I'm going into EM in 1 month and can't wait. A bit of advice is that you'll want to do at least a couple away audition electives. If you can do an away elective in a EM subspecialty (tox, peds, sports, ultrasound) that still gets you exposure to the program, and you get something extra out of it, imo. As for some non-EM electives, my advice is to actually
1. Not do rotations that you'll have to do in EM residency. So I don't recommend anaesthesia to learn intubations, I don't recommend SICU or CCU for high-risk patients. Ortho and cards are another story though since you may not have set-aside time to really learn casting and EKG
2. For any rotation you do want to do, call up the department, tell them exactly what you're looking for in a rotation, and find out if you can get what you want out of the rotation while learning what they want you to learn.
So here's some thoughts on specific rotations:
1. Cardiology - but only if you get a ton of EKG training. Basic cardiac u/s also isn't a bad idea, depending on how much ultrasound is taught at your program.
2. Derm - you'll have to see plenty of rashes. It's a good idea to do a rotation just so you can learn derm lingo (if you don't, any derm consults are messy). If you're lucky, you'll see the 1 or 2 derm emergencies you'll need to recognize.
3. Optho - not all programs have you do optho. But if you do this, make sure you're going to use equipment that you'll actually have in an ED, make sure you don't have much surgical time, make sure you're not going to spend a lot of time at a glaucoma clinic or anything like that. You need to learn acute eye issues, not chronic ones, not surgical ones, not ones you need a special retinal camera to see.
4. Radiology - only bother with this if you're gonna get a lot of plain film training with ppl who read the ED and ICU films. Or if your school doesn't have it as a required rotation. Don't bother otherwise.
5. Neurology/Neurorad - only deal with this if ur neuro-required rotation is crappy or you don't do one. Otherwise, you should be able to do a good neuro exam on your own, and be able to read head CTs for masses, strokes, bleeds at this point
6. Ortho - you may not have set-aside ortho time in ur residency. So anything dealing with fractures, ortho exam, reductions, casting is good. Stay out of the OR
7. Trauma Surg - eh I don't really recommend this. EM is not a surgical field, trauma is protocol-driven. You won't get anything out of this that you can't get from ur ATLS course and 3-4 years of EM residency.
8. Anaesthesia - I know I said don't worry about intubations. But, if you can find an anaesthesia rotation where you learn lots of nerve blocks, then you will really get something out of it that you might not get in your residency. I kind of regret I didn't have time for this.
9. ICU - as I said don't bother. BUT, peds ICU, now there's something you could get a lot out of. You can never see enough sick kids. EVER.
10. Renal - I've heard it recommended by one ED PD. I don't know why he recommended it. I personally hate Renal phys. If someone can explain to you why you shoudl take this with good reasoning behind it, give it a thought.