Abstract

Vertebrobasilar insufficiency clinical diagnosis is based on the presence of two or more of the certain signs and symptoms like homonymous hemianopsia, dysarthria, diplopia and motor or sensory symptoms or both of them. Occipital cortex ischemia causes homonymous hemianopsia and lower brainstem ischemia causes dysarthria while upper brainstem ischemia causes diplopia. Dizziness, drop attack, dysarthria, diplopia and visual defect are commonly seen in vertebrobasilar insufficiency [1]. Vertebral artery occlusion at the atlasaxis level may cause vertebrobasilar insufficiency during turning the head. In the patients with vertebrobasilar insufficiency, positional changes may cause dizziness which is episodic and transient in nature [2].