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Combustion Derived Air Pollution and Vascular Function

16. oktober 2008 opdateret af: University of Edinburgh

The Effects of Combustion-Derived Air Pollution on Vascular Vasomotor and Fibrinolytic Function in Healthy Volunteers (Diesel Exposure)

Air pollution is a major cause of cardiovascular morbidity and mortality. The components of air pollution responsible and the mechanisms through which they might mediate these harmful effects remain only partially understood. The link between cardiovascular disease and air pollution is strongest for fine particulate matter. Fine particulate matter (PM) is produced from the combustion of fossil fuels with the most significant threat thought to be posed by small particles less than 10µm (PM 10) which can be inhaled into the lungs. We propose to identify the precise component of diesel exhaust that mediates the adverse cardiovascular effects using a carbon particle generator, and a particle concentrator. The aim of this study proposal is to assess the vascular effects of different types and components of air pollution in healthy subjects. We intend to test the hypotheses that:

  1. Combustion derived nanoparticulate causes an acute impairment of endothelial vasomotor and fibrinolytic function in healthy volunteers.
  2. Exposure to combustion derived air pollution is associated with increased thrombus formation.

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Undersøgelsestype

Interventionel

Tilmelding (Faktiske)

16

Fase

  • Ikke anvendelig

Kontakter og lokationer

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

Studiesteder

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

  • Barn
  • Voksen
  • Ældre voksen

Tager imod sunde frivillige

Ja

Køn, der er berettiget til at studere

Alle

Beskrivelse

Inclusion Criteria:

  • Healthy volunteers

Exclusion Criteria:

  • Current smokers
  • Significant occupational exposure to air pollution
  • History of lung disease
  • Women of child-bearing potential
  • Malignant arrhythmias
  • Renal or hepatic failure
  • Significant co-morbidity
  • Systolic blood pressure >190 or <100 mmHg
  • Previous history of blood dyscrasia
  • Unable to tolerate the supine position
  • Lack of informed consent
  • Blood donation within last 3 months

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: Tredobbelt

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Eksperimentel: Filtered Air Exposure
1 hour exposure to filtered air during intermittent exercise
Procedure: Forearm Vascular Study
Forearm venous occlusion plethysmography to measure forearm blood flow during intra-arterial infusion of the vasodilators Verapamil (10-100 µg/min), bradykinin (100-1000 pmol/min), sodium nitroprusside (2-8 µg/min) and Acetylcholine (5-20 mg/min).
Andre navne:
  • BK
  • SNP
  • ACh
Procedure: Badimon Chamber
Ex-vivo assessment of thrombus formation using Badimon Chamber
Eksperimentel: Diesel Exhaust Exposure
1 hour exposure to dilute diesel exhaust at a concentration of 300 µg/m3 during intermittent exercise
Procedure: Forearm Vascular Study
Forearm venous occlusion plethysmography to measure forearm blood flow during intra-arterial infusion of the vasodilators Verapamil (10-100 µg/min), bradykinin (100-1000 pmol/min), sodium nitroprusside (2-8 µg/min) and Acetylcholine (5-20 mg/min).
Andre navne:
  • BK
  • SNP
  • ACh
Procedure: Badimon Chamber
Ex-vivo assessment of thrombus formation using Badimon Chamber
Eksperimentel: Filtered Diesel Exposure
1 hour exposure to diesel exhaust with all particulates filtered out using teflon filter with intermittent exercise
Procedure: Forearm Vascular Study
Forearm venous occlusion plethysmography to measure forearm blood flow during intra-arterial infusion of the vasodilators Verapamil (10-100 µg/min), bradykinin (100-1000 pmol/min), sodium nitroprusside (2-8 µg/min) and Acetylcholine (5-20 mg/min).
Andre navne:
  • BK
  • SNP
  • ACh
Procedure: Badimon Chamber
Ex-vivo assessment of thrombus formation using Badimon Chamber
Eksperimentel: PALAS Exposure
1 hour exposure to pure carbon particles produced by PALAS generator during intermittent exercise
Procedure: Forearm Vascular Study
Forearm venous occlusion plethysmography to measure forearm blood flow during intra-arterial infusion of the vasodilators Verapamil (10-100 µg/min), bradykinin (100-1000 pmol/min), sodium nitroprusside (2-8 µg/min) and Acetylcholine (5-20 mg/min).
Andre navne:
  • BK
  • SNP
  • ACh
Procedure: Badimon Chamber
Ex-vivo assessment of thrombus formation using Badimon Chamber

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Tidsramme
Forearm blood flow measured by forearm venous occlusion plethysmography in response to infused vasodilators
Tidsramme: 6-8 hours after exposure
6-8 hours after exposure

Sekundære resultatmål

Resultatmål
Tidsramme
Ex-vivo thrombus formation assessed using the Badimon chamber
Tidsramme: 6 hours after exposure
6 hours after exposure
Arterial stiffness measured by radial artery tonometry
Tidsramme: Before and after exposure
Before and after exposure
Heart rate and heart rate variability measured with 3 lead Holter electrographic monitors
Tidsramme: During and for 24 hours after exposure
During and for 24 hours after exposure
Blood pressure
Tidsramme: During and after exposure and during forearm study
During and after exposure and during forearm study
Plasma t-PA and PAI concentrations following infusion of bradykinin
Tidsramme: During forearm study
During forearm study
Plasma inflammatory markers IL-6, TNF-alpha, IL-1 and hsCRP
Tidsramme: Before and after exposure
Before and after exposure
Platelet monocyte binding as measured by flow cytometry
Tidsramme: After the exposure
After the exposure

Samarbejdspartnere og efterforskere

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

Sponsor

University of Edinburgh

Samarbejdspartnere

National Institute for Public Health and the Environment (RIVM)

Efterforskere

  • Ledende efterforsker: Nicholas L Mills, MB BCh MRCP, University of Edinburgh

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

1. september 2005

Primær færdiggørelse (Faktiske)

1. marts 2006

Studieafslutning (Faktiske)

1. marts 2006

Datoer for studieregistrering

Først indsendt

16. oktober 2008

Først indsendt, der opfyldte QC-kriterier

16. oktober 2008

Først opslået (Skøn)

17. oktober 2008

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Skøn)

17. oktober 2008

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

16. oktober 2008

Sidst verificeret

1. oktober 2008

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Andre undersøgelses-id-numre

  • 05/S1103/46

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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