically, a small number of interested and motivated advanced pancreaticobiliary endoscopists sought out opportunities to learn third-space endoscopy after completion of their advanced endoscopy fellowship, in some cases many years after graduation. For these early adopters in the United States, the only training opportunities required travel to Japan or another Eastern country with arrangements made to observe and participate in third-space endoscopy cases with experts there. With increased recognition of the benefits of ESD and POEM over the past 5-10 years in the United States, there has been greater adoption of third-space endoscopy and with it, more training opportunities. Still, there are very few institutions with formalized training programs in advanced endoscopic resection and third-space endoscopy in the United States to date.
Proof that this model works
In Eastern countries such as Japan, training endoscopists to perform ESD and POEM has been successfully achieved through an apprenticeship model whereby an expert in third-space endoscopy closely supervises a trainee who gains greater autonomy with increasing experience and skill over time. My personal experience is proof that this model works. But, adopting such a model more widely in the United States may prove difficult. We lack a sufficient number of experienced third-space endoscopy operators and, given the challenges to appropriate reimbursement for third-space endoscopy in the United States, there is understandable resistance to accepting the prolonged training period necessary for technical mastery of this skill.
In part, a long training period is needed because of a relative paucity of appropriate target lesions for ESD and the rarity of achalasia in the United States. While there is consensus among experts regarding the benefits of ESD for resection of early gastric cancer (EGC), relatively few EGCs are found in the United States and indications for ESD outside resection of EGC are less well defined with less clear benefits over more widely performed piecemeal EMR. Despite these challenges, it is critical that we continue to develop dedicated training pathways to teach advanced endoscopic resection and third-space endoscopy in the United States. My practice has evolved considerably since completion of fellowship nearly 6 years ago, and I now focus almost exclusively on advanced endoscopic resection and third-space endoscopy. Recently, Dr. Grimm and I began an advanced endoscopic resection elective for the general GI fellows at UNC and we are excited to welcome our first advanced endoscopic resection and third-space endoscopy fellow to UNC this July.
While there are many possible avenues to expertise in advanced endoscopic resection, few will likely follow the same path that I have taken. Trainees who are interested in pursuing this subspecialty should seek out supportive mentors in a setting where there is already a robust case volume of esophageal motility disorders and endoscopic resections. Success requires the persistent motivation to seek out diverse opportunities for self-study, exposure to experts, data on developments in the field, and hands-on exposure to as many ex-vivo and in-vivo cases as possible.
Dr. Kroch is assistant professor of medicine in the division of gastroenterology and hepatology at the University of North Carolina at Chapel Hill. He disclosed having no conflicts of interest.
