本文選題：正加速度　切入點(diǎn)：心臟功能試驗(yàn)　出處：《解放軍醫(yī)學(xué)雜志》2008年06期 　論文類(lèi)型：期刊論文

【摘要】：目的觀(guān)察中等強(qiáng)度反復(fù)正加速度(+Gz)暴露是否會(huì)對(duì)飛行員心臟功能產(chǎn)生不利影響。方法38名殲擊機(jī)飛行員接受離心機(jī)檢查,+Gz暴露峰值從+2.5Gz/10s開(kāi)始。通過(guò)后,每次再遞增+0.5Gz~+1.0Gz,達(dá)到最高加速度暴露強(qiáng)度+4.5Gz/10s后結(jié)束檢查。觀(guān)察飛行員+Gz暴露前后心臟超聲多項(xiàng)心功能指標(biāo)的變化。結(jié)果飛行員+Gz暴露后2~4h,左室射血分?jǐn)?shù)(EF)、短軸縮短率(ΔD)、主動(dòng)脈血流速度、肺動(dòng)脈血流速度和二尖瓣E峰速度,以及左心房收縮末前后徑、左心室收縮末前后徑、左右徑和左心室舒張末左右徑與暴露前比較變化不明顯(P0.05)。二尖瓣A峰速度輕度增加(P0.01),左心室舒張末前后徑和E/A峰速比值有所減小(P0.05)。其中12名飛行員+Gz暴露后24h,EF、ΔD和二尖瓣A峰速度較暴露前輕度增加(P0.05),E/A峰速比值仍有所減小(P0.05)。結(jié)論中等強(qiáng)度反復(fù)+Gz暴露對(duì)飛行員心臟收縮功能無(wú)明顯影響,但對(duì)心臟舒張晚期功能可造成暫時(shí)輕度不利影響,24h后趨向恢復(fù),提示應(yīng)重視+Gz暴露后飛行員心臟功能的保護(hù)。
[Abstract]:Objective to observe whether moderate intensity repeated positive acceleration (Gz) exposure can adversely affect the heart function of pilots. Methods 38 fighter pilots were examined by centrifuge, and the peak value of Gz exposure began at 2.5 Gz / 10 s. Each time 0.5 ~ 1.0 Gz was increased to the maximum acceleration exposure intensity 4.5 Gz / 10 s. The changes of cardiac function indexes before and after Gz exposure were observed. Results the left ventricular ejection fraction (LVEF) was observed at 2h 4 h after Gz exposure in pilots. Short axis shortening rate (螖 D), aortic blood flow velocity, Pulmonary artery flow velocity and mitral E peak velocity, left atrial end systolic diameter, left ventricular end systolic end diameter, The changes of left and right diameter and left ventricular end diastolic diameter were not significant (P0.05). The mitral valve A peak velocity increased slightly, left ventricular end diastolic diameter and E / A peak velocity ratio decreased P0.050.Among 12 pilots, 24 h after Gz exposure, EFF, 螖 D were decreased. The peak velocities of mitral valve A and mitral valve A increased slightly than those before exposure, and the ratio of E / A peak velocities of mitral valve increased slightly. Conclusion moderate intensity repeated Gz exposure has no significant effect on cardiac systolic function in pilots. However, the late diastolic function of the pilot may cause a temporary slight adverse effect on the recovery of cardiac function after 24 hours, suggesting that attention should be paid to the protection of heart function in pilots after GZ exposure.
【作者單位】：
【分類(lèi)號(hào)】：R852.21

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本文編號(hào)：1598768