{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T20:31:17Z","timestamp":1788985877899,"version":"build-2803163510"},"reference-count":19,"publisher":"BMJ","issue":"12","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["Reg Anesth Pain Med"],"accepted":{"date-parts":[[2023,7,10]]},"published-print":{"date-parts":[[2023,12]]},"abstract":"<jats:sec>\n                  <jats:title>Introduction<\/jats:title>\n                  <jats:p>Consistency in needle tip positioning within interfascial planes while performing infiltrative blocks under ultrasound guidance can be difficult. The exact determination of such planes may beyond the physical limits of common ultrasound machines. Aim of this pilot study was to understand if real-time continuous injection pressure monitoring at the needle tip, combined with ultrasound guidance, can help to immediately and consistently identify an interfascial plane needle tip placement.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Methods<\/jats:title>\n                  <jats:p>We performed four ultrasound-guided transversus abdominis plane (TAP) blocks on fresh cadaver using a modified conventional peripheral nerve block needle. The sensing needle contains Fabry-Perot miniaturized pressure sensor floating at the needle tip, connected to a measuring unit via an optical fiber. Injection-pressure measured at the needle tip was continuously recorded, while the needle was advanced toward the target and 0.9% saline was continuously injected via an electronic pump.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Results<\/jats:title>\n                  <jats:p>A recognizable, recurrent three-peaks injection pressure pattern was identified, while advancing the needle through the abdominal wall, the pressure peaks being identified with the needle to fasciae contact. In four different blocks, a total of 12 peaks and 12 troughs were identified. The mean injection pressure (95%\u2009CI) of the peaks varied substantially from the mean injection pressure of the troughs, from 119.55\u2009kPa (95%\u2009CI 87.3 to 151\u2009kPa) to 30.99\u2009kPa (95%\u2009CI 12.5 to 47.5\u2009kPa), respectively. The peaks (troughs) arose from reproducible pressure curves and were related to the needle tip encountering the muscle fasciae.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Conclusion<\/jats:title>\n                  <jats:p>The identified injection pressure pattern, together with ultrasound image, may help in determine real-time the needle tip position, while performing a TAP block.<\/jats:p>\n               <\/jats:sec>","DOI":"10.1136\/rapm-2023-104550","type":"journal-article","created":{"date-parts":[[2023,7,20]],"date-time":"2023-07-20T12:59:03Z","timestamp":1689857943000},"page":"615-618","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":9,"title":["Identification of interfascial plane using injection pressure monitoring at the needle tip during ultrasound-guided TAP block in cadavers"],"prefix":"10.1136","volume":"48","author":[{"given":"Dossi","family":"Roberto","sequence":"first","affiliation":[{"name":"Anesthesia, Ospedale Regionale di Bellinzona e Valli, Bellinzona, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christian","family":"Quadri","sequence":"additional","affiliation":[{"name":"Anesthesia, Sant Anna Hospital, Sorengo, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xavier","family":"Capdevila","sequence":"additional","affiliation":[{"name":"Anesthesiology and Critical Care Department, Hopital Lapeyronie, Montpellier, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrea","family":"Saporito","sequence":"additional","affiliation":[{"name":"Anesthesia, Ospedale Regionale di Bellinzona e Valli, Bellinzona, Switzerland"},{"name":"Faculty of Biomedical Sciences, USI, Lugano, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2023,7,20]]},"reference":[{"key":"2025101111034772000_48.12.615.1","doi-asserted-by":"publisher","DOI":"10.1046\/j.1365-2044.2001.02279-40.x"},{"key":"2025101111034772000_48.12.615.2","doi-asserted-by":"publisher","DOI":"10.1002\/ca.20621"},{"key":"2025101111034772000_48.12.615.3","doi-asserted-by":"publisher","DOI":"10.1093\/bja\/aen344"},{"key":"2025101111034772000_48.12.615.4","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2044.2009.05933.x"},{"key":"2025101111034772000_48.12.615.5","article-title":"Clinical Impli- cations of the transversus abdominis plane block in adults","volume":"2012","author":"Young","year":"2012","journal-title":"Anesthesiol Res 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method","volume":"73","author":"Quadri","year":"2018","journal-title":"Anaesthesia"},{"key":"2025101111034772000_48.12.615.15","doi-asserted-by":"crossref","first-page":"64","DOI":"10.1111\/anae.14415","article-title":"The effect of the rate of injection pressure profiles measured using in-line and needle tip sensors: an Invitro study","volume":"74","author":"Saporito","year":"2019","journal-title":"Anaesthesia"},{"key":"2025101111034772000_48.12.615.16","doi-asserted-by":"crossref","first-page":"1076","DOI":"10.1007\/s12630-020-01586-8","article-title":"Injection pressure monitoring at the needle tip for detection of perineural and nerve contact position: a cadaver study","volume":"67","author":"Steinfeldt","year":"2020","journal-title":"Can J Anaesth"},{"key":"2025101111034772000_48.12.615.17","doi-asserted-by":"crossref","first-page":"1118","DOI":"10.1111\/anae.14330","article-title":"The ability of a real-time injection pressure monitoring system to discriminate between perineural 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