The best place to start would be to review vital signs, weight and height norms for children of each age group. Do some peds drug calculations to refamiliarize yourself with how the dosages are determined. Most of our drugs are weight-based doses, so invent a few pretend patients and calculate meds for them. The most commonly used drugs in a peds CVICU would be things like infusions of epinephrine, norepinephrine, milrinone, heparin, amiodarone, morphine, midazolam, fentanyl, propofol, prostaglandin, furosemide and nitroprusside. Intermittent meds are usually things like morphine, lorazepam, chloral hydrate, cefazolin, piperacillin-tazobactam, magnesum sulfate, furosemide, Aldactazide, calcium chloride, acetaminophen, ibuprofen, captopril, sildenafil and so on. You can look at just about any drug resource and find peds doses listed. Have a look at www.cincinnatichildrens.org
at their interactive cardiac section and check out the major cardiac lesions. And maybe take a look at the PALS algorithms, although I don't think you'd need to memorize them until such time as you're actually taking PALS. And if the opportunity presents itself in the interview to throw out something about asking the parents how the child usually behaves, reacts, responds to meds etc, GRAB IT!!