Wechsler intelligence scale findings in obsessive-compulsive disorder patients with pervasive developmental disorder *
Recently psychiatrists have noted Pervasive Developmental Disorder (PDD) in difficult cases of mental disorder. Patients with treatment-resistant Obsessive-Compulsive Disorders (OCD) are highly likely to have PDD. Early identification of PDD, ideally during initial assessment, in patients with OCD would lead to more effective treatment. However, there has been little research on the features of OCD patients with PDD especially in adults. We investigated Wechsler Adult Intelligence Scale - Third Edition(WAIS-III) findings of 64 OCD patients (18-64 years old, 25 males, 39 females) and diagnosed 19 of the patients (10 males, 9 females) as PDD. The 19 PDD patients consisted of 2 autistic disorders, 10 Asperger disorders, and 7 PDD-Not Otherwise Specified. Between the PDD group and the non-PDD group, there were no significant differences in age, severity of OCD, VIQ (verbal intelligence quotient), PIQ (performance IQ) and FIQ (full scale IQ). We found that the PDD group had significantly higher scores of "PIQ-VIQ" than non-PDD group. Logistic regression of WAIS-III subtests revealed that the high scores of "Similarities" subtest and the low scores of "Coding" subtest was significantly associated with the presence of PDD. These results suggest that by paying particular attention to the "Similarities" subtest and "Coding" subtest it may then make it easier to increase the chances of recognizing the presence of PDD when we assess the treatment for OCD patients. (Accepted on June 15, 2012)
