title: Low potassium level during the first half of pregnancy is associated with lower risk for the development of gestational diabetes mellitus and severe pre-eclampsia.
abstract: OBJECTIVE
  To examine the association between potassium level during the first half of pregnancy and the development of gestational diabetes mellitus (GDM) and hypertensive disorders in the second half of the pregnancy.
  
  
  METHODS
  The study population included all registered births between the years 2001-2007. The potassium levels during the first half of pregnancy were sorted by the following groups: K < 3.5 mEq/l; K = 3.5-3.99 mEq/l; and K > or = 4 mEq/l. The linear by linear chi(2)-test was used to determine the association between potassium level during the beginning of pregnancy and pregnancy complications.
  
  
  RESULTS
  The study population included 8114 deliveries. A significant linear association was documented between potassium level in the first half of the pregnancy and the prevalence of GDM in the second half of the pregnancy: 6.3% in the K < 3.5 mEq/l group, 6.6% in the K = 3.5-3.99 mEq/l group and 8.2% in the K > 4 mEq/l group; (p = 0.008). A statistically significant for lower rates of severe pre-eclampsia was noted between the groups: 0.4% in the K < 3.5 mEq/l group, 0.9% in the K = 3.5-3.99 mEq/l group, 1.3% in the K = 4.0-4.99 mEq/l group and 1.5% in the K > or = 5 mEq/l group, (p = 0.027). Indeed, K > 5 mEq/l was noted as a significant risk factor for both, severe pre-eclampsia and for GDM. Using two multiple logistic regression models controlling for maternal age, potassium level was noted as an independent risk factor for both GDM and severe pre-eclampsia.
  
  
  CONCLUSIONS
  High potassium levels during the first half of pregnancy are associated with higher risk for the development of GDM and severe pre-eclampsia.
authors.affiliation: The Hypertension Unit, Soroka University Medical Center, Be'er-Sheva, Israel. twolak@bgu.ac.il
authors.forename: Talya
authors.initials: T
authors.lastname: Wolak
authors.forename: Ruslan
authors.initials: R
authors.lastname: Sergienko
authors.forename: Arnon
authors.initials: A
authors.lastname: Wiznitzer
authors.forename: Lior
authors.initials: L
authors.lastname: Ben Shlush
authors.forename: Esther
authors.initials: E
authors.lastname: Paran
authors.forename: Eyal
authors.initials: E
authors.lastname: Sheiner
mesh_terms: D000328:Adult; D016640:Diabetes, Gestational / Q000097:blood / Q000453:epidemiology / Q000209:etiology*; D005260:Female; D005865:Gestational Age; D006801:Humans; D006973:Hypertension / Q000097:blood / Q000453:epidemiology; D011188:Potassium / Q000097:blood*; D011225:Pre-Eclampsia / Q000097:blood / Q000453:epidemiology / Q000209:etiology*; D011247:Pregnancy; D011261:Pregnancy Trimester, First / Q000097:blood*; D011262:Pregnancy Trimester, Second / Q000097:blood; D015995:Prevalence; D012189:Retrospective Studies; D012307:Risk Factors; D012720:Severity of Illness Index; D055815:Young Adult
chemical_list: D011188:Potassium