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Updated: Apr 20, 2026
Evaluation of Capnography Sampling Line Compatibility and Accuracy when Used with a Portable Capnography Monitor
Published on: September 29, 2020
A randomized controlled trial of capnography during sedation in a pediatric emergency setting
Melissa L Langhan1, Veronika Shabanova2, Fang-Yong Li2
1Department of Pediatrics, Yale University School of Medicine, New Haven, CT.
Insights
Capnography monitoring during pediatric procedural sedation reduces hypoventilation and oxygen desaturations. Real-time capnography allows for fewer, more timely interventions, improving patient safety in emergency departments.
Area of Science:
- Pediatric Emergency Medicine
- Anesthesiology
- Respiratory Monitoring
Background:
- Standard monitoring may not adequately detect hypoventilation during pediatric procedural sedation.
- Capnography offers a more sensitive measure of ventilation, detecting respiratory depression before hypoxemia.
Purpose of the Study:
- To evaluate if adding capnography to standard monitoring increases interventions for hypoventilation.
- To determine if these interventions decrease oxygen desaturations in sedated children.
Main Methods:
- 154 children undergoing procedural sedation were randomized to view capnography (intervention) or be blinded (control).
- Primary outcomes included rates of hypoventilation interventions and oxygen desaturations (<95%).
Main Results:
- Hypoventilation occurred more frequently in the control group (7.1% vs 1.0%).
- The intervention group had significantly fewer interventions (OR 0.25) but interventions were more timely.
- Timely interventions were associated with reduced hypoventilation and fewer oxygen desaturations.
Conclusions:
- Hypoventilation is common and often undetected by standard methods during pediatric sedation.
- Capnography enables providers to intervene more effectively, reducing hypoventilation and oxygen desaturation events.
- Real-time capnography enhances patient safety during procedural sedation in pediatric emergency settings.
Objective:
Data suggest that capnography is a more sensitive measure of ventilation than standard modalities and detects respiratory depression before hypoxemia occurs. We sought to determine if adding capnography to standard monitoring during sedation of children increased the frequency of interventions for hypoventilation, and whether these interventions would decrease the frequency of oxygen desaturations.
Methods:
We enrolled 154 children receiving procedural sedation in a pediatric emergency department. All subjects received standard monitoring and capnography, but were randomized to whether staff could view the capnography monitor (intervention) or were blinded to it (controls). Primary outcome were the rate of interventions provided by staff for hypoventilation and the rate of oxygen desaturation less than 95%.
Results:
Seventy-seven children were randomized to each group. Forty-five percent had at least 1 episode of hypoventilation. The rate of hypoventilation per minute was significantly higher among controls (7.1% vs 1.0%, P = .008). There were significantly fewer interventions in the intervention group than in the control group (odds ratio, 0.25; 95% confidence interval [CI], 0.13-0.50). Interventions were more likely to occur contemporaneously with hypoventilation in the intervention group (2.26; 95% CI, 1.34-3.81). Interventions not in time with hypoventilation were associated with higher odds of oxygen desaturation less than 95% (odds ratio, 5.31; 95% CI, 2.76-10.22).
Conclusion:
Hypoventilation is common during sedation of pediatric emergency department patients. This can be difficult to detect by current monitoring methods other than capnography. Providers with access to capnography provided fewer but more timely interventions for hypoventilation. This led to fewer episodes of hypoventilation and of oxygen desaturation.
