| Summary: | <p>Abstract</p> <p>Background</p> <p>Cobalt chromium coronary stents are increasingly being used in percutaneous coronary interventions. There are, however, no reliable data about the characteristics of unfolding and visibility of this stent alloy <it>in vivo</it>. The aim of this study is to compare cobalt chromium coronary stents with conventional stainless steel stents using intracoronary ultrasound.</p> <p>Methods</p> <p>Twenty <it>de novo </it>native coronary stenoses ≤ 20 mm in length (target vessel reference diameter ≥ 2.5 and ≤ 4.0 mm) received under sequential intracoronary ultrasound either a cobalt chromium stent (Multi-Link Vision<sup>®</sup>; n = 10) or a stainless steel stent (Multi-Link Zeta<sup>®</sup>; n = 10).</p> <p>Results</p> <p>For optimal unfolding, the cobalt chromium stent requires a higher balloon deployment pressure (13.90 ± 2.03 atm) than the stainless steel stent (11.50 ± 2.12 atm). Furthermore, the achieved target vessel diameter of the cobalt chromium stent (Visibility-Index QCA/IVUS Multi-Link Vision<sup>®</sup>1.13 / Multi-Link Zeta<sup>® </sup>1.04) is more easily overrated by Quantitative Coronary Analysis.</p> <p>Conclusion</p> <p>These data indicate that stent material-specific recommendations for optimal implantation pressure and different stent material with an equal design should both be considered in interpreting QCA-analysis.</p>
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