An electrocardiogram (ECG) is commonly used in clinical applications to help doctors diagnose cardiac diseases such as tachycardia. Aside from directly analyzing an ECG, researchers and doctors also extract other indirect measurements from ECG signals. One of the most popular measurements is heart rate variability (HRV). HRV measurements analyze how RR intervals, which show the variation between consecutive heartbeats, change over time.
A normal one-cycle ECG signal is made up of several waves.
The peak with the highest amplitude is called the R wave. An RR interval is the time that elapses between two successive R waves. The lower peaks are the P wave, the T wave, and the U wave, respectively.
The HRV Analyzer is an application for extracting measurements from RR interval signals. This application includes the following features:
Complete the following steps to import an RR interval signal to the HRV Analyzer.
(For Text RR file) Click Import Settings and choose the file you want to import (only .txt file supported), and click OK.
(For ECG file with annotations) Click Import Settings to display the File Settings dialog, click Browse button next to the File Path. Select file you want to import (only files generated by ECG Feature Extractor supported) and click OK. If the ECG signal contains multiple analysis results, select one from Annotation/comment list. Finally, click OK to close the dialog.
(For ECG Feature Extractor) Click Start, and wait until all RR intervals have been imported, then click Stop.
The HRV Analyzer supports preprocessing techniques, such as detrending and thresholding.
Complete the following steps to preprocess the RR interval signal you imported.
The HRV Analyzer supports the following signal analysis methods:
In the Signal Analysis section, select the signal analysis method you want to apply to the RR interval signal. If the method you select requires you to configure settings, click the Analysis Settings button to display the configuration dialog box of that method.
Note: The Analysis Settings button is available only when the method you select contains settings that you can configure.
The HRV Analyzer can export analysis results to HTML file. You can also print a report directly. Complete the following steps to generate a report:
Following is an example of the generated report (only first page displayed):