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QT Parameters before and after the Head Up Tilt Test
Values are the mean ± SD or numbers. QTI: QT interval, HUT: head-up tilt, QTc: corrected QT interval using Bazett's formula, abnormal QTc: QTc ≥ 450 ms, QTVI: QT variability index. *P < 0.05 vs. supine position, †P < 0.05 vs. control subjects, ‡P < 0.05 vs. Child class A patients.
