Graft Failure and Consequences of Coronary Artery Bypass Graft Surgery
Vein Graft Failure and Cardiovascular Consequences of Coronary Artery Bypass Graft Surgery
University of Edinburgh
70 participants
Mar 28, 2025
OBSERVATIONAL
Conditions
Summary
Coronary artery bypass graft (CABG) surgery is the commonest type of heart operation performed. During this, arteries or veins (termed 'grafts') are used to supply blood around blockages within the blood vessels that supply the heart. Unfortunately, these grafts can sometimes fail, and patients can also experience complications like heart attacks and strokes, after surgery. It is known that vein grafts are more likely to narrow over time. Additionally, treating vein graft failure is very challenging, as repeat surgery is riskier and procedures to stent open the veins can also fail. However, it is not fully understood why these complications occur. In this study, the investigators will use an imaging technique called a total-body Positron Emission Tomography (PET) scan. This uses special radioactive dyes (radiotracers) to look at what is happening inside vein grafts. With this technique, the investigators will also be able to see what is happening to the heart, brain and wider parts of the body after CABG surgery. This study will aim to recruit 70 participants in total (maximum 150). 40 (maximum of 120) of these participants will have recently undergone CABG surgery and received ≥1 vein graft. The remaining 30 will have undergone CABG surgery ≥5 years ago and will have symptoms suggestive of vein graft failure. The study will last a total of 36 months and will involve participants undertaking the following assessments: 1. Total-body Positron Emission Tomography and Computed Tomography (PET-CT) scan 2. Ultrasound scan of the heart (echocardiogram) 3. A blood test - up to four tablespoons (60 mL) of blood will be taken for immediate testing and the remainder will be stored for future ethically approved studies.
Eligibility
Inclusion Criteria7
- Cohort 1: Patients undergoing CABG surgery
- Males and females over 18 years of age
- Patients undergoing CABG surgery for multivessel coronary artery disease, who receive at least one saphenous vein graft
- Cohort 2: Patients with symptomatic saphenous vein graft vasculopathy
- Males and females over 18 years of age
- Patients who underwent CABG surgery ≥ 5 years prior to recruitment for multivessel disease and received 2 or more saphenous vein grafts
- Referred for invasive coronary angiography due to recurrent symptoms and with a high suspicion of graft vasculopathy
Exclusion Criteria7
- Patients with a life expectancy of \< 2 years
- Renal failure (estimated glomerular filtration rate \<30 mL/min/1.73 m2)
- Patients on immunosuppressive therapies
- Females of child-bearing age who are pregnant or breastfeeding,
- Known allergy or contraindications to iodinated contrast or radiotracer
- Patients who are unable to tolerate the supine position
- Patients who are unable to provide informed consent
Interventions
Patients undergo hybrid \[18F\]-GP1, \[68Ga\]-FAPI and \[68Ga\]-DOTATATE total body PET-CT imaging (Biograph Vision Quadra, Siemens) and contrast-enhanced electrocardiogram gated CT coronary angiogram (CTCA), within 28 days (+/- 28 days) of their CABG surgery and again at 12 month follow-up.
Patients undergo hybrid \[18F\]-GP1, \[68Ga\]-FAPI and \[68Ga\]-DOTATATE total body PET-CT imaging (Biograph Vision Quadra, Siemens) and contrast-enhanced electrocardiogram gated CT coronary angiogram (CTCA), prior to their clinical invasive coronary angiography.
Locations(1)
View Full Details on ClinicalTrials.gov
For the most up-to-date information, visit the official listing.
NCT06800430