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Toward consistent definitions for preload and afterload.

J M Norton1

  • 1Department of Physiology and Pharmacology, University of New England, College of Osteopathic Medicine, Biddeford, Maine 04005, USA. jnorton@mailbox.une.edu

Advances in Physiology Education
|February 5, 2002
PubMed
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Confusing textbook definitions for cardiac preload and afterload can be clarified. New definitions using the Law of LaPlace provide a comprehensive understanding of ventricular wall stress.

Area of Science:

  • Cardiology
  • Physiology
  • Medical Education

Background:

  • Textbook definitions of cardiac preload and afterload vary, causing confusion for students and educators.
  • Commonly used approximations like end-diastolic volume and aortic pressure are incomplete representations.
  • A need exists for clear, comprehensive definitions of these critical hemodynamic concepts.

Purpose of the Study:

  • To develop straightforward and comprehensive definitions for cardiac preload and afterload.
  • To utilize the Law of LaPlace for a more accurate description of these terms.
  • To enhance understanding of cardiac pathophysiology and therapeutic interventions.

Main Methods:

  • Applying the Law of LaPlace to define preload and afterload.
  • Describing preload as passive ventricular wall stress at end-diastole.

Related Experiment Videos

  • Defining afterload as total myocardial wall stress during systolic ejection.

    • Main Results:

    • Preload is defined as factors contributing to passive ventricular wall stress at end-diastole.
    • Afterload is defined as factors contributing to total myocardial wall stress during ejection.
    • Incorporating "wall stress" into definitions clarifies cardiac mechanics.

    Conclusions:

    • Clearer definitions of preload and afterload can be established using the Law of LaPlace.
    • These refined definitions improve comprehension of cardiac function and disease.
    • Understanding wall stress is crucial for appreciating cardiac pathophysiology and treatment rationale.