Association Between Severity of Diabetic Ketoacidosis at Diagnosis and Multiple Autoimmunity in Children With Type 1 Diabetes Mellitus: A Study From a Greek Tertiary Centre

Predictors of associated and multiple autoimmunity in children and adolescents with type 1 diabetes mellitus

PURPOSE

Type 1 diabetes mellitus (T1DM) is an autoimmune condition characterised by the presence of antipancreatic antibodies. The autoimmune process is also directed against other organs, most frequently against the thyroid gland, intestinal mucosa, and gastric parietal cells.

METHODS

Our investigation included 121 children with T1DM with a mean age±standard deviation of 11.99±4.63 years (range, 2.0-20.0 years). We explored the frequency of associated autoimmunity; the presence of predictive factors such as current age, sex, and severity at diabetes diagnosis; T1DM duration; and family history of autoimmunity.

RESULTS

Associated autoimmunity was present in 28.9% of T1DM patients. Children with associated autoimmunity were older at diabetes diagnosis (p=0.009) and had a longer diabetes duration compared to children without associated autoimmunity (p=0.044). Adolescents aged 12-20 years had a statistically significant higher chance of developing thyroid autoimmunity compared to children aged 1-5 years (p=0.019). Multiple autoimmunity (MA), T1DM, and 2 or more autoimmune diseases were present in 5.8% of the study population. All children with MA presented with ketoacidosis at diabetes diagnosis and had a higher percentage of familial autoimmunity (p=0.042). The familial autoimmunity of these patients most frequently affected ≥3 relatives (p=0.026) and was more frequently diagnosed before 5 years of age (p=not significant).

CONCLUSION

Associated autoimmunity was present in almost one-third of T1DM patients. Significant associations with associated autoimmunity were longer diabetes duration, female sex, older age at diabetes diagnosis, and glutamic acid decarboxylase positivity. Predictors of MA were age <5 years at T1DM diagnosis, the presence of diabetic ketoacidosis at diagnosis, and a significant family history of autoimmunity.

Familial autoimmunity in pediatric patients with type 1 diabetes (T1D) and its associations with the severity of clinical presentation at diabetes diagnosis and with coexisting autoimmunity

PURPOSE

The aim was to evaluate the impact of familial autoimmunity on the age and severity of type 1 diabetes (T1D) presentation and on the coexistence of other autoimmune diseases.

METHODS

We retrospectively evaluated the medical records of 121 children/adolescents (male: 63) followed in our Diabetic Clinic from 2002 to 2016.

RESULTS

Seventy-six patients (62.8%) had at least one relative with an autoimmune disease, Hashimoto's thyroiditis (49.5%) and T1D (22.3%) being the commonest. Children with familial autoimmunity were younger at T1D diagnosis (mean age ± SD) (6.766 ± 3.75). Median fasting c-peptide levels at presentation were not related to familial autoimmunity. Patients with familial autoimmunity more often exhibited GADA autoantibody positivity at diagnosis. The larger the number of the patient's relatives diagnosed with an autoimmune disease, the higher were the patient's GADA levels (Spearman's rho test = 0.19, p = 0.049). Children with a first-degree relative with autoimmunity had a coexisting autoimmune disorder at a significantly higher percentage (p = 0.016). Family history of autoimmunity was negatively associated with the presence of diabetic ketoacidosis (DKA) (p = 0.024). Patients with a relative with T1D less frequently exhibited DKA at diagnosis (12.8 vs. 87.2%, p = 0.003). The presence of DKA was associated with younger age (p = 0.05) and lower c-peptide levels (p = 0.033).

CONCLUSIONS

Familial autoimmunity was present in 62.8% of children with T1D, autoimmune thyroiditis and T1D being the two most frequent familial autoimmune diseases. Familial autoimmunity reduced the risk of DKA at diagnosis, but these patients were younger and had higher levels of pancreatic autoantibodies and a greater risk of developing additional autoimmune diseases.