Among 116 pairs of data with oxygenation index <200 mm Hg, the difference of PaCO 2-PETCO 2 ≥10 mm Hg was found in 25 pairs (21.55%) in 182 pairs of data with oxygenation index ≥200 mm Hg, the difference of PaCO 2-PETCO 2 ≥10 mm Hg was found in 26 pairs

Under different oxygenation indexes, there was no statistically significant difference between the 2 correlation coefficients. In patients with chronic obstructive pulmonary disease (r = 0.80), multiple trauma (r = 0.64), severe pneumonia (r = 0.60), gastrointestinal surgery (r = 0.57), and cerebrovascular diseases (r = 0.53), PETCO 2 and PaCO 2 were positively correlated. In different ventilator modes, the correlation coefficient was 0.81 for synchronized intermittent mandatory ventilation, 0.47 for assisted/controlled ventilation, and 0.55 for spontaneous breathing, respectively.

Without distinguishing the ventilator mode, there was significant positive correlation between PETCO 2 and PaCO 2. Subsequently, the difference and correlation between PETCO 2 and PaCO 2 were analyzed.Ī total of 184 patients with 298 pairs of PETCO 2-PaCO 2 data were included in the analysis. Patients requiring invasive mechanical ventilation underwent one of the following mechanical ventilation modes: assisted/controlled ventilation, synchronized intermittent mandatory ventilation, and spontaneous breathing. This was a cross-sectional study of adult patients on invasive mechanical ventilation enrolled between June 2018 and March 2019. This study aimed to observe the correlation between PaCO 2 and PETCO 2 in patients on invasive mechanical ventilation. So far, only a few studies have examined and confirmed the correlation between end-expiratory carbon dioxide partial pressure (PETCO 2) and arterial carbon dioxide tension (PaCO 2) during invasive mechanical ventilation in critically ill patients.

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