Low risk | Intermediate risk | High risk | |
WHO FC | I/II | III | IV |
Six-minute walking distance (m) | >440 | 165 to 440 | <165 |
BNP (ng•L-1) | <50 | 50 to 300 | >300 |
NT-proBNP (ng•L-1) | <300 | 300 to 1400 | >1400 |
Right atrial pressure (mmHg) | <8 | 8 to 14 | >14 |
Cardiac index (L•minute–1•m–2) | ≥2.5 | 2.0 to 2.4 | <2.0 |
SvO2 (%) | >65 | 60 to 65 | <60 |
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