目的研究二尖瓣狭窄程度与左房充盈分数的关系。
Objective To study the relationship between the degree of mitral stenosis (MS) and atrial filling fraction (AFF).
结果是否强制固定患儿、患儿血管显现程度、充盈度、家长陪伴人数对穿刺一次成功率有影响（P<0。01或P<0。05）。
Result Compelling restraint, the clearness and filling degree of the vein, numbers of accompanying were related to the success rate of intravenous infusion(P<0.01 or P<0.05).
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