The diagnostic performance of novel torque technique for endoscopic ultrasound-guided tissue acquisition in solid pancreatic lesions: A prospective randomized controlled trial.
BACKGROUND AND AIM
Although several techniques for improved outcomes in endoscopic ultrasound (EUS)-guided tissue acquisition have been reported, the reported diagnostic yield for pancreatic masses is not satisfactory. The effects of novel technique (torque method) on twisting the scope in the clockwise or counterclockwise direction during EUS-fine needle biopsy (EUS-FNB) are unknown. We compared the diagnostic yield of EUS-FNB for pancreatic masses using the torque and standard techniques.


METHODS
From April 20, 2017, to March 16, 2018, 124 consecutive patients with solid pancreatic mass who underwent EUS-FNB using either the torque or standard technique were randomly assigned. Three passes were made with each technique, comprising 10 uniform to-and-fro movements on each pass with a 10-mL syringe suction. The primary outcome was procurement rates of histologic cores, and the secondary outcomes were the diagnostic performance and technical failure.


RESULTS
There were significant differences between the groups regarding the procurement rate of the histologic core and optimal quality core (standard vs torque: 87.1% [54/62] vs 98.4% [61/62], P = 0.038 and 79.0% [49/62] vs 93.5% [58/62], P = 0.037). The sensitivity, specificity, positive predictive value, and negative predictive values of EUS-FNB were 85.45%, 100%, 100%, and 46.67%, respectively, for the standard technique and 96.49%, 100%, 100%, and 71.43%, respectively, for the torque technique. The diagnostic accuracies of the standard and torque techniques were 87.10% and 96.77%, respectively.


CONCLUSIONS
The torque technique for EUS-FNB offered acceptable technical feasibility and superior diagnostic performance, including optimal histologic core procurement, compared with the standard technique.
['Park|Se Woo|SW|https://orcid.org/0000-0001-6531-4076', 'Lee|Sang Soo|SS|', 'Song|Tae Jun|TJ|', 'Koh|Dong Hee|DH|https://orcid.org/0000-0003-2078-5805', 'Hyun|Bomi|B|', 'Chung|Doocheol|D|', 'Lee|Jin|J|', 'Shin|Eun|E|', 'Hong|Seung-Mo|SM|', 'Park|Chan Hyuk|CH|']
D000368:Aged D044963:Biopsy, Fine-Needle D016145:Endoscopy, Digestive System D019160:Endosonography D005240:Feasibility Studies D005260:Female D006801:Humans D061705:Image-Guided Biopsy D008297:Male D008875:Middle Aged D010190:Pancreatic Neoplasms D011446:Prospective Studies D013048:Specimen Handling
torque tissue acquisition solid pancreatic lesion endoscopic ultrasound histologic core