Coronary Computed Tomography Angiography: A New Paradigm for the Assessment of Coronary Artery Disease in the Brazilian Public Health System?

For decades, Cardiology sought noninvasive methods capable of identifying patients with significant coronary stenoses. From exercise testing to stress cardiovascular imaging, the paradigm of myocardial ischemia became established as the central element for prognostic stratification and decision-making in coronary artery disease (CAD). In recent years, however, technological advances in computed tomography have made it possible to noninvasively visualize coronary anatomy with a level of image quality previously achievable only with invasive coronary angiography. For many, however, this new method seemed difficult to reconcile with the prevailing paradigm, compounded by concerns that the anatomical identification of stenoses might trigger an oculostenotic reflex and a consequent increase in coronary interventions.

The evidence, however, followed a very different course. In patients without known CAD, large trials demonstrated that coronary computed tomography angiography (CCTA), when used as an initial diagnostic strategy, performed at least as well as functional testing and, in some studies, was associated with a reduction in cardiovascular events.^, The feared sustained increase in invasive coronary angiography and revascularization likewise failed to materialize. Subsequent analyses showed that a substantial proportion of the benefit resulted from changes in clinical management, particularly the greater use of preventive therapies after the identification of coronary atherosclerosis. In another clinical setting, among patients already referred for invasive angiography, additional assessment with CCTA was also shown to reduce invasive procedures and their complications.

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