NT-proBNP and Echocardiographic Parameters in Liver Cirrhosis: Correlations with Disease Severity

Abstract

Objective: Liver cirrhosis is associated with several cardiovascular abnormalities including a hyperdynamic splanchnic and systemic circulation related to arterial vasodilatation, finally leading to sodium retention, central hypovolemia, and increased intravascular volume. The objective of this study was to evaluate the relationship between NT-proBNP and echocardiographic parameters and liver disease stage in patients with cirrhosis. Method: This prospective study included 82 consecutive patients diagnosed with liver cirrhosis and 120 healthy, age- and sex-matched subjects. Standard transthoracic echocardiography was performed in all patients. Plasma NT-proBNP levels were determined. Liver disease severity in patients with cirrhosis was established by Child-Pugh class, MELD score and presence/absence of ascites. Results: Plasma levels of NT-proBNP were significantly higher in cirrhotic patients than the corresponding levels in the healthy subjects. NT-proBNP levels were also significantly elevated in Child-Pugh class C patients compared to those in class B and A. Left atrium (LA) size, diastolic function, left ventricular (LV) wall thickness, and LV ejection fraction were significantly altered in cirrhotic patients compared to controls. Advanced cirrhosis and high levels of NT-proBNP were significantly associated with increased LA volume and signs of cardiac diastolic dysfunction. We also observed significant differences between quartile groups of MELD score for the following: NT-proBNP, Troponin I, LA volume, left ventricle wall thickness, lateral wall and septum systolic tissue Doppler velocities and global longitudinal strain. Conclusion: NT-proBNP is increased in patients with cirrhosis and is correlated with the severity of liver disease as established by Child-Pugh class, MELD score, and the presence of ascites.