I suggest you go through
www.cpaptalk.com which is America based with
lots and lots of information. The Forum is very active.
I am on a CPAP machine "SOMNObalance" - German, for the last two years
having been to the "Schlafmedizin" unit in Salem spital Bern and has helped
me with a heart problem too. As I am in my seventies I have benefited a
much by this therapy. The Machine is rented to the user at 4.50 Fr. per day
and borne by the Health Insurance policy.