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  • Title: Maternal hyperventilation as a possible cause of fetal tachycardia sub partu. A clinical and experimental study.
    Author: Müller G, Huber JC, Salzer H, Reinold E.
    Journal: Gynecol Obstet Invest; 1984; 17(5):270-5. PubMed ID: 6428985.
    Abstract:
    Examination of 28 agitated, hyperventilating patients with fetal tachycardia showed that the mothers were in a hyperventilation-related state of hypocapnia and alkalosis. The mean maternal pCO2 was 17.48 +/- 6.79 mm Hg, the pH 7.54 +/- 0.14, which caused a reflex spasm of the umbilical veins, fetal acidosis and fetal tachycardia. Additional experiments on sheep revealed a similar correlation between maternal hyperventilation, hypocapnia, respiratory alkalosis and fetal tachycardia while the flow volume of the uterus showed no change.
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