Vertebrobasilar insufficiency classification

There isn’t classification about the VBI yet, but there are three phenotypes of the basilar artery occlusion depending on the modal of initial symptoms.

• phenotype 1: patients present progressive brain stemsymptoms(for example: vertigo, doublevision, dysarthria, hemiparesis, or paresthesia) without any prodromal symptoms.^[1]
• phenotype 2: patients present nonspecific, such as nausea, tinnitus, hearing loss, and vertigo, which can precede the onset of the monophasic, progressive deficits by days, but typically by several weeks.^[2][3]
• phenotype 3: patients present symptoms with onset of severe, often bilateral motor weakness, ophtalmoplegia, and coma. The patients may have a severe outcome if basilar artery cannot be recanalized fast.^[1]

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