presystole

例句：

1. 1. During the presystolic phase, the heart rate increases gradually.
   在预收缩期，心率逐渐增加。
2. 2.The doctor explained that the patient's presystolic pressure was elevated.
   医生解释说，患者的预收缩压升高了。
3. 3.The study found that presystolic blood pressure is an important indicator of cardiovascular risk.
   研究发现，预收缩血压是心血管风险的重要指标。