"Even then he stood there, hidden wholly in that kindness which is night, while the uprising fumes filled the room. When the odor reached his nostrils, he quit his attitude and fumbled for the bed. ’What’s the use’ he said, weakly, as he stretched himself to rest. " The above is quoted from Theodore Dreiser’s Sister Carrie. Briefly tell the situation that leads to Hurstwood’s suicide and interpret his final words—"What’s the use".

诊断心房颤动的是（）

A.P-P间期逐渐缩短直到P波受阻，QnS波群脱落

B.P波消失，代之以间距，振幅不等的畸形波，频率360次／分，QRS波正常，律绝对不规则

C.P-P间期显著延长，长间歇与正常P-P无倍数关系

D.P-P间期显著延长，长间歇与正常P-P成倍数关系

E.QRS波正常，频率190次／分，其前有固定关系P波，P-P间期为0.16秒