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Korean Journal of Anesthesiology 2003;44(5):612-619.
DOI: https://doi.org/10.4097/kjae.2003.44.5.612   
Comparison of Tidal Volume Breathing and Deep Breathing Preoxygenation Techniques for a Cesarean Section.
Byung Ho Lee, Mee Young Chung, Jun Seuk Chea, Chang Jae Kim, Dong Suk Chung, Hee Sang Park
Department of Anesthesiology, College of Medicine, The Catholic University of Korea. bhlee@catholic.ac.kr
Preoxygenation is routine prior to rapid sequence induction of general anesthesia for a cesarean section. The aim of this study was to evaluate the preoxygenation techniques of tidal volume breathing (TVB) and deep breathing (DB) for a cesarean section.
One hundred twenty ASA I and II patients scheduled for a cesarean section under general anesthesia participated in the study. Preoxygenation was performed with 5, 7, and 10 L/min 100% oxygen. The following techniques were tested: 1) normal TVB for a 5-min period (TVB/5 min) and 2) DB for a 2-min period (4 DB/0.5 min, 8 DB/min, 12 DB/1.5 min and 16 DB/2 min). Inspired (FIO2) and end-tidal oxygen fraction (FETO2), end-tidal carbon dioxide pressure (ETCO2) and oxygen saturation (SpO2) were measured at 0.5-min intervals.
During TVB, FETO2 increased rapidly between 0.5 and 3.5 min and plateaued by 3.5 min at 78.5%, 83.3% and 90.8% with 5, 7 and 10 L/min 100% oxygen, respectively. Four DB/0.5 min increased FETO2 to 64.7%, 67.2% and 72.3% at 5, 7, and 10 L/min 100% oxygen, respectively. As compared with four DB/0.5 min, the values of FETO2 with TVB/1.5 min and TVB/2 min were high at 7, 10 and 5 L/min 100% oxygen.
We concluded that TVB/2 min was more effective than four DB/0.5 min in achieving preoxygenation but eight DB/min could be used in case of an emergent operation.
Key Words: Deep breathing; end-tidal carbon dioxide; end-tidal oxygen; inspired oxygen; preoxygenation; tidal volume breathing


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