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Left ventricular function and geometry in juvenile mitral stenosis

J C Mohan1, R Agarwal, R Arora

  • 1Department of Cardiology, G.B. Pant Hospital, New Delhi, India.

Indian Heart Journal
|March 1, 1994
PubMed
Summary
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Juvenile mitral stenosis (MS) shows altered left ventricular geometry and increased preload, unlike adult MS. These changes in juvenile MS are adaptive responses to elevated afterload, indicating distinct pathophysiological processes.

Area of Science:

  • Cardiology
  • Pediatric Cardiology
  • Echocardiography

Background:

  • Mitral stenosis (MS) can present in both juvenile and adult populations.
  • Understanding differences in left ventricular (LV) function and geometry between juvenile and adult MS is crucial for management.
  • Two-dimensional echocardiography is a key tool for assessing cardiac structure and function.

Purpose of the Study:

  • To investigate differences in LV preload, afterload, contractile function, and geometry between juvenile and adult mitral stenosis.
  • To compare the adaptive responses of the left ventricle in different age groups with MS.

Main Methods:

  • Comparison of 36 children/adolescents with MS (Group 1) to 36 adults with MS (Group II) with similar mitral valve area.
  • Utilized two-dimensional echocardiography to assess LV ejection fraction, end-systolic wall stress, wall stress to end-systolic volume ratio, mass, end-diastolic volume, and sphericity index.

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  • Included comparison with normal control subjects.

    • Main Results:

    • Juvenile and adult MS groups had similar LV ejection fraction, end-systolic wall stress, wall stress to end-systolic volume ratio, and mass.
    • Juvenile MS patients exhibited greater end-diastolic volume and sphericity index, with a lower mass to volume ratio compared to adult MS.
    • Adult MS patients showed greater wall stress and lower ejection fraction compared to normal controls.

    Conclusions:

    • Juvenile mitral stenosis is characterized by significantly altered LV geometry and increased preload.
    • These alterations in juvenile MS appear to be compensatory adaptive processes in response to comparably elevated afterload.
    • Findings suggest distinct pathophysiological adaptations in juvenile versus adult mitral stenosis.