Hi, my nephew is 40 years old, he had had heart problem, I think heart failure 2 years ago and a device implanted to him (pacemakers),2 months ago, he has no history of hypertension or any disease before, but now he is complaining of intermittent numbness in his arms and feet, could you tell me please, this is because of the device or not related to this, he developed hypotension sometimes and the doctor advice him to decrease the dose of drug which he is taking(diuretics), because he developed dizziness and fainting few times and his cardiology doctor told him that his device work properly and its not the cause, please tell me is this numbness is a serious problem and he must go to which specialist for this, what is the probable disease or problem he may have, could be neurological?! thanks