The Effect of GRAVITY on Physiological Measurements During Invasive Coronary Angiography and Intervention
NCT ID: NCT03097172
Last Updated: 2020-12-22
Study Results
The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.
Basic Information
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COMPLETED
22 participants
OBSERVATIONAL
2017-06-01
2019-12-31
Brief Summary
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When patients present with heart attacks involving completely occluded heart arteries, there are signs anecdotally and in literature that arteries sitting higher up with the patient lying flat, receive less blood supply than arteries sitting lower down.
The investigators believe this effect is due to the pull of gravity on the flow of blood through the heart arteries. If this is indeed the case, changing position from lying supine (patient on their back) to lying prone (patient on their front) could reverse these anatomical positions and change measurements obtained during a coronary angiogram. These measurements include pressure and flow.
Detailed Description
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Group 1 - stable elective patients with stenotic coronary arteries. These patients are referred as outpatients for a 'pressure wire' test.
Group 2 - stable elective patients with a chronic total occlusion of an artery (CTO). The artery will be either the left anterior descending artery (LAD) or right coronary artery (RCA)
Group 1 - 30 patients
Patients will be recruited from referrals to the centre for a pressure wire study. Participants will be screened for eligibility using the protocol inclusion and exclusion criteria. Study information will be given and informed consent obtained.
Patients will start the procedure prone. A physiology wire will be placed in the artery of interest and measurements taken. Patients will then be turned into the standard supine position with repeat measurements. The study is now completed. The usual pressure measurements will be taken and used to guide treatment as per standard protocol.
Group 2 - 20 patients
Patients will be recruited from referrals to the centre for a percutaneous coronary intervention (PCI) to a chronic total occlusion (CTO). Participants will be screened for eligibility using the protocol inclusion and exclusion criteria. Study information will be given and informed consent obtained.
Patients will undergo CTO PCI as per standard procedure. Once completed, the vessel will be occluded using balloon inflation. Physiological measurements will be taken distal to the occluded balloon. The patient will then be turned prone and repeat measurements again with balloon occlusion will be taken.
This group will have MRI scanning as part of standard care before the procedure. The study will carry out a further MRI, this time in the prone position before PCI as part of the study protocol
Conditions
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Keywords
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Study Design
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COHORT
PROSPECTIVE
Study Groups
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Group 1
Stable elective patients Stenotic coronary artery 10 x LAD 10 x RCA 10 x Cx
30 patients total
No interventions assigned to this group
Group 2
Stable elective patients Chronic total occlusion of one artery
10 x LAD 10 x RCA
20 patients total
No interventions assigned to this group
Eligibility Criteria
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Inclusion Criteria
2. Angina symptoms or evidence of myocardial ischaemia
3. Stenosis \>50% in LAD or RCA on coronary angiogram or CT coronary angiogram
4. Participant is willing and able to give informed consent
5. Eligible for PCI
1. Age \>18 years of age
2. Stable angina / ischaemic symptoms / and / or
3. Evidence of viability and /or ischaemia in the chronic total occlusion (CTO) territory
4. Participant is willing and able to give informed consent.
5. Presence of chronic total occlusion (CTO) in LAD or RCA
6. Eligible for PCI to a chronic total occlusion (CTO)
Exclusion Criteria
2. Significant left main stem stenosis
3. Lesion of interest in Circumflex artery
4. Haemodynamic Instability
5. Unable to consent
6. Unable to receive dual antiplatelet therapy
7. Contraindication to adenosine
8. Recent acute coronary syndrome (ACS) (\<48 hours)
9. Pregnancy
10. Unable to lie prone
11. Severe valvular heart disease or cardiomyopathy
Group 2
1. Previous CABG with any patent grafts
2. Significant left main stem stenosis
3. Dominant collateral supply from circumflex artery
4. Both LAD and RCA occluded
5. Haemodynamic instability
6. Unable to receive antiplatelet therapy
7. Contraindication to adenosine
8. Recent ACS (\<48 hours)
9. eGFR\<40
10. Pregnancy
11. Severe valvular heart disease or cardiomyopathy
12. Contraindication to Cardiac MRI
13. Unable to lie prone
18 Years
ALL
No
Sponsors
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Anglia Ruskin University
OTHER
Mid and South Essex NHS Foundation Trust
OTHER
Responsible Party
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Principal Investigators
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John R Davies, MBBS, PhD
Role: PRINCIPAL_INVESTIGATOR
Essex Cardiothoracic Centre, Basildon and Thurrock University Hospitals Foundation Trust
Locations
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The Essex Cardiothoracic Centre
Basildon, Essex, United Kingdom
Countries
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Other Identifiers
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B905
Identifier Type: -
Identifier Source: org_study_id