Arterial and End-Tidal Carbon Dioxide in Supine Obese Patients during General Anesthesia

Kenichi Satoh, Mami Chikuda, Ayako Ohashi, Miho Kumagai, Masahito Sato, Akiyoshi Kuji, Shigeharu Joh
2015 Open Journal of Anesthesiology  
We investigated the differences between partial pressure of arterial carbon dioxide and end-tidal carbon dioxide (P(a-ET)CO 2 ) with respect to the Broca-Katsura index (BKI), which is an obesity index, in obese patients during general anesthesia. Materials and Methods: From January 2003 to December 2013, we studied 601 patients aged 16 years old or over undergoing general anesthesia. Patients had American Society of Anesthesiology physical status I and II and we reviewed their anesthetic
more » ... r anesthetic charts. The P(a-ET)CO 2 with respect to the BKI divided patients into two groups: 16 to < 65 years old, and ≥ 65 years old, and compared the P(a-ET)CO 2 values between the two groups. Results: In patients aged 16 to < 65 years old, the mean P(a-ET)CO 2 was 2.2 ± 3.1 mmHg at BKI < 20%; 3.3 ± 3.1 mmHg at 20% < BKI < 40%; and 5.5 ± 5.0 mmHg at 40% < BKI < 60%. In patients aged ≥ 65 years old , the mean P(a-ET)CO 2 was 3.2 ± 4.1 mmHg at BKI < 20%; 4.3 ± 3.6 mmHg at 20% to < 40%; and 4.4 ± 3.3 mmHg at 40% to < 60%. Conclusion: The P(a-ET)CO 2 tends to increase in obese patients during general anesthesia with increasing BKI in patients aged 16 to < 65 years old.
doi:10.4236/ojanes.2015.55016 fatcat:b6getxb2nzasjmxbq4bs352h2m