Effects of compression of the body (e.g., in a building collapse).
Victims with severe chest and abdominal injuries usually die before help arrives. In survivors, pulse and blood pressure are usually normal at first, then blood leakage from ruptured vessels causes shock and local swelling, and blood pressure falls. Release of proteins from crushed muscles can cause kidney failure a day or two afterwards. Later, embolisms form from fat droplets that have merged after being squeezed out of fat cells and bone marrow.