Combustion Derived Air Pollution and Vascular Function
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:
- Combustion derived nanoparticulate causes an acute impairment of endothelial vasomotor and fibrinolytic function in healthy volunteers.
- Exposure to combustion derived air pollution is associated with increased thrombus formation.
調査の概要
研究の種類
入学 (実際)
段階
- 適用できない
連絡先と場所
研究場所
-
-
-
Edinburgh、イギリス、EH16 4SB
- University of Edinburgh
-
-
参加基準
適格基準
就学可能な年齢
- 子
- 大人
- 高齢者
健康ボランティアの受け入れ
受講資格のある性別
説明
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
研究計画
研究はどのように設計されていますか?
デザインの詳細
- 主な目的:基礎科学
- 割り当て:ランダム化
- 介入モデル:クロスオーバー割り当て
- マスキング:トリプル
武器と介入
参加者グループ / アーム |
介入・治療 |
---|---|
実験的:Filtered Air Exposure
1 hour exposure to filtered air during intermittent exercise
|
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).
他の名前:
Ex-vivo assessment of thrombus formation using Badimon Chamber
|
実験的:Diesel Exhaust Exposure
1 hour exposure to dilute diesel exhaust at a concentration of 300 µg/m3 during intermittent exercise
|
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).
他の名前:
Ex-vivo assessment of thrombus formation using Badimon Chamber
|
実験的:Filtered Diesel Exposure
1 hour exposure to diesel exhaust with all particulates filtered out using teflon filter with intermittent exercise
|
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).
他の名前:
Ex-vivo assessment of thrombus formation using Badimon Chamber
|
実験的:PALAS Exposure
1 hour exposure to pure carbon particles produced by PALAS generator during intermittent exercise
|
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).
他の名前:
Ex-vivo assessment of thrombus formation using Badimon Chamber
|
この研究は何を測定していますか?
主要な結果の測定
結果測定 |
時間枠 |
---|---|
Forearm blood flow measured by forearm venous occlusion plethysmography in response to infused vasodilators
時間枠:6-8 hours after exposure
|
6-8 hours after exposure
|
二次結果の測定
結果測定 |
時間枠 |
---|---|
Ex-vivo thrombus formation assessed using the Badimon chamber
時間枠:6 hours after exposure
|
6 hours after exposure
|
Arterial stiffness measured by radial artery tonometry
時間枠:Before and after exposure
|
Before and after exposure
|
Heart rate and heart rate variability measured with 3 lead Holter electrographic monitors
時間枠:During and for 24 hours after exposure
|
During and for 24 hours after exposure
|
Blood pressure
時間枠: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
時間枠:During forearm study
|
During forearm study
|
Plasma inflammatory markers IL-6, TNF-alpha, IL-1 and hsCRP
時間枠:Before and after exposure
|
Before and after exposure
|
Platelet monocyte binding as measured by flow cytometry
時間枠:After the exposure
|
After the exposure
|
協力者と研究者
スポンサー
捜査官
- 主任研究者:Nicholas L Mills, MB BCh MRCP、University of Edinburgh
出版物と役立つリンク
一般刊行物
- Mills NL, Tornqvist H, Robinson SD, Gonzalez M, Darnley K, MacNee W, Boon NA, Donaldson K, Blomberg A, Sandstrom T, Newby DE. Diesel exhaust inhalation causes vascular dysfunction and impaired endogenous fibrinolysis. Circulation. 2005 Dec 20;112(25):3930-6. doi: 10.1161/CIRCULATIONAHA.105.588962.
- Langrish JP, Watts SJ, Hunter AJ, Shah AS, Bosson JA, Unosson J, Barath S, Lundback M, Cassee FR, Donaldson K, Sandstrom T, Blomberg A, Newby DE, Mills NL. Controlled exposures to air pollutants and risk of cardiac arrhythmia. Environ Health Perspect. 2014 Jul;122(7):747-53. doi: 10.1289/ehp.1307337. Epub 2014 Mar 25.
研究記録日
主要日程の研究
研究開始
一次修了 (実際)
研究の完了 (実際)
試験登録日
最初に提出
QC基準を満たした最初の提出物
最初の投稿 (見積もり)
学習記録の更新
投稿された最後の更新 (見積もり)
QC基準を満たした最後の更新が送信されました
最終確認日
詳しくは
この情報は、Web サイト clinicaltrials.gov から変更なしで直接取得したものです。研究の詳細を変更、削除、または更新するリクエストがある場合は、register@clinicaltrials.gov。 までご連絡ください。 clinicaltrials.gov に変更が加えられるとすぐに、ウェブサイトでも自動的に更新されます。
Forearm Vascular Studyの臨床試験
-
Radicle Science積極的、募集していない
-
Cardiva Medical, Inc.完了
-
Belfast Health and Social Care TrustBristol Royal Infirmary; Royal Infirmary of Edinburgh; Golden Jubilee National Hospitalわからない
-
Digisight Technologies, Inc.わからない