Your medsurg/tele background will be helpful but you will be learning a 95% different way of taking care of patients. Your assessment skills will change. You will become extremely detailed and focused with charting, numbers, positioning, serial labs, and managing multiple drips.
You will learn more about respiratory and cardiac physiology than you ever imagined you would need to know. Advanced ventilation modalities and oxygen delivery systems. IABP, CRRT, PA Catheters, Rotaprone and Rotarest, Heliox, Nitric Oxide, etc.
Meds you'll use frequently: Diltiazem gtt, amiodarone gtt, Lidocaine gtt, Heparin gtt, Dopamine, Norepinephrine, Epinephrine, NeoSynephrine, Dobutamine, Xigris, Argatroban, Albumin, Fentanyl, midazolam, lorazepam, propofol, and precedex.
You will hopefully become well versed on the mechanism of actions of those gtts and not just that "it's a beta blocker, or a calcium channel blocker."
Most of all....keep an open mind and always ask for help!
Enjoy the ICU!