Ambient nitrous oxide levels during pediatric sedations

Area of Science:

• Occupational Health
• Environmental Health
• Pediatric Dentistry

Background:

• Chronic exposure to trace levels of nitrous oxide is linked to health issues.
• Recent studies indicate elevated nitrous oxide in dental staff breathing zones.
• Concerns exist regarding safe nitrous oxide levels in pediatric dental settings.

Purpose of the Study:

• To quantify waste nitrous oxide levels during pediatric sedation.
• To assess the efficacy of scavenging systems in mitigating dental staff exposure.
• To compare environmental nitrous oxide concentrations with established safety guidelines.

Main Methods:

• Conscious sedation using chloral hydrate and hydroxyzine in 20 children (2-4 years old).
• Random assignment to either a scavenging or non-scavenging group.
• Nitrous oxide (40%) in oxygen administered throughout procedures.
• Waste nitrous oxide monitored via infrared spectrophotometry near the dentist's breathing zone.

Main Results:

• Environmental nitrous oxide levels were 12 times higher than National Institute for Occupational Safety and Health (NIOSH) recommendations.
• Elevated levels were observed irrespective of whether a scavenging system was used.
• The tested scavenging system did not significantly reduce exposure below recommended limits.

Conclusions:

• Current pediatric sedation practices may expose dental staff to unsafe nitrous oxide levels.
• The investigated scavenging system's efficiency in reducing environmental nitrous oxide is questionable.
• Further research is needed to develop and validate effective waste gas scavenging methods in dentistry.