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Related Experiment Videos

The floppy mitral valve. Study on pathogenesis

E G Olsen, H K Al-Rufaie

    British Heart Journal
    |December 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    An enlarged mucinous layer in heart valves, the zona spongiosa, is a key factor in floppy valve syndrome. An inherent, prominent zona spongiosa predisposes individuals to this condition, especially with other valve function abnormalities.

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    Area of Science:

    • Cardiovascular Pathology
    • Histology
    • Medical Science

    Background:

    • The exact cause of floppy valve syndrome remains unclear.
    • Accumulation of mucinous material in valve leaflets is a common histological finding, supporting the valvular theory.
    • The normal presence and extent of the mucinous layer, zona spongiosa, in heart valves are often overlooked.

    Purpose of the Study:

    • To determine the normal range for the extent of the zona spongiosa in mitral valves.
    • To compare the zona spongiosa extent in normal valves versus those with floppy valve syndrome.
    • To investigate the role of the zona spongiosa in the pathogenesis of floppy valve syndrome.

    Main Methods:

    • Analysis of 50 excised mitral valves from deceased individuals without cardiac disease (age 2-89 years).

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  • Measurement of zona spongiosa thickness relative to total valve thickness.
  • Comparison with 50 patients clinically diagnosed with floppy valve syndrome.

    • Main Results:

    • A normal zona spongiosa extent was found to be 0-60% of valve thickness, unaffected by age.
    • 43 out of 50 patients with floppy valve syndrome exhibited an enlarged zona spongiosa (62-94%).
    • Seven patients with floppy valve syndrome had zona spongiosa measurements within the normal range.

    Conclusions:

    • An inherent, prominent zona spongiosa is a predisposing factor for floppy valve syndrome.
    • The increased mucinous material is likely a secondary change in the fibrosa of floppy valves.
    • Abnormalities in other components of normal valve function can exacerbate the risk associated with a prominent zona spongiosa.