To investigate the characteristics and the influencing factors of respiratory metabolic changes in the patients with different sexes based on the measurement of respiratory metabolic indexes by turbine sensor and oxygen sensor.

The respiratory metabolism of 122 patients of different sexes (84 males and 38 females) was measured by COSMED metabolic vehicle gas analyzer. The respiratory quotient and respiratory frequency were analyzed, too. The effects of body mass index (BMI) on respiratory metabolic value were also analyzed.

There were significant differences in VO₂ and the average partial pressure of O₂ between the two groups, and they were significantly higher in male patients than in female ones (P<0.05). There was no significant difference in CO₂ production between the two groups (P>0.05). The oxygen ventilation equivalent (VE/VO₂) was significantly different between the two groups. There was no significant difference in the ventilation equivalent VE/VCO₂, the respiratory quotient R, the oxygen uptake per kilogram and the average exhaled CO₂ between the two groups (P>0.05). There were significant differences between the two groups in the average exhaled oxygen volume and the tidal volume and the oxygen uptake VO₂, which was higher in male patients than in female ones (P<0.05). There was no difference in the minute ventilation volume and the average partial pressure of CO₂ and the CO₂ output between the two groups (P>0.05).

The sensor-based measurement of respiratory metabolism in different sex groups is accurate and safe. It can comprehensively understand the respiratory metabolism and assist the evaluation of the cardiopulmonary function of severe patients.