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Artificial ventilation or respiration is when a machine assists in a metabolic process to exchange gases in the body by pulmonary ventilation, external respiration, and internal respiration. [1] A machine called a ventilator provides the person air manually by moving air in and out of the lungs when an individual is unable to breathe on their own.
[1] [2] Artificial respiration takes many forms, but generally entails providing air for a person who is not breathing or is not making sufficient respiratory effort on their own. [3] It is used on a patient with a beating heart or as part of cardiopulmonary resuscitation (CPR) to achieve the internal respiration.
Cardiopulmonary resuscitation (CPR) is an emergency procedure consisting of chest compressions often combined with artificial ventilation, or mouth-to-mouth in an effort to manually preserve intact brain function until further measures are taken to restore spontaneous blood circulation and breathing in a person who is in cardiac arrest.
Some trainers continue to use circulation as the label for the third step in the process, since performing chest compressions is effectively artificial circulation, and when assessing patients who are breathing, assessing 'circulation' is still important. However, some trainers now use the C to mean Compressions in their basic first aid training.
While the cessation of respiration is an obvious sign of sudden death, the cessation of circulation — and particularly the rhythm of the heart — is not as easy to detect. For this reason, the appreciation of artificial circulation as a key factor in resuscitation lagged considerably behind the obvious need for artificial respiration.
The first detailed descriptions of tracheal intubation and subsequent artificial respiration of animals were from Andreas Vesalius (1514–1564) of Brussels. In his landmark book published in 1543, De humani corporis fabrica , he described an experiment in which he passed a reed into the trachea of a dying animal whose thorax had been opened ...
They may have manual backup mechanisms to enable hand-driven respiration in the absence of power (such as the mechanical ventilator integrated into an anaesthetic machine). They may also have safety valves, which open to atmosphere in the absence of power to act as an anti-suffocation valve for spontaneous breathing of the patient.
Research and developments in artificial ventilation, both negative-pressure and positive-pressure, result in evolving assessments of the benefits and hazards of negative-pressure ventilators (NPVs). Different researchers and clinicians have made varying assessments, over time, about the primary positive and negative aspects of NPVs.