Clinical Application Value Of Transcutaneous Carbon Dioxide Pressure Monitoring In Patients Undergoing Prolonged Laparoscopic Surgery

Objective: By comparing the correlation of transcutaneous carbon dioxide pressure?PtcCO₂?, end-tidal carbon dioxide pressure?PetCO₂? and artery carbon dioxide pressure?PaCO₂? to evaluate the feasibility of PtcCO₂ to predict the PaCO₂ in patients undergoing prolonged laparoscopic surgery.Methods: Forty-six adult patients undergoing selective laparoscopic surgery, pneumoperitoneum time > 3 hours, ASA ?^?,under general intravenous anesthesia and mechanical ventilation. respiratory parameters set tidal volume 7 ml/kg, frequency 18/min, established PtcCO₂?PetCO₂ and PaCO₂ monitoring and record the values at seven different time points as before pneumoperitoneum and every 30 minutes after pneumoperitoneum.Results: The 46 patients received 322 groups of data, PtcCO₂ was associated with PaCO₂ in a significant correlation? r = 0.906,P<0.05?,linear regression equation Y=4.049+0.884X?r²=0.815, P< 0.820?. PetCO₂ also had significant correlation with PaCO₂,?r=0.628,P<0.05?,linear regression equation Y=19.321+0.419X?r²=0.394 P<0.01?. PtcCO₂ was always correlated with PaCO₂ in a significant numerical in different monitoring points. But PetCO₂ and PaCO₂ significantly correlated only before pneumoperitoneum, they had moderate correlation within 90 minutes, and there is no correlation between them after more than 90 minutes. The difference between PtcCO₂ and PaCO₂?PaCO₂-PtcCO₂?was1.137±2.677 mm Hg, the absolute value less than or equal to 5 mm Hg accounted for 93.2% of all samples. The difference between PetCO₂ and PaCO₂?PaCO₂-PetCO₂?was 6.991±4.412 mm Hg, the absolute value less than or equal to 5 mm Hg accounted for 40.4% of all samples.Conclusions: Transcutaneous carbon dioxide pressure?PtcCO₂? monitoring offers a continuous and non-invasive method to predict the artery carbon dioxide pressure?PaCO₂?. PtcCO₂ was always significantly correlated with PaCO₂ in patients undergoing prolonged laparoscopic surgery. PtcCO₂ can accurately reflect PaCO₂ in patients undergoing prolonged laparoscopic surgery.