Negative symptoms of schizophrenia and the dexamethasone suppression test.

The dexamethasone suppression test (DST) was administered to 30 inpatients who met the DSM-III-R criteria for chronic schizophrenia and shared similar environments. Four of them (13%) were DST nonsuppressors. The mean and maximum postdexamethasone cortisol levels were correlated with the patient's score on the scale for the Schedule for the Assessment of Negative Symptoms and with the score on the anergia subscale of the Brief Psychiatric Rating Scale. None of the correlations were statistically significant. Furthermore, the scores on the above scales were not significantly correlated with clinical variables such as duration of illness, number of admissions or length of hospitalization, nor were any significant correlations found between the postdexamethasone cortisol levels and the score on the Beck Depression Inventory. In addition, depressed and nondepressed schizophrenics did not differ regarding the rate of nonsuppression and the postdexamethasone cortisol levels. This study found that: 1) dexamethasone nonsuppression in schizophrenia was not related to the presence of negative symptoms; 2) there was no relationship between negative symptoms and illness variables; and 3) the depressed schizophrenics did not display increased nonsuppression compared with nondepressed schizophrenics.