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Mitral valve annular calcification — Clinical Guidelines

Overview

Mitral valve annular calcification (MAC) is a degenerative condition characterized by calcium deposits in the mitral valve annulus, often seen in elderly patients and associated with various underlying conditions such as chronic renal failure, rheumatic heart disease, and Fabry disease. 1 9 10

Diagnosis

Echocardiographic Features: Dense echo band beneath the posterior mitral leaflet with motion paralleling the left ventricular wall. 9 10

Imaging Techniques:

- Echocardiography: Most sensitive method for detection. - MRI: Useful for identifying liquefaction necrosis (LNMAC) with peripheral ring-type hyperenhancement. 3 - CT: Can assist in detailed anatomical assessment.

Radiographic Findings: Rarely visible on routine x-rays but may be seen on cinefluoroscopy in some cases. 10

Histological Confirmation: In cases like caseous calcification, histological examination confirms the presence of amorphous basophilic material and granulomatous infiltrates. 1

Management

Surgical Intervention:

- Double Valve Replacement: Recommended for extensive calcification involving both mitral and aortic annuli using techniques like the "half-and-half technique". 2 - Mitral Valve Replacement: Indicated in cases of severe mitral insufficiency or significant functional mitral stenosis. 8

Medical Management:

- Calcium Metabolism: Monitor and manage calcium levels, particularly in patients with chronic renal failure. 9 - Antithrombotic Therapy: Consider in patients with mobile ventricular thrombi to prevent embolic events. 4

Special Populations

Elderly: Commonly affected; MAC is predominantly seen in elderly patients. 9 10

Chronic Renal Failure: Increased risk and potential link to altered calcium metabolism. 1 9 10

Fabry Disease: Potential association with MAC, possibly due to altered calcium phosphate metabolism. 1

Coarctation of Aorta: Rare association noted, with potential implications for cardiac conduction disturbances. 6

Key Recommendations

Echocardiography is the primary diagnostic tool for detecting mitral annular calcification, aiding in differentiation between rheumatic and nonrheumatic etiologies. (Evidence: Strong 9 10)

Surgical intervention, including double valve replacement, should be considered for extensive calcification involving both mitral and aortic annuli. (Evidence: Moderate 2)

Monitor and manage calcium metabolism in patients with chronic renal failure to mitigate risk factors for MAC. (Evidence: Moderate 9)

Consider antithrombotic therapy in patients with mobile ventricular thrombi arising from MAC to prevent embolic events. (Evidence: Weak 4)

Evaluate for underlying conditions such as Fabry disease in younger patients with MAC, given potential links to altered calcium metabolism. (Evidence: Expert opinion 1)

References

1 Jorgenson KM, McMullen PD, Goldman BI, Jacob-Leonce M. Caseous Calcification of the Mitral Annulus: Calcified Toothpaste of the Heart. The American journal of forensic medicine and pathology 2025. link 2 Takahashi Y, Sasaki Y, Hattori K, Kato Y, Motoki M, Morisaki A et al.. Successful surgical treatment for total circumferential aortic and mitral annulus calcification: application of half-and-half technique. General thoracic and cardiovascular surgery 2016. link 3 Srivatsa SS, Taylor MD, Hor K, Collins DA, King-Strunk M, Pelberg RA et al.. Liquefaction necrosis of mitral annular calcification (LNMAC): review of pathology, prevalence, imaging and management: proposed diagnostic imaging criteria with detailed multi-modality and MRI image characterization. The international journal of cardiovascular imaging 2012. link 4 Sia YT, Dulay D, Burwash IG, Beauchesne LM, Ascah K, Chan KL. Mobile ventricular thrombus arising from the mitral annulus in patients with dense mitral annular calcification. European journal of echocardiography : the journal of the Working Group on Echocardiography of the European Society of Cardiology 2010. link 5 Giannoccaro PJ, Ascah KJ, Chan KL, Walley VM. Left atrial mass produced by extensive mitral annular calcification. Journal of the American Society of Echocardiography : official publication of the American Society of Echocardiography 1991. link80222-8) 6 Nair CK, Ahmed I, Sketch MH. Mitral annular calcification and coarctation of aorta. Clinical cardiology 1988. link 7 Teja K, Gibson RS, Nolan SP. Atrial extension of mitral annular calcification mimicking intracardiac tumor. Clinical cardiology 1987. link 8 Osterberger LE, Goldstein S, Khaja F, Lakier JB. Functional mitral stenosis in patients with massive mitral annular calcification. Circulation 1981. link 9 Meltzer RS, Martin RP, Robbins BS, Popp RL. Mitral annular calcification: clinical and echocardiographic features. Acta cardiologica 1980. link 10 Schott CR, Kotler MN, Parry WR, Segal BL. Mitral annular calcification. Clinical and echocardiographic correlations. Archives of internal medicine 1977. link

Mitral valve annular calcification