Restoration of Vitamin D Levels Improves Endothelial Function and Increases TASK-Like K⁺ Currents in Pulmonary Arterial Hypertension Associated with Vitamin D Deficiency.

This study showed clear benefits of vitD on right ventricular size and 6MWD and a borderline significant effect on echocardiographycally estimated mPAP, but because this was a small and uncontrolled study with no placebo arm, the results are not conclusive.

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