ORIGINAL ARTICLES   

International Angiology 1999 December;18(4):263-70

Copyright © 2000 EDIZIONI MINERVA MEDICA

language: English

Intravascular ultrasound observations during iliac stent deployment

Kuribayashi S., Takamiya M., Homma S.

From the Department of Radiology and Cardiology *, National Cardiovascular Center, Osaka, Japan.

Background. To eval­u­ate the role of intra­vas­cu­lar ultra­sound (IVUS) dur­ing iliac stent deploy­ment, with com­par­i­son of four major types of iliac ­stents.
Methods. Thirty-eight iliac arter­ies of 37 ­patients were ­observed with intra­vas­cu­lar ultra­sound after implan­ta­tion of var­i­ous ­stents includ­ing Palmaz ­stents in 10, Memotherm ­stents in 11, Wallstent in 10, and Strecker ­stents in 7. Quantitative meas­ure­ments on ultra­sound includ­ed the ratio of the short-axial to the long-axial diam­e­ters of the stent (sym­me­try index), the ratio of stent cross-sec­tion­al area to that of the ref­er­ence lumen (expan­sion index), and stent-to-wall appo­si­tion.
Results. Intravascular ultra­sound ­revealed sig­nif­i­cant dif­fer­enc­es among four major types of iliac stent, in spite of sat­is­fac­to­ry angio­graph­ic appear­anc­es in all ­patients. It dem­on­strat­ed sig­nif­i­cant defor­mity of the Strecker stent (sym­me­try index of 0.76±0.09) com­pared with other ­stents. The Memotherm stent and the Palmaz stent were super­i­or to other ­stents in terms of ­degree of expan­sion (mean expan­sion index of 0.87 and 0.82 respec­tive­ly). Stent cross-sec­tion­al area great­er than 80% of the ref­er­ence lumen could be suf­fi­cient for iliac stent deploy­ment. The Palmaz stent was super­i­or to other ­stents in terms of stent-to-wall appo­si­tion.
Conclusions. Intravascular ultra­sound can pro­vide pre­cise and use­ful cross-sec­tion­al mor­pho­log­i­cal and quan­ti­ta­tive infor­ma­tion in terms of stent con­fig­u­ra­tion, ­degree of stent expan­sion, and stent-to-wall appo­si­tion.