目的探索心脏磁共振(cardiac magnetic resonance,CMR)心肌应变技术在老年男性肥厚型心肌病(hypertrophic cardiomyopathy,HCM)中应用的价值。方法回顾性分析2020年4月至2024年12月在解放军总医院第二医学中心行CMR检查老年男性患者50例...目的探索心脏磁共振(cardiac magnetic resonance,CMR)心肌应变技术在老年男性肥厚型心肌病(hypertrophic cardiomyopathy,HCM)中应用的价值。方法回顾性分析2020年4月至2024年12月在解放军总医院第二医学中心行CMR检查老年男性患者50例,根据是否诊断为HCM分为HCM组24例和对照组26例。使用后处理软件CVI42获得2组左心室及左心房基本功能参数及应变参数,左心室参数包括左心室心肌质量、左心室心肌质量指数、整体纵向应变(global longitudinal strain,GLS)等,左心房参数包括左心房最小容积、左心房最小容积指数、被动应变(passive strain,εe)、左心房的舒张早期峰值负应变率(peak early negative strain rate,SRe)和左心房舒张晚期峰值负应变率(peak late negative strain rate,SRa)等,比较2组左心室及左心房基本功能参数及应变参数。结果HCM组左心室心肌质量、左心室心肌质量指数、左心房最小容积、左心房最小容积指数明显高于对照组,2D和3D的GLS、εe、SRe、SRa明显低于对照组,差异有统计学意义(P<0.05,P<0.01)。2D GLS、SRa及logistic回归模型预测HCM的曲线下面积(area under the curve,AUC)分别为0.887(95%CI:0.766~0.959)、0.740(95%CI:0.597~0.854)、0.929(95%CI:0.820~0.983),敏感性分别为76.92%、57.69%、84.62%,特异性分别为70.83%、83.33%、91.67%,logistic回归模型的AUC、敏感性、特异性均高于2D GLS和SRa。结论CMR心肌应变技术对于老年男性HCM患者的诊断具有较高的评估价值。展开更多
Thermal expansion is crucial for various industrial processes and is increasingly the focus of research endeavors aimed at improving material performance.However,it is the continuous advancements in first-principles c...Thermal expansion is crucial for various industrial processes and is increasingly the focus of research endeavors aimed at improving material performance.However,it is the continuous advancements in first-principles calculations that have enabled researchers to understand the microscopic origins of thermal expansion.In this study,we propose a coefficient of thermal expansion(CTE)calculation scheme based on self-consistent phonon theory,incorporating the fourth-order anharmonicity.We selected four structures(Si,CaZrF_(6),SrTiO_(3),NaBr)to investigate high-order anharmonicity’s impact on their CTEs,based on bonding types.The results indicate that our method goes beyond the second-order quasi-harmonic approximation and the third-order perturbation theory,aligning closely with experimental data.Furthermore,we observed that an increase in the ionicity of the structures leads to a more pronounced influence of high-order anharmonicity on CTE,with this effect primarily manifesting in variations of the Grüneisen parameter.Our research provides a theoretical foundation for accurately predicting and regulating the thermal expansion behavior of materials.展开更多
文摘目的探索心脏磁共振(cardiac magnetic resonance,CMR)心肌应变技术在老年男性肥厚型心肌病(hypertrophic cardiomyopathy,HCM)中应用的价值。方法回顾性分析2020年4月至2024年12月在解放军总医院第二医学中心行CMR检查老年男性患者50例,根据是否诊断为HCM分为HCM组24例和对照组26例。使用后处理软件CVI42获得2组左心室及左心房基本功能参数及应变参数,左心室参数包括左心室心肌质量、左心室心肌质量指数、整体纵向应变(global longitudinal strain,GLS)等,左心房参数包括左心房最小容积、左心房最小容积指数、被动应变(passive strain,εe)、左心房的舒张早期峰值负应变率(peak early negative strain rate,SRe)和左心房舒张晚期峰值负应变率(peak late negative strain rate,SRa)等,比较2组左心室及左心房基本功能参数及应变参数。结果HCM组左心室心肌质量、左心室心肌质量指数、左心房最小容积、左心房最小容积指数明显高于对照组,2D和3D的GLS、εe、SRe、SRa明显低于对照组,差异有统计学意义(P<0.05,P<0.01)。2D GLS、SRa及logistic回归模型预测HCM的曲线下面积(area under the curve,AUC)分别为0.887(95%CI:0.766~0.959)、0.740(95%CI:0.597~0.854)、0.929(95%CI:0.820~0.983),敏感性分别为76.92%、57.69%、84.62%,特异性分别为70.83%、83.33%、91.67%,logistic回归模型的AUC、敏感性、特异性均高于2D GLS和SRa。结论CMR心肌应变技术对于老年男性HCM患者的诊断具有较高的评估价值。
基金Project supported by the National Natural Science Foundation of China(Grant No.62125402).
文摘Thermal expansion is crucial for various industrial processes and is increasingly the focus of research endeavors aimed at improving material performance.However,it is the continuous advancements in first-principles calculations that have enabled researchers to understand the microscopic origins of thermal expansion.In this study,we propose a coefficient of thermal expansion(CTE)calculation scheme based on self-consistent phonon theory,incorporating the fourth-order anharmonicity.We selected four structures(Si,CaZrF_(6),SrTiO_(3),NaBr)to investigate high-order anharmonicity’s impact on their CTEs,based on bonding types.The results indicate that our method goes beyond the second-order quasi-harmonic approximation and the third-order perturbation theory,aligning closely with experimental data.Furthermore,we observed that an increase in the ionicity of the structures leads to a more pronounced influence of high-order anharmonicity on CTE,with this effect primarily manifesting in variations of the Grüneisen parameter.Our research provides a theoretical foundation for accurately predicting and regulating the thermal expansion behavior of materials.
