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  11. The Incidence, Characteristics, Management And Outcomes Of Peripartum Hyponatraemia In The United Kingdom: A Prospective Study Using The Uk Obstetric Surveillance System (ukoss)

The Incidence, Characteristics, Management and Outcomes of Peripartum Hyponatraemia in the United Kingdom: A Prospective Study Using the UK Obstetric Surveillance System (UKOSS)

Arani Pillai1, Laila J Tata2, Nuala Lucas3

  • 1Department of Anaesthesia, Nottingham University Hospitals NHS Trust, Nottingham, UK.

BJOG : an International Journal of Obstetrics and Gynaecology
|June 13, 2025

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View abstract on PubMed

Summary
This summary is machine-generated.

Peripartum hyponatraemia, a condition affecting pregnant individuals, is linked to maternal health issues. Even without clear symptoms, it can lead to significant neonatal complications and increased rates of operative birth.

Area of Science:

  • Obstetrics and Gynecology
  • Maternal-Fetal Medicine
  • Endocrinology

Background:

  • Peripartum hyponatraemia is a rare but potentially serious condition during pregnancy and childbirth.
  • Understanding its incidence and impact is crucial for optimizing maternal and neonatal care.

Purpose of the Study:

  • To determine the national incidence, characteristics, management, and outcomes of peripartum hyponatraemia in the UK.
  • To compare outcomes between cases with and without documented maternal symptoms.

Main Methods:

  • A prospective, observational study using the UK Obstetric Surveillance System (UKOSS) methodology.
  • Data collected from 192 UK National Health Service consultant-led obstetric units between April 2019 and September 2020.
  • Case definition: symptomatic hyponatraemia (sodium < 125 mmol/L) in labour or within 48 hours postpartum, excluding other causes.
Keywords:
UKOSShyponatraemiasodium

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Main Results:

  • An estimated incidence of 3.0 cases of symptomatic peripartum hyponatraemia per 100,000 maternities was found.
  • Cases with documented symptoms showed higher rates of critical care admission (53%) compared to those without (24%).
  • Neonatal unit admissions and operative birth rates were also notable, even in cases without documented maternal symptoms.

Conclusions:

  • Peripartum hyponatraemia is associated with significant maternal morbidity.
  • Neonatal morbidity and operative birth rates are high, irrespective of documented maternal symptoms.
  • The true incidence may be underestimated due to poor recognition and documentation of symptoms.