Click on image to view larger version.

Figure 3 Mean Plasma proBNP Concentrations According to Severity of Dyspnea

Dyspnea was classified according to a slightly modified Medical Research Council (MRC) dyspnea scale. No dyspnea refers to MRC category 0, mild dyspnea to MRC category 1 to 2, and severe dyspnea to MRC category 3 to 5. proBNP = pro-B-type natriuretic peptide.