家兔右心房传导通路的形态学研究及其临床意义

目的　探讨家兔右心房内兴奋传导通路的形态学特征 ,为临床上射频消融治疗某些房性心律失常提供理论依据。方法　对 10例家兔心脏标本进行额状面和水平面连续切片 ,HE、Masson三色和磷钨酸苏木素染色 ,光镜下观察。结果　从窦房结发出了形态上明确的上、下、前、后 4条窦房束 ,1例标本中见过渡细胞绕上腔静脉形成一个完整的环。存在有右房瓣上肌环。房室结与 5条过渡细胞带相连 ,分别为上、左、右、前、后房结束。结论　右心房内可能存在独立的传导系统 ,一些环路的形成可能是房内折返的基础

Morphological study of conductive pathways in rabbit right atrium and it's clinical value

Objective To study the morphological characters of excitation conductive pathways in the right atrium of rabbit.Methods Ten cases of rabbit right atria were cut by serial section of frontal and horizontal planes, stained by HE, Masson trichrome and phosphotungstic acid hematoxylin, then observed under light microscope.Results There were four sinoatrial bundles stemming from sinoatrial nodes (SAN), and transitional cells from SAN formed a perfect conductive circle around the superior vena cava. There was a muscle circle above the tricuspid value circle, including some transitional fibers. Atrioventricular nodes were found to be connected with five transitional bands ,stemming from the superior, the left, the right, the anterior and the posterior artionodal bundles.Conclusion There may be an independent conductive system in right atrium, and some conductive circles may form the morphological basis of reentry.