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在动物离心机上测定了7只轻度麻醉家免暴露于+G_Z时心、眼水平动脉压和心率的变化。+G_Z作用5-12s时、心水平动脉压(HABP)降至最低水平,然后开始代偿性回升。当+G_Z增大到一定值时,于加速度达峰值后,HABP降为0 mmHg、并在峰值后5.5±1.7s降到最大负值,继之代偿性升为正值,并常再度降为负值。我们称HABP的这种变化状态为“临界状态”。+G_Z暴露时,心率以两种型式发生改变:第一种,随着G值增大,心率发生不同程度增快,当加速度达某一G值时,心率突然减慢至2次/秒左右;第二种,当G值≥3时,在暴露过程中,心率逐渐减慢,并在某一G值,心率减慢到2次/秒左右。心率和HABP关系密切。当HABP达临界状态时,心率减慢至2次/秒左右并出现明显节律不整。以心率减慢到2次/秒左右作为家免+G_Z耐力终点是合适的,该指标规律性强,重复性好,实验方法对动物无损伤又易实施。按此标准,测得7只家免的+G_Z耐力为4.85±0.47G。
The changes of ocular arterial pressure and heart rate in seven mild anesthesiologists without exposure to + G_Z were measured on an animal centrifuge. + G_Z effect 5-12s, cardiac arterial pressure (HABP) down to a minimum level, and then began compensatory recovery. When + G_Z increases to a certain value, HABP decreases to 0 mmHg after reaching the peak value of acceleration, and drops to the maximum negative value 5.5 ± 1.7 s after peak value, then compensates for positive value, and then drops again Negative. We call this HABP’s state of change “critical.” In G + Z exposure, the heart rate changes in two types: first, the heart rate increases to different degrees as the G value increases, and when the acceleration reaches a certain G value, the heart rate suddenly slows down to 2 times / second ; The second, when the G value ≥ 3, during the exposure, the heart rate gradually slowed down, and in a G value, the heart rate slowed down to 2 times / second. Heart rate and HABP are closely related. When HABP reaches a critical state, the heart rate slows down to about 2 beats / second and there is a significant irregular rhythm. To heart rate slowed to 2 times / second as home-free + G_Z endurance endurance is appropriate, the law of regularity, good repeatability, the experimental method of animal damage and easy to implement. According to this standard, we measured 7 + G_Z endurance of 4.85 ± 0.47G.