Changes in cardiac physiology after severe burn injury

Area of Science:

• Cardiology
• Pediatric Burn Injury
• Trauma Physiology

Background:

• Severe burn injuries induce significant physiological stress, characterized by increased catecholamines, tachycardia, and elevated cardiac output (CO).
• The duration of this cardiac stress following severe burns is not well-established, impacting survival and long-term outcomes.

Purpose of the Study:

• To investigate the extent and duration of cardiac stress in pediatric patients following severe burn injuries (≥ 40% TBSA).
• To quantify cardiac alterations and their persistence over time post-injury.

Main Methods:

• Cardiac parameters including heart rate, mean arterial pressure, CO, stroke volume, cardiac index, and ejection fraction were monitored in 194 burn survivors.
• Measurements were taken at regular intervals up to 2 years post-injury and compared to normal non-burned children.
• Rate pressure product was calculated to assess myocardial oxygen consumption.

Main Results:

• Heart rate, CO, cardiac index, and rate pressure product remained significantly elevated for up to 2 years post-burn compared to controls (P < .05).
• Ejection fraction remained within normal limits throughout the 2-year observation period.
• These findings indicate persistent, significant cardiac stress in children after severe burns.

Conclusions:

• Cardiac stress persists for at least 2 years following severe burn injury in pediatric patients.
• Sustained elevations in cardiac workload suggest a potential target for interventions to mitigate long-term morbidity.
• Further research into attenuating these detrimental cardiac responses is warranted.