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Does Perineural Dexmedetomidine Prolong Duration of a Nerve Block?

4. januar 2016 oppdatert av: Jakob Hessel Andersen, Zealand University Hospital

Does Perineural Dexmedetomidine Prolong the Duration of an Adductor Canal Block When Controlling for a Systemic Effect? - A Randomised Paired Trial in Healthy Volunteers.

Brief Summary: The aim of this trial is to investigate if dexmedetomidine prolongs the duration of an adductor canal block. By using healthy volunteers the investigators can perform a bilateral adductor canal block and thereby control for a systemic effect to clarify if the effect is actually peripheral or systemic. The investigators hypothesis is that dexmedetomidine as an adjunct to a local anaesthetic prolongs the duration of a peripheral nerve block by a peripheral mechanism.

Studieoversikt

Status

Fullført

Forhold

Intervensjon / Behandling

Detaljert beskrivelse

Background:

Efficient pain management promoting mobilization and convalescence is essential in an ideal perioperative course. Regional nerve blocks are a central element in postoperative regimes for many patients and it is therefore important that these nerve blocks are both long lasting and efficient. This trial will investigate whether it is possible to optimize the postoperative pain management when adding dexmedetomidine to the local anaesthetic ropivacaine in peripheral nerve blocks.

The prolonging effect of using dexmedetomidine as adjunct in peripheral nerve blocks have been investigated in several studies. However, it remains uncertain whether the effect is mediated by a systemic-, a peripheral- or a combined systemic/peripheral mechanism. In this trial the adjuvating effect of dexmedetomidine will be investigated using the adductor canal block. This is a nerve block that besides being efficient as pain treatment after knee surgery, is primarily sensory, and therefore augments mobilization after total knee arthroplasty.

Method:

On the trial day the volunteers will receive bilateral adductor canal blocks. In one thigh they will receive the local anaesthetic ropivacaine 20ml 5mg/ml and placebo (saline) and in the other thigh ropivacaine 20ml 5mg/ml and dexmedetomidine 100μg. The allocation is blinded to volunteer and investigator.

The duration of the nerve block will be measured by five different tests: Temperature test, Pinprick, Pain during tonic heat stimulation, Warmth detection threshold and pain detection threshold. All tests are validated within pain research.

Studietype

Intervensjonell

Registrering (Faktiske)

21

Fase

  • Fase 2

Kontakter og plasseringer

Denne delen inneholder kontaktinformasjon for de som utfører studien, og informasjon om hvor denne studien blir utført.

Studiesteder

  • Danmark
      • Koege, Danmark, 4600
        • Department of Anesthesiology Koege Hospital

Deltakelseskriterier

Forskere ser etter personer som passer til en bestemt beskrivelse, kalt kvalifikasjonskriterier. Noen eksempler på disse kriteriene er en persons generelle helsetilstand eller tidligere behandlinger.

Kvalifikasjonskriterier

Alder som er kvalifisert for studier

18 år til 65 år (Voksen, Eldre voksen)

Tar imot friske frivillige

Ja

Kjønn som er kvalifisert for studier

Mann

Beskrivelse

Inclusion Criteria:

  • American Society of Anesthesiologists class 1
  • Body Mass Index 18-30

Exclusion Criteria:

  • Allergy to study medication
  • Earlier trauma or surgery to lower limb
  • Diabetes Mellitus
  • Alcohol or drug abuse
  • Daily intake of opioids or steroids last 4 weeks
  • Daily intake of any analgesics last 48 hours Heart block Sick sinus node.

Studieplan

Denne delen gir detaljer om studieplanen, inkludert hvordan studien er utformet og hva studien måler.

Hvordan er studiet utformet?

Designdetaljer

  • Primært formål: Behandling
  • Tildeling: Randomisert
  • Intervensjonsmodell: Parallell tildeling
  • Masking: Firemannsrom

Våpen og intervensjoner

Deltakergruppe / Arm
Intervensjon / Behandling
Eksperimentell: Ropivacaine + Dexmedetomidine
Adductor Canal Block 20 ml Ropivacaine 5mg/ml + 1 ml Dexmedetomidine 100ug/ml
Legemiddel: Dexmedetomidine
100 ug dexmedetomidine added to the ropivacaine nerveblock
Andre navn:
  • Dexdor
Legemiddel: Ropivacaine
20 ml Ropivacaine 5mg/ml
Placebo komparator: Ropivacaine + Placebo
Adductor Canal Block 20 ml Ropivacaine 5mg/ml + 1 ml Saline
Legemiddel: Ropivacaine
20 ml Ropivacaine 5mg/ml
Legemiddel: Isotonic Saline
Placebo

Hva måler studien?

Primære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Difference in duration of sensory block between dexmedetomidine and placebo assessed as cold sensation with an alcohol swab
Tidsramme: 0-36 hours
Duration is defined as time from block performance until recovery of cold sensation to an alcohol swab, assessed every hour post-block (and every half hour when pain scores during the tonic heat stimulation test is above 0) Time for sleep will be provided.
0-36 hours

Sekundære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Difference between dexmedetomidine and placebo in the duration of a sensory block assessed by pin-prick
Tidsramme: 0-36 hours
Duration is defined as time from block performance until recovery of normal sensation, assessed on the hour post block Time for sleep will be provided.
0-36 hours
Difference between dexmedetomidine and placebo in the duration of a sensory block assessed as maximum pain during a tonic heat stimulation test
Tidsramme: 0-36 hours
Duration is defined as time from block performance until recovery of normal sensation, assessed on the hour post block.Time for sleep will be provided. Recovery of normal sensation is defined as VAS pain scores ± 10 mm of the pre-block value. A Linear 100mm visual analogue scale (VAS) will be used.
0-36 hours
Difference between dexmedetomidine and placebo in the duration of a sensory block assessed as warmth detection threshold
Tidsramme: 0-36 hours
Duration is defined as time from block performance until recovery of normal sensation, assessed on the hour post block Time for sleep will be provided. Recovery of normal sensation is defined as detection thresholds of ± 2 degrees C of the pre-block value. Time for sleep will be provided
0-36 hours
Difference between dexmedetomidine and placebo in the duration of a sensory block assessed as heat pain detection threshold
Tidsramme: 0-36 hours
Duration is defined as time from block performance until recovery of normal sensation, assessed on the hour post block. Time for sleep will be provided. Recovery of normal sensation is defined as detection thresholds of ± 2 degrees C of the pre-block value.
0-36 hours
Difference in maximum pain scores between dexmedetomidine and placebo during block and after recovery of normal sensation.
Tidsramme: 0-36 hours
Pain scores during a tonic heat stimulation will be compared every hour post block and 1 h after pain scores have returned to the pre-block values. Time for sleep will be provided.
0-36 hours

Samarbeidspartnere og etterforskere

Det er her du vil finne personer og organisasjoner som er involvert i denne studien.

Sponsor

Zealand University Hospital

Etterforskere

  • Hovedetterforsker: Jakob H Andersen, MD, Department of Anesthesiology Koege Hospital

Studierekorddatoer

Disse datoene sporer fremdriften for innsending av studieposter og sammendragsresultater til ClinicalTrials.gov. Studieposter og rapporterte resultater gjennomgås av National Library of Medicine (NLM) for å sikre at de oppfyller spesifikke kvalitetskontrollstandarder før de legges ut på det offentlige nettstedet.

Studer hoveddatoer

Studiestart

1. august 2015

Primær fullføring (Faktiske)

1. september 2015

Studiet fullført (Faktiske)

1. september 2015

Datoer for studieregistrering

Først innsendt

30. juni 2015

Først innsendt som oppfylte QC-kriteriene

30. juni 2015

Først lagt ut (Anslag)

2. juli 2015

Oppdateringer av studieposter

Sist oppdatering lagt ut (Anslag)

5. januar 2016

Siste oppdatering sendt inn som oppfylte QC-kriteriene

4. januar 2016

Sist bekreftet

1. august 2015

Mer informasjon

Begreper knyttet til denne studien

Nøkkelord

Ytterligere relevante MeSH-vilkår

Andre studie-ID-numre

  • SM2-JH-14
  • 2014-005651-89 (EudraCT-nummer)

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