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目的探讨加压呼吸时胸部对抗压对心血管的影响。方法观察 7名 1 8～ 2 0岁健康男性青年穿两种背心抗荷裤 ,在 30、5 0、70mmHg 3种加压水平 ,持续 3min加压呼吸的心血管反应。 结果所有被试者均完成试验。在加压值为 5 0、70mmHg持续 3min时 ,与各自对照组比 ,HR、MAP及TPR明显提高 ,SV明显降低 ,Q Z间期在各加压值加压呼吸时无明显变化。两种装备在 70mmHg加压呼吸时ΔSV、ΔTPR有显著性差异 (P <0 .0 5 )。结论使用这两种装备进行加压呼吸均可造成MAP、TPR和HR明显增加 ,SV明显减少。加压呼吸对心肌收缩功能并无影响。在加压呼吸条件下 ,胸部对抗压与面罩腔内压力相等 ,对提高SV有明显效果
Objective To investigate the effects of chest compressions on cardiovascular during pressure breathing. Methods Seven healthy male youth aged 18 ~ 20 years were challenged with two kinds of vest-resistant trousers and were subjected to pressure respiration for 3 minutes at 3 levels of 30, 50 and 70 mmHg. Results All subjects completed the experiment. Compared with the respective control group, HR, MAP and TPR were significantly increased and SV significantly decreased at the pressure of 50 and 70 mmHg for 3 min. No significant changes were observed in the QZ interval at the time of pressurized respiration. Both devices had significant differences in ΔSV and ΔTPR at 70 mmHg pressurized respiration (P <0.05). CONCLUSIONS: Both devices use pressurized breathing can cause MAP, TPR and HR increased significantly, SV significantly reduced. Pressure breathing has no effect on myocardial contractility. Under the conditions of pressurized breathing, the chest compressive pressure equal to the pressure in the mask cavity, SV has obvious effect