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Left atrial transport function

J J Leonard, J Shaver, M Thompson

    Transactions of the American Clinical and Climatological Association
    |January 1, 1980
    PubMed
    Summary
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    The left atrial booster pump increases left ventricular stroke volume by up to 25%. However, its contribution to steady-state cardiac output is not a primary determinant, questioning the routine use of complex A-V sequential pacing.

    Area of Science:

    • Cardiology
    • Physiology

    Background:

    • The left atrial booster pump action significantly enhances left ventricular stroke volume.
    • This function is crucial even with increased resistance to ventricular filling, as seen in aortic and mitral stenosis.

    Purpose of the Study:

    • To evaluate the significance of atrial function in determining cardiac output.
    • To assess the long-term benefits versus risks of sequential A-V pacing.

    Main Methods:

    • Analysis of cardiac output changes after restoring normal sinus rhythm from atrial fibrillation.
    • Review of data on sequential A-V pacing effects on stroke volume.

    Main Results:

    • Measuring atrial function by cardiac output changes post-rhythm restoration yields inconsistent results.

    Related Experiment Videos

  • Sequential A-V pacing may offer temporary stroke volume increases but not necessarily sustained cardiac output augmentation.
  • Permanent A-V sequential pacing involves complex hardware and increased malfunction risks.

    • Conclusions:

    • Atrial function is not a primary determinant of steady-state cardiac output.
    • The increased risks associated with complex sequential A-V pacing are not justified without strong evidence of atrial contribution importance in specific patients.