Filtering an impedance measuremen​t

Hello,
I am in the process of developing a bio-impedance measurement system: we are using an external stimulation signal (of known amplitude, frequency and phase) and measure two pressure signals (the impedance is calculated from these). However, the heart acts sort of as a secondary stimulator, which puts an unwanted interference in our signal. The problem is, that the heart's frequency is right in the range of our stimulating signal, so we cannot use a simple high/low-pass filter, plus the heart's frequency and amplitude changes a bit in time. This interference is sometimes tolerable and does not bother the analysis, while sometimes it makes analysis nearly impossible.
Can we get rid of this secondary component from our signals? We have the blood pressure data recorded, which correlates with the heart's activity and I guess this might be some starting point for the filtering. What should I do? (I have no expertise with filtering, unfortunately).
Thanks very much
Engage! using LV2012

Thanks for looking into it.
Here I attach a rough image of our setup: we have the stimulator to create a pressure signal, p2 is right at this stimulator (abount an inch further), while p1 is further from it (about an inch from the subject). The stimulator is attached to the subject via a tube, and the pressure transducers are sampling from the inside of the tube.
1. This I guess explains, why P2 is so similar to the original.
2. I think, the last column is not actual data.
3. We are using an NI-6211, so I guess we can get to higher sampling rates. However, previously we have used 128 or 256 Hz for quite a long time and they were more or less fine, although we did not try automatically removing heart interference. How high should I go? We are now working on 3-4 channels, however we plan to include some more channels, not more than 8 (with differential reading).
4. Ok, I'll loop back the AO to an AI. (Or can I somehow read it back from software? I am using a continuous generation based on NI cont. generation example)
5. That's right, I want to suppress heart-related components.
6. Right now I do not know exactly, however as I have some new subjects, I'll try to get some measurements with no heart as well. (although it will be two separate files: one with heart present and another one without heart)
7. We only need impedance at frequency components of the stimulation signal, and we need the complex impedance (however not as mag/phase, but re/im, but I guess it's marginal)
8. Yes, rats.
Actually, if you think it's better, we can get ECG instead of the blood pressure, however I think that blood pressure might correlate more with our interference.
Engage! using LV2012

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