Secondary stroke prevention decreases subsequent stroke and therefore disability.
Posterior circulation of the brain consists of 2 vertebral arteries, 1 basilar artery, 2 posterior cerebral arteries and their branches.
Absence of collateral function due to hypoplasia or stenosis of collateral arteries may lead to a higher risk of stroke in patients with severe internal carotid artery occlusive disease
Anterior circulation of the brain comprises of internal carotid artery and its branches.
Retinal vein occlusion is the blockage of one of the main veins of the retina and is one of the commonest retinal vascular occlusive disorders, usually associated with a variable degree of visual loss
There are three major categories of seizures: 1) Epileptic seizures (ES), 2) Psychogenic Nonepileptic Seizures (PNES), 3) Physiologic nonepileptic events (NEEs). PNES/NESS are can be difficult to distinguish from ES.