Jeon W, et al. - Researchers determined if aortic knob width (AKW) can represent invasively measured aortic pulse pressure (APP). In patients who underwent invasive coronary angiography (ICA) for the evaluation of coronary artery disease, the AKW (defined as the perpendicular length from the lateral margin of the main bronchus to the most prominent edge of the aortic knob on chest radiography), as well as APP, was measured. Greater AKW on chest radiography was found to be independently predictive of increased APP in patients undergoing elective ICA. Overall, AKW was found to have utility as a simple surrogate marker of APP.