Plasma glucose and alanine concentrations were measured after a 24 hour fast in 46 normal children aged 1 to 8 years, and in 15 children aged 1 to 6 years with documented ketotic hypoglycemia (KH). Mean values (± SD) were significantly lower in KH than in controls: 334 ± 149 vs 509 ± 163 mg/dl (p<0.001) for glucose and 16.9 ± 4.9 vs 12.6 ± 3.6 μM/dl (p<0.005) for alanine. In each group, probit transformation demonstrated a gaussian distribution of both parameters. Additionally plasma alanine values were highly significantly positively correlated with glucose levels in controls (y = 6.41 + 20.70 x, r = 0.690, p<0.001) and in KH (y = 6.44 + 18.43 x, r = 0.753, p<0.005), the regression lines in the two groups being not significantly different in slope or position. These data demonstrate further that fasting values of plasma alanine and glucose are significantly lower in KH children than in normals, and are strongly correlated inside the two groups. The lack of any clearcut difference between the two groups demonstrates that KH appears as a borderline state of glycemic regulation and neoglucogenesis during fast in young children.
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