ECG pulse duration

[09819710353]

Hi guys,

          Im working on ECG analysis using LabVIEW. Im using simulated waveforms for the purpose. What will be the best way to measure the duration of P wave or The QRS complex wave ? Please do reply I need it urgently.

[devchander]

The simplest way would be to plot the P-QRS-T wave on a 'Waveform Graph' and use 2 cursors

The user will maually select the beginning-end of P wave and find the x2-x1 ( with x axis being the time scale)

Message Edited by devchander on 03-10-2008 03:53 AM

[09819710353]

Actually I wanted to display only P waves from a set of about 30 heart beats. so that I can use it for further analysis what will be the simplest way??

[Eriquito]

Hi 098,

I'm not sure I fully understand what you are asking, but if you simply want to display all 30 "beats" on the same graph, what you could do is put the data acquisition in a loop, send the output to a shift register, and then take that waveform in the beginning of the next iteration of the loop and use the "merge signals" VI to combine it with the latest signal.  So ultimately, what you would do is merge the 30 waveforms into a single waveform to be displayed on the same graph.

You may also be interested in the NI LabVIEW Advanced Signal Processing toolkit if you will need to do more complicated operations.

[09819710353]

Hi Eric_V ! thanks for your reply

Actually Im reading from a text file to display the signal. The ECG signal with P waves marked  Im attaching to my reply. Please tell me the simplest way of displaying only the P waves from the entire ECG signal. 

[laiwei]

Hi, If you have Advanced Signal Processing Toolkit for LabVIEW, there is a demo example for ECG QRS detection using wavelet analysis method. See attached file for screen shot of the demo.