Relationships Between Heart Rate Variability In The Early And Stable Stage And Heart Function After Acute Myocardial Infarction

Objective: 1 .To assess the quantity relationships of heart rate variability(HRV),CPK and CK-MB with heart function in patients after acutemyocardial infarction (AMI) . 2. To investigate the change of heart ratevariability (HRV) between in the early and stable stage after AMI. 3. To find theinfluence of myocardial infarction location, scopes and complication on HRV.Methods: 30 patients with AMI in 24 hours were selected, were taken blood to analyze the myocardial enzyme every 2 hours in 24 hours (They were taken blood from the 6 hour if taken bad before the 6 hour, They were taken blood from coming in hospital if taken bad after the 6 hour) for its peak values. With dynamic state electrocardiogram check, each index sign of HRV: SDNN( standard error of normal-to-normal intervals ), SDANN(standard error of normal-to-normal interval average), RMSSD(The root mean square of successive differences), PNN50(the percentage of R-R intervals that differed by >50ms), LF( the low frequency power), HF( the high frequency power ), LF/ HF were measured in 48 hours after AMI and 2 weeks. Using echocardiograph measured the LVEF on 2 weeks, and the echocardiograph and the dynamic state electrocardiogram checks carry on synchronously. Record the electrocardiogram myocardial infarction locations and scopes.Result:(l) Each index sign of HRV of the patients after AMI in stable presented obvious positive correlation with LVEF; the R(relative coefficient) of SDNN,SDANN, PNN50 , RMSSD, LF, HF was 0.77,0.80, 0.56, 0.56,0.66,0.59 respectively (p<0.05); The degree of recovery of SDNN, SDANN, LF presented obvious positive correlation with LVEF, the R of SDNN,...