Optimizing Preoxygenation: A Comparative Analysis of Tidal VolumeBreathing vs. Eight Deep Breaths for Enhanced Oxygenation and SafeApnea Duration

Background: Preoxygenation is a crucial step in anesthesia induction to prevent hypoxemia during apnea.Various techniques, including tidal volume breathing and the eight deep breaths method, have been studied fortheir efficacy.Aim and Objectives: To compare the effectiveness of these techniques in optimizing arterial oxygenation.Materials and Methods: A prospective, randomized study was conducted on patients undergoing electivesurgery. Participants were assigned to either the tidal volume breathing group (three minutes of spontaneous tidalbreathing) or the eight deep breaths group (eight maximal inspiratory breaths over one minute). End-tidal oxygenconcentration (EtO2), arterial oxygenation levels, and safe apnea duration were measured and analyzed.Results: The mean EtO2 levels achieved in the eight deep breaths group were significantly higher (91.4 ± 3.2%)compared to the tidal volume breathing group (82.7 ± 4.6%) (p < 0.001). Arterial oxygenation levels (PaO2) werealso significantly greater in the deep breaths group (432.5 ± 24.3 mmHg) compared to the tidal breathing group(376.8 ± 29.7 mmHg) (p = 0.002). The safe apnea duration was prolonged in the deep breathing group (406.2 ±31.8 seconds) compared to the tidal volume group (342.5 ± 28.1 seconds) (p < 0.05). These findings demonstratethe superiority of deep breathing over tidal volume breathing for preoxygenation.Conclusion: The eight deep breaths method is a more efficient preoxygenation technique than tidal volumebreathing. It provides higher oxygen reserves and prolonged safe apnea duration, making it a preferred approachin clinical anesthesia practice.