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Correlations of LVEF and LVFS with ΔSS in children and adolescents with POTS. (A) LVEF; (B) LVFS. LVEF: Left ventricular ejection fraction; LVFS: Left ventricular fractional shortening; POTS: Postural tachycardia syndrome; ΔSS: Pre-treatment symptom score minus post-treatment symptom score.
