Spacer microbial contamination and asthma outcomes: case series

Area of Science:

• Pediatric Pulmonology
• Infectious Diseases
• Asthma Management

Background:

• Pressurized metered dose inhalers (pMDI) are a primary asthma drug delivery method.
• Asthma guidelines recommend spacers for pMDI use to improve drug delivery.
• The potential impact of spacer microbial contamination on asthma control is not well understood.

Purpose of the Study:

• To investigate the association between microbial contamination of asthma spacer devices and poor asthma outcomes in pediatric patients.
• To assess bacterial and fungal growth in spacers used by children with persistent asthma.
• To correlate microbial findings with asthma control metrics.

Main Methods:

• A cross-sectional, single-center case series involving seven pediatric patients with persistent asthma.
• Sterile cotton swabs were used to collect samples from spacers for microbial analysis (bacterial/fungal growth).
• Parental questionnaires (including Asthma Control Test - ACT) and physician assessments evaluated asthma control.

Main Results:

• Two patients had poorly controlled asthma based on parent-reported ACT scores, and three by physician assessment.
• Only one spacer sample showed microbial growth (Candida albicans).
• No statistically significant association was found between ACT scores and microbial growth in spacers (p > 0.05).

Conclusions:

• The majority of pediatric asthma spacers in this study were not contaminated, even with inconsistent cleaning practices.
• Healthcare providers and pharmacists should emphasize proper spacer cleaning techniques to caregivers.
• Further research may be needed to fully understand the role of spacer hygiene in pediatric asthma management.