How does shock lead to respiratory failure?

See below: In response to shock, the body secretes many substances, called cytokines, which may be damaging to the lungs causing an acute inflammatory reaction.

Acids...: There are many different types of "shock" (ex. Septic, hemmorhagic, etc.) but, in general, when shock occurs, excessive acids are produced in the blood due to the inflammatory cascade. One way to eliminate these acids is to exhale them but this requires increased work of breathing. Without intervention, fatigue ensues and respiratory failure occurs.