Table 2 shows that blood levels of TC, BNP, and ADMA in the CHD and CHD-PAH groups were considerably higher than the control group (both P < 0.05), while serum BNP and ADMA levels in the CHD-PAH group were significantly higher than the CHD group (both P < 0.01). Here, NPPB is linked to pulmonary arterial hypertension.