• Lidija Dežmalj-Grbelja, Ivan Mikula, Lejla Ćorić, Maristela Stojić, and Vida Demarin.
• 1Department of Neurology, Sestre milosrdnice University Hospital Centre, Zagreb, Croatia; 2Sveta Katarina Polyclinic, Zagreb, Croatia; 3Department of Neurology, Dubrava University Hospital, Zagreb, Croatia; 4Croatian Academy of Sciences and Arts, Zagreb, Croatia.
• Acta Clin Croat. 2021 Mar 1; 60 (1): 10-15.

AbstractThe aim was to determine differences of blink reflex in clinically definite multiple sclerosis (CDMS) and clinically isolated syndrome (CIS) in patients presented with symptoms and signs of brainstem impairment. The study included 20 patients diagnosed with CDMS, 20 with CIS, and 20 healthy controls. We recorded latencies of early (R1) and late component ipsilaterally (R2) and contralaterally (R2'), and occurrence of irritative component (R3). We analyzed data on sex, age, signs of brainstem impairment and magnetic resonance imaging (MRI) findings for the presence of brainstem demyelinating lesions. There was no statistically significant difference between patient groups according to sex, age, symptoms of brainstem involvement and MRI findings. There was no statistically significant difference in R1 component latencies and R2 latencies on the right side. Latencies of R2 on the left and R2' on the right were statistically longer in CDMS group. There was no difference in the appearance of R3 component. In conclusion, blink reflex was found to be a very sensitive and useful diagnostic tool in the assessment of brainstem structures, especially because abnormalities are seen not only in CDMS but also in CIS. Slowing of the late component as a sign of dysfunction in the efferent part of the reflex arc is not very specific but is a highly sensitive finding.

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