Abstract
Objective
Many patients attending the emergency room (ER) with vertigo, leave without a diagnosis. We assessed whether the three tools could improve ER diagnosis of vertigo.
Methods
A prospective observational study was undertaken on 539 patients presenting to ER with vertigo. We used three tools: a structured-history and examination, nystagmus video-oculography (VOG) in all patients, additional video head-impulse testing (vHIT) for acute-vestibular-syndrome (AVS).
Results
In the intervention-group (n = 424), case-history classified AVS in 34.9%, episodic spontaneous-vertigo (ESV 32.1%), and episodic positional-vertigo (EPV 22.6%). In AVS, we employed “Quantitative-HINTS plus” (Head-Impulse, Nystagmus and Test-of-Skew quantified by vHIT and VOG, audiometry) to identify vestibular-neuritis (VN) and stroke (41.2 and 31.1%). vHIT gain ≤ 0.72, catch-up saccade amplitude > 1.4○, saccade-frequency > 154%, and unidirectional horizontal-nystagmus, separated stroke from VN with 93.1% sensitivity and 88.5% specificity. In ESV, 66.2 and 14% were diagnosed with vestibular migraine and Meniere’s Disease by using history and audiometry. Horizontal-nystagmus velocity was lower in migraine 0.4 ± 1.6○/s than Meniere’s 5.7 ± 5.5○/s (p < 0.01). In EPV, benign positional vertigo (BPV) was identified in 82.3% using VOG. Paroxysmal positional-nystagmus lasting < 60 s separated BPV from non-BPV with 90% sensitivity and 100% specificity. In the control group of ER patients undergoing management-as-usual (n = 115), diagnoses included BPV (38.3%) and non-specific vertigo (41.7%). Unblinded assessors reached a final diagnosis in 90.6 and 30.4% of the intervention and control groups. Blinded assessors provided with the data gathered from each group reached a diagnosis in 86.3 and 41.1%.
Conclusion
Three tools: a structured-assessment, vHIT and VOG doubled the rate of diagnosis in the ER.
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Data availability
Data not published within the article will be available in a public repository and anonymized data will be shared by request from any qualified investigator.
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Funding
This research was funded by the Garnett Passe and Rodney Williams Memorial Foundation and the National Health and Medical Research Council of Australia.
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B. Nham, N. Reid, K. Bein and A.P. Bradshaw have no disclosures relevant to this manuscript. L.A. McGarvie is an unpaid consultant for Otometrics. E.C. Argaet, A.S. Young and S.R. Watson have no disclosures relevant to this manuscript. G.M. Halmagyi is an unpaid consultant for Otometrics. D.A. Black and M.S. Welgampola have no disclosures relevant to this manuscript.
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This study received local ethics committee approval for the use of human participants (Protocol X13-0425 and HREC/13/RPAH/591) and written informed consent was obtained from all participants in accordance with the Helsinki Declaration of 1964.
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Nham, B., Reid, N., Bein, K. et al. Capturing vertigo in the emergency room: three tools to double the rate of diagnosis. J Neurol 269, 294–306 (2022). https://doi.org/10.1007/s00415-021-10627-1
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DOI: https://doi.org/10.1007/s00415-021-10627-1