磁共振扩散加权成像对肝细胞癌化疗栓塞术后疗效的随访价值

目的 探讨磁共振扩散加权成像（DWI）对肝细胞癌（HCC）经导管肝动脉化疗栓塞术（TACE）治疗后疗效评估的应用价值。方法 选取安徽省立医院2014年1月至2016年12月收治的经临床或病理检查确诊的52例HCC患者为研究对象,所有患者均经1～3次TACE治疗,并于TACE术前、术后4～6周行上腹部磁共振平扫及DWI检查,术后4个月行磁共振增强扫描,上述检查均在1周内完成。依据实体肿瘤疗效评估标准（mRECIST）,将病例分为稳定组和进展组,分析TACE术前、术后病灶的坏死、复发转移情况以及表观弥散系数（ADC）值;采用受试者工作特征曲线（ROC）确定鉴别稳定组和进展组的诊断效能以及ADC的最佳截断值。结果 52例HCC患者术前共计检出68个病灶;参照mRECIST标准,评价为稳定病例20例,进展病例32例。术前病灶以稍长T₁和T₂信号为主,DWI序列上呈高信号,ADC图上呈低信号;TACE术后,肿瘤坏死区呈等或稍长T₁、T₂信号,DWI序列上呈等或稍低信号。进展组于T₁WI和T₂WI序列上信号表现多样,DWI序列上呈不均性高信号;稳定组和进展组术前肿瘤病灶的ADC值差异无统计学意义（P>0.05）,稳定组术后ADC值较术前升高（P<0.05）,其手术前后ADC的增加值高于进展组（P<0.05）。ROC分析提示：鉴别稳定组和进展组ADC的最佳截断值为1.28×10^-3 mm²/s,此时曲线下面积为0.773（P<0.05）、灵敏度为76.3%、特异度为68.9%。结论 DWI扫描能够及时、客观的评估HCC患者化疗栓塞术后疗效,具有较高的随访价值。     

磁共振双回波稳态及T2-mapping序列在髋关节撞击综合征关节软骨退变早期的价值研究

目的 研究磁共振双回波稳态(DESS)及T₂-mapping序列在髋关节撞击综合征(FAI)关节软骨退变早期的价值。方法 选取经过临床确诊的30例早期髋关节撞击综合征患者分别行FS-T₂WI、DESS、T₂-mapping检查。结果 DESS发现FAI软骨损伤的阳性率显著高于FS-T₂WI(10/30vs3/30,χ²=4.812,P=0.028),T₂-mapping发现FAI软骨损伤的阳性率也显著高于FS-T₂WI(11/30vs3/30,χ²=5.963,P=0.015),DESS和T₂-mapping发现FAI软骨损伤的阳性率差异无统计学意义(χ²=0.073,P=0.787)。结论 DESS序列显示髋关节软骨退变敏感度较高,T₂-mapping序列成像对FAI关节软骨早期退变进行直观的定量评估,可以发现软骨早期病变,从而能为临床治疗FAI方案提供重要参考依据。     

前置胎盘伴胎盘植入的磁共振诊断价值

目的 探讨磁共振成像对前置胎盘伴胎盘植入的诊断价值。 方法 回顾性分析笔者医院34例因前置胎盘伴阴道流血入院孕妇,均行磁共振T₂WI和DWI扫描,结果经手术及病理证实。测量植入与非植入性胎盘组织的表观弥散系数(ADC),分析T₂WI、DWI序列及两者联合诊断胎盘植入的价值。 结果 34例中,胎盘植入18例。植入性胎盘中植入与非植入部位及非植入性胎盘组织ADC值差异有统计学意义(P值分别为0.000、0.032)。T₂WI和DWI序列及两者联合诊断胎盘植入的敏感度、特异性分别为83.3%、87.5%,66.7%、62.5%和94.0%、63.0%。 结论 DWI对胎盘植入定性及定量诊断有一定参考价值。磁共振T₂WI联合DWI序列可提高诊断胎盘植入的敏感度,减少漏诊率,增加诊断信息。     

急性脑梗死患者脑微出血影响因素分析

目的 探讨脑微出血（CMB）可能的影响因素及其机制。方法 选择铜陵市人民医院神经内科2011年1月至2014年2月收治的74例急性脑梗死患者,进行常规序列（T₁WI、T₂WI、FLAIR）、DWI及T₂-GRE扫描,对CMB进行分区、计数、分级。根据有无CMB,分为CMB组（36例）与无CMB组（38例）。回顾性分析两组患者年龄、吸烟饮酒史、血糖、血压、低密度脂蛋白、同型半胱氨酸水平等情况。结果 CMB组高血压、腔隙性脑梗死患者比例高于无CMB组,差异有统计学意义（χ²=11.013,P=0.010;χ²=6.121,P=0.012）。两组患者血浆生化检查结果进行比较,除了UA,Cr之外,差异无统计学意义（P>0.05）;logistic回归分析显示,高血压（OR=4.66,95% CI：1.22~17.64,P=0.010）、腔隙性脑梗死（OR=4.321,95% CI：1.19~16.75,P=0.012）是CMB的危险因素。结论 CMB与高血压、腔隙性脑梗死密切相关,其中高血压为CMB最重要的可控危险因素,腔隙性脑梗死与CMB可能具有类似的发病机制。     

1.5T磁共振不同序列检出妇科肿瘤盆腔淋巴结转移对比

目的对1.5T磁共振不同序列检出妇科肿瘤盆腔淋巴结转移情况进行分析对比。方法该次研究中,随机选取该院妇科肿瘤盆腔淋巴结转移患者32例所有患者在手术前实施弥散加权成像（DWI）、增强扫描（T1WI＋C）、T1加权序列（T1WI）、T2加权序列（T2WI）序列检查,对所检出的盆腔淋巴结个数及组别分布进行记录。结果应用DWI序列检查时,其妇科肿瘤盆腔淋巴结转移的检出率最高,检出率高达86.4%,与T1加权序列扫描及T2加权序列相比差异有统计学意义。结论 1.5T磁共振在妇科肿瘤淋巴结转移的检查中,应用DWI序列扫描具有较高的检出率,在其阳性判断的过程中,ADC阀值法与短径法两种方法可以任意的选用一种。     

胸部DR高仟伏成像与CT成像在尘肺病诊断中的价值比较

目的 探讨DR高仟伏成像和胸部CT成像在尘肺病诊断中的差异。方法 采用随机数字表法选取2013年6月至2019年12月在合肥市第三人民医院（合肥市职业病防治院）住院的40例尘肺病患者的影像学资料，比较DR高仟伏成像和胸部CT成像对尘肺病患者及其合并症检出率的差异，并评价两种方法在尘肺病分期中的价值。结果 DR高仟伏成像和胸部CT成像对尘肺病检出的一致性较好（Kappa=0.648，P<0.001）。DR高仟伏成像对Ⅰ、Ⅱ、Ⅲ期尘肺病患者的检出率分别为73.1%（19/26）、87.5%（7/8）和100.0%（6/6），而CT成像的检出率分别为92.3%（24/26）、100.0%（8/8）和100.0%（6/6）。对于Ⅰ期尘肺者，CT的检出率明显高于DR高仟伏胸片成像（P=0.003）。CT成像对尘肺病患者肺大泡、胸膜增厚及纵隔淋巴结肿大等合并症的检出率均高于DR高仟伏成像（χ_肺大泡²=4.501，P_肺大泡=0.034，χ_胸膜增厚²=6.275，P_胸膜增厚=0.012，χ_{淋巴结肿大}²=4.507，P_{淋巴结肿大}=0.034）。结论 胸部DR高仟伏成像和CT成像对尘肺病的检出率一致，但胸部CT检查更易早期发现尘肺病患者的影像学改变及肺部合并症。     

IVIM-DWI联合基于T2WI纹理分析术前鉴别直肠癌T2与T3分期的应用价值

目的 探讨体素内不相干运动扩散加权成像（IVIM-DWI）和基于 T₂WI 纹理分析术前鉴别直肠癌 T₂与 T₃分期的价值。 方法 回顾性分析 2016 年 6 月至 2023 年 5 月于中国科学技术大学附属第一医院西区（安徽省肿瘤医院）就诊且经手术病理证实的 105 例直肠癌患者临床资料。根据术后病理 T 分期将患者分为 T₂期组（n=57）和 T₃期组（n=48）。所有患者均于术前行常规 MRI 及IVIM-DWI 检查。测量患者癌灶的 IVIM-DWI 参数表观扩散系数（ADC）、D、D*和 f,并提取 T₂WI 序列的三维纹理特征。比较两组患者IVIM-DWI 参数和纹理参数的差异,建立纹理特征模型、IVIM-DWI 和纹理特征参数的联合模型。用受试者工作特征（ROC）曲线评估各参数和模型术前对直肠癌 T₂和 T₃分期的鉴别效能。 结果 IVIM-DWI 参数中,T₂期组 D 值大于 T₃期组 D 值,T₂期组 f 值小于 T₃期组f 值,差异均有统计学意义（P＜0.05）,ADC 值和 D* 值的差异无统计学意义（P＞0.05）。从 T₂WI 提取的 1 874 个纹理参数中,筛选出 4个具有统计学意义的纹理参数：firstorder_90Percentile、glrlm_LRLGLE、glszm_SZN 和 glszm_SAHGLE。D 值、f 值及 4 个纹理特征参数的曲线下面积（AUC）分别为 0.705,0.664,0.840,0.740,0.801,0.656。纹理特征模型的 AUC 为 0.952,联合模型的 AUC 为 0.956。联合模型的 AUC 大于 D 值、f 值及 4 个纹理特征参数的 AUC,其灵敏度为 93.9%,特异度为 87.5%。 结论 IVIM-DWI 联合基于 T₂WI 纹理分析对术前直肠癌的 T₂期和 T₃期具有良好的鉴别效能,一定程度上弥补常规 MRI 技术之不足。     

右美托咪定辅助臂丛麻醉的镇静效果及安全性

目的 观察右美托咪定辅助臂丛麻醉的镇静效果和安全性。方法 选取2014年2月至2015年10月上海交通大学医学院附属第九人民医院行臂丛麻醉手术的120例患者为研究对象,采用随机双盲法分为A、B、C组,每组40例。A组术前予静脉注射咪达唑仑0.04 mg/kg;B组在阻滞前10 min静脉泵入0.5μg/kg右美托咪定,10 min泵完;C组在阻滞前10 min静脉泵入0.5μg/kg右美托咪定,10 min泵完,同时术前静脉注射咪达唑仑0.04 mg/kg。记录3组患者给药前（T₀）、给药10 min后（T₁）、20 min后（T₂）、30 min后（T₃）、60 min后（T₄）以及手术结束时（T₅）的心率（HR）、平均动脉压（MAP）、血氧饱和度（SpO₂）及警觉/镇静（OAA/S）评分。结果 与B、C两组比较,A组患者的感觉完全阻滞时间、运动完全阻滞时间显著缩短,差异有统计学意义（F=5.133、5.849,P=0.007、0.004）。与给药前（T₀）HR、MAP和OAA/S评分相比,A组仅T₁时显著降低,C组T₁～T₄均显著降低（P均<0.05）;B组各个时刻均保持平稳（P均>0.05）;组间上述各指标比较,A组患者T₁时刻低于B组,C组患者T₁～T₄时刻均低于B组,且T₂～T₄时刻低于A组（P均<0.05）;3组的SpO₂比较,差异无统计学意义（P>0.05）;C组患者术中因心率减慢而给予阿托品治疗的例数多于A、B两组,差异有统计学意义（χ²=7.50,P=0.02）。结论 右美托咪定辅助臂丛神经阻滞具有较高的镇静效果和安全性能。     

认知量表联合颅脑磁共振对维持性透析患者认知功能的评价

目的 探讨简易精神状态量表（MMSE）和蒙特利尔认知评估量表（MoCA）联合颅脑磁共振（MRI）弥散加权成像（DWI）/扩散张量成像（DTI）对透析患者认知功能的评估价值。方法 选择2015年5月至2016年5月于安徽医科大学第二附属医院肾内科进行透析的患者65例,采用MMSE和MoCA评估患者认知功能,MRI扫描脑白质区并计算表观弥散系数（ADC）和部分异向性（FA）量化值;根据MoCA结果分为认知正常组（38例）和认知障碍组（27例）,比较两组患者量表评分、ADC值及FA值的差异性。结果 MoCA检出率高于MMSE,差异有统计学意义（χ²=17.725,P=0.001）,且MMSE和MoCA总分呈正相关（r=0.660,P=0.001）。认知障碍组患者MMSE评分的定向力、记忆力、注意力、语言和总分低于认知正常组,而MoCA评分的执行力、注意力、语言、延迟回忆、定向力和总分均低于认知正常组,差异有统计学意义（P<0.05）;额叶和顶叶ADC值高于正常组,额叶、顶叶、胼胝体及侧脑室FA值低于正常组,差异有统计学意义（P<0.05）。结论 多认知量表联合评估可提高透析患者认知障碍的检出率;且存在认知障碍的透析患者主要表现为执行力、定向力、注意力、语言和记忆力的下降,和大脑额叶、顶叶、胼胝体和侧脑室白质的损伤相对应。     

MR 3D CUBE T2WI序列对膝关节解剖结构显示的价值

目的 探讨MR 3D CUBE T₂WI序列对膝关节解剖结构显示的价值。方法 应用GE Signa HDXt 3.0T超导型MR仪和相控阵线圈对病变组和对照组各30例膝关节行常规2D和 3D CUBE T₂WI序列扫描,比较两种序列图像显示半月板、前、后交叉韧带和关节软骨的解剖结构情况并进行优、良、差分级评价及统计学分析。结果 根据资料分析,3D CUBE T₂WI序列显示前、后交叉韧带和关节软骨方面优于常规2D序列,在半月板的显示方面不及常规2D序列（P均=0.000）。以优、良两级作为满足诊断要求的图像质量评价级别,病变组和对照组于3D CUBE T₂WI序列显示前、后交叉韧带的满意率均达100%,关节软骨对照组为93.33%、病变组为90.00%,而半月板对照组为30.00%、病变组为33.33%。结论 膝关节3D CUBE T₂WI 序列是一种对关节韧带、关节软骨显示敏感的序列,对于半月板的显示不及常规2D序列,建议结合临床选择使用。     

Value of D-Dimers in patients with acute aortic dissection

Objective: To evaluatel the value of D-dimers in patients with acute aortic dissection (AAD). Methods: This study consisted of 16 patients with AAD and 27 non-AAD patients. Serum D-dimets were measured by Sta-Liatest D-DI immunoturbidimetric assay. Results: D-dimer level was higher (P ＜ 0.001) in patients with AAD(7.91 ± 5.52 μg/ml) than that in non- AAD group(1.57±1.24 μg/ml). D-dimer was positive (＞0.4 μg/ml) in all patients with AAD and in 10 control group patients (37%). Among patients with acute AAD, D-dimers tended to be higher in Stanford A than in Stanford B (8.67 ± 4.31 μg/ml vs. 3.24±1.27 μg/ml, P ＜0.01). D-dimer values tended to be higher in more extended disease(3.84 ± 1.65 μg/ml, 8.57 ± 3.58 μg/ml and 11.87 ± 5.69 μg/ml in thoracic aorta, thoracic and abdominal aorta, thoracic and abdominal aorta and iliacal arteries, respectively, P ＜ 0.05 for both 8.57 ± 3.58 and 11.87 ± 5.69 vs. 3.84 ± 1.65 ). Including the control group into the analysis, we found a sensitivity of 100%, a negative predictive value of 100%, and a specificity of 66% and a positive predictive value of 64% for D-dimer in diagnosis of AAD in our patients with suspected AAD. Conclusion: D-dimer was elevated in patients with AAD. A negative D-dimer test result could be useful in excluding AAD.     

Research of combined liver-kidney transplantation model in rats

Objective： To set up a simple and reliable rat model of combined liver-kidney transplantation. Methods： SD rats served as both donors and recipients. 4℃ sodium lactate Ringer＇s was infused from portal veins to donated livers,and from abdominal aorta to donated kidneys, respectively. Anastomosis of the portal vein and the inferior vena cava （IVC） inferior to the right kidney between the graft and the recipient was performed by a double cuff method, then the superior hepatic vena cava with suture. A patch of donated renal artery was anastomosed to the recipient abdominal aorta. The urethra and bile duct were reconstructed with a simple inside bracket. Results： Among 65 cases of combined liver-kidney transplantation, the success rate in the late 40 cases was 77.5%. The function of the grafted liver and kidney remained normal. Conclusion： This rat model of combined liver-kidney transplantation can be established in common laboratory conditions with high success rate and meet the needs of renal transplantation experiment.     

BLOOD PRESSURE CHANGE WITH AGE IN SALT-SENSITIVE TEENAGERS

Objective To observe blood pressure change with age in salt-sensitive teenagers whose salt sensitivity were determined by repeated testing.Methods Salt sensitivity was determined through intravenous infusion of normal saline combined with volume-depletion by oral diuretic furosemide in 55 teenagers. After five years, salt sensitivity was re-examined and subject blood pressure was followed up. Blood pressure changes in salt-sensitive teenagers were compared to that of non-salt sensitive teenagers over five years.Results After 5 years, the repetition rate of salt sensitivity determined by intravenous saline loading is 92.7%. In teenagers with salt sensitivity on the baseline, both the systolic blood pressure increments and increment rates were much higher than non-salt sensitive teenagers (12.7±12.1 mmHg vs. 2.8±5.2 mmHg, P＜ 0.01; 12.2%± 12.0% vs. 2.5% ±4.4%, P＜ 0.001,respectively). There was a similar trend for diastolic blood pressure (8.4 ± 6.4 mmHg vs. 3.7 ± 6.4 mmHg, P = 0.052; 13.2% ±10.6 % vs. 6.8%± 10.1%, P = 0.053, respectively).Conclusions Salt sensitivity determined by intravenous saline loading showed good reproducibility. Blood pressure increments with age were much higher in salt-sensitive teenagers than non-salt sensitive teenagers, especially in terms of systolic blood pressure.     

安心颗粒对急诊经皮冠状动脉介入术后生活质量影响的研究

目的：评价使用安心颗粒对急诊经皮冠状动脉介入术（PPCI）术后生活质量的影响.方法：将160例接受PPCI的急性ST段抬高型心肌梗死患者随机分为安心颗粒组（术前顿服安心颗粒8.8g,术后安心颗粒4.4 g/次,每日2次）和对照组（仅接受基础药物治疗）.所有患者均服用阿司匹林、氯吡格雷和阿托伐他汀.分别在入院时、出院前1d、出院后180 d时,应用心肌梗死多维度量表（MIDAS）、中文版SF-36评价量表对患者生活质量评分.并观察术后30 d以内的出血并发症、血小板减少症发生情况.结果：入院时和出院前1d,两组患者的心肌梗死MIDAS、SF-36量表评分比较无差异（P＞0.05）;出院后180 d时,与对照组比较,安心颗粒组MIDAS、SF-36评分明显减低（P＜0.05）;组内与入院时比较,两组出院前1d、出院后180 d时,MIDAS、SF-36评分均降低（P＜0.05）.两组患者在随访期间均无大量出血、少量出血、重度和极重度血小板减少症发生,安心颗粒组有4例、对照组有7例发生不明显出血（P＞0.05）.两组发生轻度血小板减少症的患者数比较无差异（P＞0.05）.结论：PPCI使用安心颗粒,能改善急性ST段抬高型心肌梗死患者的生活质量,且不增加出血风险.     

The comparative studies of the influences of Urapidil and Nicardipine on sino-atrial node function, atrio-ventricular node function and hemodynamics

Objective:To investigate the influences of urapidil and nicardipine on rabbit sinus function,atrio-ventricular node function and hemodynamics.Methods:Thirty-two Angora's rabbits were selected and randomly divided into four groups.U1 group:urapidil 0.25 mg/kg;U2 group:urapidil 0.5 mg/kg;N1 group:nicardipine 10 μg/kg;N2 group:nicardipine 20 μg/kg.All these medicine were administrated within 30 seconds.Measurements were taken before and after the administration of urapidil or nicardipine for the following data:mean blood pressure(MAP),heart rate(HR),sino-atrial conduction time(SACT),maximal sinoatrial recovery time(SNRTmax)corrected sinus node recovery time(CSNRT),index of sinus node recovery time(SNRTI),Wenckebach A-V conduction frequency (WB),and P-R interval.Results:Significant MAP and HR changes were identified in all of the four groups before and after administration of both urapidil and nicardipine.No significant changes could be found in the rest of the parameters.Intergroup analysis showed that SACT and CSNRT of N1 and N2 groups were shorter than those of the U2 group(P＜0.01);the MAP decreased(P＜0.01)and the HR increased drastically(P＜0.01).Conclusions:Neither urapidil(0.25 mg/kg,0.5 mg/kg)nor nicardipine(10μg/kg,20μg/kg)has any significant influence on rabbit sinus function or rabbit atrio-ventricular node function.Nicardipine could be a better choice than urapidil for parafunctional sinus node patients.     

Expression of OPGmRNA and ODFmRNA in the patients of hip fracture due to osteoporosis

Objective：To investigate the gene expression of osteoprotegerin（OPG） and osteoclast differentiation factor（ODF） in the bone tissue of patients with hip fracture due to osteoporosis. Methods：OPGmRNA and ODFmRNA in the bone tissue in 50 cases of osteoporosis sufferers（over 50 years old） with hip fracture（Observer Group） and 30 cases of hip facture sufferers with no osteoporosis（Control group） were analyzed with the Semi-Quantitative RT-PCR method. Results：The mRNA expressed of ODF, OPG were both high in the patients with hip fracture. In the control group, the expression of OPG mRNA was observed, while the expression of ODF mRNA was very slight. Conclusion：Aged patients contained all signals including OPG, ODF that are essential for inducing osteoclastogenesis and promoting bone resorption.     

The clinicopathological and immuohistochemical analysis of solid-pseudopapillary tumor of the pancreas： report of 9 cases

Objective：To investigate the clinical features, pathological characteristics and immunophenotype of solid-pseudopapillary tumor of the pancreas（SPTP）. Methods：Nine surgically treated cases of SPTP were retrospectively reviewed. Hematoxylin and Eosin（HE） staining and immunohistochemical staining were used to analyze all cases, and the general clinical data was collected. Results：Six patients were asymptomatic except for a palpable mass. Two patients complained of vague-epigastric pain. One patient appeared jaundice. The tumor was encapsulated and solid tissues alternately with cystic tissues. Histologically, the histological structure of solid portion was pseudopapillary with a fibrovascular core. Tumor cells were uniform and medium-sized which were arranged in sheets ets or nests or pseudopapillary patterns. Immunohistochemical studies demonstrated that SPTP proved positive in vimentin（9/9 cases）, AAT（9/9 cases）, NSE（9/9 cases）, ACT（7/9 cases）, CK20（2/9 cases）, CgA（1/9 cases）, S-100（3/gcases）, PR（4/gcases）, Syn（3/9 cases） and CD56（5/9cases）, negative in CEA and ER. Conclusion：SPTP is a tumor predominantly occurring in young women frequently without special symptoms. This tumor has various characteristical histological patterns with different immunophenotype.     

Dynamic Changes in Serum Estradiol and Progesterone levels in Patients of Premenstrual Syndrome with Adverse Flow of Liver-qi

Objective:To probe into the influence of changes of ovarian hormones on the pathogenesis of the specific sub-type premenstrual syndrome(PMS)and reveal partial microcosmic mechanisms of adverse flow of liver-qi.Methods:Estradiol(E2)and progesterone(P)levels in serum were determined at different phases of menstrual cycle by radioimmunoassay.Results:In the group of PMS with adverse flow of liver-qi.the secretive peak value Of E2 and P at the follicular phase significantly decreased,and the secretive peak value at the luteal phase did not come into being.Conclusions:Low E2 and P secretive peak at the follicular phase and absence of secretive peak at the luteal phase is one of the microcosmic mechanisms of PMS with adverse flow of liver-qi.One of the pathophysiologic mechanisms of specific sub-type PMS is probably the continuous low level of E2and P.     

Real-time Three-dimensional Echocardiography in Assessment of Left Ventricular and Right Ventricular Volumes

Real-time three-dimensional echocardiography (RT3DE)is a new ultrasound technique that enables dynamic threedimensional visualization and quantification of the heart in real time. Investigation of feasibility and methodology of RT3DE in determining left ventricular (LV) and right ventricular (RV) volumes, RT3DE was performed in 35 normal adults using Philips SONOS 7500 system with a 2-4 MHz matrix array transducer. The 60°×60° "pyramid" volume database was obtained and analyzed on a TomTec echo workstation. Both LV and RV volumes were calculated with four 3DE methods (i.e. apical 2, 4, 8, and 16-plane) through manually tracing ventricular endocardial borders in end diastole and end systole. Stroke volumes were then calculated. LV volume was also measured by 2DE Simpson's rule using GE VIVID 7 ultrasound machine.     

SCREENING FOR A 21-CHROMOSOME ABNORMALITY IN PREIMPLANTED EMBRYOS OF ELDERLY WOMEN

Increasing maternal age is the only etiological factor unequivocally linked to Down's syndrome in humans. The occurrence rate of newborns with Down's syndrome is about 1/220 in women over 35 years old. However, the occurrence rate in embryos fertilized in vitro, of the elder woman is unclear. Using FISH we screened the number of chromosome 21 in preimplanted embryos of 5 elderly women (average age, 38.4 years) to study the feasibility and necessity of screening trisomy 21 in embryos in patients over 35 years old at the in vitro fertilization (IVF) center.