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[Raised homocysteine plasma concentration in patients with heart failure: clinical significance]
E Vizzardi1, S Nodari, C Fiorina
1Dipartimento di Medicina Sperimentale e Applicata, Cattedra di Cardiologia, Università degli Studi di Brescia.
Insights
Elevated homocysteine levels are linked to heart failure severity. Higher homocysteine correlates with increased New York Heart Association (NYHA) class in heart failure patients.
Area of Science:
- Cardiology
- Biochemistry
- Vascular Medicine
Context:
- Hyper-homocysteinemia is an established risk factor for vascular diseases.
- Previous research indicates a link between homocysteine and heart failure.
- Data on the association between homocysteine and objective/subjective heart failure measures are limited.
Purpose:
- To investigate the association between plasma homocysteine levels and clinical/echocardiographic signs of heart failure.
- To analyze homocysteine levels in heart failure patients and correlate them with clinical-functional parameters like NYHA class and ejection fraction.
Summary:
- Plasma homocysteine levels were significantly higher in 123 heart failure patients compared to 85 healthy controls.
- Homocysteine levels positively correlated with NYHA functional class, age, and creatinine.
- No correlation was found between homocysteine and ejection fraction or other hemodynamic/metabolic parameters.
Impact:
- Plasma homocysteine levels are directly related to the severity of congestive heart failure, as indicated by NYHA class.
- This finding highlights a significant association between homocysteine and heart failure.
- Further research is needed to elucidate the causal or non-causal mechanisms underlying this relationship.
Unlabelled:
Elevated plasma levels of homocysteine is associated with increased risk of thrombotic and atherosclerotic vascular disease. Several studies have demonstrated that hyper-homocysteinemia is an indipendent risk factor for vascular disease and is associated to heart failure. However there are no data regarding the association between homocysteine and various objective as well as subjective measures of heart failure. We hypothesized that plasma homocysteine is associated with clinical and echocardiographic signs of heart failure. On this ground we have analysed levels of homocysteine in patients with heart failure and possible correlation between these levels and clinical-functional pattern (NYHA class and ejection fraction).
Methods:
Plasma homocysteine levels were determined in 123 patients with dilated cardiomyopathy (59 males, 64 females, mean age 67+/-10 years, mean EF 31+/-11% and mean NYHA 2.4+/-0.9, 47 idiopatic and 76 postischemic cardiomyopathy) and 85 healthy control subjects (homogeneus group for sex and age). Patients with chronic renal failure, vitamin B12 and folate deficiency or factors affecting homocysteine plasma levels were escluded from this study. Homocysteine levels were determined in coded plasma samples by immunoenzimatic methods.
Results:
Patients with heart failure had a higher homocysteine level (mcg/L) than control subjects (21.72+/-10.28 vs 12.9+/-6.86, p<0,001) both postischemic (20.89+/-9.6 vs 12.9+/-6.86, p<0,001) and idiopatic cardiomiopathy (23.0+/-11.2 vs 12.9+/-6.86, p<0,001). A significant correlation was observed between homocysteine and NYHA functional class (p<0,001), age (p<0,001), creatinine (p<0,001), colesterol (p<0,05) while no correlations were observed with hemodynamic (HR, BP), functional (ejection fraction) and other metabolic parameters (triglycerides). Serum homocysteine was lowest in control and increased with increasing NYHA class. In idiopatic cardiomiopathy the correlation between homocysteine and NYHA functional class, creatinine (p<0,001), fibrinogen (p<0,05) was confirmed; in postischemic cardiomiopathy a significant correlation with creatinine and NYHA class (p<0,001) and with triglycerides (p<0,05) was also found.
Conclusion:
Plasma homocysteine was directly related to NYHA class. This observation may underline the strong relations of plasma homocysteine to congestive heart failure. Further research is indicated to evaluate a causal or non-causal mechanism for this association.
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