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In this study, 28 patients were randomly assigned to receive a paravertebral injection of radio\u2010opaque dye (10\u2003ml, with or without co\u2010administration of 20\u2003ml of local anaesthetics) either dorsal or ventral to the endothoracic fascia. The point of injection was determined by use of a nerve\u2010stimulator and the radiographic distribution pattern was assessed blindly by a radiologist. Injections made in the more ventral part of the thoracic paravertebral space, supposedly anterior to the endothoracic fascia, resulted in a multisegmental longitudinal spreading pattern, whereas injections made dorsal to the endothoracic fascia resulted in a less predictable cloud\u2010like spreading pattern, with only limited distribution over adjacent segments. The use of a nerve stimulator\u2010guided technique appears to enhance the likelihood of achieving the more desirable longitudinal spreading pattern.<\/jats:p>","DOI":"10.1111\/j.1365-2044.2004.03705.x","type":"journal-article","created":{"date-parts":[[2004,4,16]],"date-time":"2004-04-16T07:01:46Z","timestamp":1082098906000},"page":"459-463","source":"Crossref","is-referenced-by-count":97,"title":["Varying anatomical injection points within the thoracic paravertebral space: effect on spread of solution and nerve blockade"],"prefix":"10.1111","volume":"59","author":[{"given":"M. Z.","family":"Naja","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M. F.","family":"Ziade","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M. El","family":"Rajab","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"K. 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