EVAUATION OF CROSS-SECTIONAL AREA OF CORONARY ARTERIES BY CONDUCTANCE CATHETER : TOWORD ITS APPLICATION TO PTCA

目的探讨电导导管(CC)法测量人体冠状动脉等小血管横截面积(CSA)的可行性。方法用3-FCC(ACC)和血管内超声(AUS)分别测量10条(直径2~10 mm)和10条犬动脉(直径2.3~4.5 mm)的管腔横截面积(CSA)。为了研究平行电导对Ace准确性的影响，将不同电阻率的溶液应用于动脉周围(n=4)。结果Acc与体模模型CsA吻合良好。在切除的动脉中，Acc和AuS高度相关(R2=0.906)。当改变血管周围溶液的电阻率时，不同电阻率的Acc-Aus回归曲线相似。结论电导法用于测量人体冠状动脉等小血管的CSA是可行的。

ObjectivesThe purpose of this study was to evaluate the feasibility of the conductance catheter (CC) method in measuring cross-sectional area (CSA) of small vessels like human coronary arteries.MethodsLumen CSA (A) of phantom tubes (2-10 mm in diameter) and excised canine arteries (n = 10, 2.3-4.5 mm in diameter) were measured with 3-F CC (Acc) and intravascular ultrasound (Aus). To investigate the influence of parallel conductance in accuracy of Ace, solution with various resistivities was applied to the surrounding of the arteries (n = 4).ResultsAcc showed an excellent agreement with phantom model CSA. In the excised arteries, Acc and Aus highly correlated (R2 = 0.906) with each other. When the resistivities of the solution surrounding the vessels was changed, Acc-Aus regression lines were similar regardless of different resistivities.ConclusionsThe conductance method is feasible to measure CSA of small vessels like human coronary arteries.