No differences in serum concentrations of the measured cytokines: TNF-alpha, its soluble receptors 1 and 2 (sTNFR1 and 2), IL-10, high sensitivity C-reactive protein (hsCRP) and N-terminal-pro-B-type natriuretic peptide (NT-proBNP was measured in plasma) were found when right ventricular dysfunction due to CTEPH and left ventricular dysfunction due to chronic heart failure were compared [51]. This evidence concerns the gene NPPB and congestive heart failure.