Prelim medicine, the medicine year will make you a doctor. Need to do many months of floors and ICU, night float will be invaluable, get good cards and pulm exposure.
the year of knowledge cannot be emphasized enough. Get good practice treating common medical problems, Afib, CHF, PNA, AKI, DKA, etc, common medical workups, common ICU problems, learn to read EKGs like a boss, learn to read chest films like a machine, these are the things that are important. Don’t be that guy who can’t read an EKG unless it’s anything but a STEMI. I’ve seen anesthesia residents like this, it looks bad, we’re supposed to know this stuff, not cardiology level, but definitely IM level.
I felt the same way about procedures after my intern year. I did medicine and was very disappointed I didn’t put in a single line. That stuff is easy to learn, looking back after completing residency, people perseverate on the procedural stuff. It’s as if that’s all they think anesthesia is. You have three years to do procedures, yes they are fun, but they’re also easy to learn. A surgical year will probably just make you think less like an IM doctor, which is a disservice to you as an anesthesia resident.