Cardiac cachexia - A syndrome with impaired survival and immune and neuroendocrine activation

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Item Type:	Review
Title:	Cardiac cachexia - A syndrome with impaired survival and immune and neuroendocrine activation
Creators Name:	Anker, S.D. and Coats, A.J.S.
Abstract:	Chronic heart failure (CHF) is a complex syndrome affecting many body systems. Body wasting (ie, cardiac cachexia) is a serious complication of CHF long known but little investigated. Although no specific diagnostic criteria have been established, we have suggested that cardiac cachexia be defined on the basis of the presence of documented nonintentional and nonedematous weight loss > 7.5% of the premorbid normal weight, occurring over a time period of > 6 months. Using this definition, 16% of an unselected CHF outpatient population was found to be cachectic. The cachectic state is predictive of impaired prognosis independently of age, functional disease classification, left ventricular ejection fraction, and peak oxygen consumption. The mortality in the cachectic cohort is 50% at 18 months. Analyzing body composition in detail, it has been found that patients with cardiac cachexia suffer from a general loss of fat tissue (ie, energy reserves), lean tissue (ie, skeletal muscle), and bone tissue (ie, osteoporosis). Cachectic CHF patients are weaker and fatigue earlier, which is due to both reduced skeletal muscle mass and impaired muscle quality. The pathophysiologic alterations leading to cardiac cachexia remain unclear, but initial cross-sectional studies have suggested that humoral neuroendocrine and immunologic abnormalities are linked, independently of established heart failure severity markers, to the presence of body wasting. Comparing the features of cachectic and noncachectic CHF patients with those of healthy control subjects, it is mainly the cachectic CHF patients who show raised plasma levels of epinephrine, norepinephrine, and cortisol; the highest plasma renin activity and aldosterone plasma concentrations; and the lowest plasma sodium level. Several studies have shown that cardiac cachexia is linked to raised plasma levels of tumor necrosis factor-ac. The degree of body wasting is strongly correlated with neurohormonal and immune abnormalities. The available evidence suggests that cardiac cachexia is a multifactorial neuroendocrine and metabolic disorder with a poor prognosis. A complex imbalance of different body systems may cause the development of body wasting.
Keywords:	Body Composition, Exercise, Heart Failure, Homeostasis, Skeletal Muscle, Neurotransmitter Agents, Nutritional Support, Prognosis, Syndrome, Wasting Syndrome
Source:	Chest
ISSN:	0012-3692
Publisher:	American College of Chest Physicians
Volume:	115
Number:	3
Page Range:	836-847
Date:	1 March 1999
Official Publication:	https://doi.org/10.1378/chest.115.3.836
PubMed:	View item in PubMed

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