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Assessment of Collateral Function by New Invasive Coronary Impedance and Conductance Parameters

机译:通过新的侵入性冠状动脉阻抗和电导参数评估侧支功能

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In 91 patients (mean age 65 ± 10 years, 69 male) with total chronic occlusion of a major coronary artery collateral function was assessed invasively by Doppler flow and pressure recordings proximal and distal to the occlusion before recanalization. We determined form parameters of the Doppler flow profile (systolic, diastolic and combined flow), the constant part of the complex impedance, the frequency dependent impedance, the average of the time-resolved conductivity and the total blood flow over one cycle. Collateral morphology was assessed angiographically by the Rentrop grading, by Levins anatomic location classification and by the grading of collateral connections according to Werner. In patients with reduced left ventricular function a correlation was observed between the anatomical locations and the function of collateral pathways. On the basis of Receiver Operating Characteristics the frequency dependent parameters of collateral hemodynamics were comparable to simplified averages for subgroup analysis. The simplified averages of collateral hemodynamics were sufficient for quantitative assessment of collateral function.
机译:在再通气之前,通过多普勒血流和阻塞附近和远端的压力记录,对91名患者(平均年龄65±10岁,男性69位)全部慢性阻塞主要冠状动脉的侧支功能进行了侵入性评估。我们确定了多普勒血流曲线的形式参数(收缩,舒张和合并血流),复数阻抗的恒定部分,频率相关阻抗,时间分辨电导率的平均值和一个周期内的总血流量。根据伦特(Rentrop)分级,莱文斯(Levins)解剖学位置分类以及根据维尔纳(Werner)进行的侧支连接分级,对血管侧支形态进行了血管造影评估。在左心室功能降低的患者中,观察到解剖位置与侧支通路功能之间的相关性。根据接收器的工作特性,附带血流动力学的频率相关参数与亚组分析的简化平均值相当。侧支血流动力学的简化平均值足以定量评估侧支功能。

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