Abstract: A resuscitation breathing apparatus includes a high pressure source of breathable gas and an inhalation chamber having an inlet and an outlet. A face mask is connected to the outlet of the inhalation chamber. Inhalation and exhalation check valves in the face mask allow air to enter and exit a patient's lungs. An inhalation valve, connected between the inhalation chamber and the high pressure source, is controlled to open and close the inhalation valve when the pressure reaches first and second values, respectively. The inhalation chamber is vented to lower the pressure within the chamber after the inhalation valve is closed. The apparatus further includes a chest compressor in the form of an inflatable cuff for applying pressure to the patient's lungs during the exhalation phase. The cuff is inflated by gas from the high pressure source when the inhalation valve is closed.