Jae Hyun Kim1, Se Woo Park2, Mi Kang Kim1, Jin Lee1, Sea Hyub Kae1, Hyun Joo Jang1, Dong Hee Koh1, Min Ho Choi1. 1. Division of Gastroenterology, Department of Internal Medicine, Hallym University Dongtan Sacred Heart Hospital, Hallym University College of Medicine, 7, Keunjaebong-gil, Hwaseong-si, Gyeonggi-do, 18450, Korea. 2. Division of Gastroenterology, Department of Internal Medicine, Hallym University Dongtan Sacred Heart Hospital, Hallym University College of Medicine, 7, Keunjaebong-gil, Hwaseong-si, Gyeonggi-do, 18450, Korea. britnepak@hallym.or.kr.
Abstract
BACKGROUND: Theoretically, use of the stylet during endoscopic ultrasound-guided fine-needle aspiration (EUS-FNA) will prevent the tip of the needle from being blocked and the sample from being contaminated, improving the quality and diagnostic yield of specimens. AIM: This meta-analysis aimed to evaluate any benefit from the use of a stylet during EUS-FNA. METHODS: MEDLINE, EMBASE, WEB of SCIENCE, and the Cochrane Central Register of Controlled Trials were searched for articles published through October 2015. A fixed-effects model was used to calculate the pooled effects when there is no heterogeneity and a random-effects model was used in situations with significant heterogeneity. RESULTS: Five prospective randomized controlled studies and two retrospective studies of a total of 5491 specimens (2504 specimens in the S+ group and 2987 specimens in the S- group) were included in this study. The pooled analysis demonstrated no significant differences in the adequate sample rate between the S+ group (2135/2504, 85.26 %) and S- group (2609/2987, 87.35 %) [odds ratio 0.94 (95 % confidence interval 0.79-1.11), p = 0.45]. Furthermore, the rate of cellularity > 50 %, the contamination rate, and the blood contamination rate were not significantly superior in the S+ group when compared with the S- group. CONCLUSIONS: Whether the use of a stylet improves the proportion of adequate specimens or quality of the specimen is questionable. Our results suggest that the use of a stylet dose not guarantee any advantage during EUS-guided tissue sampling.
BACKGROUND: Theoretically, use of the stylet during endoscopic ultrasound-guided fine-needle aspiration (EUS-FNA) will prevent the tip of the needle from being blocked and the sample from being contaminated, improving the quality and diagnostic yield of specimens. AIM: This meta-analysis aimed to evaluate any benefit from the use of a stylet during EUS-FNA. METHODS: MEDLINE, EMBASE, WEB of SCIENCE, and the Cochrane Central Register of Controlled Trials were searched for articles published through October 2015. A fixed-effects model was used to calculate the pooled effects when there is no heterogeneity and a random-effects model was used in situations with significant heterogeneity. RESULTS: Five prospective randomized controlled studies and two retrospective studies of a total of 5491 specimens (2504 specimens in the S+ group and 2987 specimens in the S- group) were included in this study. The pooled analysis demonstrated no significant differences in the adequate sample rate between the S+ group (2135/2504, 85.26 %) and S- group (2609/2987, 87.35 %) [odds ratio 0.94 (95 % confidence interval 0.79-1.11), p = 0.45]. Furthermore, the rate of cellularity > 50 %, the contamination rate, and the blood contamination rate were not significantly superior in the S+ group when compared with the S- group. CONCLUSIONS: Whether the use of a stylet improves the proportion of adequate specimens or quality of the specimen is questionable. Our results suggest that the use of a stylet dose not guarantee any advantage during EUS-guided tissue sampling.
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