title: [Influence of age on several parameters of the Doppler signal at the carotid level (author's transl)].
abstract: Doppler recordings are an interesting method of exploration of the circulatory system and more information can be obtained than is generally accepted. This study demonstrates the influence of age on the Doppler signal treated in 3 different ways. This is done in order to obtain supplementary criteria if possible, which can be used to assess arterial aging and its possible pathological character. The results show the dispersion of the resistance index R after 50 years of age, many subjects having an increased index. The influence of various factors such as hypertension, smoking..., are analyzed. Particular attention is drawn to the morphological changes in the curve. Hard echos that are usually filtered are specifically analyzed. These represent the reflexion of ultrasounds on the arterial wall and it could be possible to obtain information on flow rate and vessel wall elasticity. Preliminary results show important variations of the signal with age. Doppler recordings from the carotid vessels can be used to follow, in an approximate manner, the rapid variations of cerebral blood perfusion. The during of circulatory disturbance was studied when the cerebral circulation was exposed to a particular situation requiring rapid adaptation: in this case the squatting-standing test. Large differences were observed according to age.
mesh_terms: D000328:Adult; D000368:Aged; D000375:Aging; D002339:Carotid Arteries / Q000502:physiology*; D002560:Cerebrovascular Circulation; D004301:Doppler Effect; D006801:Humans; D008875:Middle Aged; D010296:Parietal Lobe / Q000502:physiology; D011187:Posture; D014463:Ultrasonography
vernacular_title: Influence de 'alge sur quelques paramètres du signal Doppler au niveau du système carotidien.