Abdominal Aortic Aneurism
This didn't seem to be in our list of diseases, but Dianna, my new, tireless googler of all things chlamydial, found it: http://www.smokershistory.com/cpaaa.htm They may have an ax to grind, but the number of papers cited seems pretty convincing.
When I link that information with David's http://www.davidwheldon.co.uk/chl_vasc.html (he mentions aneurism), where he describes the wide pulse pressure that develops with C.Pn., and with Peckerman's tilt-table results that show CFS is characterised by diastolic dystrophy, it sounds even more likely.
I know (but can't remember from where) that AAA's are most likely to occur at a point about one-half wavelength above the bifurcation of the aorta (where it splits to form the femoral arteries.) That's where the "echo" bouncing back from the split meets and reinforces the pulse coming down from the heart. It seems plausible that the stiffened aorta would make a sharper pulse and echo, and also can't "soak up" the shock wave at that point the way it should.