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Metabolic control in children with insulin dependent diabetes mellitus assessed by hemoglobin A1c
Insights
Hemoglobin A1c monitoring in children with insulin-dependent diabetes mellitus revealed seasonal variations and a link to growth. Improved metabolic control was observed during summer months, highlighting the importance of frequent testing for managing diabetes in children.
Area of Science:
- Pediatrics
- Endocrinology
- Clinical Chemistry
Background:
- Insulin-dependent diabetes mellitus (IDDM) requires careful metabolic control in children.
- Glycosylated hemoglobin (hemoglobin A1c) is a key marker for long-term glucose regulation.
Purpose of the Study:
- To assess the utility of hemoglobin A1c in monitoring metabolic control in pediatric IDDM patients.
- To investigate correlations between hemoglobin A1c, clinical control, growth, and seasonal factors.
Main Methods:
- Hemoglobin A1c levels were measured using iso-electric focusing in 92 children with IDDM over 18 months.
- Metabolic control was assessed clinically and correlated with hemoglobin A1c levels and growth parameters.
Main Results:
- A significant correlation was found between hemoglobin A1c and clinical metabolic control.
- Lower hemoglobin A1c levels were observed during summer (June-July), indicating improved control.
- Poorly controlled diabetic children (hemoglobin A1c > 12.5%) showed improved carbohydrate tolerance and lower hemoglobin A1c by study end.
- Retarded linear growth correlated directly with poorer metabolic control (higher hemoglobin A1c).
Conclusions:
- Hemoglobin A1c is valuable for routine management of pediatric IDDM, especially in cases of poor control.
- Frequent hemoglobin A1c monitoring is essential due to rapid glucose profile variations in these patients.
- Seasonal variations in hemoglobin A1c suggest environmental influences on metabolic control in diabetic children.
Abstract:
The glycosylated hemoglobin component, hemoglobin A1c, was estimated in 92 children with insulin dependent diabetes mellitus by an iso-electric focusing procedure during an observation period of 18 months. A significant correlation between hemoglobin A1c and the actual metabolic control according to clinical ratings was found. A seasonal variation in the concentration of the hemoglobin A1c was observed with the lowest level in the months of June and July consistent with an improved metabolic control in the diabetic children during the summer period. A direct relationship was found between metabolic control as assessed by hemoglobin A1c and retarded linear growth expressed as standard deviation score for height. Children with poorly controlled diabetes (initial hemoglobin A1c level above 12.5%) improved their carbohydrate tolerance shown by a significantly lower glycohemoglobin level at the end of the observation period. Consequently, hemoglobin A1c is particularly useful in the routine management of insulin dependent diabetic children in poor metabolic control. Frequent determinations are necessary since in these patients the glucose profiles are prone to great variations, which may lead to changes in the hemoglobin A1c concentration of about 1% in a week.
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