Obesity Impact on Trauma Patient Outcomes

Obesity has emerged as a pivotal determinant of morbidity and mortality following traumatic injury. Excess adiposity alters both the biomechanics of injury and the physiological response to trauma. Mechanically, subcutaneous fat may act as a barrier in some penetrating injuries, a phenomenon often termed the “cushion effect”, but it also increases the likelihood of rib and pelvic fractures in blunt trauma. Physiologically, obesity is associated with chronic low-grade inflammation, impaired pulmonary mechanics, and altered haemodynamics that can exacerbate post-traumatic shock and organ dysfunction. During resuscitation, relative hypovolaemia may occur if standard fluid volumes are not adjusted for increased body mass, contributing to early haemorrhagic complications. In the ensuing phases, obese patients exhibit higher rates of wound infection, thromboembolic events and prolonged intensive care support. Underweight trauma patients, by contrast, are susceptible to cardiac complications owing to limited metabolic reserves. Globally, the rising prevalence of obesity underscores the need for tailored trauma protocols, from prehospital triage through to rehabilitation, and highlights the importance of recognising body composition as a non-modifiable risk factor that informs both surgical decision-making and resource allocation.

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Obesity Impact on Trauma Patient Outcomes publication trend

The graph below shows the total number of articles in obesity impact on trauma patient outcomes across all publications each year (not limited to Nature Index journals).

Technical terms

Body mass index (BMI): A ratio of weight to height squared, used to categorise underweight, normal weight, overweight and obesity.

Injury Severity Score (ISS): A numerical score to assess overall trauma severity based on the most serious injuries in different body regions.

Multiple organ dysfunction syndrome (MODS): Progressive impairment of two or more organ systems following an acute insult, often driven by inflammation and hypoperfusion.

Hypovolaemia: A state of decreased circulating blood volume, which may lead to shock if not promptly corrected.

References

1. Obese trauma patients are at increased risk of early hypovolemic shock: a retrospective cohort analysis of 1,084 severely injured patients. Critical Care (2012).
2. The consequences of obesity on trauma, emergency surgery, and surgical critical care. World Journal of Emergency Surgery (2006).
3. The Effect of an Abnormal BMI on Orthopaedic Trauma Patients: A Systematic Review and Meta-Analysis. Journal of Clinical Medicine (2020).
4. The impact of obesity on surgical outcomes in patients undergoing emergency laparotomy for high-risk abdominal emergencies. BMC Surgery (2022).
5. Obesity and Anterior Abdominal Gunshot Wounds: A Cushion Effect. Cureus (2021).