Mechanical Behavior to Overexpansion of Cobalt Chromium Compared with Stainless Steel Stents in the Abdominal Aorta of Hypercholesterolemic Rabbits

FERNANDEZ, ALEJANDRO; MELE, ESTEBAN; RENOU, SANDRA JUDITH; OLMEDO, DANIEL GUSTAVO

Revista Argentina de Cardiologia

Argentine Society of Cardiology

Lugar: Buenos Aires; Año: 2018 vol. 86 p. 167 - 171

Objectives: The aim of this study was to analyze the behavior to overexpansion of cobalt chromium stents compared with stainlesssteel stents.Methods: Twenty New Zealand rabbits were used, fed with a diet supplemented with 1% cholesterol. Animals were divided into twogroups. Group 1 (n=10) received 3.0 mm cobalt chromium stents overexpanded at 20 atmospheres and group 2 (n=10) 3.5 mm stentsdeployed at 10 atmospheres. These stents were compared with a previous series of 20 animals with stainless steel stents, dividedinto the same two groups. A third group with conventional diet was used as control. Intravascular ultrasound (IVUS) was performedto assess the degree of elastic recoil and also the degree of symmetry using ?intertrust angles?.Results: In group 1 of cobalt chromium stents, mean elastic recoil was 0.11±0.13 mm, (3.21% recoil) and in group 2 this was0.3±0.12 mm, (8.26% recoil) (p=0.002). In group 1 of stainless steel stents mean elastic recoil was 0.28±0.18 mm (8.21% recoil) andin group 2 this was 0.10±0.11 mm (2.79% recoil) (p