Thoracic Aortic Aneurysm: New Clinical Guidelines and Specialized Care

Abstract Thoracic aortic aneurysms are frequently asymptomatic until the onset of acute aortic syndromes, which remain associated with high morbidity and mortality despite advances in surgical care. Historically, operative decision-making was driven primarily by absolute aortic diameter thresholds, most commonly 5.5 cm for the ascending aorta. However, landmark natural history studies have demonstrated that a substantial proportion of dissections occur below this threshold, challenging the adequacy of size alone as a determinant of surgical timing. Contemporary management has therefore shifted toward an individualized, risk-based approach that integrates patient characteristics, aneurysm growth kinetics, and institutional expertise. Recent guidelines codify this evolution, placing surgeons at the center of multidisciplinary aortic programs designed to prevent catastrophic events through timely and appropriately selected intervention.