Effect of Single Dose Intranasal Insulin On Cognitive Function
12. februar 2013 opdateret af: Xiaoduo Fan, University of Massachusetts, Worcester
Effect of Single Dose Intranasal Insulin on Cognitive Function in Patients With Schizophrenia
The purpose of the study is to find out how a small dose of insulin might affect memory, the ability to concentrate, and improve your daily functioning in patients with schizophrenia and schizoaffective disorders. Insulin is not being used to treat diabetes in this study. The investigators propose a single dose, double-blinded, placebo-controlled trial of intranasal insulin in 40 subjects with schizophrenia or schizoaffective disorder to examine insulin's effect on cognition. The specific aims include:
- Examine the effects of single doses of 40 IU intranasal insulin compared to placebo on cognitive functioning, including attention and memory.
- Examine whether single dose of intranasal insulin administration will raise serum insulin level and decrease plasma glucose level
Insulin will be delivered through an air spray pump into your nose. The investigators will be comparing one dose of insulin (40 International Units) with placebo, an inactive liquid.
Studieoversigt
Status
Afsluttet
Betingelser
Intervention / Behandling
Detaljeret beskrivelse
Insulin signaling in the brain is associated with improved cognitive function in both animal and human studies.
Intranasal administration of insulin, which is non-invasive and minimizes the risk of hypoglycemia, may represent a new intervention approach with the potential to improve cognition and real life functioning in this patient with schizophrenia.
Undersøgelsestype
Interventionel
Tilmelding (Faktiske)
30
Fase
- Fase 4
Kontakter og lokationer
Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.
Studiesteder
-
-
Massachusetts
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Boston, Massachusetts, Forenede Stater, 02114
- Freedom Trail Clinic
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-
Deltagelseskriterier
Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.
Berettigelseskriterier
Aldre berettiget til at studere
18 år til 65 år (Voksen, Ældre voksen)
Tager imod sunde frivillige
Ja
Køn, der er berettiget til at studere
Alle
Beskrivelse
Inclusion Criteria:
- Age 18-65 years
- Diagnosis of schizophrenia, any subtype or schizoaffective disorder, any subtype
- Male or female
- Stable dose of the current antipsychotic drug for at least one month
- Well established compliance with out-patient treatment per treating clinician's judgement.
- Able to complete the cognitive assessment battery (must be English speaking)
Exclusion Criteria:
- Inability to provide informed consent
- Current substance abuse
- On clozapine or olanzapine
- Psychiatrically unstable per treating clinician's judgement.
- Significant medical illnesses including uncontrolled hypertension, diabetes, seizure disorder, severe cardiovascular, cerebrovascular, pulmonary, or thyroid diseases etc.
- Incapable to complete the cognitive battery assessment.
Studieplan
Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
- Primært formål: Behandling
- Tildeling: Randomiseret
- Interventionel model: Parallel tildeling
- Maskning: Tredobbelt
Våben og indgreb
Deltagergruppe / Arm |
Intervention / Behandling |
|---|---|
|
Placebo komparator: Placebo (1)
Subjects are given a one-time, single dose of placebo intranasal spray
|
Placebo
|
|
Eksperimentel: Single-Dose Intranasal Insulin
Subjects are given a one-time, single dose of intranasal insulin
|
40 IU Intranasal Insulin will be administered once
Andre navne:
|
Hvad måler undersøgelsen?
Primære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
|---|---|---|
|
Improvement in Cognitive Function- HVLT Immediate Recall Total (Number)
Tidsramme: pretreatment= in the morning; postreatment= in the afternoon, 30 minutes after intranasal spray administration
|
Subjects performed the HVLT Immediate Recall Task.
For this task, participants were read aloud a list of 12 words from three taxonomic categories.
Participants were read the list three separate times, and after each reading were immediately asked to recall as many words from the list as they could.
The number of words recalled successfully was measured before and after intranasal treatment.
Values below represent posttreatment performance minus pretreatment performance.
|
pretreatment= in the morning; postreatment= in the afternoon, 30 minutes after intranasal spray administration
|
|
Improvement in Cognitive Function- HVLT-Delayed Recall (Number)
Tidsramme: pretreatment= in the morning; postreatment= in the afternoon, 30 minutes after intranasal spray administration
|
Subjects performed the HVLT word recall task after a 20-minute delay before and after intranasal treatment.
In the HVLT delayed recall task, participants were asked to recall the same list of 12 words dictated in the immediate recall task 20 minutes after the completion of the immediate recall task.
Words successfully recalled after the 20-minute delay were measured.
Values below represent posttreatment performance minus pretreatment performance.
|
pretreatment= in the morning; postreatment= in the afternoon, 30 minutes after intranasal spray administration
|
|
CPT d Score
Tidsramme: pretreatment= in the morning; postreatment= in the afternoon, 30 minutes after intranasal spray administration
|
Subjects performed a computer-based test designed to measure sustained attention (attention to a specific stimuli over a period of several minutes) before and after intranasal treatment.
During this test, participants respond as quickly as possible to any consecutive presentation of identical stimuli on the computer screen.
The stimuli (2, 3, and 4-digit targets) were presented with increasing cognitive load in successive blocks.
Correct responses, responses made to the second of 2 identical stimuli presented in a row, were scored as hits.
False alarms were also recorded.
The "d prime score" is a score given to each participant on a scale of 0.0- 1.0 in which discrimination sensitivity is measured.
A score of zero equates to no sensitivity, whereas a score of 1.0 equates to perfect sensitivity.
Values below represent postreatment performance minus pretreatment performance.
|
pretreatment= in the morning; postreatment= in the afternoon, 30 minutes after intranasal spray administration
|
|
Improvement in Cognitive Function- CPT Hits Rate (Proportion)
Tidsramme: pretreatment= in the morning; postreatment= in the afternoon, 30 minutes after intranasal spray administration
|
Subjects performed a computer-based test designed to measure sustained attention before and after intranasal treatment.
The task is described in the previous outcome measure ("CPT d score").
Hits rate refers to each participant's ability to correctly respond to two consecutive target presentations (i.e.
correct responses).
Hits rate was measured as a proportion of overall attempts (0= no hits, 1.0= 100% accuracy on hits).
Values below represent posttreatment performance minus pretreatment performance.
|
pretreatment= in the morning; postreatment= in the afternoon, 30 minutes after intranasal spray administration
|
|
Improvement in Cognitive Function- CPT Reaction Time of Hits (Milliseconds)
Tidsramme: pretreatment= in the morning; postreatment= in the afternoon, 30 minutes after intranasal spray administration
|
Subjects performed a computer-based test designed to measure sustained attention before and after intranasal treatment.
The task is described in detail in a previous outcome measure ("CPT d score").
Reaction time of hits refers to the average time each participant took to correctly respond to a stimuli in milliseconds.
Values below represent posttreatment performance minus pretreatment performance.
|
pretreatment= in the morning; postreatment= in the afternoon, 30 minutes after intranasal spray administration
|
|
Improvement in Cognitive Function- CPT False Alarm Rate (Proportion)
Tidsramme: pretreatment= in the morning; postreatment= in the afternoon, 30 minutes after intranasal spray administration
|
Subjects performed a computer-based test designed to measure sustained attention before and after intranasal treatment.
The task is described in detail in a previous outcome measure ("CPT d score").
False alarm rate refers to the proportion of overall attempts that were characterized as incorrect responses (responses to two non-identical targets).
Values below represent posttreatment performance minus pretreatment performance.
|
pretreatment= in the morning; postreatment= in the afternoon, 30 minutes after intranasal spray administration
|
Samarbejdspartnere og efterforskere
Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.
Efterforskere
- Ledende efterforsker: Xiaoduo Fan, MD, MPH, MS, UMass Medical School
Datoer for undersøgelser
Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.
Studer store datoer
Studiestart
1. oktober 2006
Primær færdiggørelse (Faktiske)
1. januar 2010
Studieafslutning (Faktiske)
1. januar 2010
Datoer for studieregistrering
Først indsendt
31. januar 2008
Først indsendt, der opfyldte QC-kriterier
27. marts 2008
Først opslået (Skøn)
28. marts 2008
Opdateringer af undersøgelsesjournaler
Sidste opdatering sendt (Skøn)
15. februar 2013
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
12. februar 2013
Sidst verificeret
1. februar 2013
Mere information
Begreber relateret til denne undersøgelse
Nøgleord
Yderligere relevante MeSH-vilkår
Andre undersøgelses-id-numre
- 4-2006
- CORRC tracking number: 4-2006
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