新生儿缺氧缺血性脑病血浆肿瘤坏死因子-α与降钙素基因相关肽水平变化的研究

目的探讨肿瘤坏死因子－α（ＴＮＦ－α）和降钙素基因相关肽（ＣＧＲＰ）在新生儿缺氧缺血性脑病（ＨＩＥ）中的变化及临床意义。方法采用放射免疫分析法对３８例ＨＩＥ患儿和１８例健康足月新生儿血浆ＴＮＦ－α与ＣＧＲＰ水平进行了同期动态观察。结果ＨＩＥ患儿急性期ＴＮＦ—α,ＣＧＲＰ水平分别为（１．１２±０．４２）ｎｇ／ｍｌ,（８８．９２±２３．１６）ｎｇ／ｍｌ;恢复期分别为（０．６１±０ ．１８）ｎｇ／ｍｌ,（６８．３９±１９．３２）ｎｇ／ｍｌ;对照组分别为（０．５４±０．１５）ｎｇ／ｍｌ,（６６． ２± １４．５４） ｎｇ／ｍｌ。急性期血浆 ＴＮＦ－ α和 ＣＧＲＰ水平较恢复期显著增高（ Ｐ＜ ０． ０１）,并明显高于同期对照组水平（ Ｐ ＜０．０１）,恢复期与正常对照组无显著差异,急性期不同程度 ＨＩＥ与对照组 ＴＮＦ— α,ＣＧＲＰ水平比较,重度ＨＩＥ组ＴＮＦ—α,ＣＧＲＰ分别为（１．２８±０． ４１）ｎｇ／ｍｌ,（１１８．１２ ± ３０．２５）ｎｇ／ｍｌ;中度ＨＩＥ组分别为（０．９５±０．３）ｎｇ／ｍｌ,（８６．４９±２４．３６）ｎｇ／ｍｌ,轻度ＨＩＥ组分别为（０．６３±０．１９）ｎｇ／ｍｌ,（６８．３±１８．３８）ｎｇ／ｍｌ,?     

胎粪吸入综合征及并发持续动脉高压的心功能变化

探讨胎粪吸入综合征（ＭＡＳ）及并发持续肺动脉高压（ＰＰＨＮ）患儿的心功能变化。应用ＳＳＤ６５０－Ａｌｏｋａ超声多谱勒诊断仪检测４０例正常新生儿和ＭＡＳ患儿的心功能。结果表明：ＭＡＳ患儿左心功能的ＥＦ％（５３．６２）较对照组（６２．１４）,Ａ／Ｅ（０．７６）较对照组（１．１５）均低和右心功能ＣＯＬ／ｍｉｎ（０．８５）较对照组１．１０及,Ａ／Ｅ（０．７８）较对照组１．２２均明显降低,Ｐ均〈０．０５或０     

经皮球囊肺动脉瓣成形术后右室舒张功能的研究

应用超声心动图测试３６例单纯肺动脉瓣狭窄（ＰＳ），经球囊扩张法（ＰＢＰＶ）治疗４～７年后的右室舒张功能，并和同期经外科瓣膜切开的ＰＳ病例相对照，从而为ＰＢＰＶ方法学选择提供中、长期随访资料。结果，ＰＢＰＶ组中Ｅ峰流速、Ｅ／Ａ流速比、Ｅ峰面积分数、Ｅ／Ａ面积比、舒张期前１／３相面积、Ｅ峰减速时间大于未经治疗组（Ｐ＜０．０１）；Ａ峰流速、Ａ峰面积分数小于未治疗组（Ｐ＜０．０１）。而在ＰＢＰＶ组与外科手术组间差异无显著意义（Ｐ＜０．０５）；在ＰＢＰＶ组中，选用球／瓣比率１．３２±０．０７及１．４９±０．０４的患儿，其右室舒张功能改善效果较为满意。结果提示，ＰＢＰＶ治疗后中、远期右室舒张功能明显改善，并与外科瓣膜切开法获得相同的效果。另外，采用球／瓣为１．３左右进行ＰＢＰＶ是值得推荐的。     

新生大鼠缺氧缺血性脑病脑组织内脂质过氧化改变及丹参保护作用探讨

为探讨ＨＩＥ脑组织脂质过氧化的改变及丹参的保护作用,用生后七日ＳＤ大鼠制成ＨＩＥ模型,在模型后不同时刻检验脑组织内丙二醛（ＭＤＡ）及谷胱甘肽过氧化物酶（ＧＳＨ－ＰＸ）的动态变化,利用丹参进行实验性治疗。结果显示（１）ＨＩＥ后 ２小时ＭＤＡ显著升高（１．７１±０．１９,Ｐ＜０．０１）,１２小时达高峰（１．９７±０．２９,Ｐ＜０．０１）７２小时后恢复正常（１．３２±０．０９,Ｐ＞０．０５）;ＧＳＨ－ＰＸ２小时显著降低（１．２９±０．４３,Ｐ＜０．０１）,以后渐升高,但 ４８小时（２．２２±０．８１）与对照组（３．３４±０．３４）相比仍有统计学差异（Ｐ＜０．０５）,７２小时恢复正常（２．４５±０．９０,Ｐ＞０．０５）;丹参治疗组ＭＤＡ显著降低（１．３９±０．３７,Ｐ＜０．０１）,ＧＳＨ－ＰＸ显著升高（２．４２±０．６２,Ｐ＜０．０５）。表明脑组织内脂质过氧化增强、抗氧化减弱参与ＨＩＥ的发病机制,丹参具有抗氧化作用,能减轻脑组织水肿、出血及坏死,有临床应用价值。     

先天性心脏病患儿血浆内皮素及降钙素基因相关肽的临床研究

目的　了解先天性心脏病患儿血浆降钙素基因相关肽（ＣＧＲＰ）及血浆内皮素（ＥＴ）的变化,探讨其在先天性心脏病继发的病理生理改变中的作用及其临床意义。方法　左向右分流型先天性心脏病患儿２９ 例,其中１１例成功地行修补术,正常对照组２５ 例。用放射免疫均相竟争法分别检测血浆ＣＧＲＰ及ＥＴ水平。结果　先天性心脏病患儿术前血浆ＣＧＲＰ较对照组低（Ｐ＜ ０．０１）,而ＥＴ较对照组高（Ｐ＜ ０．０１）;患儿术后血浆ＣＧＲＰ较术前有增高趋势,但差异不显著（Ｐ＞ ０．０５）,而其ＥＴ 较术前低（Ｐ＜ ０．０５）;先天性心脏病患儿血浆ＣＧＲＰ与ＥＴ成直线负相关（ｒ＝ － ０．７１　Ｐ＜ ０．０１）。结论　左向右分流型先天性心脏病患儿血浆ＣＧＲＰ的降低与ＥＴ的增高可能共同参与了肺动脉高压的形成。     

慢性心力衰竭患儿内皮素与降钙素基因相关肽的临床研究

为探讨内皮素（ＥＴ）、降钙素基因相关肽（ＣＧＲＰ）在慢性心力衰竭（简称心衰）中的作用，用放免法测定３８例心衰患儿与３０例心功能正常儿童血浆ＥＴ与ＣＧＲＰ水平。发现心衰时ＥＴ升高，ＣＧＲＰ降低（Ｐ均＜０．０１）。心功能越差，ＥＴ升高越明显。不同病因所致的心衰，其ＥＴ、ＣＧＲＰ水平无显著性差异。心衰时ＥＴ与ＣＧＲＰ呈显著负相关（ｒ＝－０．６４，Ｐ＜０．０１）。提示，ＥＴ、ＣＧＲＰ是参与心衰发病的重要体液因素，二者之间失衡可能是心衰发生、发展的重要原因。     

扩张性心肌病儿童的左心舒张功能改变：附21例报告

采用多普勒超声心动图测量了２１例扩张性心肌病（ＤＣＭ）儿童与２０例正常对照儿童的二尖瓣多普勒充盈参数。结果显示,与正常对照组儿童相比,ＤＣＭ组患儿中,１８例（８５．７％）表现为Ｅ峰最大速度（Ｅ）、Ｅ峰与Ａ峰最大速度之比（Ｅ／Ａ）均减低（Ｐ〈０．０５）,Ｅ峰减速时间（ＤＴＥ）延长（Ｐ〈０．０１）,３例（１４．３％）表现为Ｅ增大,Ｅ／Ａ〉２,ＤＴＥ明显缩短,其心功能均为ＮＹＨＡⅢ级,结果表明,ＤＣＭ组     

婴幼儿哮喘与T辅助细胞亚群功能失衡研究

目的探讨Ｔ辅助细胞（Ｔｈ）亚群功能失衡在婴幼儿哮喘发病中的作用及其影响因素。方法酶联免疫吸附试验方法，对２０例哮喘患儿和１５例健康对照者外周血单个核细胞（ＰＢＭＣ）分别经植物血凝素（ＰＨＡ）和脂多糖（ＬＰＳ）刺激后，培养上清液中各细胞因子含量进行测定。结果经ＰＨＡ刺激后哮喘组Ｔｈ产生ＩＦＮγ、ＩＬ２水平明显低于正常对照组（ｔ′＝４．１５，４．０７；Ｐ均＜０．０１），而ＩＬ４、ＩＬ６、ＩＬ１０水平则显著升高（ｔ′＝４．７３，５．９１，３１８，Ｐ均＜０．０１）。经ＬＰＳ刺激后，哮喘组单核巨噬细胞产生ＩＬ１０水平明显高于正常对照组（ｔ′＝５．６０，Ｐ＜０．０１）而ＩＬ１２水平则降低（ｔ′＝３．３４，Ｐ＜０．０１）。相关分析发现ＩＦＮγ与血清ＩｇＥ水平呈高度负相关（ｒ＝－０．６６４，Ｐ＜０．０１），ＩＬ４、ＩＬ１０与ＩｇＥ呈高度正相关（ｒ＝０．７７６，０７４０；Ｐ＜０．０１）。结论哮喘患儿生成Ｔｈ１类细胞因子不足，Ｔｈ２类因子增多；单核巨噬细胞产生ＩＬ１０增多，ＩＬ１２减少，导致Ｔｈ１／Ｔｈ２功能失衡     

取样容积位置对检测肺动脉血流时间间期的影响

在２９例左向右分流的先天性心脏病患儿中,将取样容积（ＳＶ）置于肺动脉中不同位置,记录肺动脉血流频谱,测量心室射血前期（ＰＥＰ）射血时间（ＥＴ）,加速时间（ＡＴ）,加速度（ＡＣＣ）,Ｖ（平均流速）Ｆ（Ｆ＝ＡＣＣ×ＰＥＰ／ＥＴ）等参数,根据肺动脉／主动脉血流时间间期比估测肺动脉压（ＰＡＰ）,结果显示,不同ＳＶ位置的ＰＥＰ,ＰＶ,ＡＴ,ＡＣＣ,ＥＴ,ＰＥＰ／ＡＴ,Ｖ,Ｆ间存在显性差异（Ｐ〈０．０５）,     

缺氧缺血性脑病新生儿血浆内皮素和降钙素基因相关肽水平动态观察

目的探讨内皮素（ＥＴ）和降钙素基因相关肽（ＣＧＲＰ）在新生儿缺氧缺血性脑病（ＨＩＥ）中的变化及临床意义。方法采用放射免疫法对３６例ＨＩＥ患儿和１８例健康足月新生儿血浆ＥＴ和ＣＧＲＰ水平进行了同期动态测定。结果ＨＩＥ患儿急性期血浆ＥＴ和ＣＧＲＰ水平较恢复期明显增高（Ｐ＜０．０１）,并明显高于同期对照组水平（Ｐ＜０．０１）,恢复期与正常对照组无显著性差异。急性期不同程度ＨＩＥ及对照组之间ＥＴ,ＣＧＲＰ水平比较表明,重度组明显高于对照组、轻度组及中度组,中度组高于对照组和轻度组,轻度组与对照组无显著性差异。急性期患儿血浆ＥＴ和ＣＧＲＰ呈直线正相关（ｒ＝０．３８,Ｐ＜０．０５）。结论ＥＴ和ＣＧＲＰ参与了新生儿缺氧缺血性脑病的病理生理过程。ＥＴ的增高可能是促发ＨＩＥ脑损伤的一个重要因素,而ＣＧＲＰ增高在ＨＩＥ病程中对脑损伤可能具有一定保护作用。     

Right Ventricular Function in Children with Bronchial Asthma: A Tissue Doppler Echocardiographic Study

Asthma is the most common cause of respiratory disability among children. Patients with severe bronchial asthma can experience cor pulmonale later in life, but little is known about the function of the right ventricle early in the disease. This study aimed to investigate the right ventricular function in children with bronchial asthma as detected by tissue Doppler echocardiography. This case-control study compared 60 asthmatic children ages 5 to 15 years between attacks (study group) with 60 apparently healthy children (control group). All the children were subjected to full history-taking, complete physical examination, measurement of peak expiratory flow rate (PEFR), chest x-ray, electrocardiography (ECG), echocardiographic examination, and both conventional and tissue Doppler study. The results of the tissue Doppler study examining the right ventricular diastolic function showed that peak E′ velocity (10.08 ± 2.8 cm/s), peak A′ velocity (5.7 ± 2.5 cm/s), E′/A′ ratio (1.77 ± 0.58 m/s), and isovolumetric relaxation time (IVRT) of the lateral tricuspid annulus (138.9 ± 30.7 m/s) among the asthmatic patients differed significantly from those among the control subjects (12.4 ± 2.3, 7.8 ± 2.1 cm/s; 1.58 ± 0.32, and 91.1 ± 32.6 m/s, respectively). In addition, the E′ velocity and IVRT of the lateral tricuspid annulus were significantly different among the mild, moderate, and severe cases (P < 0.001). It is concluded that although the clinical and conventional echocardiographic findings of the asthmatic children were apparently normal, the tissue Doppler echocardiographic study showed right ventricular dysfunction that is positively correlated with the severity of asthma. These findings signify the diagnostic value of tissue Doppler echocardiography for the early detection and monitoring of such deleterious effects among asthmatic patients.     

Assessment of Ventricular Functions by Tissue Doppler Echocardiography in Children with Asthma

Patients with asthma develop pulmonary hypertension due to recurrent hypoxia and chronic inflammation, leading to right heart enlargement with ventricular hypertrophy. Patients with severe asthma can experience cor pulmonale later in life, but little is known about ventricular function during the early stages of the disease. This study aimed to investigate ventricular functions in asymptomatic children with asthma as detected by conventional echocardiography and tissue Doppler echocardiography (TDE). Fifty-one pediatric patients (mean age 10.4 ± 2.2 years) with asthma and 46 age- and sex-matched healthy children (mean age 10.9 ± 2.4 years) were studied. All subjects were examined by conventional echocardiography and TDE, and they had pulmonary function tests on spirometry. The right-ventricular (RV) wall was statistically (p = 0.01) thicker among asthmatic patients (4.7 ± 1.5 mm) compared with healthy children (3.6 ± 0.4 mm). However, conventional pulsed-Doppler indices of both ventricles did not differ significantly between asthmatic patients and healthy children (p > 0.05). The results of TDE examining RV diastolic function showed that annular peak velocity during early diastole (E′), annular peak velocity during late diastole (A′) (16.4 ± 1.8 and 5.1 ± 1.4 cm/s, respectively), E′/A′ ratio (3.2 ± 0.7), isovolumetric relaxation time (67.7 ± 10.2 ms) and myocardial performance index (48.1 % ± 7.0 %) of the lateral tricuspid annulus among asthmatic patients differed significantly (p = 0.01) from those of healthy children (13.2 ± 2.3, 8.2 ± 2.0 cm/s, 1.6 ± 0.5, 46.2 ± 8.7 ms, and 42.0 % ± 5.7 %, respectively). Only peak expiratory flow (PEF) rate from the pulmonary function tests was negatively correlated with the E′/A′ ratio of the tricuspid annulus (r = ?0.38, p = 0.01). This study showed that although the findings of clinical and conventional echocardiography were apparently normal in children with asthma, TDE showed subclinical dysfunction of the right ventricle, which is negatively correlated with PEF. These findings signify the diagnostic value of TDE in the early detection and monitoring of such deleterious effects among asthmatic patients.     

支气管哮喘儿童血清25-（OH）D3和总免疫球蛋白E的变化

目的：研究支气管哮喘儿童血清25-羟维生素D3［25-（OH）D3］和总免疫球蛋白E（TIgE）的变化及临床意义。方法采用放射免疫分析法,检测30例支气管哮喘、40例喘息性支气管炎患儿及40例正常对照儿童血清25-（OH）D3及TIgE含量,比较3组间其血清含量的差异。结果支气管哮喘组血清25-（OH）D3含量（18±3 ng/mL）明显低于喘息性支气管炎组（43±3 ng/mL）和正常对照组（43±3 ng/mL）,且TIgE含量（192±16 IU/mL）明显高于喘息性支气管炎组（123±14 IU/mL）和正常对照组（118±15 IU/mL）,差异均有统计学意义（P＜0.01）。支气管哮喘组血清25-（OH）D3与TIgE呈负相关（r=-0.783,P＜0.01＝,喘息性支气管炎组、正常对照组血清25-（OH）D3与TIgE均无相关性。结论血清25-（OH）D3缺乏可能是导致儿童支气管哮喘发作的原因。血清25-（OH）D3水平增高可以抑制IgE的过度表达,这可能成为预防和治疗支气管哮喘等过敏性疾病的一种新的有效途径。     

Acute loads applied to the right ventricle: Effect on left ventricular filling dynamics in the presence of an open pericardium

To determine whether diastolic ventricular interdependence mechanisms would act in the presence of an open pericardial sac, as during cardiac surgery, moderate acute right ventricle afterload increases were applied to eight dogs with the chest and pericardium open while left ventricular filling dynamics were being assessed by Doppler echocardiography. Dogs were studied under basal conditions and after acute banding of the main pulmonary artery tightened to produce a 100% increase in right ventricular systolic pressure. With banding, the left ventricular filling velocity ratio (E/A), as assessed by Doppler echocardiography of mitral inflow, changed from a baseline value of 1.32 ± 0.05 to 1.16 ± 0.03 (p < 0.02), suggesting a restrictive pattern to early left ventricular filling, which is differed to that during the second half of diastole. Isovolumic relaxation time, measured as the time interval between aortic valve closure and mitral valve opening, assessed by M-mode echocardiography of both valves, was prolonged, though not significantly, from 63.3 ± 2.5 ms to 69.4 ± 2.9 ms, by banding of the pulmonary artery. E wave deceleration time, a filling variable influenced by chamber pressure/volume relations, was shortened by pulmonary artery banding, changing from 75.1 ± 1.7 ms to 68.0 ± 1.8 ms (p < 0.01). It was concluded that pressure loads applied to the right ventricle restricted early left ventricular filling. Prolonged relaxation and altered pressure–volume chamber relations were the diastolic interdependence mechanisms involved that proved to be acting even under open pericardium conditions.     

先天性心脏病肺动脉高压手术前后右心功能变化和治疗

目的 了解先天性心脏病左向右分流导致的重度肺动脉高压对右心功能的影响以及手术矫治后右心功能的恢复状态。方法 对室间隔缺损(室缺)合并重度肺动脉高压(全肺循环阻力增加)的40例患儿，用心导管的方法进行术前、术后5～7年右心功能、肺循环的血流动力学随访测定。结果 术前右心心搏指数、作功指数、心排指数显著高于术后；术前右房压、右室收缩压及舒张压、肺动脉压力和阻力均增高，缺损修补后右室舒张压恢复正常，收缩压的降低与肺动脉压力下降有关；大型室缺左向右分流重度肺动脉高压右心功能不全系继发性右室高排出量心力衰竭，且伴有舒张功能障碍。结论 治疗心力衰竭不宜首选正性心肌收缩药物；降低肺动脉压力、减少左向右分流、根治心内畸形是合理的选择；术后右室收缩压持续不能恢复至正常水平，提示继发性肺血管梗阻性病变存在。     

哮喘患儿支气管诱导痰液中炎细胞变化的临床研究

目的研究支气管哮喘患儿急性发作期及其缓解期支气管诱导痰液中炎细胞变化及临床意义。方法选择2002-02—2002-12在中国医大二院儿童哮喘门诊就诊的哮喘患儿,其中哮喘急性发作期34例;哮喘缓解期30例;健康对照组22例。比较哮喘不同病程之间以及不同病程与正常儿童之间支气管诱导痰液细胞成分的差异。结果哮喘患儿急性发作期支气管诱导痰液中,中性粒细胞占细胞总数的百分比明显高于缓解期及正常对照组(均P<0.01)。哮喘急性发作期、缓解期诱导痰液中嗜酸细胞占总数的百分比均明显高于正常对照组,差异显著(P<0.01)。结论支气管哮喘是一种慢性气道炎症性疾病,在不同发病时期气道内的炎细胞变化不同。     

Assessment of right ventricular diastolic filling parameters by Doppler echocardiography

BACKGROUND: Right ventricular diastolic function has been evaluated in various diseases by the pulsed Doppler technique. Right ventricular diastolic filling parameters show changes with age, heart rate and respiration. Evidences of diastolic left and right ventricular dysfunctions have been reported by echocardiographic studies in asthmatic patients. In the present study, before and after treatment of asthma the right ventricular diastolic filling parameters were compared in children with moderate asthma by Doppler echocardiography (a non-invasive technique). METHODS: The study group consisted of 20 children (eight girls, 12 boys) with asthma. During the present study these patients were treated with inhaled steroid and beta-2 agonist daily. Before treatment all patients were evaluated by Doppler echocardiography. At 4-6 weeks after treatment 15 patients that had shown improvement in their symptoms according to the symptom score were also evaluated by Doppler echocardiography. RESULTS: The mean age was 8.6 +/- 2.69 years and mean period of symptoms were 56.4 +/- 35.8 months. When compared with results of echocardiography before and after treatment, the right ventricular diastolic filling parameters (acceleration time: P < 0.01, deceleration time: P < 0.01 and isovolumetric relaxation time: P < 0.05) were found to be significantly different. CONCLUSIONS: We observed significant improvement of right ventricular diastolic filling parameters by Doppler echocardiography after treatment in children with asthma.     

Impact of Obstructive Sleep Apnea on Global Myocardial Performance in Children Assessed by Tissue Doppler Imaging

This study aimed to assess the impact of obstructive sleep apnea (OSA) due to adenotonsillar hypertrophy (ATH) on the global myocardial performance in children using tissue Doppler imaging (TDI) and to evaluate the reversibility of the disorder after adenotonsillectomy (AT). The study included 42 children with OSA due to ATH (mean age, 5 ± 3.14 years) as the study group and 45 age- and sex-matched healthy children (mean age, 5.2 ± 3.08 years) as the control group. Polysomnography and echocardiography were performed. Indexed left ventricular mass (LVMi), pulmonary artery systolic pressure, mean pulmonary artery pressure (mPAP), and pulmonary vascular resistance (PVR) were calculated by echocardiography. Tissue Doppler imaging was used to determine the left ventricular and right ventricular myocardial performance index (MPI) of patients and control subjects before and after AT. The patients were classified into mild OSA (apnea-hypopnea index [AHI] 1–5; n = 18)] and moderate to severe OSA (AHI >5; n = 24) according to polysomnography findings. All the children in the control group had an AHI less than 1. They were treated using AT, then reevaluated by polysomnography and echocardiographic examination 6 to 8 months after surgery. Results are described as mean ± standard deviation. The patients with OSA had higher pulmonary artery systolic pressure, mPAP, PVR, LVMi, and right ventricular diastolic diameter than the control subjects. The patients with moderate to severe OSA showed more prominent changes than the patients with mild OSA, but the latter still differed significantly from the control subjects. The TDI-derived right ventricular MPI and left ventricular MPI measurements of the patients with OSA were higher (mean, 0.40 ± 0.08 vs 0.28 ± 0.01; p < 0.001) than those of the control subjects and (0.45 ± 0.05 vs 0.32 ± 0.05; p < 0.001) and correlated well with AHI and mPAP. In addition, mPAP was significantly correlated with AHI. Postoperatively, relief of OSA was validated by polysomnography, and a repeat of the echocardiographic parameters showed no significant differences between the patients and the control subjects. Tissue Doppler imaging can detect the subtle, subclinical changes in cardiac performance that occur in OSA due to adenotonsillar hypertrophy. Such changes generally are reversible after surgical treatment.     

Comparison of Tissue Doppler Imaging with MRI T2* and 24-Hour Rhythm Holter Heart Rate Variability for Diagnosing Early Cardiac Impairment in Thalassemia Major Patients

Objectives: Cardiology follow up is important in thalassemia major patients. The object of this study is to define parameters which can be used in the early detection of cardiac impairment. Material and Methods: Forty seven beta thalassemia major patients (mean age 16.3 ± 4.47 years; 22 boys, 25 girls) whose left ventricular systolic functions were normal and a healthy control group of fifty age and gender matched children were included in the study. M-mode echocardiographic measurements, systolic and diastolic functions with PW and tissue Doppler and heart rate variabilities (HRVs) were compared between the two groups. The patients were also grouped according to MRT2*, ferritin and left ventricular diastolic diameters (LVDds) to compare the echocardiographic and Holter parameters among them. Results: None of the children in the study group had symptomatic congestive heart failure. PW Doppler late diastolic forward flow in pulmonary artery was higher in the thalassemia group when compared with the control group (P = 0.01) indicating decreased compliance of the right ventricle. While the systolic and diastolic functions were normal, all the HRV parameters in the thalassemia group were significantly lower than the control group (P = 0.005). Conclusions: Significant decrease in HRV and increase in PW late diastolic forward flow in pulmonary artery in the absence of systolic or diastolic dysfunction, points out that these parameters can be useful in detection of early cardiac impairment.     

支气管哮喘患儿心功能变化及其临床意义

目的：探讨支气管哮喘患儿发作期左、右心功能变化及其与哮喘严重程度的关系。方法：用美国Acuson128XP/10型彩色多普勒超声诊断仪对24例危重、极危重哮喘患儿(危重组)及40例非危重哮喘患儿(普通组)进行左、右心功能测定,并与34例正常儿童(对照组)进行比较。结果：非危重组哮喘患儿在发作期以右心舒张功能受损为主,右室收缩功能亦受损,左心收缩及舒张功能正常;危重组哮喘患儿以左心收缩功能受损为主,左室舒张功能受损,右心收缩及舒张功能亦受损。结论：支气管哮喘患儿存在一定程度的心功能受损,并与哮喘严重程度密切相关。