Video Experimental Relacionado
Updated: Jul 18, 2026
08:05
Cardiac Response to β-Adrenergic Stimulation Determined by Pressure-Volume Loop Analysis
Published on: May 19, 2021
Los efectos hemodinámicos sostenidos de la levosimendana intravenosa se mantienen
Matti Kivikko1, Lasse Lehtonen, Wilson S Colucci
1Orion Pharma, Clinical Research, Espoo, Finland.
Circulation
|January 8, 2003
Resumen
La infusión de Levosimendan (Levo) mantiene mejoras hemodinámicas en pacientes con insuficiencia cardíaca durante 48 horas. Su metabolito activo, OR-1896, prolonga estos efectos incluso después de la interrupción del medicamento.
Área de la Ciencia:
- Cardiología Cardiología.
- Farmacología Farmacología.
- Medicina de cuidados críticos Medicina de cuidados críticos.
Sus antecedentes:
- La infusión a corto plazo de levosimendan (Levo) mejora la hemodinámica en la insuficiencia cardíaca descompensada.
- Los metabolitos de Levosimendan tienen vidas medias largas y son hemodinámicamente activos.
- El estudio investigó los efectos hemodinámicos sostenidos de Levo durante y después de la infusión.
Objetivo del estudio:
- Para evaluar los efectos hemodinámicos sostenidos de levosimendan durante la infusión a largo plazo.
- Para determinar si los efectos hemodinámicos persisten después de la interrupción de levosimendan.
- Evaluar el papel de los metabolitos activos en la acción prolongada del fármaco.
Principales métodos:
- Los pacientes con insuficiencia cardíaca descompensada recibieron levosimendan intravenoso escalante o placebo durante 6 horas.
- Los pacientes tratados con levosimendan continuaron con el medicamento abierto durante 24 horas, luego fueron asignados al azar a 24 horas más de levosimendan o placebo.
- Se monitorearon los parámetros hemodinámicos, el levosimendan y las concentraciones plasmáticas del metabolito activo OR-1896.
Principales resultados:
- Los efectos hemodinámicos se mantuvieron a las 48 horas tanto en los grupos de continuación como en los de retirada de levosimendan.
- Las concentraciones plasmáticas de levosimendan disminuyeron rápidamente después de la retirada, pero los niveles del metabolito activo OR-1896 se mantuvieron similares y aumentaron significativamente.
- El metabolito activo OR-1896 aumentó de 3,5 a 4 veces en 48 horas en ambos grupos.
Conclusiones:
- Los efectos hemodinámicos de Levosimendan se mantienen durante la infusión de 48 horas y persisten durante 24 horas después de la infusión.
- El metabolito activo OR-1896 aumenta después del cese de levosimendan, lo que podría explicar los beneficios hemodinámicos prolongados.
- Esto sugiere una acción terapéutica sostenida de levosimendan en el manejo de la insuficiencia cardíaca.
Videos de Conceptos Relacionados
01:29Blood Flow
Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.
01:26Heart Failure Drugs: Inotropic Agents
Positive inotropic agents are commonly used as the first line of treatment for heart failure. One such agent is digoxin, derived from the genus Digitalis, which has been known for centuries but effectively utilized since 1785. However, these cardiac glycosides can have potentially toxic effects due to their mechanism of action, which involves inhibiting Na+/K+-ATPase and increasing contractility. Digoxin is absorbed orally and distributed in various tissues, including the CNS. It has a long...
01:27Regulation of Stroke Volume
The regulation of stroke volume, which is the amount of blood the heart pumps out during each heartbeat, is critical for maintaining a healthy circulatory system. Stroke volume is influenced by three main factors: preload, contractility, and afterload.
Preload refers to the degree of stretch on the heart before it contracts. It's analogous to the stretching of a rubber band; the more it's stretched, the more forcefully it snaps back. This concept is encapsulated in the Frank-Starling law of the...
Preload refers to the degree of stretch on the heart before it contracts. It's analogous to the stretching of a rubber band; the more it's stretched, the more forcefully it snaps back. This concept is encapsulated in the Frank-Starling law of the...
01:26Imbalances in Cardiac Output
The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send blood...
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send blood...
01:17Autoregulation of Blood Flow
Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.
01:22Cardiac Output II: Effect of Stroke Volume on Cardiac Output
Cardiac output (CO), the amount of blood the heart pumps per minute, is a parameter in cardiovascular physiology determined by stroke volume and heart rate. Stroke volume, the amount of blood pushed from one of the ventricles per heartbeat, is influenced by preload, afterload, and contractility.
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...