BACKGROUND: Adequate needle size and tissue acquisition techniques for endoscopic ultrasound-guided fine needle aspiration (EUS-FNA) need further elucidation. Moreover, the actual negative pressure and suction forces of FNA needles remain unknown. We evaluated the suction forces of 19-gauge, 22-gauge, and 25-gauge conventional FNA needles and side hole aspiration needles using conventional negative pressure and the slow pull technique. METHODS: Using a manometer, we determined the mean (SD) negative pressure and suction force for needle gauge, aspiration volume, and aspiration technique. We also evaluated the time to reach the maximum negative pressure. RESULTS: Suction force was comparatively higher in the 19-gauge needle when 50 ml of negative pressure was applied. Suction force using the slow pull method was very weak at 5% of pressure found with conventional methods. With the use of a 20-ml syringe, the time to reach the maximum negative pressure was 4 s in the 19-gauge needle, 11 s in the 22-gauge needle, and 80 s in the 25-gauge needle. CONCLUSIONS: Bench-top testing showed that suction force increases with a larger gauge needle and larger aspiration volume. The slow pull method produces a very weak suction force. The time to reach the maximum negative pressure was longest in the 25-gauge needle.
BACKGROUND: Adequate needle size and tissue acquisition techniques for endoscopic ultrasound-guided fine needle aspiration (EUS-FNA) need further elucidation. Moreover, the actual negative pressure and suction forces of FNA needles remain unknown. We evaluated the suction forces of 19-gauge, 22-gauge, and 25-gauge conventional FNA needles and side hole aspiration needles using conventional negative pressure and the slow pull technique. METHODS: Using a manometer, we determined the mean (SD) negative pressure and suction force for needle gauge, aspiration volume, and aspiration technique. We also evaluated the time to reach the maximum negative pressure. RESULTS: Suction force was comparatively higher in the 19-gauge needle when 50 ml of negative pressure was applied. Suction force using the slow pull method was very weak at 5% of pressure found with conventional methods. With the use of a 20-ml syringe, the time to reach the maximum negative pressure was 4 s in the 19-gauge needle, 11 s in the 22-gauge needle, and 80 s in the 25-gauge needle. CONCLUSIONS: Bench-top testing showed that suction force increases with a larger gauge needle and larger aspiration volume. The slow pull method produces a very weak suction force. The time to reach the maximum negative pressure was longest in the 25-gauge needle.
Authors: Payal Saxena; Mohamad El Zein; Tyler Stevens; Ahmed Abdelgelil; Sepideh Besharati; Ahmed Messallam; Vivek Kumbhari; Alba Azola; Jennifer Brainard; Eun Ji Shin; Anne Marie Lennon; Marcia I Canto; Vikesh K Singh; Mouen A Khashab Journal: Endoscopy Date: 2017-12-22 Impact factor: 10.093
Authors: Vivek Kumbhari; Irene Peñas; Alan H Tieu; Carlos De la Serna-Higuera; Manie Juneja; Fuad Maufa; Saowanee Ngamruengphong; Mohamad H El-Zein; Nadim Haddad; Sandeep Krishnan; Susana Gonzalez; Peter V Renny; Payal Saxena; Linda Howard; Christopher J DiMaio; Jonathan M Buscaglia; Manuel Perez-Miranda; Mouen A Khashab Journal: Dig Dis Sci Date: 2016-10-06 Impact factor: 3.199