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Absent maternofetal potassium gradient at term.

T Mohammed1, M Maresh, C P Sibley

  • 1Department of Child Health, St Mary's Hospital, Manchester.

Archives of Disease in Childhood
|April 1, 1990
PubMed
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This study found that umbilical venous plasma potassium levels significantly increase after maternal laparotomy during term pregnancy. Maternal potassium levels remained stable, indicating a potential fetal response to surgical stress.

Area of Science:

  • Obstetrics and Gynecology
  • Anesthesiology
  • Perinatal Medicine

Background:

  • Maternal surgery during pregnancy can impact fetal physiology.
  • Potassium homeostasis is critical for both maternal and fetal well-being.
  • Limited data exists on fetal potassium response to intraoperative surgical stress.

Purpose of the Study:

  • To investigate changes in umbilical venous plasma potassium concentrations following maternal laparotomy at term.
  • To compare fetal potassium levels with maternal peripheral venous plasma potassium concentrations.
  • To assess the impact of laparotomy on fetal plasma calcium levels.

Main Methods:

  • Umbilical venous blood samples were collected at multiple time points (5.5, 10, 20, 30 minutes) after the start of laparotomy.

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  • Maternal peripheral venous blood samples were collected before and after laparotomy.
  • Plasma potassium and calcium concentrations were measured in all samples.

    • Main Results:

    • Umbilical venous plasma potassium concentrations increased significantly over time after laparotomy, rising from 4.75 mmol/kg at 5.5 minutes to 7.59 mmol/kg at 30 minutes.
    • Maternal peripheral venous plasma potassium concentrations showed no significant change (4.30 mmol/kg pre-op, 4.26 mmol/kg post-op).
    • Maternal and cord blood plasma calcium concentrations remained stable throughout the study period.

    Conclusions:

    • Maternal laparotomy at term is associated with a progressive increase in fetal plasma potassium levels.
    • The observed fetal hyperkalemia suggests a potential stress response or altered placental transfer.
    • Plasma calcium levels appear unaffected by maternal laparotomy in the term fetus.