Correlation between vitamin D level and left ventricular myocardial function demonstrated by speckle tracking echocardiography among β-thalassemia major children.

Comparison of vitamin D level and echocardiographic parameters before and after intervention The mean Vitamin D level surged from 15.93 ± 3.61 (range, 9–22) ng/ml before intervention to 38.39 ± 3.95 (range, 31–45) ng/ml after intervention, showing a highly significant substantial improvement ( p < 0.001) (Figure 1 ).

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