The Association between Myocardial Iron Load and Ventricular Repolarization Parameters in Asymptomatic Beta-Thalassemia Patients

Table 2

Electrocardiographic parameters of the β-TM group and controls.

	Controls (𝑛=22)	β-TM (𝑛=22)	P value
QT (ms)	348±26	374±25	0.002
QTd (ms)	40±10	40±16	0.87
QTp (ms)	265±27	285±22	0.009
(QTp)d (ms)	32±15	31±9.0	0.77
QTc (ms)	396±32	445±26	<0.001
cQTd (ms)	46±12	48±18	0.74
𝑇𝑝−𝑇𝑒 (ms)	79±12	89±15	0.02
(𝑇𝑝−𝑇𝑒)𝑑 (ms)	39±11	48±17	0.03
(𝑇𝑝−𝑇𝑒)/QT	0.22±0.03	0.23±0.03	0.32
QRS duration (ms)	88±14	93±12	0.28
Heart rate (bpm)	78±7	85±8	0.004

β-TM: β-thalassemia major; QTd: QT dispersion; QTp: peak QT; (QTp)d: peak QT dispersion; QTc: corrected QT; cQTd: corrected QT dispersion; 𝑇_𝑝−𝑇_𝑒: difference between T-peak and T-end; (𝑇_𝑝−𝑇_𝑒)d: 𝑇_𝑝−𝑇_𝑒 dispersion.