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Thyroid function in children with newly diagnosed type 1 diabetes mellitus
Chao-Hsu Lin1, Yann-Jinn Lee, Chi-Yu Huang
1Department of Pediatrics, Mackay Memorial Hospital, No. 92, Sec. 2, Chung-Shan North Road, Taipei 10449, Taiwan.
Insights
Diabetic ketoacidosis (DKA) in children with type 1 diabetes significantly alters thyroid function tests. These thyroid abnormalities are reversible with good diabetic control, suggesting selective thyroid testing at diagnosis.
Area of Science:
- Pediatric Endocrinology
- Diabetology
- Thyroidology
Background:
- Type 1 diabetes diagnosis in children can be complicated by diabetic ketoacidosis (DKA).
- Thyroid dysfunction is common in patients with diabetes mellitus.
- The impact of DKA on thyroid hormone indices in pediatric type 1 diabetes requires clarification.
Purpose of the Study:
- To evaluate thyroid hormone indices in children with newly diagnosed type 1 diabetes, comparing those with and without DKA to healthy siblings.
- To determine if DKA influences thyroid function tests and if these changes are reversible.
Main Methods:
- Thyroid function tests (T3, T4, free T4, FTI, TSH) were measured in 138 children with new-onset type 1 diabetes (76 with DKA, 62 without DKA) and 35 healthy siblings.
- Measurements were taken within 3 days of diagnosis and during follow-up (1 month to 2 years) after diabetes treatment.
Main Results:
- Children with DKA showed significantly lower levels of T3, T4, free T4, and FTI compared to non-DKA and control groups.
- Children without DKA had lower T3 levels than controls, but T4, free T4, and FTI did not differ significantly.
- Thyroid-stimulating hormone (TSH) levels were similar across all three groups.
Conclusions:
- Diabetic ketoacidosis significantly alters thyroid function measurements in children with type 1 diabetes.
- Abnormal thyroid function tests associated with DKA are reversible with improved glycemic control, in the absence of underlying thyroid disease.
- Thyroid function testing at initial diagnosis of type 1 diabetes should be reserved for patients with suspected thyroid disorders.
Abstract:
Evaluation of thyroid hormone indices was performed in 138 children with newly diagnosed type 1 diabetes, with their siblings serving as controls. The DKA group consisted of 76 children who had diabetic ketoacidosis (DKA) at initial diagnosis. The non-DKA group consisted of 62 children and the control group of 35. The thyroid function tests of the patients were measured within 3 days of the initial diagnosis of diabetes and at least one follow-up test one month to two years after adequate treatment of diabetes. The DKA group had significantly lower levels of T3, T4, free T4 and FTI than did the other two groups (p < 0.0001, p < 0.0001, p < 0.0001, and p < 0.0001, respectively). T3 concentration was lower in non-DKA subjects than in controls (p = 0.0003), but the two groups did not significantly differ in terms of T4, free T4, and FTI. The TSH level did not differ among the three groups. We conclude that DKA changes thyroid function measurements. In the absence of true thyroid disease, abnormal thyroid function tests are reversible after institution of good diabetic control. We suggest that thyroid function tests should be restricted to those patients suspected of having thyroid disorders at the initial diagnosis of type 1 diabetes.
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