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A) Haven't seen Ben Khan's name mentioned in a long time...tis unfortunate as he is a hero in my eyes as nearly a Father of clustermasks and CH abort with O2. Best to you Ben...I hope you are well and PF. B') Early in my use of O2 as an abort I would sometimes get "rebound" hits 20 minutes after the initial abort...twas frustrating, annoying, scary, and a waste of O2....but it passed. Batch has postulated that it has to do with either failure to: completely abort hit (not on O2 long enough) or lack of "toning" of the blood vessels involved in constriction and therefor relief from a CH hit...ya gotta train 'em to constrict....that's good enough for me. Best Jon

Did you know that there was a time, not so very long ago, when "leonine features" were considered to be a characteristic of people with CH? A doctor suggested that in 1972, but it was still being discussed in the literature in the 1990s (https://www.ncbi.nlm.nih.gov/pubmed/1468913?dopt=Abstract), and still appears in some CH-related information today. It seems ridiculous now (to me at least), along with other once-accepted "truths" such as that women don't get CH (they're just overreacting to migraines); that people with hazel eyes are predisposed to CH; and that people with CH tend to be substance abusers. I think these things were probably all well-intentioned efforts to get a better handle on CH, but of course they all also led to harm in terms of getting an accurate diagnosis.