title: Histological examination of vascular lesions caused by stent implantation in humans and in comparative experimental animal model.
abstract: A comparative analysis of human and experimental animal (canine) tissues was performed to characterize and describe cellular and histological responses during the processes of newly forming intravascular tissues after stent implantation. Routine histological and immunohistochemical evaluation of 20 human samples and 9 samples from animal models were used one day, one week and one month after the stent implantation. After one day of implantation, there was no difference between the human and canine peripheral arteries, suggesting a similar cellular and histological response in the early phase. In contrast, after one week of implantation, during the proliferative phase the repairing human tissue showed less intensive production of inflammatory cells and more intensive increase in number of vascular cells than did the canine model. In addition, cellular changes normally restituted by the end of one month in canine peripheral arteries, but vascular cells persisted in human atherosclerotic arteries. In conclusion, results of this study suggest differences in both phases of vascular repair in the post-stented period, because both proliferative and regressive phases showed histological differences in canine and human samples. In canine, the restitution of vascular wall was completed by the end of first month but persistent vascular cell proliferation was visible in the human peripheral arteries. It can be suggested that delayed cellular response might indicate restenosis but also can be considered considered as a progression of the original arterial disease.
authors.affiliation: Department of Vascular Surgery, University of Pécs, Hungary.
authors.forename: G
authors.initials: G
authors.lastname: Kasza
authors.forename: L
authors.initials: L
authors.lastname: Kollár
authors.forename: Erzsébet
authors.initials: E
authors.lastname: Rőth
authors.forename: A
authors.initials: A
authors.lastname: Vincze
authors.forename: Eva
authors.initials: E
authors.lastname: Gömöri
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000818:Animals; D001808:Blood Vessels / Q000473:pathology*; D004285:Dogs; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D023421:Models, Animal; D015607:Stents / Q000009:adverse effects*; D017539:Tunica Intima / Q000473:pathology; D014656:Vascular Surgical Procedures