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Does inhalation injury limit exercise endurance in children convalescing from thermal injury?
M H Desai1, R P Mlcak, E Robinson
1Shriners Burns Institute, Galveston, TX 77550.
Insights
Children recovering from burns with inhalation injury face greater respiratory demands. This impacts their lung function long-term, even if endurance is similar to those without inhalation injury.
Area of Science:
- Pediatric critical care
- Pulmonary medicine
- Burn injury research
Background:
- Cardiopulmonary performance in pediatric burn survivors is not well understood.
- Inhalation injury is a significant complication of thermal trauma in children.
Purpose of the Study:
- To evaluate and compare cardiopulmonary function in children with and without a history of inhalation injury post-burn.
- To identify potential long-term respiratory effects of inhalation injury in pediatric burn patients.
Main Methods:
- Prospective study involving 40 pediatric burn survivors, divided into inhalation injury and non-inhalation injury groups.
- Utilized pulmonary function tests (spirometry, lung volumes) and cardiopulmonary stress testing (treadmill).
- Analyzed respiratory parameters including expired volume, respiratory rate, and dead space ventilation.
Main Results:
- Both groups achieved similar endurance levels during stress testing.
- Children with inhalation injury exhibited increased expired volume, respiratory rate, and dead space ventilation ratio, indicating higher respiratory system demand.
- Resting spirometry revealed abnormal lung function in 64% of the inhalation injury group versus 27% in the non-inhalation injury group.
Conclusions:
- Pediatric patients with a history of inhalation injury experience greater respiratory system stress during exertion.
- Inhalation injury is associated with a higher prevalence of abnormal resting lung function in children recovering from burns.
- These findings highlight the persistent impact of inhalation injury on pediatric cardiopulmonary health post-thermal trauma.
Abstract:
The cardiopulmonary performance levels in children who are convalescing from thermal injury are unknown. This investigation was designed to evaluate cardiopulmonary function in children with and without inhalation injury. Forty children with a mean time since burn injury of 2.6 +/- 1.9 years and a mean burn size of 44% +/- 22% total body surface area were selected for the study and divided into two groups: inhalation injury (group 1) and non-inhalation injury (group 2). Pulmonary function studies and cardiopulmonary stress testing were completed on all patients. Both groups reached the same endurance level on the treadmill; however, patients in group 1 did so with an increased expired volume, respiratory rate, and ratio of dead space ventilation to total ventilation which indicated that there were greater demands on the respiratory system. Spirometry and lung volumes at rest showed that 64% of patients in group 1 had abnormal lung function compared with only 27% of patients in group 2.