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Electron beam computed tomography: screening for coronary artery disease
1Saint John's Cardiovascular Research Center, Division of Cardiology, Harbor-UCLA Medical Center, Torrance, California 90502, USA.
Insights
Electron beam computed tomography (EBCT) effectively screens for coronary atherosclerosis by detecting coronary calcium. This noninvasive method identifies individuals at higher risk for cardiac events, aiding early intervention.
Area of Science:
- Cardiology
- Radiology
- Preventive Medicine
Background:
- Early detection of coronary atherosclerosis is crucial for reducing cardiac morbidity and mortality.
- Identifying at-risk populations before symptom onset is a key clinical goal.
Purpose of the Study:
- To evaluate the utility of Electron Beam Computed Tomography (EBCT) for screening asymptomatic individuals for coronary atherosclerosis.
- To assess EBCT's ability to detect and quantify coronary calcium as a marker for coronary artery disease (CAD).
Main Methods:
- Utilized EBCT, a noninvasive imaging technique combining speed and high density resolution.
- Focused on detecting and quantifying coronary calcium in asymptomatic populations.
- Assessed the diagnostic and prognostic significance of coronary calcium scores.
Main Results:
- Elevated coronary calcium scores (via EBCT) indicate a 6- to 35-fold increased risk of cardiac events.
- A negative EBCT scan is highly predictive of the absence of obstructive CAD.
- EBCT is noninvasive, requires no contrast, minimal patient preparation, and is technician-performed.
Conclusions:
- EBCT is a valuable, noninvasive tool for screening asymptomatic individuals for coronary atherosclerosis.
- Coronary calcium detection by EBCT has significant diagnostic and prognostic implications for future cardiac events.
- EBCT's efficiency and cost-effectiveness make it a potential primary screening method for occult CAD.
Abstract:
The need to detect coronary atherosclerosis early in its course has been well recognized by clinicians and epidemiologists for decades. The ability to identify populations with a greater prevalence of coronary disease prior to manifestation of illness would greatly reduce cardiac morbidity and mortality. Electron beam computed tomography (EBCT) uniquely combines the characteristics of speed and excellent density resolution that have led to a rebirth of interest in detecting coronary calcium as a means of screening asymptomatic populations for coronary atherosclerosis. Electron beam computed tomography is noninvasive and widely applicable. It can both detect and quantitate the presence of coronary atherosclerosis. A positive test has diagnostic and prognostic significance, predicting future cardiac events and the extent of atherosclerosis, including the probability of obstructive coronary artery disease (CAD). Multiple studies demonstrate a 6- to 35-fold increased risk of developing a cardiac event with elevated calcium scores. A negative test is highly predictive for excluding obstructive CAD. The cost ranges from $300 to $400, similar to that of an exercise treadmill test. Moreover, scanning for coronary calcium does not require injection of contrast medium, requiring no patient preparation or exercise; therefore, a CT technician can perform the study without supervision. The entire procedure takes < 10 min to perform. These features make EBCT a potential screening test for occult CAD in symptomatic and asymptomatic persons.