Respiratory sinus arrhythmia

Respiratory Sinus Arrhythmia

1. From the AcqKnowledge home screen select: Open a graph file, Graph file on Disk, and click OK

   1. This will allow you to access files directly from the T: Drive

2. Minimize all channels except Channels 2 & 9 that correspond to Respiration & ECG respectively, by clicking on the triangle icon on the left hand slide of the channel number.

3. Autoscale waveform horizontally using the autoscale feature in the toolbar

4. The Analysis will identify the R-R interval values in the ECG channel & create a new channel for that waveform. Then it will identify the inspiration & expiration results before conducting the RSA analysis for the Respiration channel

5. Go to Analysis → HRV and RSA → and select "RSA - Time Series " from the options menu

6. 
   From the Respiratory Sinus Arrhythmia dialogue menu, set the following settings:
   

   1. Click OK

   2. * Consider generating logarithmic RSA for additional analysis

7. Autoscale waveform horizontally using the autoscale feature in the toolbar

8. 
   Acq will generate the following results:
   

   1. Inspiration and Expiration signals will be marked on the Respiration channel that will help us identify the maximum R-R interval

   2. R-R interval is displayed in ms and was calculated based on our analysis
      

   3. The ECG waveform has also been completely analyzed

9. Results are also recorded on an Excel spreadsheet 

   1. Time: The beginning of a respiration cycle

   2. Min Period: Minimum R-R interval during the inspiration

   3. Max Period: Maximum R-R interval during the expiration

   4. RSA: Difference between the Max Period & Min Period expressed in milliseconds using linear scaling

HRV & RSA Analysis

1. HRV and RSA Analysis may also be conducted together
   

2. Complete Steps 2 & 3 under Respiratory Sinus Arrhythmia before proceeding to step 3

3. Go to Analysis → HRV and RSA → and select "Multi-epoch HRV & RSA - Spectral" from the options menu

4. Generate Analysis