You need to call and ask the program director at every program you're interested in applying to. Also ask about their track record for taking non-anesthesia residents in their programs. Do they make any "accomodations" for PM&R or neuro residents? Be persistent.
New ACGME requirements will specify a specific number of directly observed intubations, IV starts, and other skills for non-anesthesia residents. Many programs will allow non-anesthesia residents to burn an elective acquiring advanced airway, IV access, and ACLS/ATLS skills while the anesthesia residents spend a month in ortho/PM&R/musculoskeletal clinic learning physical exam. Others "strongly encourage" you acquire these skills before starting which can be difficult if you're limited in electives in your PM&R residency. If you do have the option of doing this, contact the anesthesia program director at your institution and say you want to set up an elective in anesthesia acquiring some basic skills (intubations in the OR in the AM, hanging out in the PACU doing IV starts) or any kind of CA-1 level anesthesia "scut work" you can get your hands on. You will likely be welcomed with wide open arms and the experience will pay you dividends.
Epidural and others might have more to add on this topic.
