Age differences in inflammatory and hypermetabolic postburn responses

Area of Science:

• Pediatric critical care
• Burn injury research
• Cardiovascular physiology

Background:

• Severe burns in children <4 years old are associated with significant morbidity and mortality.
• Understanding the specific contributors to poor outcomes in this age group is crucial for improving treatment strategies.

Purpose of the Study:

• To identify the key factors contributing to morbidity and mortality in severely burned pediatric patients younger than 4 years.
• To compare physiological responses, including metabolic, inflammatory, and cardiac parameters, across different pediatric age groups following severe burns.

Main Methods:

• 188 severely burned pediatric patients were stratified into three age groups: 0-3.9 years, 4-9.9 years, and 10-18 years.
• Measurements included resting energy expenditure, body composition (dual-energy x-ray absorptiometry), liver size and cardiac function (ultrasonography), and inflammatory markers, hormones, and acute-phase proteins.

Main Results:

• Resting energy expenditure was lowest in the 0-3.9 year group. This group maintained lean body mass and weight, unlike older children who lost both.
• While inflammatory markers were similar across groups, the youngest group showed decreased acute-phase proteins and cortisol.
• The 0-3.9 year group exhibited increased cardiac work and impaired cardiac function compared to older pediatric burn patients.

Conclusions:

• Increased mortality in young pediatric burn patients is linked to elevated cardiac work and compromised cardiac function.
• Neither hypermetabolic nor inflammatory responses were identified as primary drivers of mortality in this severely burned pediatric cohort.