Do you need to physically generate an analog ECG signal and then acquire it with a DAQ card?
If so, you could use the analog output of the DAQ card to create the ECG signal, or if the DAQ card has no Analog Output, you can use the sound card to create analog signals. The LabVIEW Graphics and Sound>>Sound>>Output palette
contains VI's that allow you to utilize the sound card with an API that
is "similar" to the DAQmx API. The "
Learn LabVIEW 8 in 3 Hours" manual has a track that involves creating an application that interfaces with the sound card. There are also several example programs (Help>>Find Examples) that interact with the built in sound card.
The other option would be to simply simulate the signal. The data in the above posts should be ok for building a waveform within LabVIEW.
Spex
National Instruments
To the pessimist, the glass is half empty; to the optimist, the glass is half full; to the engineer, the glass is twice as big as it needs to be has a 2x safety factor...