Pathology and etiology of 110 consecutively removed aortic valves

Abstract

Objectives: To study the pathology and determine the etiology and prevalence of aortic valve disease from surgically removed aortic valve specimens. Material and Method: All the native surgically excised aortic valves (AV) received from June 1997 to March 1999 (22 months) were studied macroscopically including cuspal measurements and microscopically. By preoperative echocardiographic and macroscopic studies, they were classified into functional disorders of predominant aortic stenosis (AS), aortic stenosis with regurgitation (AS-AR) and predominant aortic regurgitation (AR). The patients' medical records were reviewed and the clinical information was extracted. The etiology was determined according to the macroscopic, microscopic and clinical findings. Results: Among 110 AV (76 isolated AV and 34 with concomitant mitral valves from patients aged 15-96 years, mean age 47.54 years; male:female = 1.39:1) there were 25 AS (22.73%), 34 AS-AR (30.91%) and 51 AR (46.36%) cases. Eighty four (76.36%) were tricuspid, 16(14. 54%) were bicuspid and 10 were undetermined. Cuspal measurements of each disease were provided and compared. All AS specimens were related to moderate to severe calcification and causes included postinflammatory disease (14 cases, 56%; age range 38-67 years, mean age 53.29 years, male:female = 0.5.56:1), degenerative calcific change (11 cases, 44%, age range 56-76 years, male:female = 1.2:1; mean age 69 years of 5 tricuspid AV and 60.83 years of 6 bicuspid AV). In AS-AR, 29 cases (85.29%; mean age 47. 10 years; male:female = 1.23:1) were attributable to postinflammatory disease and 5 cases (mean age 70.20 years; male:female = 1.5:1) to degenerative calcific change. In pure AR, there were 21 cases (age range 15-65 years, mean age 29.76 years) of postinflammatory disease, 14 cases of infective endocarditis(IE) and post IE (age range 20-63 years, mean age 42.21 years; all 10 IE cases contained gram positive cocci), 1 case (age 55 years) of bicuspid calcific change, 8 cases of AV with dilated valve ring, 5 cases of miscellaneous causes and 2 cases of indeterminate etiology. Aschoff bodies were found in 3 AR cases. Four of 18 postinflammatory AS-AR and 4 of 14 postinflammatory disease AR cases had past history of rheumatic fever. One postinflammatory AS also had infective endocarditis from gram positive cocci without clinical sign. Severe degenerative calcific change had a higher incidence of underlying diabetes (3 of 15 cases, 20%), hypertension (8 of 14 cases, 57.14%) and dyslipoproteinemia (9 of 13 cases, 69.23%) in comparison with 3.37% (3/89) for diabetes, 9.09% (8/88) for hypertension and 30.99% (22/71) for dyslipoproteinemia in other AV diseases in combination. Conclusion: The three common causes of severe AV functional disorders were postinflammatory disease (58.18%), degenerative calcific change (15.45%) and IE-postIE (12.72%). Underlying diseases of severe degenerative. calcific change included hypertension, dyslipoproteinemia and diabetes. Macroscopic and microscopic examinations together with clinical information, echocardiographic findings and operative details are important in evaluating the etiology of valvular diseases especially in severely calcified specimens.