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Myocardial catecholamine concentrations in dilated cardiomyopathy and heart failure of different origins
V Regitz1, B Leuchs, C Bossaller
1Abteilung für Innere Medizin/Kardiologie, Deutsches Herzzentrum Berlin, Germany.
European Heart Journal
|August 1, 1991
Summary
Heart failure significantly reduces myocardial norepinephrine levels, a key neurotransmitter. This reduction is consistent across different heart disease causes and correlates with impaired left ventricular function.
Area of Science:
- Cardiology
- Neuroscience
- Biochemistry
Background:
- Myocardial catecholamine levels are crucial in heart function and disease.
- Previous research suggests altered catecholamine levels in heart failure, but direct tissue measurements and their correlation with disease severity are less understood.
Purpose of the Study:
- To investigate myocardial catecholamine concentrations in patients with heart failure.
- To determine if these levels correlate with the severity of myocardial damage or the underlying disease aetiology.
Main Methods:
- Endomyocardial biopsies were obtained from patients with heart failure.
- Catecholamine concentrations were measured and normalized to non-collagen protein (NCP).
- Levels were compared between patient groups and with controls, and correlated with left ventricular ejection fraction (LVEF).
Main Results:
- Myocardial norepinephrine levels were significantly reduced in heart failure patients compared to controls (P < 0.0006).
- Norepinephrine levels were comparable in dilated cardiomyopathy and coronary/valvular heart disease groups.
- Lower norepinephrine levels were observed in patients with LVEF < 30% compared to those with LVEF 31-55% (P < 0.05).
- A strong correlation was found between myocardial norepinephrine and LVEF in dilated cardiomyopathy (P < 0.001, r = 0.70).
Conclusions:
- Reduced myocardial norepinephrine is a hallmark of heart failure, irrespective of its cause.
- The depletion of myocardial norepinephrine is associated with the severity of left ventricular dysfunction.
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