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. 2017 Jan 11;42(2):223–232. doi: 10.1097/AAP.0000000000000549

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Copyright © 2017 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the American Society of Regional Anesthesia and Pain Medicine

This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal.

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Histograms of accuracy based on the distance (in millimeters) relative to the intended target by task type for (A) target-contact tasks and (B) target-proximity tasks, showing frequency as number n of tasks (y axis) where the needle tip was placed at a distance relative to the intended target in 1-mm increments (x axis). More NGT tasks (black bars) achieved distances closer to targets compared with CU tasks (gray bars). Furthermore, the number of unintentional contacts (B, leftmost bars) and wide misses (>12 mm, rightmost bars) were lower among NGT tasks for both target-proximity and target-contact tasks.