IL6 and congestive heart failure: High serum levels of TNF-α sTNFR1, sTNFR2, NT-proBNP, and IL-10 in CTEPH and CHF patients. Correlations between sTNFR1, sTNFR2, IL-6, hs-CRP, and NT-proBNP and magnetic resonance imaging-derived RVEF.