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Receiver operating characteristic curves constructed for detection of (a) increased VE/VCO2 slope (⩾45 ml/kg/min) by RVSLI, (b) severe PAH diagnosis (defined as mPAPRHC >35 mmHg) by RVSLI, (c) increased VE/VCO2 slope (⩾ 45 ml/kg/min) by QRS duration, and (d) decreased VO2 peak (⩽15 ml/kg/min) by QRS duration.
