If you need a specialist, these people are great, I used the cardio vet for Sugar. If I remember correctly, they are in you part of town, too.
ARIZONA VETERINARY SPECIALISTS, LLC
86 West Juniper Avenue
Gilbert AZ 85233
Phone: 480-635-1110 (AVS) 480-497-0222 (EAC)
http://www.azvs.com/