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Variables and cut-off values used for risk stratification

Variables and cut-off values used for risk stratification
  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
WHO FC: World Health Organization functional class; BNP: brain natriuretic peptide; NT-proBNP: N-terminal fragment of pro-brain natriuretic peptide; SvO2: mixed venous oxygen saturation.
Reproduced with permission from the ©ERS 2017. European Respiratory Journal Aug 2017, 50 (2) 1700740; DOI: 10.1183/13993003.00740-2017.
Graphic 115237 Version 1.0

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