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Mitral annular calcification: clinical and echocardiographic features

R S Meltzer, R P Martin, B S Robbins

    Acta Cardiologica
    |January 1, 1980
    PubMed
    Summary

    Mitral annular calcification (MAC) is often linked to aging and stress on the heart. This study found lower calcium levels in patients with MAC, suggesting metabolic alterations may play a role in its development.

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    Area of Science:

    • Cardiology
    • Echocardiography
    • Pathophysiology

    Background:

    • Mitral annular calcification (MAC) is a common finding in echocardiography.
    • Its association with other cardiac conditions and underlying mechanisms requires further investigation.

    Purpose of the Study:

    • To analyze the two-dimensional echocardiographic (2DE) manifestations of MAC.
    • To investigate the relationship between MAC and idiopathic hypertrophic subaortic stenosis (IHSS).
    • To explore potential contributing factors to MAC pathogenesis, including age and calcium metabolism.

    Main Methods:

    • Retrospective analysis of 100 patient records with 2DE-diagnosed MAC.
    • Comparison of demographic and clinical data between patients with and without IHSS, and with and without MAC.

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  • Assessment of serum calcium levels in different patient groups.

    • Main Results:

    • 2DE showed MAC as a bright structure at the A-V groove and posterior mitral leaflet junction.
    • 16% of patients had MAC, with a 44% incidence in IHSS patients.
    • IHSS patients with MAC were significantly older than those without MAC.
    • Patients with MAC (both IHSS and non-IHSS) had lower serum calcium levels compared to controls.

    Conclusions:

    • MAC pathogenesis may involve degenerative changes from aging and increased stress on the mitral apparatus.
    • Altered calcium metabolism could contribute to calcium deposition in the mitral annulus.
    • MAC is associated with IHSS, older age, and potentially altered calcium levels.