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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 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 regurgitation (MR) is a valvular heart disorder in which the mitral valve fails to close tightly, allowing blood to leak backward into the heart. Understanding the clinical manifestations, assessment, diagnostic findings, and medical management of MR is crucial to effectively managing affected patients.Clinical Manifestations of Mitral RegurgitationMitral regurgitation can be acute or chronic, each presenting differently and requiring different approaches:1. Acute Mitral...
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High-frequency High-resolution Echocardiography: First Evidence on Non-invasive Repeated Measure of Myocardial Strain, Contractility, and Mitral Regurgitation in the Ischemia-reperfused Murine Heart
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Published on: July 9, 2010

Disminución paradójica de la regurgitación mitral isquémica con disfunción del músculo papilar: ideas de la

E Messas1, J L Guerrero, M D Handschumacher

  • 1Cardiac Ultrasound Laboratory, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA.

Circulation
|October 17, 2001
PubMed
Resumen

La disfunción del músculo papilar (MP) puede, paradójicamente, reducir la regurgitación mitral isquémica (MR) al mejorar la coaptación del folleto. Este hallazgo pone de relieve los factores geométricos en la RM y sugiere nuevos enfoques terapéuticos.

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Área de la Ciencia:

  • Fisiología cardiovascular fisiología cardiovascular.
  • Mecánica cardíaca La mecánica cardíaca.
  • Imágenes médicas de imágenes médicas.

Sus antecedentes:

  • La regurgitación mitral isquémica (MR) se ha atribuido tradicionalmente a la disfunción contráctil del músculo papilar (PM).
  • Las teorías actuales se centran en la distorsión del ventrículo izquierdo (LV) que causa el enlazamiento del folleto apical.
  • Sin embargo, la disfunción PM todavía se diagnostica comúnmente, lo que lleva a una reevaluación de su papel.

Objetivo del estudio:

  • Para investigar la hipótesis de que la disfunción contráctil PM puede paradójicamente disminuir MR.
  • Explorar el papel de la isquemia de base inferior en la modulación de la RM a través de cambios geométricos.

Principales métodos:

  • Circulación circumflex proximal ocluida en 7 ovejas, manteniendo la perfusión de PM.
  • Distancia de fijación del prospecto medida y volumen de eyección de LV utilizando ecocardiografía 3D.
  • MR evaluado restando el flujo de salida de LV del volumen de eyección de LV.

Principales resultados:

  • La isquemia inferior por sí sola indujo MR leve a moderado (25,2 + / -2,8% de fracción regurgitante) debido a la retracción de la punta de PM.
  • La adición de isquemia PM redujo el MR (5.2+/-0.3 a 1.4+/-0.3 mL) y la distancia de atadura.
  • La tasa de cepa de PM cambió de contracción a alargamiento, disminuyendo la tendencia del folleto.

Conclusiones:

  • La disfunción contráctil PM puede, paradójicamente, disminuir la MR en la isquemia inferobasal.
  • Este efecto está mediado por la reducción de la vinculación del prospecto y la mejora de la coaptación.
  • Los factores geométricos son cruciales en los mecanismos isquémicos de RM y las posibles estrategias terapéuticas.