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Ketamine's Effect Changes the Cortical Electrophysiological Activity Related to Semantic Affective Dimension of Pain

15. april 2019 opdateret af: Hospital de Clinicas de Porto Alegre

Ketamine's Effect Changes the Cortical Electrophysiological Activity Related to Semantic Affective Dimension of Pain: a Placebo-controlled Study in Healthy Male Subjects

This is a clinical trial that intend to determine the effects of S-ketamine on event-related potentials associated with semantic affective pain-processing

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

Ketamine is a unique anesthetic with neural effects that are distinct from more commonly-used γ-aminobutyric acid agonists. Evidence suggest that analgesic effect of ketamine is primarily related to the affective than the sensorial aspects of pain interpretation. The investigators investigated whether ketamine, a noncompetitive NMDA antagonist, would modify the perceived emotional valence of pain-related words when compared to non-pain-related ones in healthy volunteers. Using a single session double-blind parallel placebo-controlled design, 24 healthy volunteers were randomized to receive intravenous S-ketamine (n=12) or placebo (n=12). During infusion (plasmatic target of 60 ng/ml), the effects of ketamine were recorded using EEG and oddball behavioral data was monitored. Evoked potentials (N200 and P300 components) were recorded during performance of a semantic written word oddball task containing pain-related (targets) and non-pain-related words (standards). Expected results: The findings of this study can help in the understanding of neurophysiologic mechanisms involved in ketamine's effects both in psychiatric diseases as in the treatment of postoperative acute and chronic pain.

Undersøgelsestype

Interventionel

Tilmelding (Faktiske)

24

Fase

  • Fase 2
  • Fase 3

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 40 år (Voksen)

Tager imod sunde frivillige

Ja

Køn, der er berettiget til at studere

Han

Beskrivelse

Inclusion Criteria:

  • male healthy subjects with higher education level

Exclusion Criteria:

  • do not understand Portuguese language
  • obese patients (BMI > 27 kg/m2)
  • use of NSAID, steroids, analgesics, anticonvulsant drugs, as well as alpha and beta-blockers
  • score ≥ 13 on Beck II Questionnaire
  • sleep deprivation in the night before evaluation

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
Eksperimentel: Group S-Ketamine
S-Ketamine will be diluted in normal saline and administrated in a target controlled infusion using an infusion pump to obtain a plasma target of 60 ng/ml according to Domino's model. Infusion will start during the interval between the 3rd and 4th blocks of the task.
Medicin: Ketamine
S-ketamine will be administered in precalculated infusion rates to obtain a plasmatic level of 60 ng/ml
Placebo komparator: Group Placebo
A previously prepared identical solution containing only normal saline will be infused at the same infusion rates of group ketamine.
Medicin: Placebo
Administered in an identical way than ketamine.

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
AUC of the grand averaged mean differences between ERPs elicited by target and non-target words
Tidsramme: up to 60 min
EEG will be recorded during all task time. The main outcome will be the area under de curve (AUC) of the grand averaged mean differences between event-related potencials (ERPs) elicited by target and non-target words at 100-200, 300-500 and 800-900 ms after stimulus presentation for parietal electrophysiological signal (Pz). The ERPs represent the averaged voltage of several trials.
up to 60 min

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Word ratings related to the semantic valence
Tidsramme: up to 60 min
After viewing each word, volunteers were asked to classify them according to the semantic valence in the following categories: "positive," "negative" or "neutral."
up to 60 min
Response times (behavioural oddball data)
Tidsramme: up to 60 min
Response times to word classification in oddball task
up to 60 min

Andre resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Subjective euphoria rating
Tidsramme: up to 60 min
Euphoria will be rated using an analogue visual scale ranging of 0 to 10.
up to 60 min
Subjective sedation rating
Tidsramme: up to 60 min
Sedation will be rated using an analogue visual scale ranging of 0 (completely awake) to 100 (sleeping).
up to 60 min

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Hospital de Clinicas de Porto Alegre

Efterforskere

  • Ledende efterforsker: Wolnei Caumo, MD, PhD, Hospital de Clinicas de Porto Alegre

Publikationer og nyttige links

Den person, der er ansvarlig for at indtaste oplysninger om undersøgelsen, leverer frivilligt disse publikationer. Disse kan handle om alt relateret til undersøgelsen.

Generelle publikationer

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 (Faktiske)

2. januar 2017

Primær færdiggørelse (Faktiske)

30. november 2017

Studieafslutning (Faktiske)

30. november 2017

Datoer for studieregistrering

Først indsendt

12. april 2019

Først indsendt, der opfyldte QC-kriterier

15. april 2019

Først opslået (Faktiske)

16. april 2019

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

16. april 2019

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

15. april 2019

Sidst verificeret

1. januar 2018

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • 15-0019

Plan for individuelle deltagerdata (IPD)

Planlægger du at dele individuelle deltagerdata (IPD)?

UBESLUTET

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

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