英语语法分析

Objective To investigate the changes of the dendroaspis natriuretic peptide (DNP) levels after severe brain trauma and its relations with the occurrence of hyponatremia and the fluid balance.

目的研究重型颅脑损伤患者血浆树根眼镜蛇尿钠肽（DNP）水平的变化及其与低钠血症及水平衡之间的关系。