text: [The assessment of flow velocity in carotid and intracranial arteries in three different age groups].
  In this report we assess the systolic maximal flow velocity in carotid and intracranial arteries in 191 subjects with no history of cerebral vascular disease in 3 age groups: 20-40 years (1 group), 41-60 years (2 group), and above 60 years (3 group). The subjects were assessed using Sonomed Transcranial Doppler Spectrograph according to generally accepted principles. The purpose of the study was to establish the mean value of maximal flow velocity in each particular artery in three age groups, and to observe the changes in this parameter with age. The results were analyzed using statistical methods and a significant decrease in blood flow, Vmax, was found in all investigated arteries. A mean decrease of 8.02% in flow velocity Vmax was found, when comparing groups 2 and 1, and difference 15.99% comparing 3 and 1.
  
entities: ['intracranial arteries']
entities: Multi-tissue_structure
entities: PMID-9770688_T1
entities: ['intracranial arteries']
entities: Multi-tissue_structure
entities: PMID-9770688_T2
entities: ['cerebral vascular']
entities: Multi-tissue_structure
entities: PMID-9770688_T3
entities: ['blood']
entities: Organism_substance
entities: PMID-9770688_T4
entities: ['arteries']
entities: Multi-tissue_structure
entities: PMID-9770688_T5
entities: ['carotid']
entities: Multi-tissue_structure
entities: PMID-9770688_T6
entities: ['carotid']
entities: Multi-tissue_structure
entities: PMID-9770688_T7
entities: ['artery']
entities: Multi-tissue_structure
entities: PMID-9770688_T8