Lancet
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Lancet
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The role of nitric oxide in heart failure is unknown. The high-capacity inducible isoform of nitric oxide synthase is present in the myocardium of patients with idiopathic dilated cardiomyopathy. ⋯ Vasodilation caused by increased nitric oxide may compensate for the vasoconstrictor effect of neurohumoral adaptions to heart failure. Alternatively, excess production may be detrimental to the heart by a direct negative inotropic effect.