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Responses of vasoactive hormones in congestive cardiac failure
C I Johnston1, L F Arnolda, K Tsunoda
1Department of Medicine, University of Melbourne, Austin Hospital, Heidelberg, Victoria, Australia.
Insights
Neurohumoral responses in heart failure, including vasopressin and atrial natriuretic factor, impact cardiac function. Understanding these vasoactive hormones is key to managing congestive cardiac failure.
Area of Science:
- Cardiology
- Endocrinology
- Physiology
Background:
- Congestive cardiac failure (CCF) activates neurohumoral systems, increasing peripheral resistance and fluid retention.
- These responses initially aid perfusion but worsen cardiac decompensation by increasing afterload and workload.
- Established treatments target the renin-angiotensin-aldosterone system and catecholamines.
Purpose of the Study:
- To review the role of vasoactive hormones in congestive cardiac failure.
- To explore the controversial role of vasopressin and the established role of atrial natriuretic factor.
- To present evidence supporting the pathophysiological roles of vasopressin and atrial natriuretic factor in CCF.
Main Methods:
- Literature review of neurohumoral responses in heart failure.
- Analysis of experimental evidence on vasopressin and atrial natriuretic factor.
- Summary of current understanding of vasoactive hormones in CCF.
Main Results:
- Vasopressin exhibits vasoconstrictor and fluid-retaining properties in heart failure.
- Atrial natriuretic factor promotes natriuresis, diuresis, and vasodilation, counteracting detrimental neurohumoral effects.
- Elevated plasma atrial natriuretic factor in heart failure may limit adverse neurohumoral responses.
Conclusions:
- Vasopressin and atrial natriuretic factor play significant pathophysiological roles in congestive cardiac failure.
- Further understanding of these hormones is crucial for developing effective heart failure therapies.
- Targeting these vasoactive systems offers potential therapeutic strategies for CCF.
Abstract:
Congestive cardiac failure causes activation of various neurohumoral responses that increase total peripheral resistance and promote salt and water retention. These effects increase blood pressure and organ perfusion in the short term, but ultimately cause further cardiac decompensation by increasing ventricular afterload and cardiac work. The role of the renin-angiotensin-aldosterone system and the catecholamines is partially understood, and blockade of these systems as a treatment of heart failure is now established. The role of vasopressin in heart failure is more controversial, but there is now compelling evidence that vasopressin may have important vasoconstrictor actions in addition to its fluid retaining properties. Atrial natriuretic factor is a newly described cardiac hormone released from the atrium. Atrial natriuretic factor causes natriuresis, diuresis, vasodilatation, suppression of thirst, and suppression of both renin and aldosterone. These actions largely counteract the effects of the renin-angiotensin system and vasopressin. Plasma atrial natriuretic factor has been reported to be markedly elevated in human and experimental heart failure, and may act to limit the neurohumoral response to reduced cardiac output. This review summarizes our understanding of the vasoactive hormones and reports experimental evidence supporting a pathophysiological role for vasopressin and atrial natriuretic factor in congestive cardiac failure.