Betablockers halt this process by blocking adrenaline receptors and slowing the heart rate.
阻断肾上腺素的这种正性肌力作用，减缓心率。
2
The actual utilization rate of betablockers(BB)and angiotensin-converting enzyme inhibitors(ACEI)was 49.4 and 65.4, respectively.
受体阻滞剂（BB）和血管紧张素转换酶抑制剂（ACEI）的实际使用率分别为49·4%、65·4%。
3
Even certain medications can trigger asthma: aspirin and other non-steroid anti-inflammatory drugs, and beta-blockers (which are used to treat high blood pressure, heart conditions and migraine).