Asymmetric dimethylarginine levels and diabetes duration: Relationship with measures of subclinical atherosclerosis and cardiac function in children and adolescents with Type 1 diabetes
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Aims: We aimed to evaluate asymmetric dimethylarginine levels in young patients with Type 1 diabetes mellitus according to diabetes duration and to examine the relationship between these levels and measures of atherosclerosis and myocardial function. Materials and methods: In total, 83 patients (8.5-22years) with Type 1 diabetes mellitus were stratified by diabetes duration: 12-60months (Group 1, n=27), >60-120months (Group 2, n=29) and >120months (Group 3, n=27). Asymmetric dimethylarginine levels were assessed. Carotid intima-media thickness was measured. Myocardial function was assessed by M-mode, conventional Doppler and tissue Doppler echocardiography. Results: Asymmetric dimethylarginine level was significantly higher in Group 1, while carotid intima-media thickness was significantly greater in Group 3 (p<0.05). Tissue Doppler echocardiography showed the ratio of peak early to peak late diastolic myocardial annular velocity decreased significantly in Groups 2 and 3 with a negative correlation with duration (r: -0.310, p=0.004) and HBA1c levels (r=-0.391, p<0.001). Myocardial performance index in all groups and isovolumic relaxation time in Group 3 increased significantly. Asymmetric dimethylarginine levels were negatively correlated with carotid intima-media thickness and isovolumic relaxation time (p<0.05). Conclusion: In contrast to adult diabetics, asymmetric dimethylarginine concentration decreases as diabetes duration increases in young Type 1 diabetic patients and is associated with worsening measures of cardiovascular risk and poorer diastolic function.