Metheds: ELISA was used to test 251 elderly people's BNP level changes in the characteristics of different age groups.
方法：采用ELISA法检测251名不同年龄组非心力衰竭老年人血浆BNP水平，在各年龄组的变化特点。
Metheds: ELISA was used to test 251 elderly people's BNP level changes in the characteristics of different age groups.
方法：采用ELISA法检测251名不同年龄组非心力衰竭老年人血浆BNP水平，在各年龄组的变化特点。
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