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为探讨房室结动脉（ＡＶＮＡ）的形态特征及其与房室结的解剖关系，对１００例患者冠状动脉造影时分别在左前斜位６０°和右前斜位３０°观察ＡＶＮＡ的解剖学形态。结果：９３例患者观察到了清晰的ＡＶＮＡ；ＡＶＮＡ的直径为０．６±０．２ｍｍ，ＡＶＮＡ的长度、直径与右冠状动脉的直径不成正比；６８％的患者ＡＶＮＡ指向快径区、３２％指向慢径区。观察结果提示ＡＶＮＡ直径比较细小、形态变异度大；对房室结的解剖学慢径区域进行射频消融时，有可能损伤ＡＶＮＡ，从而造成Ⅲ度房室阻滞。
To investigate the morphological characteristics of AVN and its anatomic relationship with atrioventricular node (AVN), the anatomic features of AVNA were observed at 60 ° left anterior oblique and 30 ° anterior oblique respectively in 100 patients undergoing coronary angiography. Results: A clear AVNA was observed in 93 patients. The diameter of AVNA was 0.6 ± 0.2 mm. The length and diameter of AVNA were not proportional to the diameter of right coronary artery. AVNA pointed to the fast pathway and 68% Slow zone. Observations suggest that AVNA is relatively small in diameter and has a high degree of morphological variability; radiofrequency ablation of the anatomic slow-pathway region of the AV node may impair AVNA, resulting in a third-degree AV block.