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Published on: October 12, 2017
Plasma Homocysteine and Cardiovascular Organ Damage in a Population with a High Prevalence of Risk Factors
Michaela Kozakova1, Carmela Morizzo2, Giuseppe Penno1
1Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy.
Insights
Plasma homocysteine (Hcy) is linked to left ventricular hypertrophy (LVH), a condition associated with cardiovascular events (CVEs). This suggests LVH may be a key link between Hcy and cardiovascular risk.
Area of Science:
- Cardiovascular Medicine
- Biochemistry
- Clinical Research
Background:
- Plasma homocysteine (Hcy) is a potential risk factor for cardiovascular disease (CVD).
- The direct impact of Hcy on the cardiovascular system and its mediation by established risk factors remain unclear.
- This study investigates the relationship between Hcy and cardiovascular organ damage.
Purpose of the Study:
- To evaluate cross-sectional relationships between plasma Hcy and indices of cardiovascular organ damage.
- To determine the association between these indices and a history of cardiovascular events (CVEs).
Main Methods:
- 269 patients with high prevalence of diabetes, dyslipidemia, and hypertension were studied.
- Measurements included carotid intima-media thickness, ankle-brachial index (ABI), reactive hyperemic index, carotid-femoral pulse wave velocity (cfPWV), left ventricular (LV) mass, and cardiac index.
- Plasma Hcy levels were analyzed in relation to these cardiovascular parameters and history of CVEs.
Main Results:
- Plasma Hcy levels were independently associated with LV mass and ABI.
- Significantly higher Hcy levels were observed in patients with LV hypertrophy (LVH) and ABI < 0.90.
- LVH was the only marker of CV organ damage associated with a history of CVEs.
Conclusions:
- Hcy is independently associated with LV mass.
- LVH is independently associated with a history of CVEs.
- LVH may serve as a pathophysiologic link between Hcy and cardiovascular risk.
Purpose:
It is unclear whether plasma homocysteine (Hcy) has a direct noxious impact on the cardiovascular (CV) system or whether its association with cardiovascular events (CVEs) is mediated by established risk factors. To explore the role of Hcy in CV impairment, the study evaluated cross-sectional relationships between plasma Hcy and indices of CV organ damage together with the associations of these indices with the history of CVEs.
Methods:
In 269 patients with a high prevalence of diabetes, dyslipidemia, and hypertension, the carotid intima-media thickness, ankle-brachial index (ABI), reactive hyperemic index, carotid-femoral pulse wave velocity (cfPWV), left ventricular (LV) mass, and cardiac index were measured.
Results:
132 patients had carotid plaque, 31 ABI < 0.90, 126 endothelial dysfunction, 66 increased cfPWV, 125 LV hypertrophy (LVH), 153 decreased cardiac index, and 115 a history of CVEs. Plasma Hcy levels were related to LV mass and ABI, after adjustment for covariates and creatinine. Significantly higher Hcy levels were found in patients with LVH (8.5 [4.4] vs 7.6 [2.8] μmol/L; adjusted P = .001) and ABI < 0.9 (10.4 [3.8] vs 7.9 [3.4] μmol/L; adjusted P = .001) than in those with LV mass and ABI within limits. Hcy levels were comparable between patients with and without carotid plaques, increased arterial stiffness, impaired endothelial, and LV pump function. Within markers of CV organ damage, only LVH was associated with a history of CVEs.
Conclusion:
This study demonstrated an independent association between Hcy and LV mass as well as between LVH and a history of CVEs and suggests that LVH may represent 1 of the pathophysiologic links between Hcy and CV risk.
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