Sanders A B, Meislin H W
Ann Emerg Med. 1983 Mar;12(3):140-4. doi: 10.1016/s0196-0644(83)80552-6.
Transport of patients involving changes in altitude has become commonplace in the treatment of trauma patients. Often these patients are treated with medical antishock trouser (MAST) suits initially and during transport. The effects of altitude changes on the pressures generated in MAST suits were systematically investigated. Jobst Standard Antishock Air Pants were applied to the lower half of a Resusci-Anne dummy and inflated to 30 mm Hg of pressure. In a simulation of patient transport, the inflated MAST suit and dummy were placed in a helicopter and ascended from 2,500 feet to 9,500 feet. Pressures increased to 84, 87, and 87 mm Hg in three separate trials. Intermittent MAST suit pressure readings at 1,000-foot increments in altitude showed a positive linear relationship. Three descending trials, in which the MAST suit was inflated to 60 mm Hg at 9,500 feet and the helicopter descended to 2,500 feet, were also done. Pressures dropped to 7, 8.5, and 8 mm Hg in the three trials. A positive second order relationship between MAST suit pressure and altitude was noted for the descending trials. It was concluded that MAST suit pressure is a function of altitude. Emergency medicine personnel should be aware of this, and should monitor patients accordingly when transporting through changes in altitude.
在创伤患者的治疗中，涉及海拔变化的患者转运已变得很常见。通常这些患者在最初及转运过程中会使用医用抗休克裤（MAST）套装进行治疗。系统地研究了海拔变化对MAST套装所产生压力的影响。将乔斯特标准抗休克气裤应用于复苏安妮模拟人下半身，并充气至30毫米汞柱压力。在模拟患者转运过程中，将充气后的MAST套装和模拟人置于直升机中，从2500英尺上升至9500英尺。在三次单独试验中，压力分别升至84、87和87毫米汞柱。在海拔每升高1000英尺时对MAST套装压力进行间歇性读数，结果显示呈正线性关系。还进行了三次下降试验，即在9500英尺处将MAST套装充气至60毫米汞柱，然后直升机下降至2500英尺。在这三次试验中，压力分别降至7、8.5和8毫米汞柱。对于下降试验，注意到MAST套装压力与海拔之间呈正二次关系。得出的结论是，MAST套装压力是海拔的一个函数。急诊医学人员应意识到这一点，并在通过海拔变化进行转运时相应地监测患者。
