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Oncolog-Hematolog Nr. 35 (2/) by Versa Media - Issuu
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View in PDF Number of views: 64 Oxidative stress is involved in the pathophysiology of many chronic diseases, including heart failure. Oxidative stress is an imbalance between the production of reactive oxygen species ROS and the antioxidant defense. The overproduction of ROS can lead to cellular damage and eventually cellular death.

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This applies also in patients with chronic heart failure, who present a dramatic increase of oxidative stress associated with a pronounced decrease of the antioxidant defense mechanisms. Experimental animal studies have demonstrated the decrease of the activity of SOD, catalase and GPx in animal models with heart failure1,2.

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Furthermore, excessive ROS induce myocardial fibroblasts proliferation with cardiac remodeling. The promising results of experimental studies in animals with pancreatic cancer awareness month failure led to the hypothesis that oxidative stress may be a therapeutic target in patients with heart failure.

Oncolog-Hematolog Nr. 35 (2/) by Versa Media - Issuu

Clinical trials have studied the effects of antioxidant treatments in humans with heart failure. Treatment of oxidative stress can have different approaches: inhibition of oxidative stress producers, increase of endogenous antioxidant capacity, and increase of antioxidant capacity by administration of exogenous antioxidants, such as vitamin C, vitamin A, vitamin E, folic acid.

PCMC is more frequently found in males and it usually appears between the ages of 50 and Mendoza and Hedwig made the pancreatic cancer awareness month contemporary description of this eyelid-located tumour. Taking into consideration the rarity of this tumour, a diagnosis of certitude is difficult to establish until further investigations are made, in order to eliminate the primary malignant tumour with visceral location with mucine production that can metastasize at cutaneous level, as for example that of breast, gastrointestinal tract, lung, kidney, ovary, pancreas, or prostate.

Inhibition of xanthine oxidase by the administration of allopurinol or oxypurinol in patients with chronic heart failure is the most studied treatment 3,4.

Different trials have demonstrated that treatment with allopurinol or oxypurinol inhibitors of oxidative stress had beneficial effects on myocardial function, endothelial dysfunction, and led to the decreased levels of serum natriuretic peptides and improved left ventricle ejection fraction3,4.

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Other trials failed to demonstrate the beneficial effects of oxypurinol5. Other pancreatic cancer awareness month studies focused on the effects of increasing the antioxidant capacity in patients with heart failure, by administration of vitamin A, vitamin C, vitamin E or folic acid. Despite the initial enthusiasm regarding the effects of these antioxidants, a recent meta-analysis of 50 randomized trials on their cardiovascular effects, including almostpatients, has demonstrated that supplementation with vitamins papilloma uomo other antioxidants failed to demonstrate a decrease of the cardiovascular risk.

This strategy has been studied only in a few trials, but their results until now seem to be promising. Supplementation with NAC, which is a precursor of GSH, in patients with chronic heart failure can be a potential approach in order to decrease the oxidative stress secondary to myocardial injury6.

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Some studies have demonstrated that a few components of the gamma-glutamyl cycle pancreatic cancer awareness month synthetase, GPx, OPLAH are correlated with the risk of heart failure and its progression7. Therefore, the overexpression of these enzymes may have cardioprotective effects.

OPLAH is a cytoplasmic enzyme of the GSH cycle, with a central function in the gamma-glutamyl cycle and also with an important antioxidant function; its expression is decreased in heart failure.

Therefore, the stimulation of the expression and activity of OPLAH in patients with heart failure may play an important role for their prognosis.

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In conclusion, oxidative stress may play an important role in patients with chronic heart failure. Experimental studies have demonstrated the beneficial effects of therapies addressing the oxidative stress in animals.

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However, until now, these effects have not been fully demonstrated by clinical trials in humans. Further antioxidant strategies must be studied.

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