During last 16 years we have successfully developed the computer assisted vectorcardiogram analysis systems: model TJ Ⅰ, TJ Ⅱ, and TJ Ⅲ, but some technical problems remained unresolved, such as the recognit...During last 16 years we have successfully developed the computer assisted vectorcardiogram analysis systems: model TJ Ⅰ, TJ Ⅱ, and TJ Ⅲ, but some technical problems remained unresolved, such as the recognition accuracy for vectorcardiograms, measurement of the parameters of complicated QRS waves, the ratio of T loop length to width, and the area of spatial vectors etc. A new system, model TJ Ⅳ was designed to resolve these technical problems. The system was equipped with a 586 computer with a CPU of 120 MHz. Special new low noise amplifier was employed and C language was used for programming. Three graph recognition techniques were used to enhance the accuracy of VCG recognition. 32 orthogonal electrocardiograms and vectorcardiograms were displayed and printed, and 566 parameters of vectorcardiograms were calculated. Our results with 150 cases showed that the system had high accuracy of graph recognition, and parameter calculation and the results were essentially consistent with those of manipulative methods. We were led to concluded when compared with TJ Ⅲ system, the new version has higher accuracy of processing and measurement for vectorcardiograms, is able to process more vectorcardiographic parameters, with higher processing speed.展开更多
目的探讨心电向量图(vectorcardiogram,VCG)早期诊断高血压心脏靶器官损害的意义,并分析不同程度高血压心脏靶器官损害的危险因素。方法120例高血压患者均行心电图(electrocardiogram,ECG)、VCG及超声心动图(ultrasound cardiogram,UCG...目的探讨心电向量图(vectorcardiogram,VCG)早期诊断高血压心脏靶器官损害的意义,并分析不同程度高血压心脏靶器官损害的危险因素。方法120例高血压患者均行心电图(electrocardiogram,ECG)、VCG及超声心动图(ultrasound cardiogram,UCG)检查,评估患者的心脏电活动变化及心脏结构变化,并比较ECG与VCG对高血压患者心脏电活动异常的检出情况;按VCG及UCG检查结果对高血压患者的心脏靶器官损害情况分为正常组(VCG、UCG均正常,n=40)、电重构组(VCG异常、UCG正常,n=40)及结构异常组(UCG异常,n=40),收集3组患者一般临床资料[年龄、性别、体质量、身高、体质量指数(body mass index,BMI)吸烟、饮酒、服药、作息、家族史及合并症等]、血生化指标及动态血压指标[包括24 h平均收缩压(24 h mean systolic blood pressure,24 h SBP)、24 h平均舒张压(24 h mean diastolic blood pressure,24 h DBP)、白昼平均收缩压(daytime average systolic blood pressure,DSBP)、白昼平均舒张压(daytime average diastolic blood pressure,DDBP)、夜间平均收缩压(nighttime average systolic blood pressure,NSBP)、夜间平均舒张压(nighttime average diastolic blood pressure,NDBP)、清晨SBP、清晨DBP、24 h SBP负荷、24 h DBP负荷、SBP变异性、DBP变异性、24 h脉压差(24 h mean pulse pressure,24 h PP)、SBP节律及DBP节律],采用单因素及有序logistic回归分析不同程度高血压心脏靶器官损害的危险因素。结果患者中VCG检出心脏电重构较ECG有优势(P<0.05);3组患者的性别、合并糖尿病、高血压病程、规律服药、家族史、血尿酸、24 h SBP、24 h DBP、DSBP、DDBP、NSBP、NDBP、清晨SBP、清晨DBP、24 h SBP负荷、24 h DBP负荷及24 h PP等指标比较,差异有统计学意义(P<0.05);有序logistic回归分析结果显示,NSBP(OR=1.148,95%CI为1.068~1.232,P<0.001)、性别(OR=4.914,95%CI为1.872~12.897,P=0.001)及家族史(OR=4.707,95%CI为1.099~6.392,P=0.030)是心脏靶器官损害的危险因素。结论VCG对高血压患者早期心脏靶器官电重构的检出较ECG具有优势,NSBP、性别及家族史是高血压心脏靶器官损害的危险因素。展开更多
文摘During last 16 years we have successfully developed the computer assisted vectorcardiogram analysis systems: model TJ Ⅰ, TJ Ⅱ, and TJ Ⅲ, but some technical problems remained unresolved, such as the recognition accuracy for vectorcardiograms, measurement of the parameters of complicated QRS waves, the ratio of T loop length to width, and the area of spatial vectors etc. A new system, model TJ Ⅳ was designed to resolve these technical problems. The system was equipped with a 586 computer with a CPU of 120 MHz. Special new low noise amplifier was employed and C language was used for programming. Three graph recognition techniques were used to enhance the accuracy of VCG recognition. 32 orthogonal electrocardiograms and vectorcardiograms were displayed and printed, and 566 parameters of vectorcardiograms were calculated. Our results with 150 cases showed that the system had high accuracy of graph recognition, and parameter calculation and the results were essentially consistent with those of manipulative methods. We were led to concluded when compared with TJ Ⅲ system, the new version has higher accuracy of processing and measurement for vectorcardiograms, is able to process more vectorcardiographic parameters, with higher processing speed.
文摘目的探讨心电向量图(vectorcardiogram,VCG)早期诊断高血压心脏靶器官损害的意义,并分析不同程度高血压心脏靶器官损害的危险因素。方法120例高血压患者均行心电图(electrocardiogram,ECG)、VCG及超声心动图(ultrasound cardiogram,UCG)检查,评估患者的心脏电活动变化及心脏结构变化,并比较ECG与VCG对高血压患者心脏电活动异常的检出情况;按VCG及UCG检查结果对高血压患者的心脏靶器官损害情况分为正常组(VCG、UCG均正常,n=40)、电重构组(VCG异常、UCG正常,n=40)及结构异常组(UCG异常,n=40),收集3组患者一般临床资料[年龄、性别、体质量、身高、体质量指数(body mass index,BMI)吸烟、饮酒、服药、作息、家族史及合并症等]、血生化指标及动态血压指标[包括24 h平均收缩压(24 h mean systolic blood pressure,24 h SBP)、24 h平均舒张压(24 h mean diastolic blood pressure,24 h DBP)、白昼平均收缩压(daytime average systolic blood pressure,DSBP)、白昼平均舒张压(daytime average diastolic blood pressure,DDBP)、夜间平均收缩压(nighttime average systolic blood pressure,NSBP)、夜间平均舒张压(nighttime average diastolic blood pressure,NDBP)、清晨SBP、清晨DBP、24 h SBP负荷、24 h DBP负荷、SBP变异性、DBP变异性、24 h脉压差(24 h mean pulse pressure,24 h PP)、SBP节律及DBP节律],采用单因素及有序logistic回归分析不同程度高血压心脏靶器官损害的危险因素。结果患者中VCG检出心脏电重构较ECG有优势(P<0.05);3组患者的性别、合并糖尿病、高血压病程、规律服药、家族史、血尿酸、24 h SBP、24 h DBP、DSBP、DDBP、NSBP、NDBP、清晨SBP、清晨DBP、24 h SBP负荷、24 h DBP负荷及24 h PP等指标比较,差异有统计学意义(P<0.05);有序logistic回归分析结果显示,NSBP(OR=1.148,95%CI为1.068~1.232,P<0.001)、性别(OR=4.914,95%CI为1.872~12.897,P=0.001)及家族史(OR=4.707,95%CI为1.099~6.392,P=0.030)是心脏靶器官损害的危险因素。结论VCG对高血压患者早期心脏靶器官电重构的检出较ECG具有优势,NSBP、性别及家族史是高血压心脏靶器官损害的危险因素。
