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Heart rate variability was analyzed in time domains (standard deviation of all normal-to-normal intervals [SDNN], normal-to-normal RR intervals in all 5-minute segments [SDANN], and root mean square successive difference [RMSSD]). The DC, SDNN, SDANN, RMSSD, and heart rate decreased with age. Deceleration capacity was significantly lower in patients greater than 50 years of age. The largest decrease of SDNN, SDANN, and RMSSD occurred in patients 30�C39 years of age. The values of SDNN, SDANN, and DC of women were lower than that of men in the young and middle-aged groups, but age-related decrease of DC in men was greater than that in women. Heart rate of women was significantly higher than that of men in younger subjects, especially in a sleeping mode. There were higher values of DC and RMSSD during sleeping than that during a waking state. The age, gender, and circadian rhythm may be useful when evaluating cardiac autonomic http://www.selleckchem.com/products/avelestat-azd9668.html function http://www.selleckchem.com/products/a-1331852.html and need to be considered when evaluating DC and HRV in clinical and scientific researches. ""Contemporary electrocardiographic (ECG) markers including ventricular ectopy and arrhythmias have not proved reliable in risk assessment for life-threatening arrhythmias. We developed the ��Multilead ECG Template-Derived Residua�� approach to remove intrinsic morphologic differences and allow calculation of pathologic ECG heterogeneities among spatially separated leads. Prediction by R-wave and T-wave heterogeneity (RWH, TWH) analysis was tested in simulated and clinical ECGs. An enabling description of the Residua algorithm is provided. Simulated ECGs with but not without Residua produced a linear relationship (correlation http://www.selleck.cn/products/PLX-4720.html coefficient r2 = 0.999) between input and output RWH and TWH values. In heart failure patients, Residua disclosed a marked crescendo in RWH from 164.1 �� 33.1 at baseline to 299.8 �� 54.5 ��V and TWH from 134.5 �� 20.6 at baseline to 239.2 �� 37.0 ��V at 30�C45 minutes before the arrhythmia (both, P