Journal
CARDIOLOGY IN REVIEW
Volume 18, Issue 6, Pages 305-312Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/CRD.0b013e3181f493e3
Keywords
relaxin; vasodilator; acute heart failure
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Relaxin, a naturally-occurring hormone in the insulin family, was discovered to have a physiologic role in pregnancy. Named initially for its relaxing effect on the pubic ligament, relaxin receptors have since been found to be widely distributed in many organs in both males and females. Acting through multiple pathways, including the stimulation of gelatinases leading to activation of endothelin type B receptors and subsequently nitric oxide, relaxin has been shown to cause vasodilation. In animal models and studies in humans, relaxin has been shown to increase cardiac output and renal perfusion. Due to these effects, relaxin has been examined as a treatment for acute heart failure. The results of phase I and II trials have shown favorable clinical trends without any major adverse events, suggesting that relaxin has the potential to be an effective medication for acute heart failure in conjunction with or in place of current treatments.
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