Department of Cardiology, The Heart Centre, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark.
EuroIntervention. 2010 May;6(1):86-93.
To describe different patterns of stent strut apposition, as visualised with optical coherence tomography.
Strut thicknesses were reconstructed according to the manufacturers' specifications. The stent area (SA) was measured by connecting the reconstructed abluminal surfaces of struts with a trace line, and the vessel wall area (VWA) was estimated from the abluminal strut surfaces, as well as from the lumen border, in cases of struts that were separated from the vessel wall by flush. Strut apposition was evaluated by comparing the SA- and VWA traces. We observed four patterns of strut apposition. Based on these, stent struts could be classified as: (I) apposed struts, (II) struts overlying the ostium of a side branch, (III) malapposed struts that were clearly separated from the vessel wall by flush, and (IV) pseudoapposed struts that were not separated from the vessel wall by visual estimate, but were malapposed in the sense that SA<VWA. Pseudoapposed struts were found in frames with "flower-shaped" lumen contours, and were often surrounded by structures of a lower signal intensity than the rest of the vessel wall.
For a detailed analysis of strut apposition with OCT, we reconstructed strut thicknesses and estimated stent- and vessel wall areas. With this method, we found four types of strut apposition, where pseudoapposed struts constitute a type of struts not previously described. The clinical importance of pseudoapposed struts remains to be settled.
利用光学相干断层扫描（OCT）描述不同的支架梁贴壁方式。
根据制造商的规格重建支架厚度。通过连接重建的支架腔面来测量支架面积（SA），并从腔面支架表面以及支架与血管壁平齐的情况下从管腔边界来估计血管壁面积（VWA）。通过比较 SA 和 VWA 轨迹来评估支架梁的贴壁情况。我们观察到四种支架梁贴壁方式。基于这些方式，可以将支架梁分为：（I）贴壁支架梁，（II）覆盖分支开口的支架梁，（III）与血管壁平齐且明显分离的未贴壁支架梁，以及（IV）虽然没有从血管壁视觉上分离，但根据 SA<VWA 原则仍为未贴壁的假性贴壁支架梁。假性贴壁支架梁见于“花形”管腔轮廓的图像中，且通常被信号强度低于血管壁其余部分的结构所环绕。
为了详细分析 OCT 中的支架梁贴壁情况，我们重建了支架厚度并估计了支架和血管壁面积。使用这种方法，我们发现了四种支架梁贴壁方式，其中假性贴壁支架梁构成了一种以前未描述过的支架梁类型。假性贴壁支架梁的临床意义仍有待确定。
