This effect of fenoldopam was markedly blocked by specific DA 1 receptor antagonist SCH23390, but not at all by specific DA 2 receptor antagonist domperidone.

• 选择性DA1受体阻断剂SCH2 3390可以显著阻断fenoldopam的效应 ,而DA2 受体阻断剂domperidone则对fenoldopam的这一效应不产生任何影响。