Chest Pain Clinical Trial
Official title:
Comparison of the Cost-Effectiveness of Coronary CT Angiography Versus Myocardial SPECT in Patients With Intermediate Risk of Coronary Heart Disease
The investigators aim to compare the cost-effectiveness of CCTA and myocardial SPECT in patients with intermediate pre-test probability of CHD. To this end, patients with intermediate pre-test probability of CHD will be randomized 1:1 to either CCTA and myocardial SPECT. The patients will be analyzed for cost and also, for outcome.
Coronary heart disease (CHD) is the leading cause of heart failure in Westernized countries
and accounts for one of the most common cause of mortality in Korea. More importantly, the
nation's health cost is being more and more spent on the treatment of CHD. Therefore,
selecting the right patients for intervention is becoming more and more important.
The diagnosis and treatment strategy of CHD relies on both anatomic and functional imaging.
First, there should be a significant narrowing of a segment of the coronary artery and
second, there must also be evidence of ischemia due to the lesion. As a consequence of the
recent, rapid development and distribution of the high-resolution computed tomography (CT),
physicians are referring more and more patients for anatomic imaging of the coronary
vasculature with coronary CT angiography (CCTA). CCTA has the advantage of imaging the
coronary arteries noninvasively that is nearly as exact as conventional, invasive coronary
angiography. However, CCTA also has the possibility of overdiagnosing CHD, especially
intermediate lesions. This can be important give the recent outcome of the FAME study
demonstrating the inferiority of relying on only anatomic diagnosis.
In contrast, myocardial single photon emission computed tomography (SPECT) has the advantage
of imaging ischemia more accurately, since it is more of a functional imaging than an
anatomical imaging. However, the sensitivity and specificity is less than 80%, which means
that a total of 20% of the patients can be false-negative or false-positive. In addition,
although it can demonstrate ischemia, it cannot provide where and how much the coronary
artery is stenotic.
Recently, van Werkhoven and Bax demonstrated that CCTA and myocardial SPECT may be
complementary. The study showed that patients with both abnormal CCTA and myocardial SPECT
results tend to be worse in terms of event-free survival than patients with either alone.
However, the nation's cost may be too burdenful if the patients are charged with both tests
together and thus, it is more critical to give information on the cost-effectiveness of both
of these tests.
In this study, we aim to compare the cost-effectiveness of CCTA and myocardial SPECT in
patients with intermediate pre-test probability of CHD. To this end, patients with
intermediate pre-test probability of CHD will be randomized 1:1 to either CCTA and
myocardial SPECT. The patients will be analyzed for cost and also, for outcome.
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Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Diagnostic
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