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青年健康受试者89名,取安静坐位。在低压舱3、4、5、6、7千米模拟高度上停留30～120分钟,运用代偿率Z值和障碍度S对循环各指标进行综合性定量评定。循环障碍仅发生于5,000与6,000米,发生率分别为28.9％与55.0％。主要表现特征是心率锐减,血压急降,代偿率低达障碍水平Z≤-20以下,大多数障碍者伴有心律紊乱,严重时伴有苍白、恶心、冷汗与无力等。均属生理性障碍。吸入氧气后迅速消除。产生机理设想为高层次脑中枢首先调节失常,进而导致植物神经功能紊乱,由正常的交感神经占优势转为迷走神经张力过度增强,致使循环代偿功能随之障碍。
89 young healthy subjects, take a quiet seat. In the low pressure cabin 3, 4, 5, 6, 7 km simulation height stay 30 to 120 minutes, the use of compensation rate Z value and the degree of disorder S comprehensive evaluation of the cycle of quantitative indicators. Circulatory disturbances occurred only at 5,000 and 6,000 meters, with rates of 28.9% and 55.0%, respectively. The main performance characteristics are sharp heart rate reduction, rapid decline in blood pressure, compensatory rate as low as the level of disorder Z ≤-20 or less, most of the disorders associated with heart rhythm disorders, severe with pale, nausea, cold sweat and weakness. Are physiological disorders. Inhaled oxygen immediately after the elimination. The mechanism of production is assumed to be the first high-level brain central dysregulation, leading to autonomic dysfunction, from the normal sympathetic dominant to vagal tone over-enhanced, resulting in circulatory compensation dysfunction.