Surgical treatment of oral stereotypies in horses.
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Animals↗
Biomedical subjects
R R Owen
Publications and source records attributed to R R Owen.
Geographic market areas for psychiatric and medical outpatient treatment.
The research objective was to measure the variation in the size of a facility's market areas across different diagnostic categories. Specifically, the market area radii for outpatient psychiatric services are compared to the radii for outpatient medical services. Data were collected from the outpatient clinics of the Little Rock Veterans Administration Medical Center. Visits were categorized into 100 diagnostic groups. The market radius for each diagnostic group was defined as the 75th quartile of the distribution of distances traveled. All psychiatric diagnostic groups had significantly (p < 0.05) smaller market area radii than the overall sample radius. The average market area radius across psychiatric illnesses was 62.2 miles, which was significantly (p < 0.05) smaller than the average radius across medical illnesses (90.6 miles). Results suggest that rural patients with mental illness may not receive adequate care and that specialized outreach programs may need to be developed to better serve this population.
Adult↗
Diagnosis and management of substance use disorders among inpatients with schizophrenia.
OBJECTIVE: The study examined the extent of clinical recognition of comorbid substance use disorders and the clinical management of these disorders among inpatients hospitalized for an acute exacerbation of schizophrenia. METHODS: Medical records of 42 inpatients who met research diagnostic criteria for both schizophrenia and a current substance use disorder were reviewed for information about admission evaluation, inpatient management, discharge diagnosis, and disposition. RESULTS: Alcohol use disorders were the most frequent co-occurring substance-related diagnoses, found for 86 percent of the dually diagnosed inpatients. Twenty-four patients (57 percent) did not receive a diagnosis of a substance-related disorder at admission, and 19 (45 percent) did not receive a substance-related diagnosis at discharge. Referral to inpatient or outpatient substance abuse treatment was documented for a minority of subjects. CONCLUSION: The results suggest that improvements are needed in the process of clinical care for inpatients with schizophrenia who have co-occurring substance-related disorders. They highlight a need for education of health care providers and continuous quality improvement in this area.
Adult↗
Cost-effectiveness of clozapine monitoring after the first 6 months.
BACKGROUND: Clozapine is effective in treating patients with schizophrenia who do not respond to conventional neuroleptic drugs. The drug is unique in that it is available only with a US Food and Drug Administration-mandated system for weekly monitoring of patients' white blood cell counts. No study has been conducted to evaluate the cost-effectiveness of this mandatory monitoring system. METHODS: A benchmark case was established by utilizing cumulative incidence rates of agranulocytosis from a recent study with a large sample of clozapine-treated patients. We assumed a 20% mortality among patients with agranulocytosis, $30.61 in monitoring costs each week, and 14.4 years of remaining life expectancy after detection of agranulocytosis. Based on these bench-mark assumptions, cost-effectiveness ratios in dollars per quality-adjusted life-year were calculated for the first, second, and third 6-month periods during which a patient was receiving clozapine. Sensitivity analyses were performed with more conservative assumptions in 5 alternative scenarios. RESULTS: In the benchmark case, costs per quality-adjusted life-year gained were $61,694, $925,418, and $420,644 for the first, second, and third 6-month periods of clozapine treatment, respectively. In the alternative scenarios, these costs ranged from $7923 to $46,056 for the first 6-month period and from $54,025 to $690,850 for the second and third 6-month periods. CONCLUSIONS: While the costs of monitoring patients with schizophrenia in the first 6-month period of clozapine treatment seem to be justifiable, monitoring thereafter may not be cost-effective because of the very low incidence of agranulocytosis in the later periods.
Adult↗
Awareness of illness in schizophrenia and outpatient treatment adherence.
We present a brief measure of awareness of illness in schizophrenia and test whether awareness is related to perceived need for and adherence to outpatient psychiatric treatment. A prospective design assessed treatment adherence, awareness of the signs and symptoms of schizophrenia, symptoms, neurocognitive status, and substance abuse at baseline and 6-month follow-up in 89 persons with schizophrenia. Results indicate that persons with greater awareness perceived greater need for outpatient treatment and evidenced better adherence to outpatient treatment when adherence and awareness were measured concurrently. Awareness was not related to adherence at 6-month follow-up. In addition, neurocognitive impairment was associated with lower overall adherence to treatment when reported by collaterals at baseline and 6-month follow-up. Neurocognitive impairment was, however, associated with higher self-reported adherence to medication, which suggests that neurocognitive status may bias adherence reporting in persons with schizophrenia.
Adolescent↗
Medication noncompliance and substance abuse among patients with schizophrenia.
OBJECTIVE: The study examined the effect of medication noncompliance and substance abuse on symptoms of schizophrenia. METHODS: Short-term inpatients with a diagnosis of schizophrenia were enrolled in a longitudinal outcomes study and continued to receive standard care after discharge. At baseline and six-month follow-up, Brief Psychiatric Rating Scale (BPRS) scores and data on subjects' reported medication compliance, drug and alcohol abuse, usual living arrangements, and observed side effects were obtained. The number of outpatient contacts during the follow-up period was obtained from medical records. Relationships between the dependent variables-medication noncompliance and follow-up BPRS scores-and the independent variables were analyzed using logistic and linear regression models. RESULTS: Medication noncompliance was significantly associated with substance abuse. Subjects who abused substances, had no outpatient contact, and were noncompliant with medication had significantly greater symptom severity than other groups. CONCLUSIONS: Substance abuse is strongly associated with medication noncompliance among patients with schizophrenia. The combination of substance abuse, medication noncompliance, and lack of outpatient contact appears to define a particularly high-risk group.
Adolescent↗
Substance abuse, community service use, and symptom severity of urban and rural residents with schizoprhenia.
OBJECTIVE: This study examined the relationships of substance abuse, use of community-based services, and symptom severity among rural and urban residents with schizophrenia in the six months after discharge from short-term inpatient care. METHODS: At baseline and six-month follow-up, symptom severity of 139 subjects was assessed using the Brief Psychiatric Rating Scale (BPRS), and substance abuse status was determined using the Structured Clinical Interview for DSM-III-R (SCID). Subjects' reports of mental health service use were confirmed by record review. RESULTS: Although, on average, BPRS scores indicated symptom improvement between baseline and follow-up, symptoms worsened for 27 percent of subjects. Multivariate analysis, adjusted for baseline symptom severity, indicated poorer outcomes for rural residents, substance abusers, and subjects who did not use community services. Symptoms of rural substance abusers who used no community services were worse at follow-up than those of any other subgroup. Nearly half of all subjects had less than monthly contact with community services. The greater likelihood of symptom worsening among rural residents was attributed to their less frequent use of community services. CONCLUSIONS: The findings reinforce the importance of ensuring involvement in community-based services for individuals with comorbid schizophrenia and substance use disorders. Promotion of service use by persons with a dual diagnosis may be particularly critical to the well-being of rural residents with schizophrenia.
Adolescent↗
Choosing a career in psychiatry.
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Career Choice↗
Predictors of clozapine response in schizophrenia.
The introduction of the atypical neuroleptic, clozapine, has had widespread influence not only on the treatment of the seriously mentally ill patient, but also on new drug development and on hypotheses of the pathophysiology of schizophrenia. While clozapine differs from traditional neuroleptics in its lack of extrapyramidal side effects (EPS), it also is distinct in its profile of neurotransmitter receptor affinities. In our work examining the clinical and biological effects of clozapine in patients with schizophrenia, we have identified the presence of EPS during typical neuroleptic treatment as a consistent predictor of subsequent good response to clozapine. Further, our data suggest that clozapine should not be reserved for the most chronically ill patients, but rather be utilized in patients with less chronic courses of schizophrenia. Biological predictors of clozapine response are consistent with dopaminergic, serotonergic, and noradrenergic facets to its mechanism of action.
Adult↗
Effects of clozapine and fluphenazine treatment on responses to m-chlorophenylpiperazine infusions in schizophrenia.
OBJECTIVE: To explore serotonin function in patients with schizophrenia during typical and atypical neuroleptic treatment. We hypothesized that clinically relevant doses of the atypical neuroleptic clozapine would attenuate responses to the serotonin agonist m-chlorophenylpiperazine (m-CPP). DESIGN AND INTERVENTIONS: m-CPP or placebo was administered intravenously over 90 seconds to patients who had been receiving no medications for at least 3 weeks. m-CPP was also administered during treatment with the typical neuroleptic fluphenazine and the atypical neuroleptic clozapine. PATIENTS: Fifteen inpatients (two women and 13 men) who met DSM-III-R criteria for chronic schizophrenia (n = 13) or schizoaffective disorder (n = 2) participated in the study. Mean age (+/- SD) was 33.8 +/- 8.0 years. MAIN OUTCOME MEASURES: Measures of m-CPP effects included plasma cortisol and prolactin, body temperature, and the Brief Psychiatric Rating Scale (BPRS). The final BPRS total score at approximately 12 weeks of treatment was used to assess response to clozapine. RESULTS: m-CPP infusion significantly increased plasma cortisol and prolactin levels in drug-free patients. There was a range of behavioral responses while drug-free, but no statistically significant effects on BPRS total or BPRS factor scores. Clozapine treatment significantly blocked neuroendocrine responses to m-CPP, whereas fluphenazine had no effect. Clozapine also appeared to attenuate behavioral responses. CONCLUSIONS: These results demonstrate that clozapine treatment has potent serotonin antagonist effects in patients with schizophrenia. This may be related to clozapine's therapeutic effects since patients with greater cortisol response to m-CPP while drug-free had a better subsequent response to clozapine.
Adult↗
Clinical investigation of monoamine neurotransmitter interactions.
Monoamine neurotransmitter systems are widely thought to be involved in the pathophysiology of affective disorders and schizophrenia and the mechanism of action of antidepressant and antipsychotic drugs. Previous clinical studies have focused on individual monoamine function in isolation, even though a large number of preclinical studies have demonstrated that monoamine neurotransmitter systems interact with one another. In the present paper, preclinical data on monoamine neurotransmitter interactions are reviewed, and two methods for examining monoamine neurotransmitter system interactions in clinical data are presented. One of the best replicated findings in biological psychiatry is that monoamine metabolites in CSF correlate with one another. The degree of correlation may be in part a measure of the degree of interaction between the parent monoamine neurotransmitter systems. Another approach to studying interactions is the use of HVA/5HIAA and HVA/MHPG ratios as an index of interactions between 5HT-DA and NE-DA. When these methods are applied in schizophrenia, patients are found to have decreased monoamine metabolite correlations compared to normal controls. Metabolite correlations increase significantly after antipsychotic treatment, and the HVA/5HIAA and HVA/MPHG ratios also increase, suggesting that neuroleptics may act in part by strengthening interactions between monoamines. BPRS ratings are negatively correlated with HVA/5HIAA and HVA/MHPG so that patients with higher ratios have fewer symptoms, particularly after treatment. These results provide direct experimental support for hypotheses suggesting that interactions between monoamine neurotransmitters are important in schizophrenia. Some of the effects of the atypical neuroleptic, clozapine, on metabolite correlations and ratios are also discussed.
Animals↗
Clinical and biologic response to clozapine in patients with schizophrenia. Crossover comparison with fluphenazine.
Twenty-one patients with schizophrenia who met criteria for neuroleptic treatment resistance or intolerance participated in a crossover, placebo-controlled, double-blind comparison of long-term typical neuroleptic and clozapine treatment. Clozapine significantly reduced total as well as positive and negative symptoms in comparison with both fluphenazine and placebo. Of the 21 patients, eight (38%) showed clozapine superiority on the basis of prospective response criteria. High levels of extrapyramidal side effects during fluphenazine treatment and later onset of illness were clinical predictors of clozapine superiority. Clozapine and fluphenazine equally reduced plasma homovanillic acid levels in comparison with placebo, although fluphenazine but not clozapine increased plasma prolactin level. A striking biologic difference between clozapine and fluphenazine was clozapine's enhancement of indexes of noradrenergic activity. Superior clozapine response was predicted by low ratios of cerebrospinal fluid homovanillic acid to 5-hydroxyindoleacetic acid, consistent with the notion that balance between dopaminergic and serotoninergic systems is important for clozapine's mechanism of action.
Adult↗
Endolymphatic delivery of IL2 in patients with melanoma and lymphoma.
UNLABELLED: During this phase I/II study, enodolymphatic cannulae were placed in the iliac lymphatics under general anaesthesia. IL2 was then infused via this route at escalating doses until the highest tolerated dose was achieved; then, continuous infusion was maintained for 2 to 3 weeks. Seven patients with advanced cancer (3 lymphoma, 4 melanoma), resistant to all other modalities of treatment received such therapy. Most patients tolerated 4 to 5 x 10(6) u/day of IL2 for 2 to 3 weeks with less toxicity as compared to the equivalent dosage given intravenously. No severe perioperative morbidity was experienced. One melanoma patient had a minor clinical response. Changes in circulating lymphocyte numbers and cytotoxicity demonstrated a systemic effect of endolymphatic IL2 therapy. CONCLUSIONS: The endolymphatic administration of IL2 is associated with less toxicity than the intravenous route but still achieves a systemic effect; a lower tumour burden may prove more responsive to this therapy.
Adult↗
A phase I clinical evaluation of liposome-entrapped doxorubicin (Lip-Dox) in patients with primary and metastatic hepatic malignancy.
Liposome-entrapped doxorubicin (Lip-Dox) was evaluated in two phase I clinical trials in patients with hepatic malignancy. Patients with metastases from primary gastric or colonic tumours and patients with hepatoma were eligible. Lip-Dox was extremely well tolerated and acute toxicities such as nausea and vomiting were totally eliminated; no antiemetics were used even at doses of 80 mg/m2. Toxicities such as alopecia and myelosuppression were also ameliorated. There were tumor regressions and reductions in hepatomegaly in patients treated on both the weekly and 21-day studies. The maximum tolerated dose (MTD) in the weekly study was 22.5 mg/m2/week and in the 21-day trial the MTD was 70 mg/m2.
Adult↗
Cardiorespiratory responses to upper extremity aerobic training by postpolio subjects.
The cardiorespiratory responses of ten postpolio subjects participating in a 16-week upper extremity aerobic exercise program were compared to ten non-exercised controls. The subjects trained three times a week for 20 minutes per session. Exercise intensity was prescribed at 70% to 75% of heart rate reserve plus resting heart rate. Dependent variables were resting heart rate, maximal heart rate, resting and immediate-post-exercise systolic and diastolic blood pressures, maximal oxygen consumption, maximal carbon dioxide production, minute ventilation, respiratory exchange ratio, power, and exercise time. After training, the exercise group was superior to the control group in oxygen consumption, carbon dioxide production, minute ventilation, power, and exercise time. There was no reported loss of muscle strength. It was concluded that postpolio subjects can safely achieve an increase in aerobic capacity with a properly modified upper extremity exercise program. This improvement is comparable to that demonstrated by able-bodied adults.
Adult↗
The acute effects of central- and peripheral-acting dopamine antagonists on plasma HVA in schizophrenic patients.
The short-term effects of fluphenazine on plasma HVA concentrations were compared with the effects of fluphenazine and concurrent administration of debrisoquin, a monoamine oxidase inhibitor which does not cross the blood brain barrier and is used to enhance the CNS contribution to circulating plasma HVA concentrations. Fluphenazine significantly increased plasma HVA with or without debrisoquin 24 hours following the initiation of treatment. Domperidone, a butyrophenone dopamine antagonist which acts only in the peripheral nervous system, failed to alter plasma HVA concentrations. These data suggest that the acute effects of neuroleptic drugs on plasma HVA concentrations are dependent upon interaction with CNS dopaminergic systems and provide additional support for the use of plasma HVA as a reflection of CNS dopamine system activity in clinical studies.
Adult↗
Postpolio syndrome and cardiopulmonary conditioning.
Postpolio syndrome is a group of related signs and symptoms occurring in people who had paralytic poliomyelitis years earlier. New weakness, fatigue, poor endurance, pain, reduced mobility, increased breathing difficulty, intolerance to cold, and sleep disturbance in various degrees and expressions make up the syndrome. The reported incidence is between 25% and 80%. The origins are multifactorial and can be associated with underexertion, overexertion, inactivity due to intercurrent illness or injury, hypo-oxygenation, sleep apnea, deconditioning, and the failure of sprouted, compensatory large motor units. The exercise question in postpolio syndrome is related to the experience of new weakness or loss of muscle function due to overuse, which is often associated with injudicious repeated challenges to weakened musculature. Carefully prescribed exercise can be used for increasing strength and endurance and improving cardiopulmonary conditioning.
Cardiovascular System↗
Response to clozapine in chronic psychotic patients.
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Adult↗