Observational Study
Copyright ©The Author(s) 2015.
World J Cardiol. Jul 26, 2015; 7(7): 423-430
Published online Jul 26, 2015. doi: 10.4330/wjc.v7.i7.423
Table 2 Changes in electrocardiograms intervals, represented as means, standard deviation (in brackets) and P for difference
Admission(ECG A)During MTH(ECG B)After MTH(ECG C)P for difference(A to B)P for difference(B to C)P for difference(A to C)
RR interval (ms)653.8 (174.6)818.1 (222.6)656.9 (114.4)< 0.0005a< 0.0005a0.9
Heart rate (bpm)97.9 (24.9)78.3 (19.8)94.2 (17.4)< 0.0005a< 0.0005a0.3
PR interval (ms)169.2 (42.7)179.3 (37.5)161.2 (37.0) 0.090 0.003a0.2
QRS duration (ms)108.8 (23.2)118.7 (37.9)102.0 (22.9)  0.041a< 0.0005a0.029a
QT interval (ms)353.8 (58.1)448.1 (106.1)374.9 (72.0)< 0.0005a< 0.0005a0.042a
QTc interval (ms)441.7 (50.7)499.2 (95.5)463.9 (76.4)< 0.0005a 0.017a0.046a