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be·ta-block·er AHD[bāʹtə-blŏk'ər, bēʹ-] D.J.[ˈbeɪtəˌblɒkə, ˈbiː-]K.K.[ˈbetəˌblɑkɚ, ˈbi-]n.Physiology（名词）【生理学】- A drug, such as propanolol, that opposes the excitatory effects of norepinephrine released from sympathetic nerve endings at beta-receptors and is used for the treatment of angina, hypertension, arrhythmia, and migraine. Also called beta-adrenergic blocking agent β-神经阻滞剂：对抗从β-肾上腺素受体的交感神经未稍释放的去甲肾上腺素兴奋作用一种药，如萘心安，用于治疗心绞痛、高血压、心律不齐和周期性偏头痛 也作 beta-adrenergic blocking agent
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