An interventional study of Forearm vascular study in Ischaemic Heart Diseases, sponsored by University of Edinburgh. Completed at 1 site in United Kingdom. Open to male participants aged 18 Years to 65 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2010-10-25.
Sponsored by University of Edinburgh · Not applicable, Interventional, and Basic science
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.
3,639 studies on the registry are indexed under Heart Diseases; 461 are open to participants now.
This study's planned enrollment of 12 is below the median of 100 across 1,778 interventional studies indexed under Heart Diseases.
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Exclusion Criteria:
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.
Procedure: Forearm vascular study
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.
Procedure: Forearm vascular study
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.
Procedure: Forearm vascular study
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.
Net t-PA release from the endothelium after ischaemia reperfusion and ischaemic preconditioning
Time frame: Throughout the study
Change in forearm blood flow after ischaemia reperfusion and ischaemic preconditioning
Time frame: throughout the study
Change in platelet-monocyte-binding after ischaemia reperfusion and ischaemic preconditioning
Time frame: Throughout the study
This study is completed, as verified in Oct 2010. You cannot join it, but the record below documents what was studied.
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University of Edinburgh