Carchietti Elio, Cecchi Adriana, Valent Francesca, Rammer Raphael
Department of Hospital Services Organization, Azienda Ospedaliero-Universitaria di Udine and Regional HEMS, Friuli Venezia Giulia, Italy.
Air Med J. 2013 Mar-Apr;32(2):80-3. doi: 10.1016/j.amj.2012.06.012.
Depending on their amplitude and frequency, vibrations may facilitate bleeding and worsen the prognosis of patients with pelvic fractures transported by helicopter emergency medical services (HEMS). We measured the range of frequencies and amplitudes of forced vibrations produced by the helicopter used by the HEMS of the Italian Friuli Venezia Giulia region on the pelvis of transported persons. We performed 3 flight tests with 3 different volunteers (mass 70, 80, and 90 kg, respectively) loaded on the helicopter's stretcher and recorded the amplitudes and frequencies of vibrations through a triaxis sensor placed on the HEMS stretcher in the pelvis area. The flight profile planned was identical for each of the 3 iterations. Over the whole flight, the frequencies of vibration were between 26.4 and 53.5 Hz, and the greastest amplitude was 0.035 mm. The vibrations recorded in the helicopter may facilitate bleeding in unstable fractures. In the management of patients with pelvic fractures, HEMS crews should provide prehospital care that includes the use of specific splinting devices in addition to the spinal board, which allows an early immobilization of fractures and the limitation of pelvic motion.
根据其振幅和频率，振动可能会促进出血，并使通过直升机紧急医疗服务（HEMS）转运的骨盆骨折患者的预后恶化。我们测量了意大利弗留利-威尼斯朱利亚地区HEMS所使用直升机在转运人员骨盆上产生的强迫振动的频率范围和振幅。我们让3名不同的志愿者（体重分别为70、80和90千克）装载在直升机担架上进行了3次飞行测试，并通过放置在骨盆区域HEMS担架上的三轴传感器记录了振动的振幅和频率。3次飞行的计划飞行剖面相同。在整个飞行过程中，振动频率在26.4至53.5赫兹之间，最大振幅为0.035毫米。直升机上记录到的振动可能会促进不稳定骨折的出血。在骨盆骨折患者的管理中，HEMS机组人员应提供院前护理，包括除了脊柱板之外使用特定的夹板装置，这可以早期固定骨折并限制骨盆运动。
