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Biomedical subjects

A Aberg-Wistedt

Publications and source records attributed to A Aberg-Wistedt.

At least 19 recordsLinked to original sources
PubMed2001

Effects of long-term lithium treatment on monoaminergic functions in major depression.

Platelet [14C]serotonin uptake, the density of serotonin transporters and 5HT(2) receptors, and 5HT(2) and alpha(2) receptor function in platelets were investigated in 29 outpatients (15 women and 14 men) diagnosed as having a major affective disorder (21 bipolar and 8 unipolar). The data were compared with data for 26 healthy volunteers matched for age, sex and season. No differences were found in the mean values for the uptake velocity (V(max)) and the affinity (K(m)) of the transport carrier for serotonin between patients and controls. However, female patients had lower V(max) compared to male patients and female control subjects. A positive correlation between plasma lithium and V(max) and a tendency toward a negative correlation between plasma lithium and K(m) was observed. Furthermore, there were no differences in platelet B(max) and K(d) for [3H]paroxetine binding and K(d) for [3H]LSD binding between patients and controls. However, there was an increased number of platelet 5-HT(2) receptors and a difference in serotonin-mediated potentiation of platelet ATP secretion between patients compared to controls, especially in women. The findings in the present study suggest that lithium has a net ameliorating impact on serotonin uptake which may render it resistant to change. They also postulate that the effect of lithium may be attained by a dual influence on postsynaptic serotonergic structures, as it increases both the density and the sensitivity of 5-HT(2) receptors.

Adult↗
PubMed2001

[Patient based care registries as a tool to follow up services].

The Federation of Swedish County Councils and six medical specialties are working together in a project aiming to support and stimulate the development of patient based case registers as a tool to follow up, evaluate, develop and manage medical units. The project is based on participation on the part of the medical professions in a process-oriented way. Each case register shall be based on the individual patient, and will integrate inpatient and outpatient care, all medical professions and important procedures. In hematology the project also seeks to merge case costing data with the patient based case registers in order to facilitate more comprehensive cost analysis and comparison. This episodic perspective is useful for providers per se as well as in discussions between purchasers and providers as a method for understanding and analyzing medical services. The six specialties are hematology, obstetrics and gynecology, ophthalmology, otorhinolaryngology, dermatology and sexually transmitted diseases, and lastly psychiatry.

Databases, Factual↗
PubMed2001

Tryptophan depletion in lithium-stabilized patients with affective disorder.

Central serotonergic function abnormalities are thought to be associated with the pathogenesis of affective disorder. Reduced serotonergic function, induced by tryptophan depletion, has in several studies transiently reversed the antidepressant effect of SSRIs in depressed patients in remission. Serotonergic pathways are suggested to be of importance in the mechanisms of the action of lithium. The purpose of this study was to investigate whether the stabilizing effect of lithium is dependent on short-term availability of serotonin. Tryptophan depletion was induced in thirty patients with affective disorder (20 bipolar and 10 unipolar), all stabilized on lithium treatment for at least one year. The study was performed using a randomized, double-blind, controlled design. Plasma tryptophan was reduced by 80% in the experimental group and 16% in the control group. However, no clinically relevant mood changes were observed. Transient reduction in serotonergic function does not seem to affect mood in affective-disorder patients stabilized on lithium treatment.

Adrenocorticotropic Hormone↗
PubMed2001

Serotonergic function in major depression and effect of sertraline and paroxetine treatment.

We investigated platelet [14C]serotonin (5-HT) uptake and lysergic acid diethylamide [N-methyl-3H] ([3H]LSD)- and phenyl-6'-paroxetine ([3H]paroxetine) binding in 30 patients with major depression at baseline and after 6 months of treatment with either paroxetine or sertraline. The study was of a double-blind design. Baseline data was compared with an age- and gender-matched group of healthy volunteers. Baseline Vmax was significantly lower in patients than in controls. Bmax for [3H]paroxetine binding were similar in patients and controls, but patients who suffered their first depression had significantly lower Bmax for [3H]paroxetine binding than patients who had suffered multiple depressions. Twenty-three patients (76%) (13 in the paroxetine group and 10 in the sertraline group) responded to treatment as judged by a 50% or more reduction in Montgomery-Asberg Depression Rating Scale (MADRS) scores after 6 months of treatment. There were no significant differences between the paroxetine and sertraline treated groups. Both paroxetine and sertraline caused a significant reduction in Vmax and a significant increase in Km. There was a strong correlation between Km and plasma drug concentration in patients who experienced their first depression but not in patients who had suffered multiple episodes. Bmax for [3H]paroxetine binding increased after paroxetine treatment while the opposite occurred after sertraline treatment. There was a significant interaction between the impact of drug and earlier depressions. All patients included in the study had been drug free for at least 2 months. Earlier antidepressant treatment may have long withstanding effects on the serotonin uptake machinery but it cannot be excluded that the sensitivity of the uptake mechanism may become more resistant to change in patients with recurrent depressive episodes.

Administration, Oral↗
PubMed2000

Age of onset in affective disorder: its correlation with hereditary and psychosocial factors.

BACKGROUND: Affective disorders probably have a multifactorial aetiology, both biological and psychosocial factors may be of importance at onset as well as at relapses. The aim of the study was to investigate how the age of onset of bipolar and unipolar disorder relates to family history of affective disorder, early parental separation and life events. A second purpose of this study was to analyze the importance of life events preceding the first and subsequent episodes of affective disorder. METHODS: The case records of 282 patients (161 females/121 males; mean age 56) were investigated. They all had a DSM-IV based diagnosis of either bipolar I/II (67%) or unipolar (33%) disorder. Variables, such as family history, early parental loss and life events according to Paykel life events scale, were examined. RESULTS: We found a significantly lower age of onset in bipolar patients with a family history of affective disorder (28.9 vs. 33.9 years). Bipolar patients with preceding life events had a higher age of onset (33.1 vs. 28.3 years). Moreover, bipolar patients with heredity, had less life events at onset. For the bipolar, as well as the unipolar group, life stressors more frequently preceded the first episode of affective disorder than the subsequent episodes. LIMITATIONS: The major limitation of this study is the retrospective approach, with e.g. difficulties to decide whether a life event plays a role in aetiology of affective disorder or is its consequence. CONCLUSIONS: Bipolar patients with high constitutional vulnerability have an earlier age of onset and need less stress factors to become ill. Better knowledge about the stress- and the vulnerability-factors in affective disorder might contribute to development of individually tailored therapeutic strategies in future.

Adult↗
PubMed2000

Patient satisfaction with the information provided at a psychiatric emergency unit.

OBJECTIVE: Evaluation of patient satisfaction with information at a psychiatric emergency unit. DESIGN: Patient survey. SETTING: Psychiatric patients assessed information provided by staff on illness, symptoms, treatment alternatives, treatment design, medication, time schedule for treatment and the expected therapeutic response. PARTICIPANTS: The sample included 100 subjects (63% response rate). OUTCOME MEASURE: Patient satisfaction. RESULTS: 59% were women. Mean age was 43 years. 87% were Swedish. 30% had psychotic, 35% bipolar and 35% anxiety disorders. 87% were admitted voluntarily. Almost 80% were satisfied with the patient-staff relationship. Questions on information, except medication, scored low. Patients with non-psychotic disorder were more satisfied with information on symptoms, treatment alternatives and treatment design, and voluntary patients with information about medication. Patients born in Sweden and voluntary patients awarded influence on treatment planning higher scores. CONCLUSIONS: Psychiatric patients requiring emergency care did understand information. The staff provided satisfactory information only when knowledgeable.

Adult↗
PubMed2000

Sertraline versus paroxetine in major depression: clinical outcome after six months of continuous therapy.

reuptake inhibitors (SSRIs) during continuation therapy. This investigation reports the differential effect of 6 months of treatment with sertraline versus paroxetine for symptoms of depression, quality of life, and personality outcomes. Outpatients with unipolar major depression (DSM-III-R) were randomly assigned to receive 24 weeks of double-blind treatment with flexible doses of paroxetine (20-40 mg) or sertraline (50-150 mg). Assessments included the Montgomery-Asberg Depression Rating Scale (MADRS), the Clinical Global Impression Scale, the Battelle Quality of Life Questionnaire, and the Structured Clinical Interview for DSM-III-R Personality Disorders screen questionnaire. One hundred seventy-six patients (mean age, 43 years; 64% female; baseline MADRS, 30.3) were treated with sertraline and 177 patients (mean age, 42 years; 71% female; MADRS, 30.7) with paroxetine. Antidepressant efficacy during continuation therapy was sustained, with only 2% of patients receiving sertraline and 9% of patients receiving paroxetine suffering a relapse. Continuation therapy resulted in a substantial conversion of responders during short-term treatment to full remission: remitter rates increased from 52% to 80% for sertraline and from 57% to 74% for paroxetine. The improvements in quality of life were related to a reduced depression score. SSRI treatment had significant beneficial effects on both categorical and dimensional measures of personality. A logistic regression analysis identified early response (25% reduction in MADRS scores at week 2) as the most important predictor of treatment response, whereas high severity, chronicity, and poor baseline quality of life had no effect. Both treatments were well-tolerated, with sertraline having a somewhat lower side effect profile. Sertraline and paroxetine demonstrated comparable efficacy during short-term and continuation therapy. Treatment was associated with significant improvement in quality of life and with reductions in axis II personality psychopathology.

Adolescent↗
PubMed2000

The effect of citalopram treatment on platelet serotonin function in panic disorders.

We investigated the effect of the selective serotonin reuptake inhibitor (SSRI) citalopram after 6-8 weeks and 6 months of treatment on clinical and peripheral indexes for central serotonergic function: platelet [14C]serotonin uptake and [3H]paroxetine- and [3H]LSD-binding to platelets membranes in 33 patients with panic disorder. Basal data from patients were compared with data from a control material consisting of 33 healthy volunteers. Bmax for platelet [3H]paroxetine binding was significantly lower in patients than in controls. There were no differences in serotonin uptake or [3H]LSD-binding between patients and controls. The degree of anxiety and depression was assessed using the Beck Anxiety Inventory (BAI) and Beck Depression Inventory self-assessment scales, and the Clinical Anxiety Scale and the Montgomery Asberg Depression Rating Scale for clinical evaluation. Complete remission was found in one third of the patients after 6-8 weeks and in two-thirds after 6 months of treatment. The reduction in assessment scores was parallelled with similar reductions in platelet 5-HT2-receptor density, [3H]LSD affinity variable (Kd) and Vmax for platelet [14C]5-HT uptake. Citalopram treatment did not alter Bmax and Kd for platelet [3H]paroxetine-binding. A positive correlation was found between Vmax for the platelet [14C]5-HT uptake and BAI after 6 months citalopram treatment. The present study shows that citalopram has a therapeutic effect in panic disorders. A prerequisite of responding to treatment might be plasticity in the serotonergic system.

Adult↗
PubMed1999

Platelet serotonin functions in untreated major depression.

The uptake of [14C]5-HT, [3H]paroxetine and [3H]LSD binding was determined in platelets from 30 untreated patients with major depression and compared with corresponding variables from 30 healthy age-, sex- and season-matched control subjects. The maximum velocity (Vmax) for the 5-HT uptake was significantly decreased in patients (P = 0.014) compared to control subjects. Depressed women had significantly lower Vmax than female control subjects. In men, Vmax did not differ between patients and control subjects. Vmax was significantly lower in male inpatients compared with male outpatients (P = 0.05). The density (Bmax) of 5-HT uptake sites was found to be significantly increased in patients (P < 0.05) compared to control subjects and male patients had significantly higher Bmax than male control subjects, but there was no difference between female control subjects and female patients. No significant difference was found in Bmax of 5-HT2-receptors between patients and control subjects. A positive correlation was found between Bmax of 5-HT2-uptake sites and the degree of anxiety and between Bmax of 5-HT2 receptors and MADRS scores. Bmax of 5-HT2-receptors was positively correlated with the degree of suicidality. The results in the present study indicate that there may be a gender difference in serotonergic dysfunction in depression.

Adult↗
PubMed1999

Fluoxetine inhibits the metabolism of tolterodine-pharmacokinetic implications and proposed clinical relevance.

AIMS: To investigate the change in disposition of tolterodine during coadministration of the potent cytochrome P450 2D6 (CYP2D6) inhibitor fluoxetine. METHODS: Thirteen patients received tolterodine l-tartrate 2 mg twice daily for 2.5 days, followed by fluoxetine 20 mg once daily for 3 weeks and then concomitant administration for an additional 2.5 days. They were characterized as extensive metabolizers (EM1 with one functional CYP2D6 gene, EM2 with two functional genes) or poor metabolizers (PM). RESULTS: Nine patients, three EM2 and four EM1 and two PM, completed the trial. Following tolterodine administration, the area under the serum concentration-time curve (AUC) of tolterodine was 4.4-times and 30-times higher among EM1 and PM, respectively, compared with EM2. The AUC of the 5-hydroxymethyl metabolite (5-HM) was not quantifiable in PM. Fluoxetine significantly decreased (P<0.002) the oral clearance of tolterodine by 93% in EM2 and by 80% in EM1. The AUC of 5-HM increased in EM2 and decreased in EM1. However, the exposure to the active moiety (unbound tolterodine +5-HM) was not significantly increased in the two phenotypes. The subdivision of the EM group showed a 2.1-fold increase in active moiety in EM2 but the exposure was still similar to EM1 compared with before the interaction. CONCLUSIONS: The study suggests a difference in the pharmacokinetics of tolterodine and its 5-hydroxymethyl metabolite depending on the number of functional CYP2D6 genes. Fluoxetine significantly inhibited the hydroxylation of tolterodine. Despite the effect on the pharmacokinetics of tolterodine in extensive metabolizers, the clinical effect is expected to be within normal variation.

Benzhydryl Compounds↗
PubMed1998

Platelet serotonergic functions and light therapy in seasonal affective disorder.

We investigated platelet 14C-serotonin uptake and platelet [3H]LSD and [3H]paroxetine binding in 11 patients with seasonal affective disorder (SAD). Patients were reinvestigated after light therapy, applied at 07.00-09.00 h for 10 consecutive days. The degree of depression was rated before and after light therapy using the Comprehensive Psychopathological Rating Scale (CPRS). Baseline data in patients were compared with data from a control group consisting of 11 age- and sex-matched healthy volunteers. Seven patients responded to light therapy with a > 50% reduction in CPRS scores. In non-responders, the reduction in CPRS was 24.7 +/- 5.5%. There was a significant inverse correlation (P = 0.014) between Km for platelet 14C-serotonin uptake and CPRS scores. Patients had significantly higher Bmax for platelet [3H]LSD binding (P = 0.04) and significantly lower Bmax for platelet [3H]paroxetine binding (P = 0.016). There was a strong, multiple correlation between Bmax for [3H]LSD, as the dependent variable, and Km, Vmax and Bmax for [3H]paroxetine binding in patients (P < 0.0001) but not in controls. Responders to light therapy had significantly higher Km (P = 0.023) and significantly lower Bmax for [3H]paroxetine binding (P = 0.028) than non-responders. Bmax for [3H]paroxetine binding increased significantly to normal levels after light therapy. The results indicate that SAD is associated with aberrations in the serotonin uptake mechanism. The enhanced 5-HT2-receptor density may reflect a consequential up-regulation.

Adult↗
PubMed1998

Serotonergic 'vulnerability' in affective disorder: a study of the tryptophan depletion test and relationships between peripheral and central serotonin indexes in citalopram-responders.

A double-blind study of the tryptophan depletion (TD) challenge was performed on a sample consisting of 20 patients with a major depressive disorder in clinical remission after citalopram treatment. TD was induced by the intake of 43 g of an amino acid mixture containing the five large neutral amino acids. The control group received the same mixture, to which 2.3 g tryptophan had been added. Five of the 12 challenged patients showed a worsening of depressive symptoms during the day of the test. In contrast, there was no mood alteration in the eight control patients. Baseline cortisol levels were significantly higher in responders to TD compared to those in non-responders and controls. Platelet serotonin-receptor function and plasma prolactin levels were correlated. There was a significant positive correlation in the baseline data between rated mood state and plasma cortisol and a significant inverse correlation between related mood state and plasma tryptophan concentration. Thus low mood appeared to be associated with low serotonin precursor availability as well as with high cortisol levels.

Adult↗
PubMed1998

Increased platelet 5-HT2 receptor binding after electroconvulsive therapy in depression.

We investigated the effect of electroconvulsive treatment (ECT) on platelet 14C-serotonin uptake, 3H-paroxetine binding and 5-HT2 receptors in 12 patients (10 women and 2 men) unresponsive to pharmacological treatment. The mean numbers of ECTs given was 6.1 +/- 1.5. Mean treatment days was 14.6 +/- 3.8. Mean percent reduction in MADRS scores was 80.7 +/- 19.7 (p < 0.002). The number of 5-HT2 receptors increased significantly and uniformly after ECT (p = 0.011). There was no correlation between the degree of increase in 5-HT2 receptor densities and the reduction in MADRS scores after ECT. There was no difference in mean Bmax for platelet 3H-paroxetine binding before and after ECT. Bmax increased in six patients and decreased in six patients. The study shows an increase in platelet 5-HT2-receptor densities in depression after repeated ECT. Recognizing the similarities between 5-HT2 receptors in platelets and cerebral cortex, it seems reasonable to assume that a similar upregulation of cortical 5-HT2 receptors occurs after ECT.

Adult↗
PubMed1997

Impaired neuropsychological performance in euthymic patients with recurring mood disorders.

BACKGROUND: Both patients suffering from schizophrenia and patients suffering from recurring mood disorder show cognitive impairments as established by a variety of neuropsychological tests. The aim of the present study was to investigate the neuropsychological performance of euthymic patients who had recurring mood disorder and the possible relationship between episodes of hospitalization and cognitive impairments. METHOD: Twenty-six euthymic patients with a DSM-III-R recurring mood disorder diagnosis were investigated by using the Synonym Reasoning and Block-Test Battery and a part of the Halstead-Reitan Test Battery. RESULTS: An overall lowered performance in the test results was found. There was a significant positive relationship between four different tests and the number of hospitalization episodes; the patients with impaired cognitive functioning had significantly more hospitalization episodes than patients with normal cognitive functioning. CONCLUSION: The results suggest that a subgroup of patients with recurring mood disorder are defined by more relapses and episodes of hospitalization and show cognitive dysfunctions even when euthymic.

Adult↗
PubMed1996

The CYP2D6 genotype predicts the oral clearance of the neuroleptic agents perphenazine and zuclopenthixol.

BACKGROUND: Most antidepressant and neuroleptic agents are metabolized by the polymorphic cytochrome P450 enzyme CYP2D6. This study evaluates the importance of the CYP2D6 genotype for the disposition of the neuroleptic agents perphenazine and zuclopenthixol. METHODS: Patients treated with neuroleptic agents (n = 36) were studied prospectively with regard to CYP2D6 genotype and neuroleptic plasma concentration during oral treatment. Because no patient provided enough samples for individual kinetic modeling, a bayesian approach was used for determination of the clearance. Population kinetic parameters for this procedure were collected from retrospective therapeutic drug monitoring data (n = 113) by use of a nonparametric approach. RESULTS: The CYP2D6 genotype significantly predicted the oral clearance of perphenazine and zuclopenthixol (p < 0.01 by multiple regression). The difference in clearance between homozygous extensive metabolizers and poor metabolizers was threefold for perphenazine and twofold for zuclopenthixol. CONCLUSION: The results show that the genotype for CYP2D6 is closely related to the oral clearances of perphenazine and zuclopenthixol. If this finding can be confirmed in a larger population, genotyping may become an important tool for the dosing of these two neuroleptic agents.

Administration, Oral↗
PubMed1995

Attempted suicide predicts suicide risk in mood disorders.

Suicide risk was studied in a sample of 346 mood disorder inpatients, 92 of whom were admitted after a current suicide attempt. The overall suicide mortality after a mean observation period of 6 years was 8%. The potential of attempted suicide to predict suicide risk in hospitalized patients with mood disorders was studied by survival analysis after subgrouping on the basis of whether a current suicide attempt had occurred or not. The suicide risk the first year after attempting suicide was 12% (11/92), compared with 2% (4/254) in the mood disorder subgroup with no current suicide attempt. The long-range suicide risk after a current suicide attempt in depression was 15% (14/92) as compared with 5% (13/254) among those without a current suicide attempt. It is concluded that a current suicide attempt in mood disorder inpatients predicts suicide risk particularly within the first year and should be taken very seriously.

Adult↗
PubMed1995

Two-year outcome of team-based intensive case management for patients with schizophrenia.

OBJECTIVES: Two-year outcomes of patients with schizophrenic disorders who were assigned to an intensive, team-based case management program and patients who received standard psychiatric services were assessed. The case management model featured increased staff contact time with patients, rehabilitation plans based on patients' expressed needs, and patients' attendance at team meetings where their rehabilitation plan was discussed. METHODS: Forty patients were randomly assigned to either the case management group or the control group that received standard services. Patients' use of emergency and inpatient services, their quality of life, the size of their social networks, and their relatives' burden of care were assessed at assignment to the study groups and at two-year follow-up. RESULTS: Patients in the case management group had significantly fewer emergency visits compared with the two years before the study, and their relatives reported significantly reduced burden of care associated with relationships with psychiatric services over the two-year period. The size of patients' social networks increased for the case management group and decreased for the control group. CONCLUSIONS: A team-based intensive case management model is an effective intervention in the rehabilitation of patients with chronic schizophrenia.

Adult↗