title: Plasma HVA, tardive dyskinesia and psychotic symptoms in long-term drug-free inpatients with schizophrenia.
abstract: Plasma homovanillic acid (pHVA) levels were measured in 16 chronically ill patients with schizophrenia who also suffered from tardive dyskinesia, and in a group of 14 chronically ill patients with schizophrenia who did not have tardive dyskinesia. All patients were studied following an extensive drug-free period (mean = 32.9 months). Patients with orofacial dyskinesia had significantly lower levels of pHVA than did controls. In patients without tardive dyskinesia, pHVA levels were significantly correlated with both positive and negative symptomatology. In contrast, pHVA levels from patients with tardive dyskinesia bore neither a significant nor a nearly significant relationship to symptomatology. The implications of these findings for dopaminergic models of tardive dyskinesia are discussed.
authors.affiliation: Dipartimento di Scienze delle Comunicazioni Umane, 2nd Medical School, University of Naples, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Muscettola
authors.forename: G
authors.initials: G
authors.lastname: Barbato
authors.forename: A
authors.initials: A
authors.lastname: de Bartolomeis
authors.forename: P
authors.initials: P
authors.lastname: Monteleone
authors.forename: D
authors.initials: D
authors.lastname: Pickar
mesh_terms: D000368:Aged; D002908:Chronic Disease; D004409:Dyskinesia, Drug-Induced / Q000097:blood* / Q000523:psychology; D006719:Homovanillic Acid / Q000097:blood*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009460:Neurologic Examination; D011569:Psychiatric Status Rating Scales; D012559:Schizophrenia / Q000097:blood*; D012565:Schizophrenic Psychology
chemical_list: D006719:Homovanillic Acid