Objective To investigate the effect of nitric acid ester on pulse pressure(PP) in elderly patients with isolated systolic hypertension(ISH).

目的观察硝酸酯类药物对老年单纯收缩期高血压（ISH）患者脉压（PP）的影响。

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Objective to investigate the serum uric acid level in isolated systolic hypertension (ISH) in the elderly, and effect of Losartan potassium.

目的探讨老年收缩期高血压(ish)患者血清尿酸水平的变化及氯沙坦钾的治疗作用。

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