How is aortic stenosis characterized by left ventricle pressure volume loops?

Aortic Stenosis results from the aortic valve not opening completely which causes an increase in aortic resistance (afterload). The increase in aortic resistance causes left

ventricular pressure to increase greatly during ejection. As a result, end-systolic volume increases since less blood is pumped out of the ventricle. Since less blood is being pumped, end-systolic volume will also increase slightly resulting in a decrease in stroke volume. This triggers the Frank-Starling mechanism to activate which increases the force of contractions to maintain stroke volume. 

Aortic stenosis will cause PV loops to shift up and to the right.