Objective: To discuss the antihypertensive effect and the influence of carvedilol on plasma endothelin (ET) and nitric oxide (NO) in essential hypertension (EH) patients.

• 摘要目的：观察国产卡维地洛的降压疗效及其对高血压患者血浆一氧化氮(NO)、内皮素(ET)含量的影响。