INFLUENCE OF ELEVATED INTRAPULMONARY PRESSURE ON RESPIRATION AND CIRCULATION
AIR FORCE Foreign Technology Division WRIGHT-PATTERSON AFB United States
Pagination or Media Count:
The changes in respiration under elevated intrapulmonary pressure, which take the form of an initial respiratory arrest, a subsequent retardation of respiration rate, and disruption of the normal relationships of the time and character of inhalation and exhalation activation and intensification of exhalation, result principally from stimulation of the vagus receptors located in the pulmonary tissue. The extent and character of the respiratory changes depend on the exhalation and inhalation pressure. The principal role in exhalation during respiration under pressure is played by the muscles of the prelum abdominale. The coordination of the functioning of the abdominal muscles and the true respiratory musculature during respiration under pressure is disrupted after bilateral vagotomy in the cervical region. At identical elevated intrapulmonary pressures the changes in circulation depend on the character of the pressure. In contrast to intermittent pressure, constant pressure causes more substantial circulatory disturbances, as manifested in a greater decrease in arterial pressure and a larger increase in venous pressure.
- Anatomy and Physiology
- Stress Physiology