Working at VM... I tend to agree that one treatment a week is likely to not be as effective and would take a long time to complete.  But we do allow flexiblity in scheduling and I like to have a minimum of 3 a week if possible.

The data from Dr. Hampson's study (Hampson NB. Rate of delivery of hyperbaric oxygen treatments does not affect response in soft tissue radionecrois. UHM 2007; 34(5): 329-34) looked at this.  The group of 3 or less a week were looked at and there was no significant difference in outcome (rad cystitis and proctitis patients) compared to the group with 7 or more treatments a week.  It was also looked at with 5 or less a week vs. > 5 a week... and no difference.  They did not have enough patients that only did one a week to look at this specifically.

J Holm