Ask the doctors. I recently read that patients with coronary artery disease ought to have their blood pressure reduced to less than 120/80. I thought 120/80 was normal blood pressure, so why would you want blood pressure to be lower than normal?
D001794:Blood Pressure / Q000502:physiology*; D003324:Coronary Artery Disease / Q000503:physiopathology*; D006801:Humans; D012016:Reference Values