I was in clinical the other day on PCU (which is the progressive care unit), it is basically a cardiac floor. My instructor asked me why you measure heart rate and blood pressure together. I said they are directly related because the force your heart has to pump is dependent upon the pressure it arteries that your heart has to pump against. She said that isn't right and I needed to look it up. I have been researching all weekend and can't find anything. Any help would be appreciated.