Objective: To ascertain whether initial depression of conscious level in children with diabetic ketoacidosis (DKA) is related to hyperosmolality, acidosis or other factors.

Methods: In 225 episodes of DKA without evidence of cerebral edema, we examined the relationship between conscious level and initial biochemical variables. We contrasted these findings with those in 42 children who later developed cerebral oedema.

Results: On admission, 42/225 (19%) had mild (pH 7.26-7.35); 96 (44%) moderate (pH 7.11-7.25); and 80 (37%) severe DKA (pH
Conclusions: In children with DKA, initial conscious level is closely related to pH and weakly to age, but not to BG or plasma sodium level. Thus cerebral function in DKA is related to severity of acidosis even when there is no evidence of cerebral edema.

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