alexa EUS-guided tissue sampling: comparison of "dual sampling" (Trucut biopsy plus FNA) with "sequential sampling" (Trucut biopsy and then FNA as required).
Gastroenterology

Gastroenterology

Journal of Gastrointestinal & Digestive System

Author(s): Aithal GP, Anagnostopoulos GK, Tam W, Dean J, Zaitoun A,

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Abstract BACKGROUND AND STUDY AIMS: Both endoscopic ultrasound- (EUS-) guided tissue sampling techniques, fine-needle aspiration (FNA) and Trucut biopsy, have advantages and limitations. The aim of this study was to develop a strategy of combining these two EUS-guided sampling techniques in order to maximize the diagnostic accuracy and minimize duplication. PATIENTS AND METHODS: In this multicenter study we performed "dual sampling" (i. e. with both FNA and Trucut biopsy) in 95 patients during phase 1 of the study and "sequential sampling" (i. e. performing FNA only when Trucut biopsy tissue cores were macroscopically inadequate) in 72 patients during phase 2. RESULTS: During the study period, 167/401 patients referred for EUS-guided sampling were eligible for the study; only solid lesions were included. In 143/167 patients (86 \%), sampling was performed via the transesophageal or transgastric routes. When the dual sampling strategy was used, an accurate diagnosis was achieved in 78/95 patients by FNA, compared with 85/95 by Trucut biopsy ( P = 0.21). The combined accuracy of the dual sampling strategy was higher than FNA alone (88/95 vs. 78/95, P = 0.048), but was not significantly higher than Trucut biopsy alone (88/95 vs. 85/95, P = 0.61). Using the sequential sampling strategy, an accurate diagnosis was achieved in 66/72 patients (92 \%) compared with 88/95 (93 \%) for dual sampling ( P = 1.0), and 8/72 patients (11 \%) had to undergo FNA after Trucut biopsy failed to obtain an adequate sample. One patient with mediastinal tuberculosis developed a cold abscess following Trucut biopsy. CONCLUSION: A sequential sampling strategy, in which EUS-guided Trucut biopsy is attempted first, and FNA performed only when Trucut biopsy fails to obtain a macroscopically adequate sample, achieves a diagnostic accuracy of 92 \%, with 11 \% of patients requiring both sampling procedures. This article was published in Endoscopy and referenced in Journal of Gastrointestinal & Digestive System

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