Results The pulmonary venous flow patterns were recorded in 23 of 25 subjects with ASD.Continuous antegrade wave replaced normally occurring S and D waves in all ASD patients.

• 结果2例患者肺静脉血流显示不满意,其余23例患者术前肺静脉血流频谱的前向血流缺失正常时肺静脉血流的S波和D波,而表现为一连续的、较平坦的波形,其负向的A波也较正常时减小,部分患者A波甚至消失。