prolonged P-R interval

例句：

1. 1. The patient's heart rate has been prolonged during the procedure.
   患者在手术过程中心率有所延长。
2. 2. The prolonged P-R interval may indicate a problem with the heart rhythm.
   延长的P-R间期可能表明心脏节律有问题。
3. 3.The prolonged P-R interval is often associated with arrhythmias.
   延长的P-R间期通常与心律失常有关。