Influences of high altitude on catheter water sac

Abstract

Objective To discuss the influences of high altitude on catheter water sac. Methods Under the circumstance of flight height of 6.5 km and cabin pressure of 795 hPa, 4 kinds of catheters were selected and each was injected with water of 10, 15, 20 and 25 ml. Shapes of water sacs, and whether there were bubbles in the water sac were observed. Diameter of the water sacs and size of the bubbles were measured. Results After water injection, the water sacs were of different shapes. But differences of water sac diameters were statistically meaningless(P>0.05). Water sacs, within which diameter of the bubbles were smaller than 10mm, were not influenced by the bubbles inside(P>0.05). Conclusions Influences of high altitude on catheter water sac is statistically meaningless, and ground standards are suitable for high altitude. Key words: High altitude; Catheter; Water sac; Air rescue