The association between ketoacidosis and 25(OH)-vitamin D levels at presentation in children with type 1 diabetes mellitus.
BACKGROUND
There is considerable evidence supporting the role of vitamin D deficiency in the pathogenesis of type 1 diabetes mellitus (T1DM). Vitamin D deficiency is also associated with impairment of insulin synthesis and secretion. There have been no formal studies looking at the relationship between 25(OH)-vitamin D(3) and the severity of diabetic ketoacidosis (DKA) in children at presentation with T1DM.


OBJECTIVE
To determine the relationship between measured 25(OH)-vitamin D(3) levels and the degree of acidosis in children at diagnosis with T1DM.


METHODS
Children presenting with new-onset T1DM at a tertiary children's hospital.


METHODS
25(OH)-vitamin D(3) and bicarbonate levels were measured in children at presentation with newly diagnosed T1DM. Those with suboptimal 25(OH)-vitamin D(3) levels (<50 nmol/L) had repeat measurements performed without interim vitamin D supplementation.


RESULTS
Fourteen of the 64 children had low 25(OH)-vitamin D(3) levels at presentation, and 12 of these had low bicarbonate levels (<18 mmol/L) (p = 0.001). Bicarbonate explained 20% of the variation in vitamin D level at presentation (partial r(2) = 0.20, p < 0.001) and ethnic background a further 10% (partial r(2) = 0.10, p = 0.002). The levels of 25(OH)-vitamin D(3) increased in 10 of the 11 children with resolution of the acidosis.


CONCLUSIONS
Acid-base status should be considered when interpreting 25(OH)-vitamin D(3) levels in patients with recently diagnosed T1DM. Acidosis may alter vitamin D metabolism, or alternatively, low vitamin D may contribute to a child's risk of presenting with DKA.
Huynh
Tony
T
Department of Paediatric Endocrinology and Diabetes, Mater Children's Hospital, Brisbane, QLD, Australia. tony.huynh@mater.org.au
Greer
Ristan M
RM
Nyunt
Ohn
O
Bowling
Francis
F
Cowley
David
D
Leong
Gary M
GM
Cotterill
Andrew M
AM
Harris
Mark
M