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However, the cause of dysphagia development by halo-vest fixation is not yet clear. We therefore investigated the incidence of dysphagia and cervical alignment as well as clinical data from medical charts in patients treated with a halo-vest brace.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Methods<\/jats:title>\n<jats:p>We retrospectively reviewed clinical data from the medical charts of 49 patients who had undergone halo-vest fixation. Occipito (O)-C2 angle, C2-C6 angle, and pharyngeal inlet angle were assessed by lateral plain X-rays of the cervical spine. The impacts of these parameters on incidence and severity of dysphagia were analyzed.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Results<\/jats:title>\n<jats:p>Thirteen patients (32%) suffered from dysphagia during halo-vest fixation, and age and length of intensive care unit (ICU) stay were greater in the dysphagia group (<jats:italic>p<\/jats:italic>\u2009=\u20090.044 and 0.013, respectively) than in those who did not develop dysphagia. O-C2 angle was smaller in the dysphagia group (<jats:italic>p<\/jats:italic>\u2009=\u20090.016). After multivariate logistic analysis, body mass index, ICU stay, and O-C2 angle remained as independent risk factors related to incidence of dysphagia. Spearman rank correlation showed a negative correlation between ICU stay and Food Intake Level Scale (FILS) (<jats:italic>p<\/jats:italic>\u2009=\u20090.026), and a positive correlation between O-C2 angle and FILS (<jats:italic>p<\/jats:italic>\u2009=\u20090.008).<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Conclusion<\/jats:title>\n<jats:p>This study suggested that O-C2 angle is related to both incidence and severity of dysphagia due to halo-vest fixation.<\/jats:p>\n<\/jats:sec>","DOI":"10.1186\/s12891-020-3155-2","type":"journal-article","created":{"date-parts":[[2020,2,28]],"date-time":"2020-02-28T20:04:29Z","timestamp":1582920269000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Role of O-C2 angle in the development of dysphagia in patients with halo-vest fixation"],"prefix":"10.1186","volume":"21","author":[{"given":"Midori","family":"Miyagi","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hiroshi","family":"Takahashi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kazuaki","family":"Tsuchiya","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hideki","family":"Sekiya","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3574-649X","authenticated-orcid":false,"given":"Satoru","family":"Ebihara","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2020,2,28]]},"reference":[{"issue":"3","key":"3155_CR1","doi-asserted-by":"publisher","first-page":"332","DOI":"10.2106\/00004623-197759030-00007","volume":"59","author":"RM Johnson","year":"1977","unstructured":"Johnson RM, Hart DL, Simmons EF, Ramsby GR, Southwick WO. 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The study protocol was approved by the Ethics Committee of Toho University Omori Medical Center (No. 27\u2013279). Informed consent was obtained from all individual participants included in this retrospective study by the opt-out consent process.","order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Not applicable.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare that they have no competing interests.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"131"}}