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Related Concept Videos

Heart Valves01:16

Heart Valves

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The human heart is a complex organ with an intricate system of valves that regulate blood flow. There are two main types of valves: atrioventricular (AV) valves and semilunar valves.
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Cardiac Cycle01:29

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The cardiac cycle refers to the sequence of events that occur in the heart from the beginning of one heartbeat to the next. It's characterized by alternating periods of contraction (systole) and relaxation (diastole) of the heart muscles.
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IntroductionThe mitral valve, one of the heart's four valves, regulates blood flow. These valves have flaps that open and close to direct blood properly through the heart and body. During each heartbeat, the flaps open for blood to pass through and seal shut to prevent backflow. Specifically, the mitral valve opens to allow blood flow from the heart's upper left chamber to the lower left chamber. It then closes securely as the lower left chamber contracts to pump blood to the body, preventing...
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Mitral Regurgitation I: Introduction01:20

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Mitral regurgitation is characterized by the backward circulation of blood from the left ventricle to the left atrium during systole, a phase of the cardiac cycle when the heart contracts and pumps blood out of the chambers. This abnormal flow occurs primarily due to the dysfunction of the mitral valve or its supporting structures, which include the mitral leaflets, chordae tendineae, annulus, and papillary muscles.Etiology and Mechanisms:Primary Mitral Regurgitation: This type arises from...
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Mitral Stenosis I: Introduction01:22

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Mitral Valve Stenosis (MVS) is a heart condition where the mitral valve narrows, impeding blood circulation from the left atrium to the left ventricle. The etiology and pathophysiology of this condition are multifaceted, leading to a cascade of cardiovascular complications.Causes of Mitral Valve StenosisRheumatic Heart Disease: It is the main cause of mitral valve stenosis, particularly in developing nations. This condition arises from rheumatic fever, an inflammatory illness resulting from...
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Aortic Regurgitation I: Introduction01:15

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IntroductionAortic regurgitation is characterized by the backward flow of blood from the aorta into the left ventricle during diastole and arises from the improper closure of the aortic valve. This condition results in left ventricular volume overload and can stem from both acute and chronic etiologies, each contributing uniquely to the disease's progression and symptomatology.Acute and Chronic CausesAcute aortic regurgitation often results from events that suddenly impair the integrity of the...
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Inertia-Driven Mitral and Aortic Valves: The Isovolumic Myth.

Neil B Ingels1, Matts Karlsson2, Morten O Jensen3

  • 1Adjunct Professor; Department of Biomedical Engineering, University of Arkansas, Fayetteville, Arkansas.

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|December 24, 2025
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Summary

The Wiggers Diagram, a century-old model of the cardiac cycle, is challenged by new research. Findings show isovolumic periods are mythical, and valve function is driven by inertial flow, not just pressure.

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Area of Science:

  • Cardiovascular Physiology
  • Cardiac Mechanics
  • Hemodynamics

Background:

  • The Wiggers Diagram has been the standard for teaching cardiac cycle phases for 100 years.
  • Direct testing of the Wiggers Diagram's concepts on intact, beating hearts has been lacking.

Purpose of the Study:

  • To directly test the validity of the Wiggers Diagram's concepts of the cardiac cycle.
  • To investigate the mechanisms of heart valve operation in vivo.

Main Methods:

  • Utilized in vivo sheep datasets recording left ventricular and aortic pressures and flows.
  • Employed simultaneous 4-D coordinate tracking of radiopaque markers for hemodynamic synchronization and anatomical landmark analysis.

Main Results:

  • The Wiggers Diagram was not supported by the data; consistent isovolumic periods were absent.
  • Mitral valve closure occurred variably during left ventricular pressure rise.
  • Aortic valve closure and mitral valve opening were simultaneous at the end of systolic pressure drop.

Conclusions:

  • Heart valve function is driven by inertial flow, not solely by pressure differences.
  • The concepts of isovolumic contraction and relaxation periods are redefined as mythical.