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ECG EKG sensor protection - diodes

ECG leads generally see voltages in the range of -5mV to 5mV and a frequency range of .05Hz - 150Hz. We are peripherally stimulating the patients with up to 200v at a frequency of 1kHz elsewhere on the body for about 100mSec and it disrupts our front-end ECG chip. I need to protect the ECG leads from the stimulation. Although the system recovers, it takes far too long. How could we do this?
 
Notch filter perhaps.
Perhaps even just low pass filter.
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Do you know whether the influenece on the ECG/EKG only the stimulation directly, or perhaps resulting EMG from a reaction to the stimulation. In other words, do you know whether the interference overloading the ECG is the same signal as the stimulation or includes in-band interference?
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Is the stimulation always applied in the same place and therefore a predictable level?
 
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