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Neurohormones in patients with ischemic left ventricular dysfunction
H Pouleur1, C R Benedict, M F Rousseau
1Division of Cardiology, University of Louvain, Medical School, Brussels, Belgium.
Insights
Neurohormonal systems are activated in left ventricular dysfunction, impacting prognosis and disease progression. While ACE inhibitors improve outcomes, novel therapies are needed to address remaining neurohormonal activation and reduce high mortality rates.
Area of Science:
- Cardiology
- Pharmacology
- Biochemistry
Background:
- Neurohormonal systems are activated in patients with left ventricular dysfunction, even without overt heart failure symptoms.
- This activation indicates a non-steady cardiovascular state and identifies factors contributing to disease progression.
- Plasma neurohormone levels, especially norepinephrine, hold significant prognostic value.
Purpose of the Study:
- To investigate the role of neurohormonal activation in left ventricular dysfunction.
- To explore the therapeutic potential of targeting neurohormonal systems for improved patient outcomes.
- To identify limitations of current therapies and explore future treatment strategies.
Main Methods:
- Measurement of plasma neurohormones in patients with left ventricular dysfunction.
- Analysis of the prognostic value of specific neurohormone levels.
- Evaluation of therapeutic interventions targeting neurohormonal pathways, including ACE inhibitors and beta-blockers.
Main Results:
- Studies show activation of multiple neurohormonal systems in left ventricular dysfunction.
- Plasma norepinephrine levels are linked to prognosis.
- Angiotensin-converting enzyme (ACE) inhibitors and beta-blockers have demonstrated therapeutic success.
- Despite treatment, significant morbidity and mortality persist due to incomplete neurohormonal control and factors like endothelin-1.
Conclusions:
- Neurohormonal activation is a key feature of left ventricular dysfunction with prognostic implications.
- Current therapies like ACE inhibitors offer benefits but do not fully resolve the issue.
- Further research into novel therapeutic approaches, potentially including long-acting dihydropyridines, is warranted to improve outcomes in severe ischemic left ventricular dysfunction.
Abstract:
Measurements of plasma neurohormones in patients with left ventricular dysfunction are generally performed for research purpose rather than for diagnostic purpose or to guide therapy. These studies have shown that in patients with left ventricular dysfunction, several neurohormonal systems were activated, even in the absence of symptoms of congestive heart failure. This suggested that the cardiovascular system was not in a steady state and pointed out potential culprits for the progression of the disease. It has also been shown that the levels of several of these markers, particularly plasma norepinephrine, had an important prognostic value. Another value of neurohormonal studies obviously is the design of new therapeutic approaches aimed at improving symptoms and prognosis. In this respect, important therapeutic successes have been obtained with agents that interfere with the actions of some of these neurohormonal systems, such as with the use of the angiotensin-converting enzyme (ACE) inhibitors, particularly captopril and enalapril, and to a lesser extent, with beta-blockers. It can therefore be expected that, in the future, most patients with severe ischemic dysfunction will be treated with an ACE inhibitor. Nonetheless, neurohormonal control is not complete with these drugs; powerful vasoconstrictor forces, such as endothelin-1, remain activated, and an escape of angiotensin II from the control of ACE inhibition may exist. Thus, morbidity (e.g., progression towards congestive heart failure and angina pectoris) and mortality remain high despite treatment with ACE inhibitors. In the search for future improvements, the new generation of long-acting dihydropyridines is worth considering. Their afterload reducing action, coupled with powerful coronary vasodilation, might hypothetically delay the progression of ischemic LV dysfunction.(ABSTRACT TRUNCATED AT 250 WORDS)