artificial respiration

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A procedure used to restore or maintain respiration in a person or animal that has stopped breathing. The method uses mechanical or manual means to force air into and out of the lungs in a rhythmic fashion.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The manual or mechanical forcing of air into the lungs of a person who is not breathing in order to maintain life.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an emergency procedure whereby breathing is maintained artificially