间歇性低氧训练对高性能战斗机飞行员脑电复杂度及血氧饱和度的影响

目的 通过动态观察间歇性低氧训练前后高性能战斗机飞行员EEG复杂度和血氧饱和度(arterial oxygen saturation,Sa()2)的变化特征,为低氧适应性训练效果评价提供量化指标.方法 对32名高性能战斗机飞行员进行15 d的间歇性低氧训练(模拟高度3500 m),1次/d,每次25 min.于训练前后,分别检测受试者在模拟7500 m高空环境下的EEG、SaO2、红细胞数及血红蛋白含量,并对受试者低氧训练前后的检测数据进行t检验.结果 间歇性低氧训练后,受试者在模拟7500 m高空环境下的EEG复杂度较训练前显著降低,差异有统计学意义(P＜0.01),Sa()2升高,差异有统计学意义(P＜0.01),红细胞和血红蛋白含量则无明显变化(P＞0.05).结论 模拟3500 m间歇性低氧训练可提高机体高空缺氧耐力水平,EEG复杂度和SaO2可作为评价高性能战斗机飞行员间歇性低氧训练的定量生理指标. Abstract： Objective To explore the quantitative index for evaluating the intermittent hypoxia training effects by analyzing the characteristic changes of electroencephalogram (EEG) complexity and saturation of blood oxygen (SaO2) of high performance fighter pilots. Methods Thirty-two pilots were selected as subjects and undertook a 25 min-training (simulated hypoxia at 3500 m-oxygen concentration 13.1%) with Type DY-84 hypoxia training device once a day for 15 d. Before and after training the subjects were put in simulated 7500 m hypoxia condition (oxygen concentration 7.1%,ventilation volume 15L/min) and their EEG, SaO2, number of red blood cell and hemoglobin level were recorded and analyzed by t-test. Results Training effects showed that the subjects' 7500m EE(G complexity was significantly decreased (P＜0.01), but SaO2 was significantly increased (P＜0.01).Number of red blood cell and hemoglobin level had no obvious change (P＞0.05).Conclusions The simulated 3500 m intermittent hypoxia training could improve pilot's hypoxia tolerance. EEG complexity and SaO2, which are measured under simulated 7500 m hypoxia condition,would be the quantitative indices for evaluating the effects of intermittent hypoxia training for pilot.The results application would be hopefully expanded to the population who work at high altitude or in anoxic environment.     

高性能战斗机飞行员血清铁浓度和红细胞指标变化分析

目的 探讨高性能战斗机飞行员血清铁浓度和红细胞指标变化的机制. 方法 将来我院疗养的39名高性能战斗机飞行员作为观察组,72名歼-7、歼-8和强-5飞行员作为对照组,并比较两组飞行员血清铁浓度、红细胞指标的变化. 结果 高性能战斗机飞行员较对照组飞行员血清铁浓度、血红蛋白量、红细胞平均血红蛋白含量、平均红细胞血红蛋白浓度均降低,且有统计学意义(t=3.50～7.95,P<0.01);而红细胞计数升高,且有统计学意义(t=3.01,P<0.01). 结论 高性能战斗机飞行员因承受较大的加速度、缺氧、热负荷及应激,可能会引起血清铁浓度降低,红细胞计数代偿性升高,从而导致血红蛋白、红细胞平均血红蛋白含量、平均红细胞血红蛋白浓度下降,缺氧耐受力降低.因此.及早采取干预措施,及时减轻飞行疲劳和提高飞行耐力,对于保障飞行安全有重要意义.     

歼(强)击机飞行员心脏瓣膜生理性返流调查分析

Objective To investigate the prevalence of physiological valvular regurgitation and its influence in fighter (attacker) pilots. Methods One hundred pilots were divided into high performance fighter pilot group (56 pilots) and common fighter pilot group (44 pilots). Their cardiac structure and function were examined by echocardiography. Results 55 pilots were diagnosed with physiological valvular regurgitation (55.00%), including 32 high performance fighter pilots (57.14%) and 23 common fighter pilots (52.27%). The prevalence of tricuspid, mitral and combined valvular regurgitation was 33. 00%, 9.00% and 13.00% respectively. There were 11 cases of mitral combined tricuspid valvular regurgitation, 1 case of tricuspid combined pulmonic valvular regurgitation and 1 ease of tricuspid combined aortic valvular regurgitation. In common fighter pilot group, right ventricular internal dimension (RVID) of the pilots with regurgitation was significantly higher than that of the pilots without regurgitation (t= 1.69, P＜0.05). No other significant differences were observed between groups (P＞0. 05). The cardiac structure and function of 100 pilots were in normal range. Conclusions High prevalence of physiological valvular regurgitation is found in fighter pilots, and in which tricuspid valvular regurgitation takes the highest. It is necessary to further investigate if the fighter pilot's specificity makes the different mechanism of physiological regurgitation from other eareer's and its long-term influence on pilot's cardiac structure and function.     

高性能战斗机飞行员前庭习服训练效果观察

目的 通过前庭习服训练,提高高性能战斗机飞行员前庭稳定性,以降低空晕病的发生.方法 应用VTS-0型电动转椅对45例前庭稳定性评定等级为D、E级的高性能战斗机飞行员进行每天1次,持续2周的前庭习服训练,记录训练前后前庭稳定性评定中的Coriolis加速度耐受值及训练耐受时间.结果 训练后,45例高性能战斗机飞行员的前庭稳定性较训练前有不同程度提高,均达到C级以上,Coriolis加速度耐受值和训练耐受时间明显提高,且有统计学意义(t=14.55、12.66,P＜0.01).结论 前庭习服训练对提高高性能战斗机飞行员的前庭稳定性效果明显. Abstract： Objective To explore the effects of vestibular accliratization training of highperformance fighter pilots for improving their vestibular stability and reducing airsickness. Methods Forty-five high-performance fighter pilots, who were graded as D and E in vestibular stability evaluation, performed vestibular acclimatization training by VTS-0 rotational chair once a day for 2weeks. In vestibular stability evaluation, tolerated Coriolis acceleration value and endurable duration of rotation were compared between the states before and after training.Results All 45 pilots'vestibular stability was variously improved and reached or exceeded grade C by training. Tolerated Coriolis acceleration value and endurable duration were significantly increased (t=14.55, 12.66, P＜0.01).Conclusions Vestibular acclimatization training shows significant effects on improving the vestibular stability of high-performance fighter pilots.     

健康飞行员与高血压飞行员血浆内皮素和降钙素基因相关肽含量的比较

目的 比较民航健康飞行员与高血压飞行员血浆内皮素和降钙索基因相关肽含量的差异. 方法 采用放射免疫分析法测定87例民航健康飞行员及92例民航高血压飞行员的血浆内皮素和降钙素基因相关肽浓度. 结果 健康飞行员组血浆内皮素浓度为(49.3±8.64)pg/ml,降钙素基因相关肽浓度为(51.2±19.23)pg/ml;高血压飞行员组血浆内皮素浓度为(65.8±9.32)pg/ml,降钙素基因相关肽浓度为(31.6±15.46)pg/ml.高血压飞行员与健康飞行员相比,血浆内皮素浓度明显升高(t=12.26,P<0.01),而血浆降钙素基因相关肽浓度明显下降(t=7.54,P<0.01),两者差异均具有统计学意义. 结论 民航飞行员血浆内皮素和降钙素基因相关肽的分泌失调可能是其高血压发生的重要原因之一,应加强对民航飞行员血浆内皮素和降钙素基因相关肽的监测. Abstract： Objective To compare the difference of plasma endothelin (ET) and calcitonin generelated peptide (CGRP) concentration between healthy and hypertensive civil pilots. Methods Plasma ET and CGRP concentration were measured by radioimmunoassay in 87 healthy (as control group) and 92 hypertensive civil pilots. Results The plasma concentration of ET and CGRP was respectively (49.3±8.64) pg/ml,(51.2±19.23) pg/ml in healthy pilots,and (65.8±9.32) pg/ml,(31.6±15.46) pg/ml in hypertensive pilots.Comparing to the healthy the hypertensive pilots showed significantly higher plasma ET (t=12.26,P<0.01)) but lower CGRP concentrations (t=7.54,P<0.01). Conclusions The secretion maladjustment of plasma ET and CGRP would be the important reasons for inducing civil pilot's hypertension and the attentive monitoring is suggested.     

新型载人离心机在军事航空医学中的应用

目的 探讨在新型载人离心机上进行飞行员抗荷耐力选拔与训练、-Gx体验、动态飞行模拟(dynamic flight simulation,DFS)训练以及抗荷装备生理鉴定实验的方法,探索新型载人离心机的应用方法. 方法 ①24名飞行员在六三型载人离心机上进行基础+Gz耐力检查,然后按同样方法,在新型载人离心机上进行了对照检查.②100名飞行员进行了离心机训练,其中的42名飞行员为被动控制训练,58名飞行员为闭环控制训练.③8名飞行员体验-1.5 Gx及-2.0 Gx载荷.④18名飞行员进行DFS飞行体验,特技飞行动作包括左盘旋、右盘旋、半滚倒转、斤斗、半斤斗翻转和桶滚.⑤6名志愿者和9名飞行员在新型载人离心机上,分别进行服装、PBG、服装结合PBG、服装结合PBG及抗荷收紧动作(anti-G straining manoeuvre,AGSM)的抗荷效果试验. 结果 ①在新、老离心机上检查出的+Gz耐力结果平均值分别为(4.25±0.34)G及(4.41±0.14)G(t=3.03,P<0.01),其差异与连续检查所致的疲劳及飞行员对重复检查的主观重视程度有关,排除二者影响,在新离心机上可采用现有抗荷耐力选拔方法.②在进行被动控制训练的飞行员中,25人完成7 G持续10 s,9人完成8 G持续10 s,仅有2人完成9 G持续10 s.在进行闭环控制训练的58名飞行员中,48人完成7 G持续10 s,19人完成8 G持续10 s,23人完成9 G持续10 s.③飞行员在进行-Gx载荷体验时,反映在座舱俯仰、滚转过程中头晕、恶心的感觉比较明显.④飞行员认为DFS体验与实际飞行接近,对提高机动空战能力具有实用价值.⑤抗荷装备的抗荷性能达到了飞机性能的要求.结论 新型载人离心机在高性能战斗机飞行员抗荷耐力选拔训练、-Gx体验、DFS体验及抗荷装备生理鉴定试验等工作中获得广泛应用,形成了相关应用方法,取得了较好的效果,为进一步开展相关工作奠定了基础. Abstract： Objective To investigate the approaches and the application effects of acceleration tolerance screening and training for fighter pilots,-Gx experience,dynamic flight simulation (DFS) experience and physiological evaluation of anti-G equipment on new human centrifuge. Methods ①Twenty-four pilots underwent the relaxed+Gz tolerance examination on a single degree of freedom centrifuge (Model 63) and on new human centrifuge for comparison.②One hundred high performance fighter pilots carried out centrifuge training.Among them,42 pilots were in passive control mode while the other 58 pilots were trained by close-loop mode.③Eight pilots experienced -1.5 Gx and-2.0 Gx on the new centrifuge.④Eighteen pilots performed aerobatic maneuvers,such as left spiral,right spiraI,split S loop,immelmann,and barrel roll in DFS awareness.⑤Six volunteers and 9 pilots served as subjects.The tests of anti-G capability evaluation for suits,suits combined with pressure breathing for G (PBG),and suits combined with PBG and anti-G strainingmaneuver (AGSM) were conducted respectively. Results ①The mean relaxed+Gz tolerance of pilots obtained on the new and old centrifuge was (4.25±0.34) G and (4.41±0.14) G respectively (t=3.03,P<0.01).The difference would be relative to fatigue that caused by continuous running and pilots' endurance to the reduplicate riding.So the current+Gz tolerance screening method was applicable on the new centrifuge regardless of the influence of the above mentioned factors.②In the training under passive control mode,25 of 42 pilots completed the training of 7 G for 10 s,9 pilots for 8 G for 10 s and 2 for 9 G for 10 s.In the close-loop control training,48 pilots passed training of 7 G for 10 s,19 pilots for 8 G for 10 s,and 23 for 9 G for 10 s.③During-Gx experience,the feelings of dizzy and disgust were evident during the roll and pitch movements.④Pilots reported that DFS training was similar to actual flight and possessed great practical value in improving aerial combat ability.⑤The performance of anti-G equipments reached the functional requirement. Conclusions New human centrifuge can be applied in acceleration tolerance screening and training for high performance fighter aircraft pilots,-Gx experience,DFS training,and physiological evaluation for anti-G equipments.Relevant approaches have been established,and the application of new human centrifuge has acquired a satisfactory result.which lays the foundation for further work.     

新型载人离心机在军事航空医学中的应用

Objective To investigate the approaches and the application effects of acceleration tolerance screening and training for fighter pilots,-Gx experience,dynamic flight simulation (DFS) experience and physiological evaluation of anti-G equipment on new human centrifuge. Methods ①Twenty-four pilots underwent the relaxed+Gz tolerance examination on a single degree of freedom centrifuge (Model 63) and on new human centrifuge for comparison.②One hundred high performance fighter pilots carried out centrifuge training.Among them,42 pilots were in passive control mode while the other 58 pilots were trained by close-loop mode.③Eight pilots experienced -1.5 Gx and-2.0 Gx on the new centrifuge.④Eighteen pilots performed aerobatic maneuvers,such as left spiral,right spiraI,split S loop,immelmann,and barrel roll in DFS awareness.⑤Six volunteers and 9 pilots served as subjects.The tests of anti-G capability evaluation for suits,suits combined with pressure breathing for G (PBG),and suits combined with PBG and anti-G strainingmaneuver (AGSM) were conducted respectively. Results ①The mean relaxed+Gz tolerance of pilots obtained on the new and old centrifuge was (4.25±0.34) G and (4.41±0.14) G respectively (t=3.03,P<0.01).The difference would be relative to fatigue that caused by continuous running and pilots' endurance to the reduplicate riding.So the current+Gz tolerance screening method was applicable on the new centrifuge regardless of the influence of the above mentioned factors.②In the training under passive control mode,25 of 42 pilots completed the training of 7 G for 10 s,9 pilots for 8 G for 10 s and 2 for 9 G for 10 s.In the close-loop control training,48 pilots passed training of 7 G for 10 s,19 pilots for 8 G for 10 s,and 23 for 9 G for 10 s.③During-Gx experience,the feelings of dizzy and disgust were evident during the roll and pitch movements.④Pilots reported that DFS training was similar to actual flight and possessed great practical value in improving aerial combat ability.⑤The performance of anti-G equipments reached the functional requirement. Conclusions New human centrifuge can be applied in acceleration tolerance screening and training for high performance fighter aircraft pilots,-Gx experience,DFS training,and physiological evaluation for anti-G equipments.Relevant approaches have been established,and the application of new human centrifuge has acquired a satisfactory result.which lays the foundation for further work.     

飞行员血液同型半胱氨酸与心血管疾病的相关性研究

目的 研究飞行员血液同型半胱氨酸(homocysteine,Hcy)水平变化,预测飞行员心血管事件的发生. 方法 将163例飞行员和60例男性健康地面工作人员(对照组)按年龄分别设21～30岁、31～40岁和41～50岁组;同时按飞行时间将飞行员分别设≤1000 h、1001～2000 h、2001～3000 h和3001～4000 h组;采用全自动生化分析仪测定Hcy浓度. 结果 飞行员组血液Hcy浓度为(9.86±4.45)μmol/L,对照组为(7.10±1.77)μmol/L.两组比较显示飞行员组血液Hcy明显高于对照组(t=4.67,P＜0.01);在不同年龄组血液Hcy测定中,对照组21～30岁组与41～50岁组差异显著(P＜0.05),飞行员不同年龄组之间差异均显著(P＜0.05或P＜0.01);在不同飞行时间血液Hcy测定中,1001～2000 h组、2001～3000 h组均与≤1000 h组差异显著(P＜0.01).同一年龄组中,飞行员血液Hcy浓度均高于对照组(t=3.893、6.221、3.193,P＜0.01). 结论 测定血液Hcy可预测飞行员心血管事件发生的危险性,应针对飞行员血液Hcy升高采取强有力的干预措施,从而有效预防飞行员冠心病的发生. Abstract： Objective To study the change of homocysteine (Hcy) concerntration in pilot's blood and to predict the occurrence of cardiovascular events of pilots. Methods One hundred and sixty-three pilots and 60 male health ground service personnel were selected as pilot and control groups and respectively divided by age as 21-30, 31-40 and 41-50 yrs sub-groups. Pilots were also grouped into ≤ 1000 h, 1001-2000 h, 2001-3000 h and 3001-4000 h sub-groups by flying hours. The concentration of Hcy were detected by using automatic biochemical analyzer. Results The Hcy concentration in pilot group was (9.86±4.45) μmol/L comparing to (7.10±1.77) μmol/L in control group and the difference between groups was significant (t=4.67, P＜0.01). For the Hcy change by age, significant differences were between sub-group 21-30 yrs and 41-50 yrs in control group (P＜0.05), and between each two sub-groups in pilot group (P＜0. 05 or P＜0. 01). For the Hcy detection by flying hours, sub-group 1001-2000 h and 2001-3000 h respectively showed significant difference to ≤ 1000 h sub-group (P ＜ 0.01). Between the same age sub-groups, the Hcy concentration in pilots is higher than that in control groups (t=3. 893, 6. 221, 3. 193, P＜0.01).Conclusions Detecting the Hcy concentration in blood can be used to predict the risk of cardiovascular events of pilot. Taking powerful intervention measure to restrict the elevation of Hcy level can effectively prevent coronary heart disease of pilot.     

健康飞行员与高血压飞行员血浆内皮素和降钙素基因相关肽含量的比较

Objective To compare the difference of plasma endothelin (ET) and calcitonin generelated peptide (CGRP) concentration between healthy and hypertensive civil pilots. Methods Plasma ET and CGRP concentration were measured by radioimmunoassay in 87 healthy (as control group) and 92 hypertensive civil pilots. Results The plasma concentration of ET and CGRP was respectively (49.3±8.64) pg/ml,(51.2±19.23) pg/ml in healthy pilots,and (65.8±9.32) pg/ml,(31.6±15.46) pg/ml in hypertensive pilots.Comparing to the healthy the hypertensive pilots showed significantly higher plasma ET (t=12.26,P<0.01)) but lower CGRP concentrations (t=7.54,P<0.01). Conclusions The secretion maladjustment of plasma ET and CGRP would be the important reasons for inducing civil pilot's hypertension and the attentive monitoring is suggested.     

高性能战斗机飞行员血清铁蛋白与血红蛋白、胆红素等指标的相关性CSCD

高性能战斗机飞行员受到正加速度、低气压、振动、噪声、辐射、精神紧张等有害因素的影响,机体易发生“氧化应激反应”,导致血红素产生增多,而血红素氧合酶‐1（heme oxygenase‐1,HO‐1）系统不能被有效激活,或活性降低,使一氧化碳、铁离子及胆绿素生成减少,从而合成胆红素减少,血清铁浓度降低,导致 Hb合成减少,表明存在铁缺乏。血乳酸值是测定躯体疲劳的客观指标,机体在缺铁、应激情况下更多依赖糖酵解供能,机体产生乳酸增多,造成乳酸堆积,致使LD H水平升高,运动能力下降,出现身体酸痛等躯体疲劳症状,发生慢性疲劳综合征。血清铁蛋白（serum ferritins ,SF）是最早反映铁耗竭的指标,反映了机体铁储存的状况,如果飞行员在铁缺乏情况下飞行训练,容易出现慢性疲劳综合征,SF减少可能是预测飞行员发生慢性疲劳综合征的危险因素。因此,笔者对31名高性能战斗机飞行员SF、胆红素、Hb、RBC及LDH等指标与38名歼击机飞行员比较,并探讨高性能战斗机飞行员SF与其他各检测指标的相关性。     

长期服用抗癫痫药物对原发性癫痫患者平均血红蛋白含量的影响

目的探讨长期服用抗癫痫药物对癫痫患者平均血红蛋白含量的影响。方法回顾性分析54例长期服用抗癫痫药物的原发性癫痫患者红细胞数,红细胞比容,平均血红蛋白含量,以同时期门诊健康体检者30例为对照组。结果长期服用抗癫痫药物的原发性癫痫患者手术前红细胞数,红细胞比容与正常组无差别(P>0.05),平均血红蛋白含量高于对照组(P<0.01);与性别无关。结论长期服用抗癫痫药物可以导致患者平均血红蛋白含量增高,对这类患者给予叶酸和维生素B12的补充,可能会改善癫痫患者脑内缺氧的状态,缓解癫痫的发作。     

Reduced hemoglobin concentration and red cell hemoglobinization in Italian marathon and ultramarathon runners

Red blood cell indices, serum iron, and serum ferritin concentration were determined in 45 marathon runners, 56 ultramarathon runners, and 32 healthy sedentary controls. A significant reduction of hemoglobin concentration, hematocrit, mean corpuscular hemoglobin, mean corpuscular hemoglobin concentration, mean corpuscular volume, serum iron, and serum ferritin were found in marathon runners compared to control subjects. The same variables were also reduced, but to a lesser extent, in the less trained ultramarathon runners. The decreased hemoglobin concentration demonstrated in the runners examined is related to both a reduced mean corpuscular hemoglobin concentration and a reduced hematocrit and may depend on a reduction of the body iron stores.     

直升机与歼击机飞行员改装体检血尿酸及血脂资料比较分析

目的比较分析直升机与歼击机飞行员改装体检的血尿酸和血脂资料,初步了解上述指标在不同机种飞行员之间的差别。方法收集在我院进行改装体检的82名飞行员的血尿酸及血脂资料,分两组（直升机组和歼击机组各41人）,比较各项指标的组间差别。结果两组年龄及飞行时间均无统计学差别。组间血尿酸及血脂指标（TC、TG、HDL-C）的差别无统计学意义。直升机组血脂异常者共17人（占41.46%）,歼击机组血脂异常者共20人（占48.78%）。直升机组高尿酸血症者3人（占7.32%）,歼击机组高尿酸血症者5人（占12.20%）。组间高尿酸血症及血脂异常发病率的差别无统计学意义。结论参加改装体检的直升机飞行员与歼击机飞行员的血尿酸及血脂指标没有显著差别,但总体高尿酸血症和血脂异常的发生率较高,应注意改装后的健康管理,重点随访。     

Comparison of hematologic data in world elite junior speed skaters and in non-athletic juniors

During the world junior speed skating championship 2002 all athletes (60 males, 56 females) were subjected to hematologic blood testing one day before the competition as requested by International Skating Union--ISU. This study aimed to obtain hematological reference values for junior athletes, whilst the influence of endurance training on hematologic variables of young athletes was studied. Hematologic results of athletes were compared to results of non-athletes matched by age and gender (14 males, 17 females). The blood analysis was done on an ADVIA 120. To compare measurement of ferritin, erythropoietin, and soluble transferrin receptor in serum as well as in EDTA-plasma, serum and EDTA-blood was obtained from the control group. In hemoglobin and hematocrit we found no significant difference between the two groups, whereas the number of erythrocytes was lower in athletes. The mean corpuscular volume was higher in athletes, whilst the corpuscular hemoglobin content was only marginally higher in athletes than in non-athletes. Consequently corpuscular hemoglobin concentration mean was lower in athletes than in non-athletes. There was no difference of erythropoietin and soluble transferrin receptor, whilst in ferritin we found a difference between the groups. Endurance training does not change the values of hemoglobin and hematocrit. Increased mean corpuscular volume and decreased corpuscular hemoglobin concentration mean could be a result of changed properties of red blood cell-membrane caused by acidosis and higher osmolality during the training. In junior athletes we did not find an iron overload as described in some adult athletes.     

预警机飞行人员外周血象的调查分析

目的调查预警机飞行人员外周血象及影响因素。方法对2013年10月—2014年6月来我院健康体检的预警机飞行人员52名及运输机飞行人员78名的外周血象进行统计分析。结果预警机飞行人员外周血象绝大部分都在正常参考范围内,白细胞计数均值低于运输机飞行人员;红细胞计数、血红蛋白均值高于运输机飞行人员。结论预警机雷达辐射对飞行人员的外周血象有一定影响。     

战斗机飞行员颈椎退变研究

目的 了解战斗机飞行人员颈椎退变情况。方法对5年前作过MRI检查的战斗机飞行员（甲组,平均年龄47岁,平均累计飞行时间2100h,乙组,平均年龄27岁,平均累计飞行时间830h）。和无飞行经验年龄相仿的对照组人员（丙组）进行复查。结果与5年前MRI结果比较,每组的椎间盘突出数增加,但丙组的骨赘、老飞行员的椎管狭窄数明显增加。与5年前比较,老飞行人员与丙组间的MRI差别降低。结论战斗机飞行员的椎间盘退行性病变的发展可能较早。但是,随着年龄的增加,与对照组的差别逐渐缩小。     

巴基斯坦信德灾区中儿童重度贫血状况分析

目的探讨巴基斯坦南部信德灾区中重度贫血患儿贫血状况,为有针对性实施改善该地区特殊人群生长发育和贫血状况措施提供依据。方法将来医疗救援队就诊的中、重度贫血患儿520例设为观察组,46例驻地学校健康体检儿童设为对照组,分别测体质量、取静脉血检测血红蛋白(HGB)、红细胞(RBC)计数、平均红细胞容积(MCV)、平均红细胞血红蛋白量(MCH)、平均血红蛋白浓度(MCHC)、红细胞体积分布宽度(RDW),并进行对照比较。结果 520例中、重度贫血患儿体质量较同年龄别儿童体质量明显降低,RBC数量,两组无明显差异(P=0.092),MCV、MCH、MCHC均较对照组明显降低(P<0.001),而RDW则明显高于对照组(P<0.001)。结论巴基斯坦灾区儿童营养与健康状况不容乐观,严重低体质量、营养不良并小细胞低色素贫血患儿普遍存在,应尽早采取干预措施。     

歼击机噪声对人听力及工效的影响

目的 研究歼击机噪声对人听力及工效的影响.方法 ①检查103名歼击机飞行员和62名地勤人员的听力.②测试18名歼-8D飞行员在飞机噪声暴露前、噪声暴露（40 min）后0.5 h、1.5 h和15 h的听力.③用汉语话音短语作为工效学指标,测试30名受试者在3种条件下,识听56个歼击机座舱显示信息汉语话音短语的成绩.结果①103名飞行员中,50名有高频听力损失（占48.5%）,16名有语频听力损失（占15.5%）;62名地勤人员中,43名有高频听力损失（占69.4%）,13名有语频听力损失（占21.0%）.飞行员和地勤人员高频听力损失的“V”型凹陷在6000 Hz.②飞机噪声对飞行员的暂时性听阈偏移有明显作用,噪声暴露后1.5 h,飞行员的暂时性听阈偏移有恢复的趋势,噪声暴露后15 h,飞行员的暂时性听阈偏移已有很大程度的恢复,但大部分频率的听力还未恢复至噪声暴露前水平.③30名受试者在3种条件下识听56个汉语话音短语的成绩：安静环境中佩戴无源耳罩最高,模拟飞机噪声环境中佩戴无源耳罩最低,模拟飞机噪声环境中佩戴有源耳罩居中,其差异均有显著性意义（P＜0.01）.结论 歼击机噪声大,能引起飞行员和地勤人员的听力损伤,并导致工作绩效下降.