How are cardiopulmonary stress testing results expressed?

Updated: May 14, 2020
  • Author: Kevin McCarthy, RPFT; Chief Editor: Nader Kamangar, MD, FACP, FCCP, FCCM  more...
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The following parameters are measured or calculated on a breath-by-breath basis: minute ventilation (VE, L/min), tidal volume (VT, mL/breath), respiratory rate (RR, mL/breath), oxygen uptake (VO2, mL/min and mL/min/kg), carbon dioxide production (VCO2, mL/min), respiratory exchange ratio (RER, VCO2 -to-VO2), SpO2, heart rate (HR, beats/min), oxygen pulse (mL VO2/min/heartbeat), and BP (mm Hg). If ABG determinations are obtained, discrete values for the ratio of dead space to tidal volume (VD-to-VT) and alveolar to arterial oxygen gradient (A-a-to-O2) can be calculated for that interval of exercise.

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