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(Circulation. 2001;103:1522.)
© 2001 American Heart Association, Inc.
Clinical Investigation and Reports |
Bone Formation and Inflammation in Cardiac Valves
From the Department of Medicine, Cardiovascular Division (E.R.M., M.G.K., F.S.K.), Department of Pathology and Laboratory Medicine (F.G., C.R., R.Z.), and Department of Orthopedic Surgery (F.S.K.), University of Pennsylvania, School of Medicine, Philadelphia, Pa. Dr Gannon is currently affiliated with the Armed Forces Institute of Pathology, Washington, DC.
Correspondence to Emile R. Mohler III, MD, 432 PHI Bldg, 51 North 39th St, Philadelphia, PA 19104. E-mail emmd{at}mail.med.upenn.edu
Background—For nearly a century, the mechanical failure of calcified heart valves was attributed to a passive degenerative process. Recently, several case reports described bone formation in surgically excised heart valves and suggested an unexpected process of tissue repair.
Methods and Results—We studied the prevalence and pathology of heterotopic ossification in 347 surgically excised heart valves (256 aortic, 91 mitral) in 324 consecutive patients (182 men, 142 women; mean age 68 years) who underwent cardiac valve replacement surgery between 1994 and 1998. The valves were examined microscopically to determine the prevalence and features of bone formation and remodeling. Two hundred eighty-eight valves (83%) had dystrophic calcification. Mature lamellar bone with hematopoietic elements and active bone remodeling were present in 36 valves (13%) with dystrophic calcification. Endochondral bone formation, similar to that seen in normal fracture repair, was identified in 4 valves. Microfractures were present in 92% of all valves with ossification. Neoangiogenesis was found in all valves with ossification. Bone morphogenetic proteins 2 and 4 (BMP 2/4), potent osteogenic morphogens, were expressed by myofibroblasts and preosteoblasts in areas adjacent to B- and T-lymphocyte infiltration in valves where ossification was identified. Mast cells were present in calcified and ossified valves and were especially prominent in atheromatous regions.
Conclusions—Heterotopic ossification consisting of mature lamellar bone formation and active bone remodeling is a relatively common and unexpected finding in end-stage valvular heart disease and may be associated with repair of pathological microfractures in calcified cardiac valves.
Key Words: pathology • valves • inflammation • risk factors • stenosis
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