Malagon I, Grounds R M, Bennett E D
UMDS Division of Anaesthetics, Guy's Hospital, London, UK.
Intensive Care Med. 1996 Dec;22(12):1396-9. doi: 10.1007/BF01709557.
To measure, with the use of suprasternal Doppler ultrasound, the hemodynamic changes in patients and volunteers during air ambulance repatriation.
Unblinded prospective observational study.
Chartered air ambulances for the international repatriation of patients.
Six medical crew members and seven patients transported back to hospitals in the UK.
The measurement of non-invasive blood pressure, ECG, heart rate, oxygen saturation and hemodynamic variables with suprasternal Doppler.
There was a drop in systolic and mean arterial blood pressure in the patient's group once in the air. Oxygen saturation dropped in both groups once at cruising altitude. Heart rate remained unchanged. Stroke distance and minute distance increased significantly in the patient's group and non-significantly in the volunteers. Peak velocity increased significantly in the patient's group. There was an overall reduction of systemic vascular resistance during take off and once at cruising altitude.
Hemodynamic changes happen during air ambulance transportation in fit and healthy volunteers and patients alike. These may be due to a combination of hypobaric hypoxia and gravitational forces. It is necessary to establish if these changes have short- or long-term effects in the critically ill.
使用胸骨上多普勒超声测量患者和志愿者在航空医疗转运回国过程中的血流动力学变化。
非盲前瞻性观察性研究。
用于患者国际转运回国的包机航空医疗服务。
6名医护人员以及7名被转运回英国医院的患者。
使用胸骨上多普勒测量无创血压、心电图、心率、血氧饱和度和血流动力学变量。
患者组在空中时收缩压和平均动脉压下降。两组在巡航高度时血氧饱和度均下降。心率保持不变。患者组的每搏输出量和每分钟输出量显著增加，志愿者组增加不显著。患者组的峰值速度显著增加。起飞期间及到达巡航高度后全身血管阻力总体下降。
健康志愿者和患者在航空医疗转运过程中均会出现血流动力学变化。这些变化可能是由于低压缺氧和重力共同作用所致。有必要确定这些变化对危重症患者是否有短期或长期影响。
