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Hyponatremia complicating labour--rare or unrecognised? A prospective observational study
1Department of Anaesthesiology and Intensive Care, County Hospital, Kalmar, Sweden. vibekem@ltkalmar.se
BJOG : an International Journal of Obstetrics and Gynaecology
|January 30, 2009
Summary
Hyponatraemia, or low sodium, is common after labor, especially with high fluid intake. Women should limit fluids during labor to prevent this potentially dangerous condition.
Area of Science:
- Obstetrics and Gynecology
- Maternal-Fetal Medicine
- Clinical Chemistry
Background:
- Hyponatraemia (low plasma sodium) can occur postpartum.
- Fluid intake during labor is common, but its effect on maternal sodium levels is not fully understood.
Purpose of the Study:
- To investigate the prevalence of hyponatraemia in women following delivery.
- To identify risk factors associated with postpartum hyponatraemia.
Main Methods:
- Prospective observational study of 287 women at term.
- Fluid intake (oral and intravenous) and plasma sodium levels were monitored.
- Hyponatraemia defined as plasma sodium <= 130 mmol/l post-delivery.
Main Results:
- Hyponatraemia occurred in 26% of women receiving >2500 ml fluid during labor.
- Increased fluid volume and labor duration correlated with decreased plasma sodium.
- Hyponatraemia was linked to prolonged labor, instrumental delivery, and emergency C-section.
Conclusions:
- Postpartum hyponatraemia is not uncommon, linked to increased fluid intake during labor.
- Reduced tolerance to water load during labor can precipitate hyponatraemia.
- Recommendations include monitoring oral fluid intake and avoiding hypotonic intravenous fluids.
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