Objective:To investigate the correlation between heart rate turbulence(HRT)and heart rate variability(HRV)indices

and the impact of mean R-R interval

β-blocker and other factors on HRV and HRT.Methods:76 postinfarction patients were recruited.24-hour

three-lead ambulatory electrocardiography was performed in all subjects for the analysis of HRV(including SDNN

PNN50

RMSSD

HF

LF)and HRT(including TO and TS).And the general clinical data of each case were collected.Results:TS was positively correlated with SDNN(r=0.559

P<0.001)

PNN50(r=0.511

P<0.001)

RMSSD(r=0.515

P<0.001)

HF(r=0.644

P<0.001).TO was inversely correlated with SDNN(r=-0.524

P<0.001)

PNN50(r=-0.511

P<0.001)

LF(r=-0.543

P<0.001)

HF(r=-0.412

P<0.001).Both TO and TS had no correlation with the variables such as the treatment of β-blocker

mean R-R intervals

LVEF

concomitant hypertension

but there was a weak correlation between SDNN and each one of these variables.Conclusions:TS is mainly associated with the cardiac vagal efferent activity.TO may be modulated by both sympathetic and parasympathetic efferent activity.HRT is not influenced by such factors as treatment of β-blocker

mean R-R intervals

LVEF

concomitant hypertension

which may explain the reason why HRT is superior to HRV in predicting high-risk patients of SCD.