Balldin U I, Borgström P
Aviat Space Environ Med. 1977 Nov;48(11):1007-11.
The influence of negative pressure breathing on the appearance of intracardial gas bubbles at a subsequent decompression to altitude was investigated in five subjects using the precordial Doppler ultrasound technique. Every subject was tested for a suitable exposition that, after 30 min oxygen breathing at surface, caused both intracardial bubbles and decompression sickness. An identical exposition followed a week later, except that oxygen breathing at the surface now included negative pressure breathing. In all cases, negative pressure breathing caused a delay of the onset of both intracardial bubbles and bends and, in some cases, neither bubbles nor bends appeared at all. The total amount of bubbles was always less after negative pressure breathing. Thus, negative pressure breathing in connection with decompression may reduce the amount of intracardial bubbles and the risk of decompression sickness. This may be of importance in diving procedures and in the construction of diving devices.
利用心前区多普勒超声技术，对5名受试者进行研究，以探讨负压呼吸对随后减压至高空时心内气泡出现情况的影响。对每名受试者进行适当的暴露测试，即在海平面呼吸30分钟氧气后，会导致心内气泡和减压病。一周后进行相同的暴露测试，只是此时海平面的氧气呼吸包括负压呼吸。在所有情况下，负压呼吸都会使心内气泡和减压病发作延迟，在某些情况下，根本不会出现气泡和减压病。负压呼吸后气泡的总量总是较少。因此，与减压相关的负压呼吸可能会减少心内气泡的数量和减压病的风险。这在潜水程序和潜水设备的构造中可能具有重要意义。
