[Study of flow-dependent vasodilation of the femoral artery in hypertensive and normal subjects].
Flow dependent vasodilation of brachial artery is not significantly different in hypertensives as compared to normotensives. Since, in vitro, changes in vasomotor tone of large arteries in response to endothelial stimulation may differ depending on the territory, we re-examined phenomenon of flow-dependent vasodilation at the level of the femoral artery in 10 normotensives (NT) and 12 age matched (45 +/- 9 vs 43 +/- 4 yrs) hypertensives (HT). Systolo-diastolic variations of femoral artery diameter (D) were recorded using an original echo-tracking system based on doppler shift while blood flow velocity was measured at the same level using a bidimensional pulsed doppler system (V). A 10 min period of leg ischemia did not induce any significant change in D and V in each group but decreased foot skin blood flow (laser doppler). This decrease occurred to the same extent in NT and HT. During reactive hyperemia following release of the pneumatic cuff, V increased (from 2.1 +/- 0.3 to 12.5 +/- 2.4 cm/s in NT) and returned to control level at the 3rd min. Diastolic diameter (Dd) increased (max: 2nd min) in NT (9.3 +/- 0.8 vs 8.8 +/- 0.9 mm; p less than 0.001) and in HT (9.5 +/- 1.2 vs 8.4 +/- 1.2 mm; p less than 0.01). Dd increased to a greater extent in HT than in NT while reactive hyperemia (laser doppler) did not differ. Thus, a non-invasive method is able to demonstrate a flow-dependent vasodilation at the level of the femoral artery.(ABSTRACT TRUNCATED AT 250 WORDS)
Girerd
X
X
Service de médecine interne et thérapeutique et unité INSERM (U 337), Paris.
Arcaro
G
G
Laurent
S
S
Laloux
B
B
Safar
M
M
D000328:Adult; D001783:Blood Flow Velocity; D005260:Female; D005263:Femoral Artery; D006801:Humans; D006973:Hypertension / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D009131:Muscle, Smooth, Vascular / Q000502:physiology; D012039:Regional Blood Flow; D014654:Vascular Patency; D014664:Vasodilation / Q000502:physiology*
Etude de la vasodilatation flux-dépendante au niveau de l'artère fémorale chez l'hypertendu et le normotendu.