It was strange that fetal outcome
was vigorous in 3 late decelerations, but ominous when it repeated. It was thought
that FHR decelerations expresses hypoxia, because the heart rate was fully
parallel to rabbit PaO2, if it is below 50mmHg, and human fetal PaO2 is 50mmHg
or less. Thus, a hypoxia index (HI), that is hypoxic nature, was sum of
deceleration duration (min) divided by the lowest nadir FHR (bpm), and
multiplied by 100. Its calculation is easy by computer, though possible by
manual calculation. HI has regression equation with Apgar score, and Apgar score
was high in 2 to 3 late decelerations (LD), while HI was high and Apgar score
was low in repeared LDs, solving the LD discrepancy. Although no particular
role is expected by LD pattern, hypoxic effect is estimated in repeated large decelerations
and deep bradycardia, namely, numerical analysis is possible in the deceleration
and continuous bradycardia.
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Published on: Mar 13, 2018 Pages: 5-5
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DOI: 10.17352/jgro.000048
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