Coronary artery disease investigated using 99mTc-tetrofosmin myocardial SPECT

Area of Science:

• Cardiology
• Nuclear Medicine
• Diagnostic Imaging

Background:

• Coronary artery disease diagnosis relies on myocardial single photon emission computed tomography (SPECT).
• The predictive value of low-dose technetium-99m-tetrofosmin (TcTF) stress SPECT for event-free survival is not well-established.
• This study evaluates normal stress SPECT findings for predicting future cardiac events.

Purpose of the Study:

• To determine if normal stress SPECT results predict event-free survival.
• To compare the negative predictive value of low-dose TcTF stress SPECT with thallium-201 chloride (TlCl) stress and rest SPECT.
• To assess the clinical utility of TcTF stress SPECT in screening for myocardial ischemia.

Main Methods:

• 222 patients with normal SPECT results were enrolled after screening 302 patients.
• Patients were randomized to either low-dose TcTF stress SPECT (n=150) or TlCl stress and rest SPECT (n=152).
• Follow-up was conducted for an average of 401 days, with ischemic cardiac events as the endpoint.

Main Results:

• No significant difference in cardiac event incidence between the TcTF and TlCl groups (0.9% vs. 0.0%).
• TcTF SPECT examinations were shorter (50 min) and less expensive (€425) compared to TlCl (280 min, €603).
• Both methods demonstrated clinically acceptable negative predictive values.

Conclusions:

• Low-dose TcTF stress SPECT has a negative predictive value comparable to TlCl stress and rest SPECT.
• Normal stress SPECT results using low-dose TcTF are reliable predictors of event-free survival.
• TcTF stress SPECT is a cost-effective and time-efficient tool for screening myocardial ischemia.