Despite advances in the management of patients with obsessive-
compulsive disorder, some remain refractory to treatment. The authors
retrospectively examined characteristics of 43 treatment-resistant
obsessive-compulsive patients and found that those with concomitant
schizotypal personality disorder had an extremely high rate of treatment
failure. Of the 29 treated nonschizotypal patients, 26 (90%) improved at
least moderately; only one of 14 (7%) schizotypal patients improved. In
addition, the number of schizotypal features in each patient was strongly
negatively correlated with treatment outcome.
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