Acute recoil in sirolimus eluting stent: real time, in vivo assessment with optical coherence tomography

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Abstract
Panels A and B illustrate the principle. The dedicated OCT imaging wire (diameter 0.014 inch; light source 1300 nm; LightLab Imaging LLC, Westford, Massachusetts, USA) is introduced into the guidewire shaft of an over-the-wire balloon. Cross sectional images of the artery are obtained by imaging through the inflated balloon (mixture of contrast medium and saline). Panels C, D, and E demonstrate the OCT findings during postdilatation of the stent (Cypher 3.0 mm diameter/18 mm length; Cordis, Johnson & Johnson, Warren, New York, USA). The balloon (3.0 mm diameter, Open sail, Guidant, Diegem, Belgium) was stepwise inflated at 9 atm and 22 atm and then deflated to a pressure of 5 atm with the OCT imaging wire in place. At each pressure level, the maximum stent diameter was measured online by OCT. Stent diameter was 3.04 mm at 9 atm, increased to 3.50 mm at 22 atm, and decreased to 2.94 mm immediately after deflating the balloon to 5 atm. This corresponds to acute stent recoil of 16%.

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