A new patient forgot to mention on the telephone that she has mitral valve prolapse with valvular regurgitation, even when she was asked by the dental office receptionist if she had any medical alerts to report. All she could remember to say at the time was that she had no allergies. The patient is now sitting in the operatory, ready for her initial appointment to have her severely bleeding gums looked at. How should the dental assistant handle this situation? Why does this patient warrant a change in dental treatment? What drug will need to be given to the patient?