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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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Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...
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Mitral Valve Prolapse I: Introduction01:27

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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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Dynamic Equilibrium02:20

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A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...
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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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Mitral Valve Prolapse II: Assessment and Management01:22

Mitral Valve Prolapse II: Assessment and Management

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IntroductionA range of clinical features characterizes Mitral Valve Prolapse (MVP), but it is important to note that many individuals with MVP are asymptomatic and may remain so throughout their lives. For those who do exhibit symptoms, the following are the key clinical features:Palpitations: This is a common symptom where individuals feel an irregular or rapid heartbeat. Palpitations in MVP are often due to arrhythmias such as premature ventricular contractions or supraventricular...
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Related Experiment Video

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Standardized Technique of Aortic Valve Re-implantation for Valve-sparing Aortic Root Replacement
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Aortic valve opening and closure: the clover dynamics.

Emmanuel Lansac1, Hou-Sen Lim2, Yu Shomura2

  • 1Department of Cardiovascular Surgery, Institut Mutualiste Montsouris, Paris, France.

Annals of Cardiothoracic Surgery
|June 27, 2019
PubMed
Summary
This summary is machine-generated.

Aortic valve opening begins before ejection due to complex dynamics. The aortic valve adopts a clover shape at maximum opening during systole, informing surgical repair strategies.

Keywords:
Aortic valveanatomyaortic rootaortic valve repairphysiology

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Area of Science:

  • Cardiovascular Physiology
  • Cardiac Mechanics
  • Aortic Valve Dynamics

Background:

  • Systolic aortic root expansion is known to aid aortic valve opening.
  • Precise timing and mechanisms of aortic valve dynamics remain unclear.
  • High-fidelity sonometric measurements are crucial for detailed analysis.

Purpose of the Study:

  • To elucidate the timing and mechanisms of aortic valve opening and closure.
  • To characterize the geometric shape of the aortic valve during opening and closure.
  • To investigate the role of aortic root dynamics in valve function.

Main Methods:

  • Acute ovine model with high data sampling rate (200-800 Hz).
  • Implantation of 18 piezoelectric crystals to measure geometric changes.
  • Correlation of geometric changes with pressures and blood flow.

Main Results:

  • Aortic root expansion initiated leaflet separation prior to ejection (2.1% opening).
  • Aortic root divided into left ventricular (LV) and aortic compartments influencing dynamics.
  • Maximum opening revealed a truncated cone shape, becoming clover-shaped distally.

Conclusions:

  • Aortic valve opening is initiated pre-ejection, driven by LV, aortic root, and coronary dynamics.
  • The aortic valve exhibits a clover shape at peak systolic opening.
  • Understanding these mechanisms can guide more physiological surgical interventions.