pulse duration ratio

例句：

1. 1. The doctor measured the patient's pulse duration ratio to determine if he was having a heart attack.
   医生测量了患者的脉搏持续时间比率，以确定他是否正在经历心脏病发作。
2. 2.The study found that the pulse duration ratio could be used as an indicator of heart health.
   研究发现，脉搏持续时间比率可以作为衡量心脏健康的指标。
3. 3. The nurse adjusted the patient's oxygen therapy based on the pulse duration ratio.
   护士根据脉搏持续时间比率调整了患者的氧气疗法。