hello thanks for posting here. i have gone through your complaints. First of all when you say slow heart beat we need to confirm whether it s really slow or u feel that way. For this you have to measure count your heart beats or pulse or alternatively take an EKG, when you have such symptoms. It can be counted by placing two fingers on the forearm just below the wrist on thr side of the thumb. count the pulse for atleast 20 secs and multiply the figure by 3 (to get one minute reading). if this figure is above 55 then you need not worry. since you have hypothyroidism, your heart beats can be slow when you are on medications. you can do a thyroid function test to check your thyroid levels and to ascertain whether the doses you are taking are proper. Regarding MVP, usually tbereis no treatment unless there are other complicatio associated with it. MVP can cause leak from the valves - which needs no treatment if mild. If valve leak is moderate or severe, then you ahould be put on diuretics. This leak can be ascertained by a 2 D echo. however most patients of MVP I have seen have non significant or no leaks and require no treatment. Also it does not put you at the risk of heart disease. your site pulse maybe due to thyroid issues. don t worry even if complications aise, everything can be treated with medications and you won t require any surgery. regarsing precautions which you asked, there are no specific precautions, but you muet be regular with your follow ups and 2 D echo must be done every year. thank you.