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Maternal hyperventilation as a possible cause of fetal tachycardia sub partu. A clinical and experimental study
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.
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.