The SMART-ORACLE Study

UMC Utrecht

Status: Unknown

Conditions: Hypertension; Coronary Artery Disease; Stroke; Diabetes Mellitus, Type 2; Peripheral Arterial Disease

Study type: Observational

Funder types: Other

Identifiers

NCT01932671

NL36828.041.11

Details and patient eligibility

About

After having had a first cardiovascular event, there is a considerable risk of developing a subsequent event. Only recently, a risk prediction model was developed for this group of patients. Imaging techniques such as the coronary artery calcium score and contrast-enhanced computed tomography (CT) of the coronary and carotid arteries could be able to add improve this model. Imaging may further improve the prediction of future manifestations of arterial disease and personalize disease monitoring and treatment.

Full description

Patients with a prior cardiovascular event exhibit an elevated risk for subsequent cardiovascular events. The Second Manifestation of Arterial Disease Study (SMART) has recruited over 10,000 patients since 1996 with clinically manifest cardiovascular disease in a multidisciplinary single center study involving primary care physicians, cardiologists, neurologists, vascular surgeons, vascular medicine specialists and radiologists. Within this study a prediction model was developed to accurately estimate the risk for new cardiovascular events. It is now possible to acquire high-quality motion-free computed tomography (CT) images of the coronary and carotid arteries. Imaging biomarkers extracted from these images may further improve the prediction of future manifestations of arterial disease and personalize disease monitoring and medical care.

The SMART-ORACLE study is a prospective, single center, observational cohort study aiming to include 1500 patients. The primary aim is to identify predictors of future cardiovascular events. Eligible patients will be selected via the recruitment of the original SMART study. Patients participating in the SMART-ORACLE study will undergo calcium scoring in multiple cardiovascular beds and contrast-enhanced CT-scans of the coronary and carotid arteries in addition to the regular SMART investigations. Patients with renal dysfunction will be either excluded from the study or will receive pre-hydration (depending on eGFR) to minimize the risk of contrast nephropathy. Follow-up with questionnaire-based assessment will take place every 26 weeks until death of participant or end of the SMART study, asking participants about possible new cardiovascular events. Endpoints will be adjudicated by a committee of three experts. The aim is to collect 170 future events.

The main analysis will consist of Cox proportional hazard analysis. Imaging biomarkers will be added to the existing prediction model to assess their (independent) discriminatory capacity for future events. The c-statistic will be used to measure the discrimination of each model. Net reclassification improvement tables will be constructed to evaluate the added value of imaging markers in terms of reclassification. Based on a one-year-occurrence rate of subsequent cardiovascular events in the current SMART population database of 2.6%, about 6500 person years of follow-up are needed to obtain the adequate number of endpoints.

Enrollment: 1,500 estimated patients

Sex: All

Ages: 18+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• History of cardiovascular event (coronary carter disease, cardiovascular disease, transient ischemic attack, minor stroke peripheral artery disease , abdominal aortic aneurysm)
• Diabetes Mellitus type 2
• Hypertension (Blood pressure>140/90 mm Hg)

Exclusion criteria

• Known renal failure (defined as eGFR <46 ml/min/1.73 m2 estimated based on the modification of diet in renal disease (MDRD) formula)
• Previous allergic reaction to contrast, necessitating medical intervention
• Other contra-indication for CT-scanning (e.g. pregnancy, acute hypotension (<100 mm Hg systolic), clinical instability)
• Prior exposure to ionizing radiation for scientific purposes without advantage for the patient

Trial design

1,500 participants in 1 patient group

SMART

Description:

The SMART (Second Manifestation of ARTerial disease) cohort comprises patients at high-risk for or who have clinically manifest cardiovascular disease, including transient ischemic attack, cerebrovascular disease, peripheral artery disease, aneurysma aorta abdominalis, myocardial infarction, coronary ischemia for which coronary intervention is required, renal artery stenosis, diabetes mellitus, hyperlipidemia, hypertension, patients diagnosed with human immunodeficiency virus, pre-eclampsia, HELLP syndrome, abruption placentae and Intrauterine growth restriction in medical history. Participants are re-invited after 4 years for a second screening. This screening is performed to study the progression of atherosclerosis and evaluate the effects of the advice of the multidisciplinary team.