Melatonin reduces tachycardia in postural tachycardia syndrome: a randomized, crossover trial.
Green EA, Black BK, Biaggioni I, Paranjape SY, Bagai K, Shibao C, Okoye MC, Dupont WD, Robertson D, Raj SR. Melatonin reduces tachycardia in postural tachycardia syndrome: a randomized, crossover trial. Cardiovasc Ther. 2014 Jun; 32(3):105-12.