1.   Death usually occurred by suffocation as the weight of the rib cage compressed the lungs.

2.   Fluid accumulates in the chest, compressing the lungs and making breathing difficult.

3.   Patients have trouble breathing because their lungs are compressed by fluid in the mediastinum.

4.   That compresses the lungs evenly, producing a forceful flow of air that can expel the choking object.

5.   The technique compresses infected lungs, giving them time to rest and heal.

6.   Over time, tumors squeeze and compress the lungs, making it difficult and painful to breathe.