In order to improve the efficacy of modified inferior method or middle method of radiofrequency catheter ablation (RFCA) in the treatment of atrioventricular node reentrant tachycardia (AVNRT), the clinical data of 3...In order to improve the efficacy of modified inferior method or middle method of radiofrequency catheter ablation (RFCA) in the treatment of atrioventricular node reentrant tachycardia (AVNRT), the clinical data of 325 cases of AVNRT from March 1992 to Feb. 2000 being subjected to the treatment of RFCA were retrospectively analyzed. The results showed that the successful rate was increased and recurrence was decreased year by year. In the recent 4 years the effective rate was up to 100 %. The complication of three grade of AVB occurred in 3 % and recurrent rate in 9.1 % before March 1996, but both of them were zero in the last 3 years. The time of RFCA procedure and X ray exposure was significantly reduced. It was concluded that ablating more than 3 targets by modified inferior method or middle method with energy titrating and strict endpoint was the crux of obtaining satisfactory therapeutic effects and preventing recurrence.展开更多
A series of related electrophysiology phenomena can be caused by the occurrence of interpolated ventricular premature contraction.In our recent three-dimensional Lorenz R-R scatter plot research,we found that atrioven...A series of related electrophysiology phenomena can be caused by the occurrence of interpolated ventricular premature contraction.In our recent three-dimensional Lorenz R-R scatter plot research,we found that atrioventricular node double path caused by interpolated ventricular premature contraction imprints a specifi c pattern on three-dimensional Lorenz plots generated from 24-hour Holter recordings.We found two independent subclusters separated from the interpolated premature beat precluster,the interpolated premature beat cluster,and the interpolated premature beat postcluster,respectively.Combined with use of the trajectory tracking function and the leap phenomenon,our results reveal the presence of the atrioventricular node double conduction path.展开更多
The objective of the work is to study the topographic and anatomical characteristics of the atrioventricular node’s artery in complex congenital heart defects.The material for the work was the following:44 specimens ...The objective of the work is to study the topographic and anatomical characteristics of the atrioventricular node’s artery in complex congenital heart defects.The material for the work was the following:44 specimens including hearts of fetuses and children of the first three years having congenital defects and 50 specimens of the hearts of a similar age with normal development as the control.A complex of generally accepted morphological methods was used to identify the conductive system of the heart,its blood supply.According to the data obtained given congenital heart defects,the artery of the atrioventricular node arises from an artery,that determines the type of blood supply to the heart.With the full form of the common atrioventricular canal,the presence of the“U”-shaped bend of the coronary artery at the point of departure of the atrioventricular artery from it is inconstant,which is apparently due to the localization of the atrioventricular node in the embryonic position.The intensity of the lateral branches from the artery of the atrioventricular node to the heart partitions is determined by the hemodynamic features with congenital heart defects.展开更多
Several anatomical,demographic,clinical,electrocardiographic,procedural,and valve-related variables can be used to predict the probability of developing con-duction abnormalities after transcatheter aortic valve repla...Several anatomical,demographic,clinical,electrocardiographic,procedural,and valve-related variables can be used to predict the probability of developing con-duction abnormalities after transcatheter aortic valve replacement(TAVR)that necessitate permanent pacemaker(PPM)implantation.These variables include calcifications around the device landing zone and in the mitral annulus;pre-existing electrocardiographic abnormalities such as left and right bundle branch blocks(BBB),first-and second-degree atrioventricular blocks,as well as bifas-cicular and trifascicular blocks;male sex;diabetes mellitus(DM);hypertension;history of atrial fibrillation;renal failure;dementia;and use of self-expanding valves.The current study supports existing literature by demonstrating that type 2 DM and baseline right BBB are significant predictors of PPM implantation post-TAVR.Regardless of the side of the BBB,this study demonstrated,for the first time,a linear association between the incidence of PPM implantation post-TAVR and every 20 ms increase in baseline QRS duration(above 100 ms).After a 1-year follow-up,patients who received PPM post-TAVR had a higher rate of hospital-ization for heart failure and nonfatal myocardial infarction.展开更多
利用显微镜观察了20例兔心房室结的连续切片。房室结位于冠状窦口前上方,三尖瓣隔瓣的上方,中心纤维体的右侧,形似不规则的三角体。大小为2.81×1.61×0.38mm。有前、中、后三束心房肌分别在房室结的上端、后端和后下端进入结...利用显微镜观察了20例兔心房室结的连续切片。房室结位于冠状窦口前上方,三尖瓣隔瓣的上方,中心纤维体的右侧,形似不规则的三角体。大小为2.81×1.61×0.38mm。有前、中、后三束心房肌分别在房室结的上端、后端和后下端进入结内。房室结主要由 P 细胞和 T 细胞组成,它们分别构成上结区和下结区,后者延续为房室束。副房室结出现率25%,位于房室束穿通部的上方或主动脉根和中心纤维体转折处的房间隔右侧心内膜下。副房室结主要由 P 细胞组成。副结在临床和心电图诊断方面可能有一定的意义。展开更多
本文观察了8例杂种成兔心脏房室结的亚微结构。房室结主要由 P 细胞、T 细胞和少量心肌细胞构成。P 细胞和 T 细胞内有较丰富的高尔基氏器和高电子密度的球形颗粒;结细胞间的特化连接较少,主要见到中间连接;在上述细胞间有较多的胶原纤...本文观察了8例杂种成兔心脏房室结的亚微结构。房室结主要由 P 细胞、T 细胞和少量心肌细胞构成。P 细胞和 T 细胞内有较丰富的高尔基氏器和高电子密度的球形颗粒;结细胞间的特化连接较少,主要见到中间连接;在上述细胞间有较多的胶原纤维和少量的弹性纤维。根据结内细胞的亚微结构特征,讨论了房室结的生理功能。展开更多
文摘In order to improve the efficacy of modified inferior method or middle method of radiofrequency catheter ablation (RFCA) in the treatment of atrioventricular node reentrant tachycardia (AVNRT), the clinical data of 325 cases of AVNRT from March 1992 to Feb. 2000 being subjected to the treatment of RFCA were retrospectively analyzed. The results showed that the successful rate was increased and recurrence was decreased year by year. In the recent 4 years the effective rate was up to 100 %. The complication of three grade of AVB occurred in 3 % and recurrent rate in 9.1 % before March 1996, but both of them were zero in the last 3 years. The time of RFCA procedure and X ray exposure was significantly reduced. It was concluded that ablating more than 3 targets by modified inferior method or middle method with energy titrating and strict endpoint was the crux of obtaining satisfactory therapeutic effects and preventing recurrence.
文摘A series of related electrophysiology phenomena can be caused by the occurrence of interpolated ventricular premature contraction.In our recent three-dimensional Lorenz R-R scatter plot research,we found that atrioventricular node double path caused by interpolated ventricular premature contraction imprints a specifi c pattern on three-dimensional Lorenz plots generated from 24-hour Holter recordings.We found two independent subclusters separated from the interpolated premature beat precluster,the interpolated premature beat cluster,and the interpolated premature beat postcluster,respectively.Combined with use of the trajectory tracking function and the leap phenomenon,our results reveal the presence of the atrioventricular node double conduction path.
文摘The objective of the work is to study the topographic and anatomical characteristics of the atrioventricular node’s artery in complex congenital heart defects.The material for the work was the following:44 specimens including hearts of fetuses and children of the first three years having congenital defects and 50 specimens of the hearts of a similar age with normal development as the control.A complex of generally accepted morphological methods was used to identify the conductive system of the heart,its blood supply.According to the data obtained given congenital heart defects,the artery of the atrioventricular node arises from an artery,that determines the type of blood supply to the heart.With the full form of the common atrioventricular canal,the presence of the“U”-shaped bend of the coronary artery at the point of departure of the atrioventricular artery from it is inconstant,which is apparently due to the localization of the atrioventricular node in the embryonic position.The intensity of the lateral branches from the artery of the atrioventricular node to the heart partitions is determined by the hemodynamic features with congenital heart defects.
文摘Several anatomical,demographic,clinical,electrocardiographic,procedural,and valve-related variables can be used to predict the probability of developing con-duction abnormalities after transcatheter aortic valve replacement(TAVR)that necessitate permanent pacemaker(PPM)implantation.These variables include calcifications around the device landing zone and in the mitral annulus;pre-existing electrocardiographic abnormalities such as left and right bundle branch blocks(BBB),first-and second-degree atrioventricular blocks,as well as bifas-cicular and trifascicular blocks;male sex;diabetes mellitus(DM);hypertension;history of atrial fibrillation;renal failure;dementia;and use of self-expanding valves.The current study supports existing literature by demonstrating that type 2 DM and baseline right BBB are significant predictors of PPM implantation post-TAVR.Regardless of the side of the BBB,this study demonstrated,for the first time,a linear association between the incidence of PPM implantation post-TAVR and every 20 ms increase in baseline QRS duration(above 100 ms).After a 1-year follow-up,patients who received PPM post-TAVR had a higher rate of hospital-ization for heart failure and nonfatal myocardial infarction.
文摘利用显微镜观察了20例兔心房室结的连续切片。房室结位于冠状窦口前上方,三尖瓣隔瓣的上方,中心纤维体的右侧,形似不规则的三角体。大小为2.81×1.61×0.38mm。有前、中、后三束心房肌分别在房室结的上端、后端和后下端进入结内。房室结主要由 P 细胞和 T 细胞组成,它们分别构成上结区和下结区,后者延续为房室束。副房室结出现率25%,位于房室束穿通部的上方或主动脉根和中心纤维体转折处的房间隔右侧心内膜下。副房室结主要由 P 细胞组成。副结在临床和心电图诊断方面可能有一定的意义。
文摘本文观察了8例杂种成兔心脏房室结的亚微结构。房室结主要由 P 细胞、T 细胞和少量心肌细胞构成。P 细胞和 T 细胞内有较丰富的高尔基氏器和高电子密度的球形颗粒;结细胞间的特化连接较少,主要见到中间连接;在上述细胞间有较多的胶原纤维和少量的弹性纤维。根据结内细胞的亚微结构特征,讨论了房室结的生理功能。
