Acute changes in aortic wall mechanical properties after stent placement in rabbits.
J Vasc Interv Radiol
; 11(5): 634-8, 2000 May.
Article
en En
| MEDLINE
| ID: mdl-10834497
ABSTRACT
PURPOSE:
To evaluate mechanical property changes after endovascular stent placement in small-diameter arteries. MATERIALS ANDMETHODS:
Self-expanding stents (Wallstent) were placed in the infrarenal aorta of five New Zealand White rabbits via a surgical right femoral approach. Blood pressure changes (deltaP) were monitored in the aorta. Blood flow velocity was measured with a 20-MHz, pulsed Doppler probe (n = 4) to calculate the pulsatility index. Aortic diameter (dA) and diameter changes (delta(d)) were measured with a 20-MHz probe in echo-tracking mode. Diameter compliance (Cd) and distensibility coefficient (DC) were calculated as Cd = 2(delta)d/(delta)P and DC = 2delta(d)/delta(P)/dA.RESULTS:
Aortic diameter increased from 3.360 +/- 0.4033 mm to 4.020 +/- 0.3033 mm after stent placement at the stent level only. Compliance decreased from 77.644 +/- 24.306 mm kPa(-1) to 31.150 +/-8.245 x 10(-3) mm kPa(-1) at the stent level, and was then significantly lower than upstream (98.500 +/- 53.196 mm kPa(-1)) and down-stream (59.047 +/- 13.833 mm kPa(-1)). There was no significant change in pulsatility index.CONCLUSIONS:
Endovascular stent placement produces a significant decrease in arterial wall compliance of the rabbit abdominal aorta.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Aorta Abdominal
/
Prótesis Vascular
/
Stents
Tipo de estudio:
Evaluation_studies
Límite:
Animals
Idioma:
En
Revista:
J Vasc Interv Radiol
Asunto de la revista:
ANGIOLOGIA
/
RADIOLOGIA
Año:
2000
Tipo del documento:
Article
País de afiliación:
Francia