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| Name | Class |
|---|---|
| University of Aarhus | OTHER |
| University of Oxford | OTHER |
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Heart attacks are usually caused by a blood clot blocking an artery supplying blood to the heart. Current treatments are designed at relieving this blockage as quickly as possible to minimise damage to the heart muscle. However in restoring the supply of blood local damage known as "ischaemia-reperfusion injury" may occur. The aim of this study is to assess how clot forming and clot dissolving pathways are affected during this process, and examine the role of a natural inflammatory hormone, bradykinin. This will help us to understand the mechanism by which ischaemia-reperfusion injury may occur and to devise new treatments for heart attacks.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| 1 | Active Comparator | Prior to 20 mins of ischaemia induced by a blood pressure cuff inflated to 200 mmHg around the upper non-dominant arm, local ischaemic preconditioning will be induced by inflating a cuff around the non-dominant arm to 200 mmHg for 5 mins followed by 5 mins of reperfusion. This cycle will be repeated 3 times. |
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| 2 | Active Comparator | Prior to 20 mins of ischaemia induced by a blood pressure cuff inflated to 200 mmHg around the upper non-dominant arm, remote ischaemic preconditioning will be induced by inflating a cuff around the dominant arm to 200 mmHg for 5 mins followed by 5 mins of reperfusion. This cycle will be repeated 3 times. |
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| 3 | Placebo Comparator | Prior to 20 mins of ischaemia induced by a blood pressure cuff inflated to 200 mmHg around the upper non-dominant arm, sham will be performed by inflating a cuff to 10 mmHg for 5 mins followed by 5 mins of deflation. This cycle will be repeated 3 times. |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Forearm vascular study | Procedure | Forearm blood flow measured by venous occlusion plethysmography during interarterial infusion of substance P (2,4,8 pmol/min). Venous blood sampling via cannula in antecubital fossa. |
| Measure | Description | Time Frame |
|---|---|---|
| Net t-PA release from the endothelium after ischaemia reperfusion and ischaemic preconditioning | Throughout the study |
| Measure | Description | Time Frame |
|---|---|---|
| Change in forearm blood flow after ischaemia reperfusion and ischaemic preconditioning | throughout the study | |
| Change in platelet-monocyte-binding after ischaemia reperfusion and ischaemic preconditioning | Throughout the study |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| David E Newby, PhD, FRCP | University of Edinburgh | Study Director |
| Rajesh K Kharbanda, PhD, FRCP | University of Oxford | Study Director |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| University of Edinburgh, 49 Little France Crescent | Edinburgh | EH16 4SB | United Kingdom |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 21990263 | Derived | Pedersen CM, Barnes G, Schmidt MR, Botker HE, Kharbanda RK, Newby DE, Cruden NL. Ischaemia-reperfusion injury impairs tissue plasminogen activator release in man. Eur Heart J. 2012 Aug;33(15):1920-7. doi: 10.1093/eurheartj/ehr380. Epub 2011 Oct 11. | |
| 21083644 | Derived | Pedersen CM, Cruden NL, Schmidt MR, Lau C, Botker HE, Kharbanda RK, Newby DE. Remote ischemic preconditioning prevents systemic platelet activation associated with ischemia-reperfusion injury in humans. J Thromb Haemost. 2011 Feb;9(2):404-7. doi: 10.1111/j.1538-7836.2010.04142.x. No abstract available. |
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| ID | Term |
|---|---|
| D003324 | Coronary Artery Disease |
| ID | Term |
|---|---|
| D003327 | Coronary Disease |
| D017202 | Myocardial Ischemia |
| D006331 | Heart Diseases |
| D002318 | Cardiovascular Diseases |
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| D001161 |
| Arteriosclerosis |
| D001157 | Arterial Occlusive Diseases |
| D014652 | Vascular Diseases |