Balldin U I
Aviat Space Environ Med. 1978 Apr;49(4):599-602.
The RSAF two-pressure flying suit system to protect the pilot at high altitude has been tested from different medical safety aspects. To secure adequate alveolar oxygen pressure, the suit admits up to 70 mm Hg (9.3 kPa) positive pressure breathing by counter-pressure against the thorax and by a 3.2 times higher pressure in the anti-G suit. After 1 h of oxygen breathing, subjects were exposed to explosive decompression from an altitude of 9,000 m to 17,500 or 20,000 m in 0.5 s in a hypobaric chamber. No symptoms of decompression sickness or of alveolar rupture with gas embolism to the central nervous system were seen. Pulmonary X-rays after the test did not reveal any signs of lung rupture with extrapulmonary gas leakage. With the precordial Doppler ultrasound technique, intracardial gas bubbles (silent bubbles) could be detected only in one subject after explosive decompression to a 20,000-m altitude in the 10 experiments.
用于在高海拔地区保护飞行员的新加坡共和国空军双压力飞行服系统已从不同医学安全方面进行了测试。为确保足够的肺泡氧分压，该飞行服通过对胸部施加反压以及在抗荷服中施加高三点二倍的压力，允许高达70毫米汞柱（9.3千帕）的正压呼吸。在吸氧1小时后，受试者在低压舱内于0.5秒内从9000米高度暴露于17500米或20000米高度的爆炸减压环境中。未观察到减压病症状或肺泡破裂伴气体栓塞至中枢神经系统的症状。测试后的肺部X光检查未发现任何肺破裂伴肺外气体泄漏的迹象。在10次实验中，采用心前区多普勒超声技术，仅在一名受试者于爆炸减压至20000米高度后检测到心内气泡（无声气泡）。
