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The Haem and Nitrite Study - The Effects of Haemoglobin NO-blockade on Nitrite-induced Forearm Vessel Dilatation

17. marts 2017 opdateret af: University of East Anglia

The Effects of Free Haemoglobin NO-blockade on Nitrite Forearm Vessel Dilatation Under Normoxia and Hypoxia in Healthy Volunteers

The study is a pharmacodynamic random order cross-over trial investigating the physiological effects of intra-arterial infusion of nitrite following a haemolysed autologous blood transfusion.

Studieoversigt

Status

Ukendt

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

This is a healthy volunteer study.

Following entry into this cross-over trial, participants will be randomized to undergo experiments under either normoxic followed by hypoxic conditions, or hypoxic followed by normoxic conditions.

Subjects will donate whole blood as an autologous unit at a preselected NHSBT donation site. The unit will transported back to the NNUH blood bank after a minimum of 30 days (maximum 35 days) after donation.

Volunteers will be tested for baseline bloods. Volunteers will be randomised to normoxia or hypoxia. The will then undergo a nitrite infusion, followed by an autologous whole blood transfusion and a second nitrite infusion (which will co-infuse at the end of the transfusion). During the protocol, the participants will undergo repeated FBFR measurements using strain-gauge plethysmography.

After a minimum of 12 weeks rest period after their initial donation, participants will cross-over to the opposite oxygen condition (as per initial randomization) and the above protocol will be repeated. All interventions will be performed by fully trained and competent medical staff.

Undersøgelsestype

Interventionel

Tilmelding (Forventet)

41

Fase

  • Fase 1

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

  • Det Forenede Kongerige
    • Norfolk
      • Norwich, Norfolk, Det Forenede Kongerige, NR4 7UQ
        • Rekruttering
        • University of East Anglia
        • Kontakt:

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 og ældre (Voksen, Ældre voksen)

Tager imod sunde frivillige

Ingen

Køn, der er berettiget til at studere

Alle

Beskrivelse

Inclusion Criteria:

  1. Male or female, aged greater than or equal to 18 years
  2. If between 18-20 years of age, calculate total blood volume should be more than >3.5L (http://www.blood.co.uk/giving-blood/who-can-give-blood/)
  3. Body weight > 50kg weight (8 stone 12lbs)
  4. Not known to have any significant past medical history and not having regular follow up (Check Donor Selection Guidelines (http://www.transfusionguidelines.org.uk/)
  5. Willing to provide blood donation and receive autologous blood transfusion
  6. After assessment for eligibility pass all blood donor eligibility criteria
  7. Able to provide informed consent
  8. Should inform overseas travel plan during study period (Check Geographical Disease Risk Index on http://www.transfusionguidelines.org.uk/dsg/gdri) e.g. unable to donate blood for 6 months if travel in a malaria endemic country. Similar guidelines for West Nile virus and T. Cruzi endemic countries.

Exclusion Criteria:

  1. Significant medical, surgical or psychiatric disease that in the opinion of the Clinical Research Fellow would affect subject safety or significantly impact his/her ability to comply with follow-up. This would include any known clotting disorders.
  2. Known allergy or intolerance to Nitrites
  3. Known glucose-6-phosphate dehydrogenase (G6PD) deficiency
  4. Female subjects must be of non-childbearing potential, defined as follows: postmenopausal females who have had at least 12 months of spontaneous amenorrhea or 6 months of spontaneous amenorrhoea with serum FSH>40mIU/ml or females who have had a hysterectomy, bilateral salpingectomy or bilateral oophorectomy at least 6 weeks prior to enrolment
  5. Receipt of an investigational drug or biological agent within the 4 weeks prior to study entry or 5 times the drug half-life, whichever is the longer
  6. Predisposed to acute on chronic limb ischemia evident from a history of claudication or known peripheral arterial disease.
  7. No past history of significant adverse events post blood donation

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Grundvidenskab
  • Tildeling: Randomiseret
  • Interventionel model: Crossover opgave
  • Maskning: Ingen (Åben etiket)

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Aktiv komparator: Normoxia and Nitrite (3umol/min-1)
Sodium nitrite stock solution: 100umol/10ml, prepared to concentration according to oxygen sequence. Normoxia (3umol/min-1).
Medicin: Natriumnitrit
Aktiv komparator: Hypoxia and Nitrite (1umol/min-1)
This will be repeated as per the normoxia cohort, but at a reduced dose of sodium nitrite (1umol/min-1 for 30 minutes) and the volunteers will be asked to breathe 12% oxygen/88% nitrogen for 1-5 minutes before Plethysmography is performed (to get the volunteer to an oxygen saturation of 83-88% peripherally).
Medicin: Natriumnitrit

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Tidsramme
Change in FBFR during intra-brachial nitrite and haemolysed blood co-infusion in normoxia vs hypoxia.
Tidsramme: Up to 18 months
Up to 18 months

Sekundære resultatmål

Resultatmål
Tidsramme
Change in FBFR during haemolysed blood infusion vs baseline
Tidsramme: Up to 18 months
Up to 18 months
Change in FBFR during nitrite infusion in normoxia vs nitrite infusion in hypoxia
Tidsramme: Up to 18 months
Up to 18 months
Change in FBFR during nitrite infusion in normoxia vs baseline
Tidsramme: Up to 18 months
Up to 18 months
Change in FBFR during nitrite infusion in hypoxia vs baseline
Tidsramme: Up to 18 months
Up to 18 months
Blood analysis (cell free haemoglobin, nitrate, nitrite and nitroso species levels)
Tidsramme: Up to 18 months
Up to 18 months

Samarbejdspartnere og efterforskere

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

Sponsor

University of East Anglia

Efterforskere

  • Ledende efterforsker: Michael P Frenneaux, FRCP, FESC, Dean of Medicine, Norwich Medical School, The University of East Anglia, UK

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)

1. december 2016

Primær færdiggørelse (Forventet)

1. marts 2018

Studieafslutning (Forventet)

1. marts 2018

Datoer for studieregistrering

Først indsendt

20. september 2016

Først indsendt, der opfyldte QC-kriterier

7. marts 2017

Først opslået (Faktiske)

13. marts 2017

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

20. marts 2017

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

17. marts 2017

Sidst verificeret

1. marts 2017

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • 206995

Plan for individuelle deltagerdata (IPD)

Planlægger du at dele individuelle deltagerdata (IPD)?

Ingen

Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .

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