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SpO2, blood oxygen saturation; PtO2, transcutaneous oxygen partial pressure; PtCO2, transcutaneous CO2 partial pressure; HR, heart rate; BP, blood pressure; RF, respiratory frequency; PAP, pulmonary artery pressure; Vt, tidal volume; VE, minute ventilation; Dl CO, pulmonary CO diffusion; VA = alveolar volume; TFC, thoracic fluid content; Pet CO2, end tidal CO2 pressure in the exhaled air.
