Accession Number : ADA190468

Title :   Ventilation Criteria for Aeromedical Evacuation.

Descriptive Note : Final rept. Apr 84-Dec 85,

Corporate Author : STATE UNIV OF NEW YORK AT BUFFALO PULMONARY DIV

Personal Author(s) : Klocke, Robert A ; Aquilina, Alan T ; Grant, Brydon J ; Saltzman, Alan R ; Land, Patrica A

PDF Url : ADA190468

Report Date : Sep 1986

Pagination or Media Count : 44

Abstract : Air evaluation of patients requiring mechanical ventilation exposes these individuals to a barometric pressure that is approximately 25% less than normal. This limits the maximum inspired oxygen tension that can be provided as well as possibly altering ventilatory requirements. We investigated this problem in two ways. First, we used a theoretical analysis to set tolerance limits on vital physiological functions. Oxygen delivery, the product of cardiac output and arterial oxygen concentration, is the most important factor in ensuring survival. Surprisingly, overall ventilation could be reduced substantially without resulting in an unfavorable outcome. In second portion of the study, we induced the respiratory distress syndrome in anesthetized dogs and then exposed them to a reduced barometric pressure similar to that encountered with aeromedical evacuation. These experiments demonstrated no change in ventilatory requirements but indicated that reduced inspired oxygen tension resulted in substantial hypoxemia. Using these data, we have proposed guidelines for selecting candidates for aeromedical evacuation and determining optimal inspired oxygen concentration during air transport. Keywords: Medical services, Aeromedical evacuation, Ventilatory requirements, Air evacuation, and Mechanical ventilation.

Descriptors :   *AEROMEDICAL EVACUATION, *HYPOXIA, *VENTILATION, *OXYGEN CONSUMPTION, *RESPIRATORS, AIR, ARTERIES, BAROMETRIC PRESSURE, CONCENTRATION(CHEMISTRY), DOGS, HEART, MEDICAL SERVICES, OUTPUT, OXYGEN, PATIENTS, PHYSIOLOGY, RESPIRATORY SYSTEM, SIGNS AND SYMPTOMS, TENSION, TEST AND EVALUATION, THEORY, RESPONSE(BIOLOGY), PHYSIOLOGICAL EFFECTS, SURVIVAL(PERSONNEL), REQUIREMENTS, TOLERANCES(PHYSIOLOGY)

Subject Categories : Stress Physiology
      Life Support Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE