Which finding occurs initially as the seventy of aortic stenosis progresses?

In the early stages of aortic stenosis, the left ventricle adapts to increased afterload by concentric remodeling, which is characterized by increased wall thickness without a proportional increase in chamber size. This adaptation helps normalize wall stress.

As the disease progresses, concentric hypertrophy develops with thickened walls and decreased compliance. Eccentric hypertrophy and global systolic dysfunction occur later with decompensation and ventricular dilation.

This progression is explained in the "Textbook of Clinical Echocardiography, 6e", Chapter on Left Ventricular Adaptations to Pressure Overload【20:365-370†Textbook of Clinical Echocardiography】.