Abstract
Background and Aim
Increased oxidative stress is involved in the development of portal hypertension in cirrhosis. Our study aimed to assess the relationship between oxidative stress and hemodynamic parameters in cirrhotic patients.
Methods
Forty-two patients with viral cirrhosis and 24 normal controls were enrolled. Measurements of plasma levels of malondialdehyde (MDA), nitrite/nitrate (NOx), endotoxin, and activities of superoxide dismutase (SOD) were carried out in all subjects. Systemic and splanchnic hemodynamic measurements were carried out in cirrhotic patients.
Results
Plasma levels of MDA, endotoxin, and NOx were significantly higher in cirrhotic patients than in normal controls (900 ± 751 versus 226 ± 16 nM, P < 0.01; 62.0 ± 26.0 versus 14.8 ± 4.1 pg/mL, P < 0.01; 50.5 ± 22.6 versus 15.0 ± 9.2 nM, P < 0.01, respectively). Activities of SOD were significantly decreased in cirrhotic patients compared with in normal controls (2.62 ± 0.7 versus 6.8 ± 0.4 U/mL). Further, plasma levels of MDA in cirrhotic patients were significantly positively associated with hepatic venous pressure gradient (HVPG) (r = 0.35; P = 0.025), wedge hepatic venous pressure (WHVP) (r = 0.42; P = 0.007), and hepatic sinusoid resistance (HSR) (r = 0.33; P = 0.033). Plasma MDA levels also correlated positively with plasma endotoxin (r = 0.71, P < 0.001) and NOx (r = 0.55, P < 0.001) levels in the cirrhotic patients. Multiregression analysis showed that the independent and strongest factors to predict HVPG, WHVP, and HSR are plasma levels of NOx, MDA, and endotoxin, respectively.
Conclusion
This study suggests a close interaction among MDA, endotoxin, and NOx and that these substances are also associated with hemodynamic derangement in cirrhosis.
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Acknowledgments
The authors gratefully acknowledge Peng Chi-Yi and Judy Huang for their excellent technical assistance. This work was supported by grants NSC96-2314-B-075-018-MY3 and NSC96-2314-B-075-035 from the National Science Council of the Republic of China, Taiwan and grants V96C1-005 and VGH96B1-001 from the Taipei Veterans General Hospital, Taipei, Taiwan.
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Kuei-Chuan Lee and Ying-Ying Yang contributed equally to this work.
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Lee, KC., Yang, YY., Wang, YW. et al. Increased Plasma Malondialdehyde in Patients with Viral Cirrhosis and Its Relationships to Plasma Nitric Oxide, Endotoxin, and Portal Pressure. Dig Dis Sci 55, 2077–2085 (2010). https://doi.org/10.1007/s10620-009-0990-2
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DOI: https://doi.org/10.1007/s10620-009-0990-2