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Current pharmacological treatment of congestive heart failure (CHF) addresses changes in neurohumoral stimulation or cardiac responsiveness to such stimulation. Yet, undiscovered neurohumoral changes, adaptive or maladaptive, may occur in CHF and suggest novel pharmacological treatment. Serotonin [5-hydroxytryptamine (5-HT)] enhances contractility and causes arrhythmias through 5-HT(4) receptors in human atrium and ventricle but not through rat ventricular 5-HT(4) receptors.

Appearance of a ventricular 5-HT receptor-mediated inotropic response to serotonin in heart failure