High Risk of Significant Coronary Artery Disease Clinical Trial
Official title:
Pilot Study to Assess the Feasibility and Diagnostic Performance of Computed Tomographic Coronary Angiography Using Cardiac Gemstone Spectral Imaging (Cardiac GSI) in Patients With High-risk of Significant Coronary Artery Disease and Myocardial Scar
| Verified date | October 2016 |
| Source | Plymouth Hospitals NHS Trust |
| Contact | n/a |
| Is FDA regulated | No |
| Health authority | United Kingdom: National Health Service |
| Study type | Interventional |
The recently introduced Computed tomography (CT) scanner, Discovery CT750 HD (GE Healthcare,
Milwaukee), incorporates a battery of innovations aimed at improving diagnostic image
quality, evaluating perfusion and assessing for scar, in an effort to address the current
shortcomings of Computed tomographic coronary angiography (CTCA) in patients with
significant coronary artery disease. The new scanner will use a novel method of scanning
(Cardiac Gemstone Spectral Imaging - Cardiac GSI) and image reconstruction (Adaptive
Statistical Iterative Reconstruction- ASIR) as opposed to standard definition 64-slice CT
Multi-detector row computed tomography(MDCT)and Filtered Back Projection (FBP) used by the
conventional CT scanners. The Cardiac GSI protocol enables the scanner to acquire images at
two different x-ray energies almost simultaneously, which can be post-processed to
selectively reduce beam hardening artefacts and delete materials with specific attenuating
properties from the images, such as coronary calcium. ASIR offsets the potential increase in
radiation dose required for Cardiac GSI scanning. This will potentially result in images of
higher diagnostic quality with an equivalent or perhaps lower dose of radiation compared to
present technology.
Furthermore, it is hypothesised that dual-energy acquisition may improve the accuracy of the
assessment of perfusion.
Although initial in-vitro results are encouraging, this technology has not been rigorously
assessed with regards to its feasibility and diagnostic quality, limiting its applicability
in routine clinical practice. This assessment will require a trial comparing the accuracy of
Cardiac GSI CTCA with that of Invasive coronary angiography (ICA) for anatomical assessment
of stenosis, Myocardial Perfusion Imaging with Single Photon Emission Computed Tomography
(MPI-SPECT) for assessment of perfusion and Cardiac Magnetic Resonance (CMR) for assessment
of myocardial scar. We have designed a pilot study in this regard which will help us assess
the feasibility of the scan protocol and provide data to power a larger study to assess the
diagnostic remit of Cardiac GSI scanning in the assessment of patients with high-risk of
significant coronary artery disease and myocardial scar.
| Status | Completed |
| Enrollment | 60 |
| Est. completion date | June 2016 |
| Est. primary completion date | June 2016 |
| Accepts healthy volunteers | No |
| Gender | Both |
| Age group | 50 Years and older |
| Eligibility |
Inclusion Criteria: Accuracy arm - Patients >50 years of age - Suspected or known coronary artery disease referred for ICA Stress perfusion arm - Patients >50 years of age - Suspected or established coronary artery disease referred for MPI-SPECT for assessment of inducible ischaemia Delayed enhancement arm - Patients >50 years of age - Referred for CMR for assessment of myocardial viability/scar Exclusion Criteria: Accuracy arm - Consent cannot be obtained - Patient BMI > 30 kg /m2 - NYHA class III or IV heart failure - Chronic total occlusion of target epicardial coronary artery - Urgent revascularisation required - Allergy to iodinated contrast or previous contrast induced nephropathy - Intolerance or contraindication to beta-blockers - Uncontrolled heart rhythm disturbances - 2nd or 3rd degree atrioventricular block - Estimated glomerular filtration rate <30ml/min within two weeks prior to procedure or chronic renal failure on dialysis - Pregnancy Stress perfusion arm - As above, plus: - Asthma (any) or intolerance to adenosine Delayed enhancement arm - As for Accuracy arm |
Allocation: Non-Randomized, Intervention Model: Parallel Assignment, Masking: Single Blind (Outcomes Assessor), Primary Purpose: Diagnostic
| Country | Name | City | State |
|---|---|---|---|
| United Kingdom | Plymouth Hospitals NHS Trust | Plymouth | Devon |
| Lead Sponsor | Collaborator |
|---|---|
| Plymouth Hospitals NHS Trust |
United Kingdom,
| Type | Measure | Description | Time frame | Safety issue |
|---|---|---|---|---|
| Primary | Feasibility - Assessment of rates of recruitment, acceptability of the procedure to patients, ease of CT acquisition | Assessment of rates of recruitment, acceptability of the procedure to patients, ease of CT acquisition. This pilot study will add to this assessment with specific information about the diagnostic performance of the novel scanning technique: Are images of sufficient quality to be diagnostic? Is diagnosis likely to be non-inferior to current comparable techniques, sufficient to justify a formal study? |
4 months | No |
| Secondary | radiation burden of the Cardiac GSI techniques | The Discovery CT750 HD scanner uses a new image reconstruction technique called Adaptive Statistical Iterative Reconstruction (ASIR). ASIR uses more complex mathematical modelling for image reconstruction, thus reducing the need for statistical assumptions and reducing image noise and artefact. It also requires the less raw data and thus significantly less radiation dose. Studies suggest that using ASIR can achieve up to 40% dose reduction compared to Filtered Back Projection (FBP). However, the effect of ASIR and radiation dose reducing algorithms on image quality and accuracy has not been assessed and the difference in image quality and artefact suppression using the new technology remains to be established before its widespread dissemination into clinical practice. |
4 months | No |