doi: 10.1161/hc4401.098515
(Circulation. 2001;104:2318.)
© 2001 American Heart Association, Inc.
Clinical Investigations and Reports |
Effects of Nitric Oxide Synthase Inhibition on Basal Function and the Force-Frequency Relationship in the Normal and Failing Human Heart In Vivo
From the Department of Cardiology, GKT School of Medicine, King’s College London and King’s College Hospital, London, UK, and the Department of Cardiology, University of Wales College of Medicine, Heath Park, Cardiff, UK (R.M.G.-M.).
Correspondence to Professor Ajay M. Shah, Department of Cardiology, GKT School of Medicine, Bessemer Road, London SE5 9PJ, United Kingdom. E-mail ajay.shah{at}kcl.ac.uk
Background— Nitric oxide (NO) exerts autocrine/paracrine effects on cardiac function, including alterations of the inotropic state. In vitro studies suggest that NO modulates the myocardial force-frequency relationship. Basal left ventricular (LV) contractility is depressed and the force-frequency relationship is blunted in human heart failure, and it is speculated that an increase in NO production is involved.
Methods and Results— We compared the effects of intracoronary NO synthase inhibition with NG-monomethyl-L-arginine (L-NMMA; 25 µmol/min) on basal LV function and the response to incremental atrial pacing in patients with dilated cardiomyopathy (n=11; mean age, 51 years) and in control subjects with atypical chest pain and normal cardiac function (n=7; mean age, 54 years). In controls, L-NMMA significantly reduced basal LV dP/dtmax (from 1826 to 1578 mm Hg/s; P<0.002), but had no effect on heart rate, mean aortic pressure, or right atrial pressure. Pacing-induced increases in LV dP/dtmax were unaltered by L-NMMA. In patients with dilated cardiomyopathy, L-NMMA had no effect on baseline LV dP/dtmax (from 1313 to 1337 mm Hg/s; P=NS). The blunted pacing-induced rise in LV dP/dtmax in these patients was unaltered by L-NMMA.
Conclusion— Endogenous NO has a small baseline positive inotropic effect in the normal human heart, which is lost in heart failure patients. NO does not significantly influence the force-frequency relationship in either the normal or failing human heart in vivo. Because this study was performed in patients with moderate heart failure, whether the findings apply to subjects with more severe heart failure requires further investigation.
Key Words: contractility • heart failure • myocardial contraction • nitric oxide • nitric oxide synthase
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