[Localized or diffuse reduction in blood flow through the vertebrobasilar arterial system, which supplies the BRAIN STEM; CEREBELLUM; OCCIPITAL LOBE; medial TEMPORAL LOBE; and THALAMUS. Characteristic clinical features include SYNCOPE; lightheadedness; visual disturbances; and VERTIGO. BRAIN STEM INFARCTIONS or other BRAIN INFARCTION may be associated. ( MSH )]
UMLS (ICD9CM) C0042568 Relation/PAR: Brain Ischemia
Relation/CHD: SUBCLAVIAN STEAL SYNDROM