Altitude tolerance of general aviation pilots with normal or partially impaired spirometric function
M. T. Lategola, Marinus Flux, Peggy J. Lyne, United States. Office of Aviation Medicine, Civil Aeromedical Institute
Dept. of Transportation, Federal Aviation Administration, Office of Aviation Medicine, 1977 - Technology & Engineering - 10 pages
The altitude tolerance of 10 spirometrically impaired (SI) general aviation pilots with an average forced midexpiratory flow (FEF sub 25-75%) value of 65.1 percent was compared to that of 10 spirometrically normal (SN) pilots. Cardiorespiratory parameters assessed at ground level (GL) and at 8,000- and 12,500-ft altitudes were blood pressure, pulmonary ventilation, oxyhemoglobin saturation, temporal artery flow velocity, heart rate, and single-lead electrocardiogram. Although altitude exposure quantitatively displaced the SI group more than the SN group, the differences were not statistically significant at the probability level of 0.05. Unifocal premature ventricular contractions were present at GL in three of the pilots and showed no further changes at altitude. Therefore, the mean FEF sub 25-75% value of 65 percent of predicted normal for the SI group becomes a reasonable option as an objective screening norm for acceptable tolerance to general aviation altitudes in the ambient-air-breathing range. (Author).
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20 pilots A2 A3 SN A3 SN X acceptable tolerance Aeromedical altitude chamber altitude exposure altitude period altitude profile altitude tolerance ambient air Arterial Oxyhemoglobin aspects of flight aviation altitudes aviation pilots blood pressure breathing only ambient Cardiorespiratory parameters assessed COPD degrees of spiro ECG changes ECG recorder ex-smokers FEF _ flight safety forced midexpiratory flow grossly normal heart rate IMPAIRED SPIROMETRIC FUNCTION impairment was manifested male general aviation metric impairment moderate impairment norm for acceptable NORMAL OR PARTIALLY normal tolerance ond Address orthostatic tolerances oscilloscope Oxyhemoglobin Saturation PARTIALLY IMPAIRED SPIROMETRIC percent of predicted Performing Organization Peripheral airway PILOTS WITH NORMAL population sample predicted normal values premature ventricular contractions Pulmonary Ventilation PVC frequency quantitative safe flight screening norm single-lead electrocardiogram smokers SN group SN pilots spirometric assessment spirometric impairment spirometric parameters spirometrically normal SN TAFV tative Temporal Artery Unifocal premature ventricular