Which of the following statements regarding crush injury is correct?

A) A crush injury can occur if the PASG is left in place for greater than 1 hour.
B) Gangrene often sets in if a body part is entrapped for longer than 30 minutes.
C) Crush syndrome can occur if the body part is entrapped for more than 4 hours.
D) In a crush injury, the external appearance is a good predictor of internal damage.

Answer: C) Crush syndrome can occur if the body part is entrapped for more than 4 hours.