Posted by Larry Hoover on November 30, 2004, at 10:10:32
In reply to drug-induced illness, posted by lostforwards on November 30, 2004, at 8:25:33
> TD is a well documented side-effect of antipsychotics.
Even that conclusion is potentially invalidated by examination of medically naive schizophrenics.
Dyskinesia is a fundamental aspect of the etiology of schizophrenia. It may well be true that antipsychotics advance that particular aspect of pathology, bringing it on at an earlier age (one possible explanation), but blaming all cases on the medication, or even just blaming the medication, may not be valid.
J Clin Psychiatry. 2000;61 Suppl 4:10-4.
Prevalence of spontaneous dyskinesia in schizophrenia.
Fenton WS.
Chestnut Lodge Hospital, Rockville, MD 20850, USA. WSFMD@AOL.COM
Spontaneous abnormal involuntary movements phenomenologically identical to neuroleptic-induced tardive dyskinesia have been described in schizophrenia for over a century. Because at present nearly all patients with schizophrenia are exposed to neuroleptic medications, information about the prevalence of spontaneous dyskinesia is obtained from accounts from the preneuroleptic era, evaluations of first-episode patients before neuroleptic treatment, and the identification and assessment of drug-naive patients in developing countries. In this report, data from 14 studies of neuroleptic-naive patients with schizophrenia are used to generate age-adjusted estimates of the prevalence of spontaneous dyskinesia. While the precision of this estimate is limited by the difficulty of obtaining large, untreated samples, available data suggest a spontaneous dyskinesia rate of approximately 4% in first-episode schizophrenic patients, 12% for patients ill several years but below age 30 years, 25% for those aged between 30 and 50 years, and 40% for those aged 60 years or older. Relative to the incidence and accrued prevalence of spontaneous dyskinesia expected during the natural history of untreated schizophrenia, the cumulative impact of treatment with new neuroleptic agents has yet to be determined.
Br J Psychiatry. 1996 Feb;168(2):221-6.Abnormal movements in never-medicated Indian patients with schizophrenia.
McCreadie RG, Thara R, Kamath S, Padmavathy R, Latha S, Mathrubootham N, Menon MS.
Clinical Research, Crichton Royal Hospital, Dumfries.
BACKGROUND: Historical records suggest dyskinesia was observed in severely ill institutionalised patients with schizophrenia in the pre-neuroleptic era. More recent work has not found dyskinesia in never-medicated younger and middle aged patients. The present study complements this recent work and avoids the confounders of severity of illness and institutionalism by examining elderly patients in a wide variety of community settings. METHOD: Movement disorders were examined in 308 elderly individuals in Madras, India, using the Abnormal Involuntary Movements Scale, the Simpson and Angus Parkinsonism Scale and the Barnes Akathisia Scale. Patients' mental state was assessed by the Positive and Negative Syndrome Scale. RESULTS: Dyskinesia was found in 15% of normal subjects (n = 101, mean age 63 years), 15% of first degree blood relatives of younger schizophrenic patients (n = 103, mean age 63 years), 38% of never medicated patients (n = 21, mean age 65 years) and 41% of medicated patients (n = 83, mean age 57 years). The respective prevalences for Parkinsonism were 6%, 11%, 24% and 36%; and for akathisia 9%, 5%, 21% and 23%. Dyskinesia was associated with negative schizophrenic symptoms. CONCLUSIONS: Dyskinesia in elderly schizophrenic patients is an integral part of the illness and not associated with antipsychotic medication.
Br J Psychiatry. 2002 Aug;181:135-7.
Spontaneous dyskinesia and parkinsonism in never-medicated, chronically ill patients with schizophrenia: 18-month follow-up.McCreadie RG, Padmavati R, Thara R, Srinivasan TN.
Crichton Royal Hospital, Dumfries, UK. rgmccreadie_crh@compuserve.com
BACKGROUND: Spontaneous dyskinesia and parkinsonism have been reported in never-medicated patients with schizophrenia but there has been no previous study of the natural history of these conditions. AIMS: To determine the prevalence of spontaneous dyskinesia and parkinsonism in a group of never-medicated, chronically ill patients with schizophrenia on two occasions separated by an 18-month interval. METHOD: Dyskinesia was assessed by the Abnormal Involuntary Movements Scale using Schooler and Kane criteria for its presence; parkinsonism by the Simpson and Angus scale; and mental state by the Positive and Negative Syndrome Scale for schizophrenia. RESULTS: Thirty-seven patients were examined on two occasions. Nine (24%) had dyskinesia on both occasions, 12 (33%) on one occasion and 16 (43%) on neither occasion. Twenty-one (57%) had dyskinesia on at least one occasion. Thirteen patients (35%) had parkinsonism on at least one occasion. CONCLUSIONS: Spontaneous dyskinesia and parkinsonism fluctuate over time. The former was found on at least one occasion in the majority of patients. It is an integral part of the schizophrenic disease process.
Lar
poster:Larry Hoover
thread:422246
URL: http://www.dr-bob.org/babble/20041128/msgs/422302.html