Since Cuschieri et al. [14] first reported thoracoscopic esophagectomy in 1992, laparo-thoracoscopic esophagectomy has been routinely performed to treat patients with esophageal cancer[15]. However, because of the narrow operating space, lacking of triangular vision of traditional endoscopy, difficult cooperation between the master and assistant, studies[16–18] on the single-port laparoscopic esophagectomy are still extremely limited. And the surgical approach of SLRM has hardly been mentioned before. In the present study, we sought to evaluate the effectiveness and feasiblity of the novel procedure and shared our experience.
In 2020, the SLRM was developed in our center. All the patients underwent the McKeown procedure. This study focuses on the abdominal step, operative advantages and perioperative complications. The procedure can be summarized into three steps: 1) retraction, which includes liver lobe retraction, the lesser curvature mobilization, left gastric vessel dissection, and lymph node dissection; 2) dissection, which involves the dissection of the cardioesophageal junction. In patients with a tumor at the lower location, we should cut off the lower esophagus in the thoracic cavity; and 3) mobilization, which includes mobilization of the gastric fundus and the hilum of the spleen, along with lymph node dissection of the greater curvature.
The SLRM has the following obvious advantages. Firstly, compared with the traditional five-port laparoscope, the single-port laparoscope reduced the number of abdominal incision to one. The nerve and muscle compressions caused by the instrument operation were also limited to a 3-cm-incision, which suggests less trauma, less postoperative stress and pain, and better cosmetic effects.
Secondly, we optimized the surgical procedure. Conventional laparoscopic gastric mobilization starts from the greater curvature. The space is limited by the upper diaphragm. The risk of bleeding from the spleen is high, especially in patients with obesity or bloat. But, the SLRM mobilized the gastric tissue reversely from the lesser curvature to the gastric fundus and the greater curvature. The omental adipose tissue on the greater curvature can be avoided, and the operation is not affected even if bloating and the gastrosplenic ligament is exposed clearly. The operation of the upper pole of the spleen, such as cutting off the gastrosplenic ligaments and short gastric vessels, is unimpeded.
Thirdly, when the gastric conduit is constructed and placed back to the abdominal cavity, it is easier to re-establish the pneumoperitoneum with the single-port operation. The gastric conduit can be pulled up through the mediastinum under laparoscopic surveillance. In contrast, the re-establishment of traditional laparoscopic pneumoperitoneum is slightly troublesome.
Meanwhile, we have several considerations to share about this novel technique. 1) Our approach benefits from the use of a multichannel single-port incision protector which contains four moderately sized ports and they are flexible and interchangeable. The base is locked in the abdominal wall. The upper part can be disassembled and assembled freely. 2) The skilled implementation of single-port abdominal surgery also requires a period of training and experience. After the surgical procedure was standardized, the laparoscopic time was reduced to 40min, while the time is about 60min in the multi-port laparoscopic procedure[13]. 3) Some surgical techniques are worth special attention. The first one is the site of incision. The most appropriate location for a 3-cm-long incision is in the middle between the umbilicus and the xiphoid process. If the incision location is too low, the vision well be remote, and the operating instruments can interfere with each other frequently. If the incision location is too high, retracting the liver lobe well be difficult, which can obstruct the surgical field. The second important technique is the retraction process of the left liver lobe. Lakdawala et al. [19] routinely used a grasping forceps to elevate the left lobe. Huang et al. [20] recommended inserting needles into the edge of the liver for retraction. We used a 2–0 prolene needle and thread to enter from the left margin of the costal arch, then removed the needle through the abdominal wall on the left of the falciform ligament. The left liver lobe was then retracted and fixed at the hiatus, which offered a better exposure to the lesser curvature and the cardia. 4) The other important part is the skill of the laparoscope holder. The laparoscope should be placed at the lower pole of the incision and pressed down as far as possible. Other surgical instruments should be kept parallel and leveled up without crossing. A small field of vision aperture can enlarge the overall field of vision and reduce the limitation of a narrow surgical space.
In our series, the average number of harvested abdominal lymph nodes was about 10.2, which is similar to previous meta-analyses[21, 22]. In terms of intraoperative complications, only one patient with abdominal wall bled from an accidental puncture by the needle. For postoperative complications, the reports of McKeown MIE from Japan indicate that The median incidences of pneumonia, anastomotic leakage, and recurrent laryngeal nerve palsy were 12.0%, 7.2%, and 19.8%, respectively[23]and our result were 8.3%, 2.5%, and 16.8%, respectively, which were lower.
We note that this is just our personal opinion, and currently there is no sufficient data compare SLRM with traditional laparoscopic surgery; therefore, a single-center randomized controlled study about the comparison is being conducted at our institution and has been registered at Clinical Trials Registry (NO. ChiCTR 2100043730). We look forward to further results.