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The best way would be to apply a (time,voltage) dataset of ECG samples to Multisim's PWL (piece-wise-linear) source. Ofcourse you would have to find this dataset somewhere.
I happen to have some sort of ECG signal on my computer that you can try.
I tried this method to simulate ecg signal on multisim13. I copy the ECG Electrode.llb file from the zip file to D:\National Instruments\Circuit Design Suite 13.0\lvinstruments. And I opened the multisim. but there is no ecg signal option under the Labview Instrument.