Abstract
Using a computerized method which quantitatively analyzes overall LV shape and distortion, we recently reported a study in which fetuses and NB had flattening of the septal portion of the LV which tended toward roundness during infancy. Our present study evaluates effects of EC (≤5 sec; n=6), and late (LC)(3 min; n=7) cord clamping on LV shape in NB. Vaginal delivery was accomplished with all infants kept at the same level. NB were studied serially at 8 EC and LC)(all p=ns) were recorded. Mean venous hematocrit for EC was 47±.03%, and for LC was 59±5% (p<.02). Diastolic (d) and systolic (s) 2D standard short axis frames were evaluated. Shape factor (SF) from this method for a circle = 1; for an indented ellipse = 7. Serial LC diastolic septal LV shape distortion was significantly greater than for EC (SFd LC at .5 hour = 5.08±.86 vs SFd EC at .5H=2.91 ±.68, p<.001; SFd LC 10-48 hour = 4.25±.65 vs SFd EC 2.45±.48, p<.01). In systole, LV shapes were all rounder, but SFs in LC was significantly higher than in EC at <.5 hour (3.15 ±.45 vs 2.15±.43, p<.05). Systolic SF data were similar at 10-48 hours (EC=2.15 ±.40; LC=2.3±.48). Placental transfusion significantly alters and distorts LV shape.
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