Medical Diagnostics & Clinical Scoring

Ryan Score for Burn Mortality

Calculate the Ryan Score to objectively predict the probability of mortality in severe burn patients using age, TBSA, and inhalation injury.

Number of Risk Factors
0
Predicted Mortality0.3%

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Ryan Score Overview

The Ryan Score is an incredibly elegant, simple, and highly reliable clinical tool developed at the Massachusetts General Hospital to predict mortality in patients with severe burn injuries.

The 'Three Risk Factors' Model

The genius of the Ryan Score is its simplicity. It proved that complex algorithms are often unnecessary; burn mortality can be accurately predicted by simply counting the presence or absence of three objective, massive risk factors:

  1. Age greater than 60 years.
  2. Burn size greater than 40% of Total Body Surface Area (TBSA).
  3. The presence of an inhalation injury.

Survival Probability

The mortality rate exponentially increases with the addition of each risk factor, establishing a clear prognostic gradient that is easy to communicate to families during times of crisis.

Mortality % = f(Count of Risk Factors present)

Where:
0 Factors=
0.3% predicted mortality
1 Factor=
3.0% predicted mortality
2 Factors=
33.0% predicted mortality
3 Factors=
90.0% predicted mortality

Frequently Asked Questions

The Ryan score was validated in 1998. Since then, critical care has improved significantly. A modern re-validation study found that while the risk gradient perfectly holds true, the actual modern mortality rates are lower than predicted (e.g., 3 factors now carries closer to a 60-75% mortality rate rather than 90%).

Inhalation injury is typically diagnosed by a history of being trapped in a closed-space fire, the presence of carbonaceous sputum (soot in the airway), facial burns, singed nasal hairs, or confirmation of airway swelling via bronchoscopy.

Elderly patients often have pre-existing cardiovascular and pulmonary diseases. A severe burn causes a massive, hypermetabolic stress response and requires aggressive IV fluid resuscitation. An aging heart and kidneys often cannot tolerate this stress, leading to multi-organ failure.

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