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> > No doubt about it, and it's the *peripheral* autonomic system as > well. > Then my next question is....how does PD affect the heart and respirations?? We have heard from many folks on this list who have problems with sleep apnea - as well as other respiratory abnormalities. Some of our past participants have died suddenly - which makes one wonder about the effects of PD on the heart. Have studies been done on the effects of PD on these two systems? ----- God bless Mary Ann