I work in a sub acute unit and we have a wound care nurse who visits and gives new orders once a week. I have a pt who had a substantially large wound and she has continuos problems with the vac beeping and the dressing losing suction pressure. I have asked the cnas and therapist to please be careful when caring for and dressing her. Any ideas what can cause this or how I can improve the dressing stating intact? The charge nurse changed the dressing yesterday and 1 hr later I had problems and no drainage???