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CBT administered in weekly sessions for several months is an effective treatment for panic disorder. Several open trials have suggested that delivering CBT in a “massed” dosing pattern, consisting of an intensive immersion experience for just a few weeks, may also be effective. These investigators conducted a randomized controlled trial of this hypothesis by assigning 39 patients with panic disorder to 26 hours of CBT, either as massed treatment (20 hours in week 1; two 2-hour sessions in week 2; and a single 2-hour session in week 3) or on a standard schedule (13 weekly 2-hour sessions). CBT after the first session was conducted in group settings.
Follow-up at 3, 6, and 18 months after treatment revealed significant improvement in both grou…