Central nystagmus plus ABCD2 identifying stroke in acute dizziness presentations.

ABSTRACT

OBJECTIVE: The objective was to explore the ability of head impulse-nystagmus-test of skew (HINTS) combined with ABCD2  score to identify cerebrovascular causes of dizziness. MATERIALS AND METHODS: We prospectively recruited 85 patients with acute onset of dizziness from September 2016 to December 2018 and analyzed their clinical characteristics, ABCD2  scores, HINTS, and neuroimages data. RESULTS: Acute stroke was identified by MRI in 21 of 85 patients. The mean ± SD ABCD2  scores were significantly higher among patients with acute stroke than those without acute stroke (4.0 ± 0.8 h vs. 2.5 ± 0.7 h, p < 0.01). The majority (71.4%) of patients with cerebrovascular causes had central pattern of nystagmus at the initial 48 h from symptoms onset. The sensitivity and specificity of HINTS were 100% and 87% for the presence of stroke in patients with nystagmus. When combined central pattern of nystagmus and ABCD2  ≥ 4, the sensitivity increased to 100% for identifying cerebrovascular causes. Nystagmus were absence at time of examination in 16.5% of our patients, and ABCD2  scores in patients who had cerebrovascular diagnoses were all ≥ 4. CONCLUSION: HINTS examinations could efficiently differentiate stroke from nonstroke under the condition that patients remaining symptomatic, including spontaneous or gaze-evoked nystagmus. It is more practical to apply the combination of central pattern of nystagmus and ABCD2  ≥ 4 in ED setting. If patients were absence of central nystagmus at admission, cerebrovascular event should be a priority diagnosis when their ABCD2  ≥ 4.