Effect of reperfusion strategy on QT dispersion in patients with acute myocardial infarction: Impact on in-hospital arrhythmia

Table 4 QT and corrected QT dispersion before and after reperfusion in patients with or without in-hospital arrhythmia

Parameter	In-hospital arrhythmia group, n = 33 patients			No in-hospital arrhythmia group, n = 207 patients			P value
	Before	After	∆	Before	After	∆	P1	P2	P3	P4	P5
QTD in msec	82.1 ± 19.3	67.3 ± 22.7	14.8 ± 18.9	81.7 ± 22.3	55.8 ± 17.7	25.9 ± 18.3	< 0.001	< 0.001	0.91	0.001	0.003
QTcD in msec	94.0 ± 25.3	74.2 ± 24.9	19.8 ± 14.5	92.5 ± 26.2	63.7 ± 21.9	28.7 ± 20.1	< 0.001	< 0.001	0.75	0.03	0.02

Data are expressed in form of mean ± SD. P1: P value comparing before and after reperfusion strategy in in-hospital arrhythmia group. P2: P value comparing before and after reperfusion strategy in no in-hospital arrhythmia group. P3: P value comparing in-hospital arrhythmia group and no in-hospital arrhythmia group before reperfusion strategy. P4: P value comparing in-hospital arrhythmia group and no in-hospital arrhythmia group after reperfusion strategy. P5: P value comparing in-hospital arrhythmia group and no in-hospital arrhythmia group regarding delta change. QTD: QT dispersion; QTcD: Corrected QT dispersion; ∆: Change in variables before and 24 hr after reperfusion; SD: Standard deviation.