Does Routine Pressure Wire Assessment Influence Management Strategy at Coronary Angiography for Diagnosis of Chest Pain?
NCT ID: NCT01070771
Last Updated: 2019-05-22
Study Results
Results available
Outcome measurements, participant flow, baseline characteristics, and adverse events have been published for this study.
View full resultsBasic Information
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Recruitment Status
COMPLETED
Clinical Phase
NA
Total Enrollment
203 participants
Study Classification
INTERVENTIONAL
Study Start Date
2008-06-30
Study Completion Date
2012-08-31
Brief Summary
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The use of coronary angiography to investigate patients at risk of coronary artery narrowings has become universal. In most cases, this investigation leads to a successful treatment plan with revascularisation recommended where appropriate. However in a substantial number of patients, the images taken of the coronary arteries can lead to diagnostic uncertainty. Increasingly, doctors are using devices called pressure wires to clarify the significance of coronary artery narrowings in order to tailor patient treatment on an individual basis.
The Radi pressure wire is well recognised as a reliable tool in assessing whether a narrowing is significant in functional terms, that is, does it significantly restrict blood flow to the heart muscle.It consists of a fine wire that is fed into individual major coronary arteries to measure pressure within the vessel itself. In conjunction with the images taken of the arteries, it is very useful in deciding how best to treat patients.
This study enrolls volunteers who are being investigated for stable cardiac-sounding chest pain and are undergoing a coronary angiogram. It will investigate whether the extra information gained from pressure wire assessment will change patients' treatment plan.
The Radi pressure wire is well recognised as a reliable tool in assessing whether a narrowing is significant in functional terms, that is, does it significantly restrict blood flow to the heart muscle.It consists of a fine wire that is fed into individual major coronary arteries to measure pressure within the vessel itself. In conjunction with the images taken of the arteries, it is very useful in deciding how best to treat patients.
This study enrolls volunteers who are being investigated for stable cardiac-sounding chest pain and are undergoing a coronary angiogram. It will investigate whether the extra information gained from pressure wire assessment will change patients' treatment plan.
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Detailed Description
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The choice of management in an individual patient is determined largely by the presence and distribution of significant coronary narrowings. Usually, this significance is judged by the visual estimation of a narrowing on an angiogram. However, although this is the standard way of assessing coronary narrowings, it is now widely published that pressure wire measurements are more accurate because they assess the true physiological consequences of the narrowing. Interventional cardiologists now frequently use Fractional Flow Reserve (FFR) measurements to help them decide if arteries require stenting.The hypothesis for this study is that routine measurement of FFR in the main coronary arteries could provide diagnostic information above and beyond that obtained by an angiogram alone. This additional information may well then affect the choice of management in a proportion of these patients. For example, a narrowing considered to be significant angiographically may be shown to be insignificant with FFR, or vice versa.
Background
Coronary artery disease (CAD) is a major cause of morbidity and mortality in the United Kingdom. It accounts for approximately half of all cardiovascular related deaths annually and, according to statistics from the British Heart Foundation, CAD related expenditure was £3,500 million in 2003 alone. Much effort has been placed on improving methods that detect and assess the severity of CAD and facilitate more rapid and appropriate management for CAD patients. Once diagnosed, CAD may be treated in 3 ways: (1)tablets alone, (2)tablets plus angioplasty with stents or (3) tablets plus coronary artery bypass graft surgery (CABG). The method of choice depends primarily on the extent and severity of disease at the time of coronary angiography. Coronary angiography is the current conventional method for the diagnosis of CAD and is used in the assessment of disease severity. For the angiographic procedure,vascular access is secured via the femoral artery or radial artery route and a dye is injected into the coronary artery blood vessels. The progress of the dye through the coronary blood vessels provides a visual assessment of where narrowings are present in the coronary arteries.
Where there is thought to be significant flow obstruction, particularly in symptomatic patients, one of the above three treatments will be offered.
While coronary angiography has revolutionised the management of CAD, the procedure is not without limitation. The purely visual assessment of disease severity with coronary angiography is subjective and patient management can depend on the cardiologist reviewing the films. Many such narrowings can be graded 'moderate' severity and deciding whether these are of haemodynamic significance is notoriously difficult by angiography alone. In recent years, the Radi pressure wire has been shown to provide accurate physiological haemodynamic data about coronary narrowings. Furthermore, the FFR measurement derived predicts clinical outcome, hence giving a 'cut-off' measurement for severity of disease that correlates with the requirement for revascularisation with either stents or surgery. Thus FFR is now frequently used in clinical practice by interventional cardiologists to decide if narrowings require treatment. However, the majority of diagnostic angiography in the UK is performed by non-interventional cardiologists who do not currently have access to the pressure wire technology. In this study, we speculate that if we measure the FFR routinely in all the main coronary arteries of patients undergoing coronary angiography the FFR data obtained may affect the angiogram-derived management of some patients in terms of the choice of tablets/stents/CABG. For example, some narrowings that look significant angiographically may not be haemodynamically important by FFR and vice versa. Clearly this could make a difference between revascularising a patient or not.
Research Aims
To evaluate:
1. The degree of correlation between standard angiographic assessment of the coronary arteries and pressure wire assessment of the main arteries.
2. To determine whether the FFR data would influence the management strategy for patients as derived only on the basis of the angiogram (which represents clinical practice).
Methods and Design
The study will recruit 200 patients listed for diagnostic coronary angiography performed by a non-interventional cardiologist.
Methodology 1: In Catheter Laboratory
* All patients will receive an information sheet after initial invitation to take part.
* Written informed consent will be obtained.
* Patients will undergo coronary angiography in a routine manner.
* The non-interventional cardiologist in charge of the patient's care will analyse the pictures and grade the outcome in the manner shown in table 1. He/she will formulate a management plan consistent with their routine clinical practice and independent of subsequent pressure wire data. This management plan will be documented in the CRF. He/she will then take no further part in the procedure.
Table 1
1. Are there significant stenoses (\>70% by eyeball) in the major epicardial vessels (i.e. main coronaries or any branch of \>2.25mm)
2. Recommend revascularisation or medical/conservative treatment
3. If revascularisation: recommended strategy for referral (Percutaneous Coronary Intervention (PCI) or CABG?) and which vessels (i.e. LAD + RCA etc) represent targets for that revascularisation
* The management strategy will be recorded according to the following options:
1. medical;
2. PCI
3. CABG
* Data will also be collected in regard to vessels as targets (i.e. which vessels require stent/graft)
* If the non-interventional cardiologist cannot make a plan they can allocate the patient to a fourth category in which "more data are required". Such patients are generally then referred for further non-invasive stress imaging or even for a pressure wire.
* FFR measurements will then be undertaken by a consultant interventional cardiologist
* Additional screening time and contrast use accrued during FFR measurements will be recorded.
* The patient will be given 70units/kg heparin i.a. or i.v. prior to passage of the pressure wire
* A pressure wire will be introduced into the distal third of all patent major epicardial coronary arteries and branches of \>2.25mm with TIMI 3 flow.
* FFR measurements will be taken using either intracoronary or intravenous adenosine according to local conventional practice and operator preference.
* The protocol mandates i.v. adenosine for ostial LM stem and ostial RCA stenoses.
* Where i.c. adenosine bolus is employed, the minimum data required by the study is: 1 baseline FFR without adenosine and 2 boluses with at least 50mcg adenosine.
* An angiogram will be acquired before the first adenosine measurement to document satisfactory engagement of the guiding catheter and the position of the measurement in each vessel
* The minimum FFR reading will be taken in each case
* FFR readings of \<0.8 will be considered as representing haemodynamic significance as per FAME protocol
* Once the FFR data are derived the procedure will be finished and haemostasis will be achieved in the normal manner
* Provided the angiogram-derived management plan has been recorded in the CRF then the FFR data can then be revealed to the non-interventional cardiologist. The management plan will then be recorded in the light of the FFR data using the same categories and dataset as previously.
* The non-interventionalists will then manage the patient as they see fit
Analysis
PRIMARY ENDPOINT Estimation of number of cases where FFR data results in a change in the management strategy the revascularisation strategy (number of vessel requiring treatment and/or PCI vs medical vs CABG)
Potential Clinical Value
If this study proves its hypothesis, it will suggest that coronary angiography would be better supported by routine pressure wire assessment in order to tailor revascularisation strategies for individual patients more accurately. The result of this study will carry important clinical implications if the study hypothesis is proven.... not least in terms of potential patient benefit. The current widely held practice of diagnostic test followed by either (i) referral for revascularisation or, (ii) in the case of equivocal angiographic results, referral for stress imaging to look for objective evidence of ischaemia followed by referral for revascularisation where positive could be rendered obsolete by diagnostic angiography performed by interventional cardiologists with FFR availability and the ability to perform PCI at the same sitting where appropriate.
The study may generate the hypothesis that such routine FFR measurement will not only be of benefit to patients but also be cost-effective if there would have been fewer interventions overall (ie less CABG + PCI) or fewer expensive interventions (i.e. less CABG versus PCI)?
Background
Coronary artery disease (CAD) is a major cause of morbidity and mortality in the United Kingdom. It accounts for approximately half of all cardiovascular related deaths annually and, according to statistics from the British Heart Foundation, CAD related expenditure was £3,500 million in 2003 alone. Much effort has been placed on improving methods that detect and assess the severity of CAD and facilitate more rapid and appropriate management for CAD patients. Once diagnosed, CAD may be treated in 3 ways: (1)tablets alone, (2)tablets plus angioplasty with stents or (3) tablets plus coronary artery bypass graft surgery (CABG). The method of choice depends primarily on the extent and severity of disease at the time of coronary angiography. Coronary angiography is the current conventional method for the diagnosis of CAD and is used in the assessment of disease severity. For the angiographic procedure,vascular access is secured via the femoral artery or radial artery route and a dye is injected into the coronary artery blood vessels. The progress of the dye through the coronary blood vessels provides a visual assessment of where narrowings are present in the coronary arteries.
Where there is thought to be significant flow obstruction, particularly in symptomatic patients, one of the above three treatments will be offered.
While coronary angiography has revolutionised the management of CAD, the procedure is not without limitation. The purely visual assessment of disease severity with coronary angiography is subjective and patient management can depend on the cardiologist reviewing the films. Many such narrowings can be graded 'moderate' severity and deciding whether these are of haemodynamic significance is notoriously difficult by angiography alone. In recent years, the Radi pressure wire has been shown to provide accurate physiological haemodynamic data about coronary narrowings. Furthermore, the FFR measurement derived predicts clinical outcome, hence giving a 'cut-off' measurement for severity of disease that correlates with the requirement for revascularisation with either stents or surgery. Thus FFR is now frequently used in clinical practice by interventional cardiologists to decide if narrowings require treatment. However, the majority of diagnostic angiography in the UK is performed by non-interventional cardiologists who do not currently have access to the pressure wire technology. In this study, we speculate that if we measure the FFR routinely in all the main coronary arteries of patients undergoing coronary angiography the FFR data obtained may affect the angiogram-derived management of some patients in terms of the choice of tablets/stents/CABG. For example, some narrowings that look significant angiographically may not be haemodynamically important by FFR and vice versa. Clearly this could make a difference between revascularising a patient or not.
Research Aims
To evaluate:
1. The degree of correlation between standard angiographic assessment of the coronary arteries and pressure wire assessment of the main arteries.
2. To determine whether the FFR data would influence the management strategy for patients as derived only on the basis of the angiogram (which represents clinical practice).
Methods and Design
The study will recruit 200 patients listed for diagnostic coronary angiography performed by a non-interventional cardiologist.
Methodology 1: In Catheter Laboratory
* All patients will receive an information sheet after initial invitation to take part.
* Written informed consent will be obtained.
* Patients will undergo coronary angiography in a routine manner.
* The non-interventional cardiologist in charge of the patient's care will analyse the pictures and grade the outcome in the manner shown in table 1. He/she will formulate a management plan consistent with their routine clinical practice and independent of subsequent pressure wire data. This management plan will be documented in the CRF. He/she will then take no further part in the procedure.
Table 1
1. Are there significant stenoses (\>70% by eyeball) in the major epicardial vessels (i.e. main coronaries or any branch of \>2.25mm)
2. Recommend revascularisation or medical/conservative treatment
3. If revascularisation: recommended strategy for referral (Percutaneous Coronary Intervention (PCI) or CABG?) and which vessels (i.e. LAD + RCA etc) represent targets for that revascularisation
* The management strategy will be recorded according to the following options:
1. medical;
2. PCI
3. CABG
* Data will also be collected in regard to vessels as targets (i.e. which vessels require stent/graft)
* If the non-interventional cardiologist cannot make a plan they can allocate the patient to a fourth category in which "more data are required". Such patients are generally then referred for further non-invasive stress imaging or even for a pressure wire.
* FFR measurements will then be undertaken by a consultant interventional cardiologist
* Additional screening time and contrast use accrued during FFR measurements will be recorded.
* The patient will be given 70units/kg heparin i.a. or i.v. prior to passage of the pressure wire
* A pressure wire will be introduced into the distal third of all patent major epicardial coronary arteries and branches of \>2.25mm with TIMI 3 flow.
* FFR measurements will be taken using either intracoronary or intravenous adenosine according to local conventional practice and operator preference.
* The protocol mandates i.v. adenosine for ostial LM stem and ostial RCA stenoses.
* Where i.c. adenosine bolus is employed, the minimum data required by the study is: 1 baseline FFR without adenosine and 2 boluses with at least 50mcg adenosine.
* An angiogram will be acquired before the first adenosine measurement to document satisfactory engagement of the guiding catheter and the position of the measurement in each vessel
* The minimum FFR reading will be taken in each case
* FFR readings of \<0.8 will be considered as representing haemodynamic significance as per FAME protocol
* Once the FFR data are derived the procedure will be finished and haemostasis will be achieved in the normal manner
* Provided the angiogram-derived management plan has been recorded in the CRF then the FFR data can then be revealed to the non-interventional cardiologist. The management plan will then be recorded in the light of the FFR data using the same categories and dataset as previously.
* The non-interventionalists will then manage the patient as they see fit
Analysis
PRIMARY ENDPOINT Estimation of number of cases where FFR data results in a change in the management strategy the revascularisation strategy (number of vessel requiring treatment and/or PCI vs medical vs CABG)
Potential Clinical Value
If this study proves its hypothesis, it will suggest that coronary angiography would be better supported by routine pressure wire assessment in order to tailor revascularisation strategies for individual patients more accurately. The result of this study will carry important clinical implications if the study hypothesis is proven.... not least in terms of potential patient benefit. The current widely held practice of diagnostic test followed by either (i) referral for revascularisation or, (ii) in the case of equivocal angiographic results, referral for stress imaging to look for objective evidence of ischaemia followed by referral for revascularisation where positive could be rendered obsolete by diagnostic angiography performed by interventional cardiologists with FFR availability and the ability to perform PCI at the same sitting where appropriate.
The study may generate the hypothesis that such routine FFR measurement will not only be of benefit to patients but also be cost-effective if there would have been fewer interventions overall (ie less CABG + PCI) or fewer expensive interventions (i.e. less CABG versus PCI)?
Conditions
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Coronary Artery Disease
Study Design
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Allocation Method
NA
Intervention Model
SINGLE_GROUP
Primary Study Purpose
DIAGNOSTIC
Blinding Strategy
NONE
Interventions
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Radi pressure wire (pressure wire assessment)
Intracoronary insertion of pressure wire at the time of diagnostic angiography.
Intervention Type
DEVICE
Other Intervention Names
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Radi pressure wire.
Eligibility Criteria
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Inclusion Criteria
* Patients referred for elective coronary angiography under a non-interventional cardiologist for the investigation of chest pain thought to be of cardiac origin.
* There is no requirement for a test demonstrating objective evidence of myocardial ischaemia because this study aims to recruit consecutive patients in real world current practice
* Written informed consent
* No participation in other studies
* There is no requirement for a test demonstrating objective evidence of myocardial ischaemia because this study aims to recruit consecutive patients in real world current practice
* Written informed consent
* No participation in other studies
Exclusion Criteria
* Previous coronary artery bypass graft surgery
* Acute coronary syndrome at presentation
* Diagnostic angiography or percutaneous coronary intervention within the previous 12 months
* Contraindication to adenosine
* Severe valve disease
* Creatinine \>180
* Life threatening comorbidity
* Diagnostic angiogram showing "normal" coronary arteries defined as no coronary stenosis of \>30% by visual estimate in any epicardial vessel of \>2.25mm diameter
* Acute coronary syndrome at presentation
* Diagnostic angiography or percutaneous coronary intervention within the previous 12 months
* Contraindication to adenosine
* Severe valve disease
* Creatinine \>180
* Life threatening comorbidity
* Diagnostic angiogram showing "normal" coronary arteries defined as no coronary stenosis of \>30% by visual estimate in any epicardial vessel of \>2.25mm diameter
Minimum Eligible Age
18 Years
Eligible Sex
ALL
Accepts Healthy Volunteers
No
Sponsors
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University Hospital Southampton NHS Foundation Trust
OTHER
Sponsor Role
lead
Responsible Party
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Responsibility Role
SPONSOR
Principal Investigators
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Nick Curzen, BM(Hons) PhD FRCP
Role: PRINCIPAL_INVESTIGATOR
University Hospital Southampton NHS Foundation Trust
Locations
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Dr Colm Hanratty
Belfast, , Ireland
Site Status
Dr Alex Hobson
Portsmouth, Hampshire, United Kingdom
Site Status
Dr Dan McKenzie
Taunton, Somerset, United Kingdom
Site Status
Royal Sussex County Hospital
Brighton, , United Kingdom
Site Status
Dr Kamal Chitkara
Derby, , United Kingdom
Site Status
West of Scotland Regional Heart & Lung Centre
Glasgow, , United Kingdom
Site Status
Dr Steve Wheatcroft
Leeds, , United Kingdom
Site Status
Freeman Hospital
Newcastle upon Tyne, , United Kingdom
Site Status
John Radcliffe Hospital
Oxford, , United Kingdom
Site Status
Southampton General Hospital
Southampton, , United Kingdom
Site Status
Countries
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Ireland
United Kingdom
References
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Curzen N, Rana O, Nicholas Z, Golledge P, Zaman A, Oldroyd K, Hanratty C, Banning A, Wheatcroft S, Hobson A, Chitkara K, Hildick-Smith D, McKenzie D, Calver A, Dimitrov BD, Corbett S. Does routine pressure wire assessment influence management strategy at coronary angiography for diagnosis of chest pain?: the RIPCORD study. Circ Cardiovasc Interv. 2014 Apr;7(2):248-55. doi: 10.1161/CIRCINTERVENTIONS.113.000978. Epub 2014 Mar 18.
Reference Type
RESULT
Bashar HAB, Saunders A, Alaour B, Gerontitis D, Hinton J, Karamanou D, Kechagioglou G, Olsen S, Onwordi E, Pope M, Zingale A, Nicholas Z, Golledge P, Escaned J, Ali Z, Curzen N. Systematic coronary physiology improves level of agreement in diagnostic coronary angiography. Open Heart. 2023 May;10(1):e002258. doi: 10.1136/openhrt-2023-002258.
Reference Type
DERIVED
Stables RH, Mullen LJ, Elguindy M, Nicholas Z, Aboul-Enien YH, Kemp I, O'Kane P, Hobson A, Johnson TW, Khan SQ, Wheatcroft SB, Garg S, Zaman AG, Mamas MA, Nolan J, Jadhav S, Berry C, Watkins S, Hildick-Smith D, Gunn J, Conway D, Hoye A, Fazal IA, Hanratty CG, De Bruyne B, Curzen N. Routine Pressure Wire Assessment Versus Conventional Angiography in the Management of Patients With Coronary Artery Disease: The RIPCORD 2 Trial. Circulation. 2022 Aug 30;146(9):687-698. doi: 10.1161/CIRCULATIONAHA.121.057793. Epub 2022 Aug 10.
Reference Type
DERIVED
Related Links
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http://circinterventions.ahajournals.org/
Does Routine Pressure Wire Assessment Influence Management Strategy at Coronary Angiography for Diagnosis of Chest Pain?: The RIPCORD Study
Other Identifiers
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5327
Identifier Type: REGISTRY
Identifier Source: secondary_id
Version 3 dated 01/10/2009
Identifier Type: -
Identifier Source: org_study_id
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