Minimally Invasive Approaches for Thyroid Surgery-Pitfalls and Promises

Transoral endoscopic thyroidectomy vestibular approach as a safe and feasible alternative to open thyroidectomy: a systematic review and meta-analysis

BACKGROUND

Transoral endoscopic thyroidectomy vestibular approach (TOETVA) is a scarless alternative to open thyroidectomy (OT). This systematic review and meta-analysis aimed to synthesize evidence comparing the intraoperative and postoperative outcomes of TOETVA and OT.

METHODS

A systematic literature search of PubMed, Web of Science, the Cochrane Library, and Google Scholar was performed to identify studies comparing the outcomes of TOETVA and OT published before February 2023. The outcomes of interest were operative time, intraoperative blood loss, hospital stay, postoperative pain, number of central lymph nodes retrieved, number of metastatic central lymph nodes, and incidences of transient and permanent recurrent laryngeal nerve injury, transient and permanent hypocalcemia, hematoma, and infection.

RESULTS

Thirteen studies published between 2016 and 2022, involving a total of 2889 patients (TOETVA, n =1085; OT, n =1804) were included in this systematic review and meta-analysis. Meta-analysis showed that the TOETVA group had a significantly longer overall operative time (weighted mean difference [WMD] 55.19; 95% CI, 39.15, 71.23; P <0.001), longer hospital stay (WMD, 0.27; 95% CI, 0.14, 0.39; P <0.001), and lower pain scores on postoperative day 1 (WMD, -1.41; 95% CI, -2.79, -0.03; P =0.04) than the OT group. Other intraoperative and postoperative outcomes were not significantly different between the groups.

CONCLUSION

TOETVA has a similar safety profile to OT with less postoperative pain, making it an appropriate and more cosmetically appealing alternative to OT for select patients.

Comparisons of different approaches and incisions of thyroid surgery and selection strategy

To date, the traditional open thyroid surgery via a low collar incision remains the standard approach for patients undergoing thyroidectomy. However, this conventional approach will inevitably leave patients a neck scar and even cause a variety of complications such as paresthesia, hypesthesia, and other uncomfortable sensations. With the progress in surgical techniques, especially in endoscopic surgery, and the increasing desire for cosmetic and functional outcomes, various new approaches for thyroidectomy have been developed to avoid or decrease side effects. Some of these alternative approaches have obvious advantages compared with traditional surgery and have already been widely used in the treatment of thyroid disease, but each has its limitations. This review aims to evaluate and compare the different approaches to thyroidectomy to help surgeons make the proper treatment strategy for different individuals.

Endoscopic total parathyroidectomy via anterior chest approach with forearm autotransplantation for secondary hyperparathyroidism: a comparison of surgical results with open total parathyroidectomy with autotransplantation

Objective

This paper aimed to evaluate the clinical value of performing an endoscopic total parathyroidectomy through anterior chest approach with autotransplantation (EACtPTx+AT) in treating secondary hyperparathyroidism (SHPT) to summarize and share the clinical experience.

Methods

24 patients with SHPT were retrospectively analyzed:11 patients underwent open total parathyroidectomy with autotransplantation (OtPTx+AT Group) and 13 patients underwent endoscopic parathyroidectomy through anterior chest approach with autotransplantation (EACtPTx+AT Group). Comparing the two groups regarding the following factors: (1) operating conditions, such as the blood loss during the operation, the length of time spent on the operating table, the number of parathyroid glands removed, postoperative drainage volume and hospital stay. (2) clinical efficacy, parathyroid hormone (PTH) and serum calcium (Ca) levels. (3) postoperative complications.

Results

First, there were no significant differences in the number of parathyroid gland resection, operation time, intraoperative blood loss and hospital stay between the two groups. While there were significant differences in postoperative drainage volume between the two groups. Second, the two groups preoperative PTH and preoperative serum calcium decreased significantly compared with those of the two groups after surgery and there was a statistically significant difference. Thirdly, there was no postoperative bleeding, hoarseness or choking in the two groups and no conversion to open surgery case in EACtPTx+AT group.

Conclusion

Endoscopic treatment of SHPT using the anterior chest approach with forearm autotransplantation significantly improves clinical symptoms and lowers levels of PTH and serum calcium after the operation. The results confirm the operation's safety and effectiveness.

Learning curve and volume outcome relationship of endoscopic trans-oral versus trans-axillary thyroidectomy; A systematic review and meta-analysis

BACKGROUND

In the modern era, minimally invasive surgery is rapidly evolving and even replacing conventional open techniques in many surgical fields. Thyroidectomy was not an exception, with the introduction of multiple endoscopic thyroidectomy techniques. Trans-oral endoscopic trans-vestibular thyroidectomy (TOT) is a novel technique with promising outcomes. We conducted this meta-analysis to compare surgical outcomes and learning curves for TOT and other endoscopic thyroidectomy techniques.

METHODS

A systematic review in PubMed, MEDLINE, and EMBASE databases was conducted searching for publications on TOT versus trans-axillary thyroidectomy (TAT). The primary endpoint was operative (OR) time. Secondary endpoints were number of harvested lymph nodes (LNs), estimated blood loss (EBL), recurrent laryngeal nerve (RLN) injury, hoarseness, seroma, infection, chyle leak, hypocalcemia, hospital length of stay (LOS), and Cost. We also investigated the learning curve for each technique. Leave-out-out analysis, meta-regression, and subgroup analysis were used. Random effect inverse variance method was utilized.

RESULTS

Among 3820 retrieved studies, 15 studies (10 unmatched and 5 matched), with 2173 (TOT: 1024(47.12%) and TAT:1149(52.87%)) patients, met the inclusion criteria. The operative time and harvested L. Ns number were higher in TOT versus TAT (standard mean difference (SMD) = 0.72 [95%CI 0.07; 1.37], P = 0.029 and SMD = 0.32 [95%CI 0.02; 0.62], P = 0.036 respectively) while less EBL in TOT versus TAT (SMD = -0.26 [-0.43; -0.09], P = 0.0018). All other outcomes showed no significant difference between both groups. Weighted mean values for TOT and TAT were 158.03 vs 144.97 min for OR time, 6.33 vs 5.16 for harvested LNs, and $5,919.05 vs $6,253.79 for the cost. Statistical significance in learning curve development was noticed ranging between 6 and 15 annual cases.

CONCLUSION

Trans-oral thyroidectomy is a safe and reliable technique with outcomes comparable to other endoscopic techniques. It provides better access to the central compartment with a more feasible LN dissection. Improvement in surgical outcomes is expected with growing learning curve and technique mastery.

Endoscopic Lateral Neck Dissection: A New Frontier in Endoscopic Thyroid Surgery

Background

Endoscopic thyroidectomy and robotic thyroidectomy are effective and safe surgical options for thyroid surgery, with excellent cosmetic outcomes. However, in regard to lateral neck dissection (LND), much effort is required to alleviate cervical disfigurement derived from a long incision. Technologic innovations have allowed for endoscopic LND, without the need for extended cervical incisions and providing access to remote sites, including axillary, chest-breast, face-lift, transoral, and hybrid approaches.

Methods

A comprehensive review of published literature was performed using the search terms "lateral neck dissection", "thyroid", and "endoscopy OR endoscopic OR endoscope OR robotic" in PubMed.

Results

This review provides an overview of the current knowledge regarding endoscopic LND, and it specifically addresses the following points: 1) the surgical procedure, 2) the indications and contraindications, 3) the complications and surgical outcomes, and 4) the technical advantages and limitations. Robotic LND, totally endoscopic LND, and endoscope-assisted LND are separately discussed.

Conclusions

Endoscopic LND is a feasible and safe technique in terms of complete resection of the selected neck levels, complications, and cosmetic outcomes. However, it is recommended to strictly select criteria when expanding the population of eligible patients. A formal indication for endoscopic LND has not yet been established. Thus, a well-designed, multicenter study with a large cohort is necessary to confirm the feasibility, long-term outcomes, oncological safety, and influence of endoscopic LND on patient quality of life (QoL).

Evaluation of the clinical value of carbon nanoparticles in endoscopic thyroidectomy and prophylactic central neck dissection through total mammary areolas approach for thyroid cancer

Background

Carbon nanoparticles (CNs) are tracers used in thyroid surgery of patients with thyroid cancer (TC) to help remove lymph nodes and protect the parathyroid gland. The facilitative effect of carbon nanoparticles in endoscopic thyroidectomy and prophylactic central neck dissection (pCND) has not been reported.

Methods

The protective effect on parathyroid gland (PG) function and the numbers of identified parathyroid glands and central lymph nodes in endoscopic thyroid surgery through the total mammary areolas approach were compared between the CN and control groups.

Results

All endoscopic thyroidectomies were successfully completed. No difference was found in either group regarding the general characteristics or operative complications. The mean number of superior PGs and inferior PGs identified in situ or in the dissected central lymph tissues was not different between the groups. The mean number of lymph nodes removed by unilateral CND was greater in the CN group than in the control group. However, there was no difference in the number of harvested lymph nodes when excluding the LNs less than 5 mm, which exhibit an extremely low metastatic rate.

Conclusion

Carbon nanoparticles do not improve the protective effect on the parathyroid gland, especially the inferior glands, in endoscopic thyroid surgery through the total mammary areolas approach. There is no need to use CNs to facilitate the lymph node harvest in endoscopic prophylactic unilateral CND.

Transoral endoscopic thyroidectomy by a vestibular approach: cadaver simulation experience and ethicolegal issues

This article describes the use of transoral endoscopic thyroidectomy by a vestibular approach on cadavers to improve the technical and non-technical skills of surgeons.