IBZM SPECT imaging of striatal dopamine-2 receptors in psychotic patients treated with the novel antipsychotic substance quetiapine in comparison to clozapine and haloperidol

We investigated the striatal dopamine-2 (D2) receptor occupancy caused by different antipsychotic substances in 18 psychotic patients (16 with schizophrenic and two with schizoaffective disorder according to DSM-IV) with single photon emission computed tomography (SPECT) using 123I-iodobenzamide (IB...

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Veröffentlicht in:Psychopharmacologia 1997-10, Vol.133 (4), p.323-328
Hauptverfasser: KÜFFERLE, B, TAUSCHER, J, ASENBAUM, S, VESELY, C, PODREKA, I, BRÜCKE, T, KASPER, S
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container_issue 4
container_start_page 323
container_title Psychopharmacologia
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creator KÜFFERLE, B
TAUSCHER, J
ASENBAUM, S
VESELY, C
PODREKA, I
BRÜCKE, T
KASPER, S
description We investigated the striatal dopamine-2 (D2) receptor occupancy caused by different antipsychotic substances in 18 psychotic patients (16 with schizophrenic and two with schizoaffective disorder according to DSM-IV) with single photon emission computed tomography (SPECT) using 123I-iodobenzamide (IBZM) as tracer substance. Four patients were treated with the novel antipsychotic compound quetiapine (300-700 mg/day), six with clozapine (300-600 mg/ day) and eight with haloperidol (10-20 mg/day). They were compared with eight healthy controls. Measurement of S/F ratios and consecutive calculation of D2 receptor occupancy revealed a significantly lower striatal D2 occupancy rate with quetiapine and clozapine in comparison to haloperidol. In correspondence with the low striatal D2 receptor occupancy rates and again in contrast to the haloperidol treatment group, there were no extrapyramidal motor side-effects (EPS) in the quetiapine and clozapine treatment groups. Therefore, the reported data support the position that quetiapine can be considered to be an atypical antipsychotic substance due to its relatively weak striatal D2 receptor blocking property and therefore its low propensity to induce EPS.
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Four patients were treated with the novel antipsychotic compound quetiapine (300-700 mg/day), six with clozapine (300-600 mg/ day) and eight with haloperidol (10-20 mg/day). They were compared with eight healthy controls. Measurement of S/F ratios and consecutive calculation of D2 receptor occupancy revealed a significantly lower striatal D2 occupancy rate with quetiapine and clozapine in comparison to haloperidol. In correspondence with the low striatal D2 receptor occupancy rates and again in contrast to the haloperidol treatment group, there were no extrapyramidal motor side-effects (EPS) in the quetiapine and clozapine treatment groups. 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Four patients were treated with the novel antipsychotic compound quetiapine (300-700 mg/day), six with clozapine (300-600 mg/ day) and eight with haloperidol (10-20 mg/day). They were compared with eight healthy controls. Measurement of S/F ratios and consecutive calculation of D2 receptor occupancy revealed a significantly lower striatal D2 occupancy rate with quetiapine and clozapine in comparison to haloperidol. In correspondence with the low striatal D2 receptor occupancy rates and again in contrast to the haloperidol treatment group, there were no extrapyramidal motor side-effects (EPS) in the quetiapine and clozapine treatment groups. Therefore, the reported data support the position that quetiapine can be considered to be an atypical antipsychotic substance due to its relatively weak striatal D2 receptor blocking property and therefore its low propensity to induce EPS.</abstract><cop>Berlin</cop><pub>Springer</pub><pmid>9372530</pmid><doi>10.1007/s002130050409</doi><tpages>6</tpages></addata></record>
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subjects Adult
Antipsychotic Agents - pharmacokinetics
Antipsychotic Agents - therapeutic use
Antipsychotics
Benzamides
Biological and medical sciences
Clozapine
Clozapine - pharmacokinetics
Clozapine - therapeutic use
Computed tomography
Dibenzothiazepines - pharmacokinetics
Dibenzothiazepines - therapeutic use
Dopamine
Dopamine Antagonists - pharmacokinetics
Dopamine Antagonists - therapeutic use
Dopamine D2 receptors
Extrapyramidal system
Female
Haloperidol
Haloperidol - pharmacokinetics
Haloperidol - therapeutic use
Humans
Male
Medical sciences
Middle Aged
Neostriatum
Neostriatum - anatomy & histology
Neostriatum - metabolism
Neuropharmacology
Pharmacology. Drug treatments
Psycholeptics: tranquillizer, neuroleptic
Psychology. Psychoanalysis. Psychiatry
Psychopharmacology
Psychosis
Psychotic Disorders - drug therapy
Psychotic Disorders - metabolism
Psychotropic drugs
Pyrrolidines
Quetiapine
Quetiapine Fumarate
Receptors, Dopamine D2 - metabolism
Schizophrenia - drug therapy
Schizophrenia - metabolism
Single photon emission computed tomography
Tomography, Emission-Computed, Single-Photon
title IBZM SPECT imaging of striatal dopamine-2 receptors in psychotic patients treated with the novel antipsychotic substance quetiapine in comparison to clozapine and haloperidol
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