1. The patient's heart began to fibrillate uncontrollably, requiring immediate medical attention.
病人的心脏开始无法控制地颤动，需要立即就医。

2. The electrical signals in the heart were causing it to fibrillate irregularly.
心脏中的电信号导致其不规律地颤动。

3. The doctor used a defibrillator to shock the heart back into a normal rhythm when it started to fibrillate.
当心脏开始颤动时，医生使用除颤器将其电击回正常节奏。

4. The patient's ECG showed signs of atrial fibrillation, indicating that the heart was fibrillating.
病人的心电图显示房颤的迹象，表明心脏正在颤动。

5. Excessive caffeine consumption can sometimes cause the heart to fibrillate.
过量摄入咖啡因有时会导致心脏颤动。

6. The new medication helped to regulate the patient's heartbeat and prevent it from fibrillating.
新药物有助于调节病人的心跳，防止心脏颤动。