During what phase do internal organs undergo deceleration in a collision?

The phase during which internal organs undergo deceleration in a collision is during Phase 3. This phase is characterized by the rapid deceleration of the body when it comes to a sudden stop after an impact, particularly in the context of vehicle collisions. As the body and external structures experience rapid deceleration, the internal organs, which are not directly attached to the skeletal structure, continue moving forward at the original speed until they are subjected to the forces that bring them to a stop.

During Phase 3, this difference in motion between the internal organs and the rest of the body can result in injuries due to the organs colliding with surrounding structures or being pulled by the movement of the body. Understanding this phase is crucial for paramedics, as it helps in assessing potential internal injuries in patients involved in collisions, guiding the need for proper imaging and treatment strategies.