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

Table 3 Heart rate and QT interval before and after reperfusion, group I vs group II

Parameter	Group I, n = 120 patients			Group II, n = 120 patients			P value
	Before	After	∆	Before	After	∆	P1	P2	P3	P4	P5
Heart rate in beat/min	81.0 ± 15.7	82.7 ± 16.4	-1.7 ± 18.9	76.2 ± 16.3	78.2 ± 14.8	-2.0 ± 14.9	0.34	0.14	0.02	0.02	0.87
Maximum QT in msec	411.7 ± 38.4	392.0 ± 44.1	19.7 ± 48.8	402.6 ± 46.9	405.3 ± 45.6	-2.8 ± 44.3	< 0.001	0.49	0.10	0.02	< 0.001
Minimum QT in msec	320.2 ± 34.6	338.1 ± 39.0	- 17.9 ± 34.4	330.6 ± 47.4	344.6 ± 48.0	-14.0 ± 41.3	< 0.001	0.001	0.06	0.25	0.48
QTD in msec	91.5 ± 20.6	53.9 ± 19.1	37.6 ± 17.1	72.0 ± 18.5	60.7 ± 18.1	11.3 ± 7.9	< 0.001	< 0.001	< 0.001	0.005	< 0.001
Maximum QTc in msec	474.3 ± 45.9	453.8 ± 38.1	20.6 ± 53.1	448.1 ± 34.1	458.4 ± 39.7	-10.4 ± 35.8	< 0.001	0.002	< 0.001	0.35	< 0.001
Minimum QTc in msec	369.9 ± 43.2	393.0 ± 32.1	- 23.1 ± 51.7	367.1 ± 31.1	388.9 ± 40.3	-21.8 ± 36.2	< 0.001	< 0.001	0.56	0.38	0.82
QTcD in msec	104.4 ± 22.1	60.8 ± 21.6	43.6 ± 13.6	80.9 ± 24.4	69.6 ± 22.8	11.4 ± 8.0	< 0.001	< 0.001	< 0.001	0.003	< 0.001

Data are expressed in form of mean ± SD. P1: P value comparing before and after PPCI in group I. P2: P value comparing before and after thrombolytic therapy in group II. P3: P value comparing group I and group II before reperfusion strategy. P4: P value comparing group I and group II after reperfusion strategy. P5: P value comparing group I and group II regarding delta change. QTc: Corrected QT; QTD: QT dispersion; QTcD: Corrected QT dispersion; ∆: Change in variables before and 24 hr after reperfusion; SD: Standard deviation.