1. A premature contraction of the heart, resulting in momentary cardiac arrhythmia. 
   期外收缩心脏房室的过早心搏，导致短暂的心律不齐
2. any of various drugs used in treating hypertension or arrhythmia; decreases force and rate of heart contractions by blocking beta-adrenergic receptors of the autonomic nervous system. 
   用来治疗高血压和心律不齐的药物；通过阻止神经系统肾上腺接受器来减少心脏收缩力的药物。
3. a beta blocker (trade name Lopressor) used in treating hypertension and angina and arrhythmia and acute myocardial infarction; has adverse side effects (depression and exacerbation of congestive heart failure etc.). 
   一种用来治疗高血压、咽绞痛、心律不齐和心肌梗塞的受体阻滞药；有副作用（低压和心肌梗塞）。
4. any of a class of drugs that block the flow of the electrolyte calcium (either in nerve cell conduction or smooth muscle contraction); can be used in the treatment of angina or arrhythmia or hypertension or migraine. 
   阻止钙液（促使神经元传导或润滑肌肉收缩）流动的药物；用来治疗咽绞痛、心律不齐、高血压和偏头痛。

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