I can only recommend that you discuss this with your doctor before starting. We're all so different and one experience will not mirror what you could go through while on the cleanse. I have an irregular heartbeat (SVT) and consulted with my cardio before going on the cleanse. We worried about maintaining a proper electrolyte balance (since I'm not taking in any protein, fat, etc). I took a daily dose of magnesium and potassium on the cleanse and not once did I go into SVT while cleansing. I continue to take 2 heart medications daily. This isn't an option for me.
But I can tell you that while on the cleanse I do not suffer from skipped beats, as I often do other times. Coincidence -- who knows?
Again - I'd recommend getting your doctors blessing and advice before proceeding.