An atrialsound is not heard in this condition because mitral valve narrowing prevents sudden emptying of the left atrium.
心房音此时不能听到，因为二尖瓣狭窄阻止左心房突然排空。
2
Methods Korotkoff sound method and modified method were performed in 69 male patients to respectively take blood pressure of left upper arm during atrial fibrillation.