bicuspid aortic valve problemsaortic valve problems in elderlysigns of aortic valve problemsaortic problemsaortic valve issuessymptoms of aortic valve failureaorta problems symptomssymptoms of heart valve stenosissymptoms of abdominal aorta problemsnarrowing of heart valvecalcium deposits in heart valvesaortic thrombus