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Figure 2 (A to C) Correlation of exercise parameters with brain natriuretic peptide (BNP) levels in primary pulmonary hypertension. (A) BNP vs. 6-min walk; r = –0.7; p < 0.001; (B) BNP vs. peak oxygen uptake (peak VO2); r = –0.61; p < 0.01; (C) BNP vs. World Health Organization (WHO) functional class, r = 0.79; p < 0.001. WHO class II vs. class III; p < 0.001.
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