A system of Heart Rate Variability (aHRV, SAaHRV) analysis giving a noninvasive estimate of the function of the sympathetic and parasympathetic autonomic nervous systems in patients and fulfilling the requirements of the Heart Rate Variability Standards*. The maximum allowed recording length is 120 hrs (5 days). It consists of two software modules:
Nevrokard™ SAaHRV is a software package for Heart Rate Analysis in small animals. It features frequency domain analysis of up to 5Hz and a resampling rate of 10Hz. It is intended for use in animals having a considerably higher heart rate than human subjects. The complementary File Preparation software for small animals is Nevrokard™ SAaHRV FP software. The maximum allowed recording length for SAaHRV Analysis is 26 hrs. 
An ECG file recorded by any acquisition system or a RR interval file is required. The software is compatible with ECG and RRI files in several different formats (see Data Formats). 
Detection of R waves, calculation of RR intervals, editing of the ECG record. 
Premature heart beats can be edited out of RRI files manually... 
... or automatically. The number of preceding beats on which correction is based, the parameters defining abnormal beats and the method of correction (deletion, interpolation) can be selected. 
TIME DOMAIN ANALYSIS  
All timedomain displays and calculations will be done either in the RR or HR mode.  
Statistics: Max., Min., Max./Min., Range, Mean NN, Mean dNN (MSD), Median, 95% Conf. Interval, 99% Conf. Interval, lnHRV, Coef. of Variance, Variance, SDNN, SENN, SDSD, RMSSD, NN50 Count, pNN50, SDANN, SDNN Index, SDASD. 

Segmented statistics: SDANN, SDNN 

Histogram: Mean, SD, Median, Modus, Dispersion, Upper F(X), Uncertainty, Skeweness, Kurtosis and Variability Index (HRV Triangular Index with a freely adjustable Class Interval (bin value)). 

Poincare Analysis: SD1, SD2 in both absolute and normalized units, SD1/SD2 Ratio, CSI (Cardiac Sympathetic Index), CVI (Cardiac Vagal Index), dRRt, dRRr in both absolute and normalized units, dRRt/dRRr, Centroid, Ellipse Area, R^{2} and SEE. 
FREQUENCY DOMAIN ANALYSIS 







RESULTS OF ANALYSIS 

Chart Editor is available for all modes of analysis. 
The Export Results utility enables the operator to save the selected analysis results to an Excel (CSV) spreadsheet. The results are saved in groups and automatically and sequentially appended to (a) selected Excel Results file(s). 

** For more information about the CZF Analysis click here or visit a websites www.saistmp.com and http://www.societyforchaostheory.org/tutorials. 
