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Study of the optimal duration of preoxygenation in children
1Department of Anesthesia, Plastic Surgery Hospital, Chinese Academy of Medical Sciences, Beijing.
Insights
Two minutes of preoxygenation in children offers maximum denitrogenation benefits, ensuring a safe apneic period. Longer preoxygenation times did not significantly improve oxygen saturation maintenance during anesthesia.
Area of Science:
- Pediatric Anesthesiology
- Respiratory Physiology
- Critical Care Medicine
Background:
- Preoxygenation is crucial for safe anesthesia induction in children.
- Optimizing preoxygenation duration maximizes denitrogenation and extends the safe apneic period.
- Limited data exists on the ideal preoxygenation length in pediatric patients.
Purpose of the Study:
- To determine the optimal duration of preoxygenation in pediatric patients undergoing elective surgery.
- To evaluate the impact of varying preoxygenation times on oxygen saturation during apnea.
- To establish the safest preoxygenation protocol for children.
Main Methods:
- A randomized controlled trial involving 40 healthy children (2-7 years) undergoing plastic surgery.
- Four groups received 100% oxygen (O2) for 1, 2, or 3 minutes.
- Anesthesia induced with midazolam and fentanyl; muscle relaxation with vecuronium or succinylcholine.
- Oxygen saturation (SpO2) monitored, with times to reach 98%, 95%, and 90% recorded during apnea.
Main Results:
- Preoxygenation for 1 minute resulted in significantly shorter times to reach SpO2 thresholds (98%, 95%, 90%) compared to 2 or 3 minutes.
- No significant differences in SpO2 decline times were observed between 2, 3, or 4 minutes of preoxygenation.
- The duration of SpO2 decrease from 95% to 90% was similar across all groups.
Conclusions:
- Two minutes of preoxygenation in children provides maximal denitrogenation benefits and ensures a safe apneic period of approximately 2 minutes.
- Preoxygenation beyond 2 minutes does not offer additional significant advantages in maintaining oxygen saturation.
- Succinylcholine had a minimal impact on the safe apneic period compared to vecuronium.
Study Objective:
To determine the optimal length of preoxygenation in children.
Design:
Random design and comparison among groups.
Setting:
Operating room of a plastic surgery hospital of the Chinese Academy of Medical Sciences and the Peking Union Medical College.
Patients:
Forty healthy, ASA status 1 children (age 2 to 7 yrs), undergoing elective plastic surgery.
Interventions:
Children in Group 1 breathed 100% oxygen (O2) for 1 minute. Group 2 children breathed 100% O2 for 2 minutes. Group 3 and Group 4 children breathed 100% O2 for 3 minutes. Anesthesia was induced with midazolam 0.3 mg/kg, fentanyl 5 micrograms/kg. Muscle relaxation was achieved with vecuronium 0.1 mg/kg (Groups 1, 2, and 3) or succinylcholine 1.5 mg/kg (Group 4).
Measurements And Main Results:
Oxygen saturation (SpO2) was measured by pulse oximeter. The oximeter probe was applied to the right big toe. After preoxygenation, the times for SpO2 to decrease to 98% (T98), 95% (T95), and 90% (T90), respectively, were recorded during the apneic period. T98, T95, and T90 were significantly shorter in Group 1 than in Group 2 or Group 3. There was no statistically significant difference among Groups 2, 3, or 4 regarding T98, T95, and T90. The times for SpO2 to decrease from 95% to 90% were similar among the four groups.
Conclusions:
2 minutes of preoxygenation in children can provide the maximum benefit of denitrogenation and achieve 2 minutes of safe apea. 95% and 99% confidence intervals were 69 to 100 and 59 to 100, respectively. Succinylcholine had only a slight effect on the safe apneic period.