I concur with Dennis. The USB-6211 has two analog output channels, and it supports external triggering. It costs $895. Your pulse can be used as a trigger to the 6211. You would have to set up the 6211 (don't use express vi, use the DAQmx functions) for external triggering. Look for examples on this. You would have to write the EKG waveform to the DAQ, and then use the initiate function to arm it. Then when the pulse comes in, the analog output would be triggered and would send out an EKG pulse. Put the write and initiate inside a loop and it would continue to send EKG pulse on every trigger pulse. Don't forget to put a small delay in the loop and to use shift registers for the error wires and DAQ reference wires.
