You obviously know your stuff so that isn't the issue. Be confident in your accomplishments to date.
For the Power Point presntation a few tips, keep it to 3-4 points per slide. Keep them as points or else you will be glued to the screen instead of to your audience.
You know the requirements better than we would but consider making your presentaion more about logistics or managing acute care facility as opposed to acute care nursing itself.
Looking at each member of the panel as you are talking will demonstrate confidence on your part. These people are not looking for a follower but someone to lead and they will need to see confidence on your part. Note I ddin't say eye contact. That intimidates both you and the panel member. Look at the face but prolonged direct eye contact is not necessary as a presenter.
Last but not least breathe. Actually put down in your notes to breathe. Before you even start to speak, take a deep breathe, exhale then another, then start talking. This relaxes the vocal chords allowing for better resonance which exudes confidence.
I am a professional trainer, motivational speaker and am actively involved in the hiring process for my company. If I can be of any help please feel free to contact me.
I'd wish you best of luck but it sounds like you already have the experience and skills necessary so that luck is not really needed!
All the best
Uzzah