Undergone mitral valve correction surgery last year. Now taking Prolomet 50 mg (8 am), lasilactone 50 (8 am), Ramipress 2.5 mg (10 am), Ecospirine 75 mg(1 pm) and aztor 20 mg (8 pm). Now urinating at least 4 times during morning hrs, between 10 and 12, what is the reason?