In hosp. After a vfib, the cardio doc said he hadn't seen anything like it before and was sending it around the country, where would he send or post?

Medical journals. Rare cases are usually reported in medical journals to educate other physicians and once published they are available to any dr around the world especially if accessible on the internet.
Docs referral source. Most likely he would discuss with professional colleagues or in hosptial committee or academic grand rounds.