Late outcome of sirolimus-eluting stents: comparison of multidetector computed tomography with quantitative coronary angiography and intravascular ultrasound

Objective: To assess the performance of multidetector computed tomography in determining late clinical outcomes of patients undergoing sirolimus-eluting stent implantation.Methods: Thirty patients, successfully submitted to sirolimus-eluting stent implantation for more than six months, were

selected to participate in the study. All underwent invasive angiography and intravascular ultrasound following CT angiography

using iodinated contrast medium at a dose of 1.5 ml/kg.Results: Mean proximal reference diameter was 3.01 ± 0.31 mm by tomography and 3.14 ± 0.31 mm by angiography (p

= 0.04). When the left circumflex artery was excluded from the analysis, the difference between both examinations was

no longer significant (tomography = 3.01 ± 0.32 mm; angiography = 3.10 ± 0.30 mm, p = 0.65). Mean distal reference

diameter was 2.86 ± 0.30 mm by tomography and 2.92 ± 0.32 by angiography (p = 0.25). Mean in-stent minimal lumen

diameter was 2.85 ± 0.25 mm by tomography and 2.85 ± 0.29 mm by angiography (p = 0.27). Mean minimal in-stent crosssectional

area was 7.19 ± 1.47 mm2 by tomography and 6.90 ± 1.52 mm2 by intravascular ultrasound (p = 0.36), but there

was only a weak correlation between these measurements (r = 0.33).Conclusion: Computed tomography allows the qualitative assessment of sirolimus-eluting stents, accurate estimate of proximal

and distal reference diameters of the target vessel, and in-stent minimal lumen diameter. Its correlation with measurements

performed using intravascular ultrasound, however, is less strong.