高压氧治疗重型颅脑损伤后临床、脑电地形图、血浆内皮素、经颅多普勒超声的研究

目的研究高压氧（ＨＢＯ）治疗重型颅脑损伤（ＳＥＩ）的疗效及机制。方法治疗组３５例,对照组２０例,观察ＨＢＯ前后脑电地形图（ＢＥＡＭ）血浆内皮素（ＥＴ）及经颅多普勒超声（ＴＣＤ）查大脑中动脉收缩期流速,平均流速及搏动指数（ＭＣＡ－Ｖｓ,Ｖｍ,ＰＩ）等７项参数。结果治疗组的临床（ＧＣＳ）,ＢＥＡＭ,预后（ＧＯＳ）均明显迅速改善,与对照组有显著性差异。治疗组在ＨＢＯ１疗程后的ＥＴ值从（９１．２４±１２．１８）ｎｇ／Ｌ降到（６８．８８±１４．３７）ｎｇ／Ｌ（Ｐ＜０．０１）,与对照组相应时相比较,ＥＴ降至（８３．１２±１２．２２）ｎｇ／Ｌ,也有显著性差异（Ｐ＜０．０５）。相应的ＴＣＤ的ＭＣＡ－Ｖｍ从（６４．２±４．８）ｃｍ／ｓ降至（５１．６±４．２）ｃｍ／ｓ（Ｐ＜０．０１）,ＭＣＡ－Ｖｓ,ＰＩ的下降同样有极显著性差异（Ｐ＜０．０１）。结论ＨＢＯ能迅速改善重型颅脑损伤者的意识状态、ＢＥＡＭ异常率及生存质量。研究表明与急性期血浆ＥＴ下降和ＭＣＡ血管痉挛缓解有关,表现在ＭＣＡ血流速度和血管阻力的改善,从而减轻脑缺血缺氧,降低颅压,这是ＨＢＯ改善预后的重要机制之一。     

COPD患者流速容量环及其与运动能力的关系

目的：探讨慢性阻塞性肺疾病（ＣＯＰＤ）患者呼吸运动方式和运动受限的原因。方法：ＣＯＰＤ患者在功率自行车上运动至最大运动量,观察其潮气流速容量环的变化特点,并利用相关和逐步回归分析判断运动中最大公斤耗氧量（ＶＯ２ｍａｘ／ｋｇ）与静态最大流速容量环呼气流速间的关系。结果：１ＣＯＰＤ患者运动中潮气流速容量环的变化有其特点;２ＣＯＰＤ患者最大公斤耗氧量与Ｖ７５％、Ｖ５０％和Ｖ２５％呈显著正相关（ｒ分别为０．８５７,０．８７５和０．７８９,Ｐ＜０．０１）;３ＣＯＰＤ患者ＶＯ２ｍａｘ／ｋｇ与Ｖ５０％存在直线回归关系ｔ＝６．３７３,Ｐ＜０．０１。结论：１ＣＯＰＤ患者的特殊呼吸方式为运动中潮气流速容量环逐渐向肺总量位附近偏移;２静态Ｖ５０％减小是ＣＯＰＤ患者运动受限的主要原因。     

绞股蓝总皂甙对肝脏四氯化碳损伤保护作用的实验研究

给慢性四氯化碳（ＣＣ１＿４）肝损害小鼠灌喂绞股蓝总皂甙（ＧＰｓ），剂量为每次７５ｍｇ／ｋｇ或１５０ｍｇ／ｋｇ（每周５次，共３周），均能明显减轻肝组织损害，与未治疗组比较差异有显著意义（Ｐ＜０．０５和Ｐ＜０．０１）。用ＧＰｓ治疗的两组小鼠血清丙氨酸转氨酶（ＡＬＴ）活性均较未治疗组降低，血清白蛋白含量和Ａ／Ｇ比值较未治疗组升高。在原代培养大鼠肝细胞损伤模型上，预先用浓度为１０ｍｇ／Ｌ和４０ｍｇ／Ｌ的ＧＰｓ处理大鼠肝细胞，肝细胞ＤＮＡ合成速率分别从ＣＣ１＿４损伤组的３１．９％升高到６７．６％（Ｐ＜０．０５）和８２．４％（Ｐ＜０．０１）；肝细胞培养液中ＡＬＴ活性均明显低于损伤组（Ｐ＜０．０１）。表明ＧＰｓ能减轻ＣＣ１＿４诱导的小鼠慢性肝损害和离体大鼠肝细胞损伤，改善肝脏合成白蛋白的功能，保护肝细胞ＤＮＡ合成。     

21d头低位卧床中几种体液调节激素的变化

目的观察卧床模拟失重所致血浆肾素活性（ＰＲＡ）、醛固酮（Ａｌｄ）及前列腺素（ＰＧＩ２）的变化和ＬＢＮＰ对抗措施对上述激素的影响。方法１２名健康男性志愿者进行了２１ｄＨＤＴ－６°卧床实验。被试者年龄２３．７±５．０岁,随机等分为对照组（ＣＯＮ）和下体负压（ＬＢＮＰ）组。ＬＢＮＰ组在卧床最后一周进行下体负压锻炼（－３０ｍｍＨｇ,１ｈ／ｄ）。卧床前、卧床第２、４、１１天及卧床结束日清晨分别抽取肘静脉血。结果与卧床前相比,Ａｌｄ在第２天显著下降（ＣＯＮ－３０％,Ｐ＜０．０５;ＬＢＮＰ－３８％,Ｐ＜０．０１）,在第１１天显著上升（ＣＯＮ＋３０％,Ｐ＜０．０５;ＬＢＮＰ＋４８％,Ｐ＜０．０１）。ＰＲＡ在第４天达到峰值（Ｐ＜０．０５）,第２２天回落到低于对照水平。ＰＧＩ２在ＨＤＴ过程中均高于对照水平。对照组在第２２天增加＋２６０％（Ｐ＜０．０１）,ＬＢＮＰ组在第１１天,第２２天分别升高１４９％,１０２％（Ｐ＜０．０５）。采用ＬＢＮＰ对抗措施后,ＰＲＡ,Ａｌｄ在两组间无明显差别,ＰＧＩ２在ＬＢＮＰ组未进一步升高。结论２１ｄ头低位卧床导致ＰＲＡ、Ａｌｄ的一过性升高及ＰＧＩ２持续性升高。     

雌激素替代疗法对绝经后妇女冠心病患者血脂及胰岛素抵抗的近期影响

为探索小剂量雌激素（Ｅ）及Ｅ与孕激素（Ｐ）联合应用对妇女冠心病（ＣＨＤ）的防治机制。将１０８例绝经１年以上的ＣＨＤ患者随机分为３组各３６例，甲组口服ｐｒｅｍａｒｉｎ（倍美力）０．６２５ｍｇ１／ｄ，乙组口服ｌｉｖｉａｌ（利维爱）２．５ｍｇ，１／ｄ，丙组口服安慰剂１片／ｄ，于服药前及服药第３、６个月末检测血浆性激素、血脂谱、糖代谢等各项指标的变化情况。结果显示，ｐｒｅｍａｒｉｎ治疗３个月后可使ＴＣ降低１２．８％，ＴＧ降低１７％，ＬＤＬ－Ｃ降低２９％，ＨＤＬ－Ｃ上升１４．６％，Ｉｎｓ降低３７．８％，１／ＳＧ．Ｉｎｓ上升１倍（Ｐ均＜０．０１），６个月时与３个月治疗效果相同。而ＳＧ治疗前后无显著变化（Ｐ＞０．０５）。ｌｉｖｉａｌ治疗３个月及６个月时ＴＣ降低８．７％，ＴＧ分别降低１５．６４及３３．８％、ＨＤＬ－Ｃ降低１９．７％及２８．３％（Ｐ均＜０．０１），ＬＤＬ－Ｃ、Ｉｎｓ、ＳＧ水平１／ＳＧ．Ｉｎｓ比值治疗前后无显著变化。安慰剂组治疗前后各指标均无显著变化。表明单用小剂量Ｅ可显著改善绝经后妇女ＣＨＤ患者的异常血脂谱、胰岛素抵抗，其作用显著优于Ｅ＋Ｐ联合疗法。     

+Gz作用下兔心脏功能的改变

为观察＋Ｇｚ作用下兔心脏功能的改变，７只新西兰兔经麻醉后依次分别暴露于＋２、＋４和＋６Ｇｚ，峰值持续时间为３０ｓ，增长率为１Ｇ／ｓ，每次暴露后恢复时间为１５ｍｉｎ。记录左心室内压、左心室内压变化速率、心电图等的变化。在＋２、＋４和＋６Ｇｚ作用下，左心室内压峰值较暴露前对照值分别降低６２．９６％（Ｐ＜０．０１）、６３．３４％（Ｐ＜０．０１）及８２．０１％（Ｐ＜０．０１），左心室内压最大上升速率分别降低５８．４６％（Ｐ＜０．０１）、５３．５９％（Ｐ＜０．０１）及６３．０６％（Ｐ＜０．０１），左心室舒张末压分别降低６７．７８％（Ｐ＞０．０５）、３３２．７４％（Ｐ＜０．０１）及５００．５４％（Ｐ＜０．０１）。除ＰｖＣＯ２在＋６Ｇｚ作用后即刻显著升高外（Ｐ＜０．０５），其余动、静脉血气结果在＋Ｇｚ作用后即刻较暴露前对照值均无显著性变化。＋Ｇｚ作用可引起兔心脏泵血功能显著降低。     

30例急性心肌梗塞溶栓治疗后的Q—T离散度变化

３０例急性心肌梗塞〈ＡＭＩ〉病人,给予尿激酶溶栓治疗,有效１７例,占５６．７％,无效１３例,占４３．３％。无效组溶栓后６小时ＱＴＣ离散度（Ｑｄｃｄ）较溶栓后２小时延长（８１±２７ｍｓ与６４±２６ｍｓ：ｐ＜０．０１）,有效组溶栓后６小时较溶栓后２小时Ｑ...     

高压氧对实验兔海水型呼吸窘迫综合征的预防作用

目的　观察高压氧（ＨＢＯ）对海水淹溺肺水肿（ＰＥ－ＳＷＤ）的预防作用。方法　复制ＰＥ－ＳＷＤ动物模型后,３２ 只兔随机分为ＰＥ－ＳＷＤ对照组、药物治疗组和ＨＢＯ组。对３ 组兔的动脉血气酸碱指标、Ｃａ２＋ 沉淀反应颗粒、ｃ－ｆｏｓ ｍ ＲＮＡ和ｃ－ｊｕｎ ｍ ＲＮＡ 等进行自动检测和定量分析比较,并观察分析３组兔的存活时间和海水型呼吸窘迫综合征（ｓｅａｗ ａｔｅｒ－ｒｅｓｐｉｒａｔｏｒｙ ｄｉｓｔｒｅｓｓ ｓｙｎｄｒｏｍ ｅ,ＳＷ－ＲＤＳ）发生率。结果　ＨＢＯ组兔ＰａＯ２ ,ＳａＯ２ 和ｐＨ ３ 项指标比药物组显著升高（Ｐ＜ ０．０１）,动物存活时间［（４３．０３±７．１９）小时］比药物组［（２３．５８±１．４９）小时］明显延长,Ｃａ２＋ 沉淀反应颗粒,ｃ－ｆｏｓ ｍ ＲＮＡ,ｃ－ｊｕｎ ｍ ＲＮＡ和ＳＷ－ＲＤＳ发生率ＨＢＯ组则明显低于药物组（Ｐ＜ ０．０１）。结论　ＨＢＯ可明显提高ＰａＯ２ 和ＳａＯ２,有效改善低氧血症和代谢性酸中毒,减轻ＰＥ－ＳＷＤ时肺组织的损伤,从而可防止ＰＥ－ＳＷＤ向ＳＷ－ＲＤＳ转化。     

加强营养支持对改善高原地区肺心病营养不良患者呼吸和免疫功能的作用

目的：为探讨加强营养支持对高原地区肺心病缓解期营养不良患者呼吸和免疫功能的作用；方法：对３０例高原（海拔２２６０～３２００ｍ）慢性肺心病缓解期营养不良（ＮＤ）患者在加强营养支持前后作了肺功能、吸气肌功能、动脉血气、血清免疫球蛋白和补体测定，并与本地肺心病营养正常（ＮＮ）患者对比；结果：ＮＤ组三头肌皮肤皱褶厚度（ＴＳＦ）、上臂中部周径（ＭＡＭＣ）、口腔最大吸气压（ＰＩｍａｘ）、最大跨膈压（Ｐｄｉｍａｘ）、ＰａＯ２、ＩｇＡ、Ｃ３、Ｃ４均明显低于ＮＮ组（Ｐ均＜０．０１），膈肌张力—时间指数（ＴＴｄｉ）和ＰａＣＯ２明显高于ＮＮ组（Ｐ均＜０．０１），两组ＦＥＶ１．０、ＩｇＧ、ＩｇＭ无差异性。ＮＤ组加强营养支持６周后，体重明显增加，ＴＳＦ、ＭＡＭＣ、ＰＩｍａｘ、Ｐｄｉｍａｘ、ＰａＯ２、ＩｇＡ、Ｃ３、Ｃ４明显提高（Ｐ＜０．０１或＜０．０５），ＴＴｄｉ，ＰａＣＯ２明显下降（Ｐ＜０．０１）；结论：加强营养支持治疗能明显改善高原地区肺心病营养不良患者的呼吸功能和增强其免疫功能。     

胸外伤并发成人呼吸窘迫综合征临床分析

目的探讨胸外伤并发成人呼吸窘迫综合征的临床预测及防治。方法对３２例病人的血气、Ｑｓ／Ｑｔ值及创伤性ＡＲＤＳ发生指数进行回顾分析，对呼吸机相关肺炎进行病原菌及药敏分析。结果本组病例早期ＰａＣＯ２（４．２８±０．６９）ｋＰａ（１ｋＰａ＝７．５ｍｍＨｇ），ＰａＯ２（７．６９±１．３５）ｋＰａ，Ｑｓ／Ｑｔ值２７．６±９．１，创伤性ＡＲＤＳ发生指数值为－３２．００±１１．５０，机械通气时间平均为６．４天，呼吸机相关肺炎感染菌Ｇ－菌占５１．６０％，Ｇ＋菌占３７．１０％，霉菌占１１．３０％，混合感染为３０．６０％。全组死亡率２８．５２％。结论创伤性ＡＲＤＳ发生指数可作为ＡＲＤＳ发生的早期观测及观察其治疗转归的指标。同时需正确处理多发伤及休克，尽量缩短机械通气时间。呼吸机相关肺炎重在预防及合理应用抗菌药物治疗。     

Ventricular performance in congenital left-to-right shunt: temporal Fourier analysis of gated blood-pool data

Using global time-activity curves, the phase and amplitude at fundamental frequency were calculated, and emptying patterns of the right and left ventricles (RV,LV) were evaluated by phase difference [D(phase) = RV phase minus LV phase] and RV/LV amplitude ratio [R(amp)]. In 21 subjects with normal cardiac function, D(phase) was minimal (mean 2.2 +/- 6.1 degrees), regardless of heart rate, and R(amp) was distributed from 0.31 to 0.92 (mean 0.57 +/- 0.20). In 19 patients of ventricular septal defect (VSD), R(amp) remained within the normal range, whereas D(phase) became larger in proportion to the ratio of pulmonary-to-systemic blood flow, Qp/Qs (p less than 0.001). Especially, cases with Qp/Qs over 2.0 showed a significant RV phase lag. By contrast, nine patients with patent ductus arteriosus (PDA), showed no RV phase lag, but--particularly in cases with Qp/Qs greater than 2.0--R(amp) was smaller than normal (p less than 0.001). Thus this method is valuable for pathophysiologic investigation of diseases with L-to-R shunt, and can help in the noninvasive differential diagnosis between VSD and PDA.     

Significance of QT dispersion in the onset of ventricular arrhythmia in patients with heart failure

Prolonged QT dispersion which has been proposed as a marker of repolarisation inhomogeneity, may predispose to ventricular arrhythmias in a variety of cardiac disorders. The aim of this study was to compare some indices of QT dispersion in patients with heart failure compared to normal subjects. We have also tested the hypothesis that QT dispersion is a useful method for identifying the patients at high risk for ventricular arrhythmias. METHODS: There were 84 patients, divided into two groups. In the first group there were 62 patients with heart failure, in the sinus rhythm, while in second group there were 22 sex- and age-matched healthy subjects. Simultaneous 12-channel ECGs were recorded at a paper speed 50 mm/sec. Ventricular arrhythmias were quantified by 24-h Holter ECG and classified according to the Lown classification system. Only those patients with a class IVa, IVb, and V arrhythmia were considered to have complex ventricular premature contractions (PVCs). Measurements of QT, JT, and RR intervals were performed manually. Heart rate corrected QT and JT intervals (QTc and JTc) were calculated by Bazett's formula. RESULTS: RR intervals were similar in both groups (862 +/- 120 vs 840 +/- 86; ns). QT dispersion and rate corrected QT dispersion were significantly greater in heart failure patients than in controls (76 +/- 13 ms vs 37 +/- 11 ms and 89 +/- 21 ms vs 40 +/- 17 ms; p < 0.05). When, on the basis of the existing complex PVCs, heart failure patients were divided into two subgroups, QT dispersion and rate corrected QT dispersion were significantly greater in the subgroup with complex PVCs compared to patients without complex PVCs (84 +/- 14 ms vs 61 +/- 18 ms and 98 +/- 26 ms vs 66 +/- 21 ms; p < 0.05). CONCLUSION: All indices of QT dispersion were significantly higher in heart failure patients. QT dispersion is useful, noninvasive method for identifying heart failure patients at high risk for ventricular arrhythmia.     

QT dispersion in elderly athletes with left ventricular hypertrophy

The purpose of this study was to examine the QT dispersion in elderly endurance athletes with left ventricular (LV) hypertrophy. Sixteen athletes (males, mean age 67.6 +/- 4.5 years) with mild to moderate LV hypertrophy, were compared with 16 age-matched hypertensive patients with similar degree of LV hypertrophy and 16 age-matched healthy sedentary controls. All the participants underwent echocardiogram and 12-lead electrocardiogram. QT dispersion was defined as the difference between maximum and minimum QT intervals in the different leads. QT dispersion was corrected (QTc) for heart rate according to Bazett's formula. The results showed in athletes and hypertensive patients comparable LV mass (258.2 +/- 14.2 vs. 262.4 +/- 16.8 g, ns), which was significantly higher than that of controls (p < 0.001). Trained subjects had QT dispersion (38.6 +/- 10.2 ms) and QTc dispersion (39.4 +/- 11.3 ms) significantly lower than hypertensive patients (QT dispersion: 68.4 +/- 11.4 ms; QTc dispersion: 72.2 +/- 8.4, p < 0.001) and comparable with controls (QT dispersion: 44.3 +/- 8.4 ms; QTc dispersion: 46.2 +/- 6.2 ms, ns). In conclusion, in elderly athletes training-induced myocardial hypertrophy was characterized by a QT dispersion significantly lower than hypertensive myocardial hypertrophy. This could provide a simple and inexpensive screening method for differentiating physiologic from pathologic myocardial hypertrophy in elderly subjects.     

Qt dispersion in soccer players during exercise testing

Screening for cardiac health should involve relevant parameters or indices that are easy and inexpensive to obtain. Various cardiac adaptation mechanisms develop during regular exercise that are affected by many factors, and these are reflected on a surface electrocardiogram. QT dispersion has been considered a surrogate for heterogeneity of repolarization, leading to ventricular arrhythmias. We compared QT parameters between athletes and sedentary subjects. A total of 225 men were assessed, comprising a group of professional soccer players and sedentaries. Each subject underwent supine 12-lead electrocardiographic examinations and exercise testing by ergospirometry. QT parameters were taken at rest and at peak exercise. Peak oxygen consumption was considerably higher in the athletes than in the controls (59.3 +/- 5.6 vs. 44.3 +/- 2.4 ml/kg/min, mean +/- SD, p < 0.001). QT parameters at rest: There were significant differences in heart-rate-corrected rest maximal QT duration (413.9 +/- 50.5 vs. 445.3 +/- 45.7 ms, p < 0.001) and in heart-rate-corrected rest minimum QT duration (380.5 +/- 51.2 vs. 409.5 +/- 46.7 ms, p < 0.001). QT parameters at peak exercise: maximal QT duration at peak exercise (253.9 +/- 20.8 vs. 261.7 +/- 26.2, p = 0.02), QT dispersion at peak exercise (25.2 +/- 9.1 vs. 29.5 +/- 15.8 ms, p = 0.04), heart-rate-corrected QT dispersion at peak exercise (44.6 +/- 16.4 vs. 52.6 +/- 28.3 ms, p = 0.03) differed significantly between professional soccer players and controls. QT dispersion and corrected QT dispersion at peak exercise are lower in athletes than in controls. Athletes and other subjects identified with a long QT interval should be examined at regular intervals.     

浮动胸壁对犬心肺功能的损害及机械通气和肋骨牵引的治疗效果

目的 观察浮动胸壁对心肺功能的影响以及机械通气和肋骨牵引的疗效。方法 杂种1犬16只建立小面积（10cm^2/kg）和大面积（20cm^2/kg）浮动胸壁动物模型，每组8只，用胸腔置管、Swan-Ganz导管、血气分析等观察心排量（CO）、中心静脉压（CVP）、平均动脉压（MAP）、肺动脉压（PAP）、动脉氧分压（PaO2），肺动脉静脉分流分数（Qs.／Qt）及胸膜腔内压等的变化和机械通气、肋骨牵引固定的治疗效果。结果 浮动胸壁模型完成后，均出现反常呼吸，胸腔内压力为负值，未出现软化部分膨出；小面积组动脉血氧饱和度（SaO2）下降（P＜0．05），Qs/Qt下降（P＜0．05）。与治疗前比较，机械通气治疗后小面积组Qs/Qt下降（P＜0．05），CO和SaO2则升高（P＜0．05）；而大面积组SaO2、PaO2明显升同（P＜0．01），Qs/Qt和PaCO2下降（P＜0．05）。结论 浮动胸壁的病理胸腔容积减少为基础，机械通气和肋骨牵引固定是有效的治疗手段，机械通气对大面积浮动胸壁呼吸功能障碍的疗效更好。     

Sensitivity and specificity of radionuclide equilibrium angiocardiography for detection of hemodynamically significant secundum atrial septal defect

To determine the value of gated equilibrium angiography in secundum atrial septal defect (ASD) in children, the first pass pulmonic/systemic flow ratio (Qp/Qs) was compared with diastolic count ratio (DCR) and stroke count ratio (SCR) of the two ventricles. In 50 children we have found a correlation between Qp/Qs and DCR (r = 0.71) and between Qp/Qs and SCR (r = 0.66). For detection of significant atrial shunt (QP/Qs greater than 1.5) the sensitivity of DCR greater than 2 was 0.81 and the specificity 0.75. For SCR greater than 1.5 we sensitivity and specificity values of 0.87 and 0.71 respectively. Left and right ventricular ejection fractions were normal (0.67 +/- 0.08 and 0.50 +/- 0.07).     

高原肺水肿继发急性呼吸窘迫综合征氧动力学变化特点及治疗

目的：探讨高原肺水肿继发急性呼吸窘迫综合征氧动力学变化特点及治疗方法。方法：采用右心漂浮导管及热稀释法,对8例高原肺水肿继发急性呼吸窘迫综合征患者进行了氧动力学监测,并提出治疗方法。结果：监测开始时,右房压（RAP）、肺动脉平均压（mPAP）、肺循环阻力指数（PVRI）、肺内分流（Qs/Qt）明显增加,心输出指数（CI）、氧输送（DO2）、氧耗量（VO2）、氧摄取（O2ext）、氧合指数（PaO2/FiO2）明显减低;监测结束时,RAP、mPAP、PVRI、Qs/Qt明显减低（P〈0.05）,而CI、DO2、VO2、O2ext、PaO2/FiO2明显增加（P〈0.05）,8例患者全部存活。结论：高原肺水肿继发急性呼吸窘迫综合征时氧动力学已发生明显紊乱,病情危重,治疗的关键是早期机械通气,提高氧输送,改善组织氧合。     

Factor analysis of gated cardiac blood-pool data: application to patients with congenital heart disease.

Ventricular emptying was evaluated in patients with congenital heart disease (CHD) with left-to-right (L-R) shunt by factor analysis of gated equilibrium radionuclide angiography. In 36 (95%) of 38 ventricular septal defect patients and 20 (95%) of 21 atrial septal defect patients with small L-R shunt (pulmonary to systemic blood flow, Qp/Qs less than or equal to 2.5), as well as all patent ductus arteriosus patients, two significant cardiac factors corresponding to the ventricles (ventricular factor) and the atria plus large vessels (atrial factor) were extracted. However, in all of nine ventricular septal defect patients with large L-R shunt (Qp/Qs greater than 2.5), two different ventricular factors were determined which corresponded to the right and left ventricles (RV and LV). The RV factor showed a delay of ejection phase compared with the LV factor, and the delay was correlated with the value of Qp/Qs (r = 0.82, P less than 0.01). In eight (80%) of 10 ASD patients with large L-R shunt (Qp/Qs greater than 2.5), RV was described by the two different ventricular factors located in the septal and free-wall regions. The LV was extracted in the same factor as that located in the septal region of RV. This study demonstrates the capability of factor analysis in the pathophysiological investigation of CDH with L-R shunt.     

Sensitivity and specificity of radionuclide equilibrium angiocardiography for detection of hemodynamically significant secundum atrial septal defect

To determine the value of gated equilibrium angiography in secundum atrial septal defect (ASD) in children, the first pass pulmonic/systemic flow ratio (Qp/Qs) was compared with diastolic count ratio (DCR) and stroke count ratio (SCR) of the two ventricles. In 50 children we have found a correlation between Qp/Qs and DCR (r=0.71) and between Qp/Qs and SCR (r=0.66). For detection of significant atrial shunt (QP/Qs>1.5) the sensitivity of DCR>2 was 0.81 and the specificity 0.75. For SCR>1.5 we sensitivity and specificity values of 0.87 and 0.71 respectively. Left and right ventricular cjection fractions were normal (0.67±0.08 and 0.50±0.07).     

QT离散度与高原心脏病心律失常

目的：探讨高原心脏病室性心律失常与ＱＴ离散度的关系;方法：测量６２例高原心脏病不同的心律失常组与６２例正常人的ＱＴ离散度（ＱＴｄ）,计算校正ＱＴ离散度（ＱＴｃｄ）。并对各组进行比较分析;结果：恶性心律失常组较对照组ＱＴｄ显著增高（Ｐ〈０．０１）;潜在恶性心律失常组较对照组ＴＱｄ亦有显著差异;无心律失常组较对照组ＴＱｄ差异无统计学意义;结论：对高原心脏病患者ＱＴｄ值越大,发生恶性室性心律失常危险性越大,测定ＱＴｄ这种简单的方法可用于预测高原心脏病恶性或潜在恶性心律失常的发生。