Abstract：Objective To investigate the value of heart rate deceleration capacity (DC), heart rate deceleration runs (DRs) and heart rate variability (HRV) indexes in the auxiliary diagnosis of silent myocardial ischemia (SMI). Methods A total of 65 SMI patients who had been admitted and treated in our hospital were selected as the observation group while 65 healthy controls during the same period were enrolled as the control group. Both groups were monitored by 24hour ambulatory electrocardiography. The values of DC, DRs and HRV indexes of the two groups were compared, and the correlation among these indexes were analyzed. Results The values of DC, DR4, DR8, SDANN, rMSSD and pNN50 in the observation group are lower than those in the control group (P<0.05) . There is significant positive correlation between DC, DR2, DR4, DR8, and SDNN, SDANN, rMSSD, pNN50 in the observation group (P<0.05). Conclusion Compared with healthy people, the levels of DC, DRs and HRV among SMI patients are significantly lower; DC and DRs values are significantly positively correlated with HRV values. Testing of DC, DRs and HRV indexes can be applied as an auxiliary method for screening SMI patients.
