Related Experiment Videos
[The heart in hypertension. Cardiac protection and cardiac repair]
1Instituto Nacional de Cardiología Ignacio Chávez, INCICH, Juan Badiano No. 1, Col. Sección XVI, Tlalpan, 14080 México, D. F. trevethan@cardiologia.org.mx
Insights
Recent studies reveal how hypertension causes cardiac hypertrophy, fibrosis, and atherosclerosis. Blocking the Renin-Angiotensin-Aldosterone axis, particularly Angiotensin II, can counteract these effects and improve heart function.
Area of Science:
- Cardiovascular Medicine
- Renal Physiology
Context:
- Hypertension is a major risk factor for cardiovascular disease.
- Recent research has elucidated novel mechanisms linking hypertension to cardiac and vascular pathology.
Purpose:
- To summarize the current understanding of how the hypertensive process contributes to cardiac hypertrophy, fibrosis, and atherosclerotic plaque development.
- To highlight the role of the Renin-Angiotensin-Aldosterone axis in these pathological processes.
- To discuss therapeutic strategies targeting this axis for cardiovascular improvement.
Summary:
- The hypertensive process, significantly influenced by the Renin-Angiotensin-Aldosterone axis, drives cardiac hypertrophy, fibrosis, and atherosclerotic plaque destabilization.
- Angiotensin II, a key component of this axis, acts as a potent growth factor, promoting vascular smooth muscle cell hyperplasia, hypertrophy, and inflammation.
- Blocking the Angiotensin-Converting enzyme or AT1 receptors effectively counteracts these detrimental effects, leading to improved ventricular diastolic function.
Impact:
- Provides a comprehensive overview of hypertension-induced cardiovascular damage mechanisms.
- Identifies the Renin-Angiotensin-Aldosterone axis as a critical therapeutic target.
- Suggests that interventions targeting this axis can mitigate cardiac and vascular complications of hypertension.
Abstract:
Studies performed in the last five years have led to the knowledge of new mechanisms by which the hypertensive process produces hypertrophy and cardiac fibrosis, at the same time, favoring development of the atheroesclerotic plaque. The Renin-Angiotensin-Aldosterone axis is relevant by involved in the physiopathology of these alterations, not only by producing hyperplasia and hypertrophy of vascular smooth muscle cells or by increasing protein and DNA syntheses, mediated by Angiotensin II (by itself a potent Growth factor) but also through inflammatory processes exerted upon the vascular smooth muscle cells. These alterations (hypertrophy, fibrosis, inflammation, and destabilization of the atherosclerotic plaque) can now be counteracted by blocking the Angiotensin-Converting enzyme or its AT1 receptors with the consequent improvement in ventricular diastolic functions.