CAISS Injury Severity Scoring 5

Question 1

Which statement about the Organ Injury Scale (OIS) and AIS is correct?

Accepted Answer

OIS grades (I–V) generally correspond to AIS severity levels for specific organs

Answer

The AAST Organ Injury Scale grades (I–V) broadly parallel AIS severity codes and are often cross-referenced in operative trauma.

Question 2

A trauma patient has an ISS of 25. What is the approximate 30-day mortality rate in a typical US Level I trauma center?

Accepted Answer

Approximately 10–20%

Answer

An ISS of 25 corresponds to roughly 10–20% mortality depending on age, mechanism, and center performance.

Question 3

Which component is NOT part of the Revised Trauma Score (RTS)?

Accepted Answer

Injury Severity Score

Answer

The RTS uses only GCS, systolic blood pressure, and respiratory rate; ISS is an anatomic score not included in RTS.

Question 4

When coding a closed head injury, the AIS body region assigned is:

Accepted Answer

Head/Neck

Answer

All brain and spinal cord injuries, skull fractures, and cervical injuries are coded under the Head/Neck region.

Question 5

For quality improvement benchmarking, W-statistics derived from TRISS represent:

Accepted Answer

The number of unexpected deaths per 100 patients

Answer

The W-statistic estimates the number of survivors or non-survivors per 100 patients beyond what TRISS-predicted probability would expect.

(CAISS) Certified Abbreviated Injury Scale Specialist Practice Test