tachycardia

例句：

1. 1. He was diagnosed with atrial fibrillation and tachycardia.
   他被诊断出有房颤和心动过速。
2. 2. During the exam, she experienced a sudden drop in heart rate and tachycardia.
   考试期间，她突然心跳骤停并出现心动过速。
3. 3. The patient's condition worsened to the point of requiring immediate medical attention due to tachycardia.
   由于心动过速，患者的病情恶化到了需要立即医疗救治的地步。