I want to measure te time between the peaks

[merrythomas]

I need to measure the time between each peaks (QRS peak) in an ECG waveform continuously and plot on the chart.

Can u please help me with this.

[Steven_T]

Hello Merrythomas,

You really didn't give the forum much to go on.  There are several algorithms out there that you can find using google.  After you find and choose an algorithm you can put it together in LabVIEW using the basic functions or using some of the point by point functions that are available.  Peak Detector Point by Point may be able to help you get the peaks.  You have to give it the data point of interest and it will be able to signal a true when it detects a peak over a presepecified value. 

I hope this helps.  Post back with more information.

Steven T.

[merrythomas]

Hi steven

Thanks for the quick reply.

My aim is, i need to measure the time intervals between each R - R peak and plot each on the chart. i am getting clear ECG signals using the DAQ assistant.

This is to study the variation in RR intervals within ECG.

Is this information OK for you to help me out.

[Steven_T]

Hello MerryThomas,

It looks like the point by point peek detection vis will help you.  Feed in a single value from your array with the ECG values.  Also wire up a constant that all of the peeks are above.  It will alert you when it runs into a peek by returning a true instead of a false.  You can then take note of the index or x value of the element that coincides with the peak and use the difference between them to get your values. 

Post what you have after you try using this VI if it doesn't work.

I hope this helps.

Steven T.

[kok]

i wanted to ask you Dear frend do have the exp that mesure the R-R time i need the exp ASAP pleeeeeeeeeeeeeeeeeees

i'm not that one in LABView so i need you fast support 

my mail is molaywe@gmail.com

[Steven_T]

Hello kok,

Here is an example.  I am using a sine wave instead but it will still work.  Just put in the threshold to be above the itnermediate peaks that you want to ignore but below the peaks you want to get.  The VI will then tell you what location inside of the array the peak occured.  You can subtract each location from each other to find how many elements pass between peaks.  You can then multiply the number of elements between peaks by the amount of time between each sample.  I hope this helps.

Steven T.

[Joaana]

Hi Stevan,

  I badly need the vi to compute the RR interval....I am using Labview 8 version and the rrmeter.vi that u have attached is in higher version i sppose ..plzzzzzzzzzz can u send me a similar .vi to compute the RR intervals in ECG and store in an array ( coz i need to actually calculate some statstical parameters based on this).

 Plzzzzzzzzzzzzzz its URGENT. Thnx in a advance

[Dennis_Knutson]

Here it is in 8.0.

[nitin111]

how did you find the difference between the locations of the peaks???.....please explain me the procedure