Multi-Center Evaluation of Feasibility of SPECT Measurement of Myocardial Blood Flow and Reserve

University of Ottawa Heart Institute

Status: Unknown

Conditions: Coronary Artery Disease

Study type: Observational

Funder types: Other; Industry

Identifiers

NCT03427749

20170797

Details and patient eligibility

About

Patients will be recruited from those referred to the local site's Diagnostic Imaging Department for SPECT myocardial perfusion imaging (MPI) ,who have an intermediate to high pre-test likelihood of disease (Diamond-Forrester criteria ≥ 30%) and are clinically indicated to have an MBF study.

Full description

Patients will be recruited from those referred to the local site's Diagnostic Imaging Department for SPECT myocardial perfusion imaging (MPI), who have an intermediate to high pre-test likelihood of disease (Diamond-Forrester criteria ≥ 30%) and are clinically indicated to have an MBF study. Research imaging will consist of a SPECT acquisition at the time of rest and stress radiotracer injection in addition to the standard (delayed) clinical stress/rest SPECT scan with 99mTc-tetrofosmin. This is an observational study; patients will be managed according to the standard clinical care of the local site. Where available, a CT scan will also be acquired for attenuation and/or scatter correction. Studies may be one day (rest/stress or stress/rest) or two day (rest and stress on separate days) All studies will be analyzed locally but the raw data will also be anonymized and forwarded to the core facility for reprocessing. Central processing will allow comparison between sites and the repeat processing will provide an estimate of inter-operator variability in the measurements. The core lab will also compare the relative perfusion from immediate and delayed imaging for image quality and diagnostic accuracy (visual and quantitative).

Enrollment: 180 estimated patients

Sex: All

Ages: 18+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Age ≥ 18 years old
• BMI ≤ 40 kg/m2
• Able and willing to comply with the study procedures
• Written informed consent
• Intermediate to high probability of CAD
• Suspected or known CAD on a stable medication regime

Exclusion criteria

• History or risk of severe bradycardia (heart rate < 50 beats per minute) not related to chronotropic drugs
• Known second- or third-degree AV block without pacemaker
• Dyspnea (NYHA III/IV), wheezing asthma or COPD
• Coronary artery bypass graft (CABG) surgery within 60 days prior to screening or within 45 days after consent (early revascularization)
• Percutaneous coronary intervention (PCI) within 30 days prior to screening or within 45 days following consent (early revascularization)
• Recent use of dipyridamole, dipyridamole-containing medications (e.g. Aggrenox)
• Known hypersensitivity to dipyridamole or adenosine
• Breastfeeding or pregnancy
• Claustrophobia or inability to lie still in a supine position
• Unwillingness or inability to provide informed consent