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Common PCS territories included posterior-inferior-cerebellar-artery (41\/101), pontine perforators (18\/101), multiple-territories (17\/101) and anterior-inferior-cerebellar-artery (7\/101). In PCS, 44\/101 patients had no spontaneous nystagmus. Remaining PCS patients had primary position horizontal (44\/101), vertical (8\/101) and torsional (5\/101) nystagmus. Horizontal nystagmus was 50% ipsiversive and 50% contraversive in lateralised PCS. Most PCS patients with horizontal nystagmus (28\/44) had unidirectional \u201cperipheral-appearing\u201d nystagmus. 32\/101 of PCS patients had gaze-evoked nystagmus. AVN affected the superior, inferior or both divisions of the vestibular nerve in 55\/104, 4\/104 and 45\/104. Most (102\/104) had primary position horizontal nystagmus; none had gaze-evoked nystagmus. Two inferior VN patients had contraversive torsional-downbeat nystagmus. Horizontal nystagmus with SPV\u2009\u2265\u20095.8 \u00b0\/s separated AVN from PCS with sensitivity and specificity of 91.2% and 83.0%. Absent nystagmus, gaze-evoked nystagmus, and vertical-torsional nystagmus were highly specific for PCS (100%, 100% and 98.1%).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Nystagmus is often absent in PCS and always present in AVN. Unidirectional \u2018peripheral-appearing\u2019 horizontal nystagmus can be seen in PCS. ER-based VNG nystagmus assessment could provide useful diagnostic information when separating PCS from AVN.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00415-022-11202-y","type":"journal-article","created":{"date-parts":[[2022,7,18]],"date-time":"2022-07-18T07:02:51Z","timestamp":1658127771000},"page":"632-641","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":26,"title":["Capturing nystagmus in the emergency room: posterior circulation stroke versus acute vestibular neuritis"],"prefix":"10.1007","volume":"270","author":[{"given":"B.","family":"Nham","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"G.","family":"Akdal","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A. 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