服用乙型阻斷劑（Beta-blockers）的病人，最重要監測的臨床指標為何？

乙型阻斷劑（Beta-blockers）的作用是降低心跳速率（Negative chronotropic effect）與心肌收縮力。給藥前護理師必須評估心率（Heart rate），若心跳過慢（通常 < 60 bpm）或出現心律不整，應暫停給藥並通知醫師，以防引起嚴重心動過緩（Bradycardia）。雖然其有時會影響血糖，但心率是給藥決策中最關鍵的指標。

Beta-blockers act by decreasing heart rate (negative chronotropic effect) and myocardial contractility. Before administration, the nurse must assess the heart rate; if the rate is too slow (typically <60 bpm) or arrhythmias are present, the medication should be withheld and the provider notified to prevent severe bradycardia. Although beta-blockers can affect blood glucose at times, heart rate is the most critical indicator in the administration decision.