PubMed · 90889
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T A Hyde. 1979-10-13. Actual or standard bicarbonate.. https://doi.org/10.1016/s0140-6736(79)92145-7
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In vaginally delivered births (including a few cases where the mothers were under epidural anesthesia), differences between first and second born twins were compared according to presentation at delivery. Of twins with vertex/vertex presentation in 15 primipara cases and in 14 multipara cases, pO2 levels for the second born were significantly lower (both being p < 0.05) than for the first born. Of twins vertex/non-vertex presentation, the second born in 9 primipara cases showed significantly lower pH, pO2 and HCO3 levels (p < 0.05). Also for multipara twins, the second born had significantly lower pH (p < 0.05) and significantly higher pCO2 (p < 0.05) values. Umbilical cord blood gas value findings indicate unfavourable conditions for second born twins.
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