Ichihashi K, Ewert P, Welmitz G, Lange P
Department of Pediatric Cardiology, German Heart Institute Berlin, Germany.
Pediatr Int. 1999 Feb;41(1):8-12. doi: 10.1046/j.1442-200x.1999.01008.x.
To examine the changes in cardiac ventricular and muscle volumes in neonates, echocardiography was performed in 25 normal neonates at 3-5 and 30-35 days after birth.
A standard apical four chamber view and a parasternal short axis view were used for the analysis of the left ventricle. For the analysis of the right ventricle, only an apical four-chamber view was used. A formula based on the area length method was used to calculate the left ventricular and muscle volumes and the single plane Simpson's rule was used for the right ventricular and muscle volumes.
The left ventricular and muscle volumes per body surface did not change during the month following birth. The ratio of the muscle to ventricular volume of the left ventricle was also unchanged. However, the ratios of the right muscle volume to body surface and to the ventricular volume decreased after one month.
The authors suggest that the decreases in pulmonary hypertension and right ventricular stroke volume play a role in the changes of right muscle volume.
为了研究新生儿心室和心肌容积的变化，对25名正常新生儿在出生后3 - 5天和30 - 35天进行了超声心动图检查。
采用标准心尖四腔心切面和胸骨旁短轴切面分析左心室。分析右心室时，仅采用心尖四腔心切面。基于面积长度法的公式用于计算左心室和心肌容积，单平面辛普森法则用于计算右心室和心肌容积。
出生后一个月内，每体表面积的左心室和心肌容积没有变化。左心室心肌与心室容积的比值也未改变。然而，一个月后，右心肌容积与体表面积以及与心室容积的比值下降。
作者认为肺动脉高压的降低和右心室搏出量在右心肌容积的变化中起作用。
