frequent occurrence of ventricular premature beats

• 室性期前收缩；频发

frequent occurrence of ventricular premature beats的用法和样例：

例句

1. Long-term isoproterenol infusion also induced premature entricular contractions and atrioentricular heart block in junctin-null mice.
   长期异丙肾上腺素输入也可在连接素缺陷小鼠诱发室性期前收缩和房室传导阻滞。
2. Palpitation from frequent extrasystoles or other arrhythmia is common.
   来自频发的期前搏动或其他心律不齐的心悸亦属常见。
3. The frequent war disasters have repeatedly damaged the environment, impeded the development of its society and economy.
   几千年来，频发的战争严重破坏了徐州地区的生态环境和社会经济，阻碍了古城徐州的发展。