Fortunately,
who you know can make
what you know look even better. You have good experience in CVICU. That can be valued as a strength, even with the short amt of time. But the fact that you have a good relationship already with the committee is definitely going to make you stand out.
Just because they have received 500 apps doesn't mean they will take 500 interviews. Just like I tell my pts, deal w/ the small goals first. Right now focus on getting the interview and what they will ask you. Clinical questions- you can freshen up now while you wait. Since the committee knows you, they might expect more out of you. Sad but true, they may try to pick on you.
Most importantly, be prepared for anything and interview strong. SELL YOURSELF!
Did you apply to only 1 program? It's always nice to have a backup.
Good luck to you!!