The peak velocities of the early systolic reversal wave (PVR) and the systolic forward wave (PVS) were measured. The relationships between the preceding R-R intervals and PVR, PVS were analyzed.
应用经食管超声心动图测量肺静脉血流频谱曲线收缩早期逆向R波峰值流速（PVR）和收缩期S波峰值流速（PVS） ，分析PVR和PVS与其前心电图R R间期的关系。
Their heart rates slowed down, P R and Q T intervals prolonged and blood pressure reduced after exposure, as compared with those before exposure.
工人接触后心电图指标与接触前自身比较，出现心率减慢、PR间期和QT间期延长及血压下降。
Their heart rates slowed down, P R and Q T intervals prolonged and blood pressure reduced after exposure, as compared with those before exposure.
工人接触后心电图指标与接触前自身比较，出现心率减慢、PR间期和QT间期延长及血压下降。
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