左、右游离壁显性房室旁路顺向型房室折返性心动过速诱发率的差异

顺向型房室折返性心动过速(OAVRT)是预激综合征旁路参与的最常见的心律失常。本组通过分析经成功射频消融证实为左侧或右侧游离壁显性房室旁路的59例患者的电生理检查结果，探讨两侧游离壁显性房室旁路OAVRT诱发率的差异及可能的机制。     

房室折返性心动过速的重整现象

目的:探讨房室折返性心动过速(AVRT)的重整特点及对经典重整概念的质疑。方法:选择41例行射频消融治疗的顺向型AVRT患者,心动过速发作时,在心脏的不同部位进行S2刺激扫描,观察心动过速对S2刺激的重整反应。结果:28例(其中左侧房室旁路19/32例,右侧房室旁路9/9例)经高位右房AS2刺激可以使心动过速重整,39例(其中左侧房室旁路30/32例,右侧房室旁路9/9例)经右心室VS2刺激可以使心动过速重整。其中8例左侧旁路患者从左心房、左心室刺激均能发生重整。重整时,偶联间期与回归周期之和(即代偿间歇)与心动过速周长(CL)的关系有3种不同的表现。结论:重整与刺激部位到折返环的距离密切相关;代偿间歇不仅可以小于CL的2倍,也可以大于或等于CL的2倍。     

阵发性房室或房室结折返性心动过速患者射频消融治疗前后有关心房颤动的研究

心房颤动 (房颤 )是房室旁路参与的房室折返性心动过速 (AVRT )及阵发性房室结折返性心动过速 (AVNRT )患者常见的并发症 ,国外报道发生率为 19%～ 44% ,并因其对显性预激患者具有潜在的导致恶性室性心律失常、血栓栓塞及猝死的危险而倍受重视。射频消融治疗已成为目前治疗AVRT和AVNRT的一线治疗。本研究的目的是总结AVRT和AVNRT患者射频消融治疗前后房颤的发生情况 ,从而分析成功的射频消融慢径及房室旁路对房颤的预防作用。资料和方法对象为 1994年 1月～ 1999年 12月在我院导管室接受射频消融治疗成功的 90例AVRT和AVNRT…     

预激综合征房室旁路无创性定位诊断

房室折返性心动过速时,心房激动的顺序对预激综合征患者房室旁道的定位非常重要。本文通过比较经右胸壁记录的右房电位和经食管记录的左房电位,大致能将游离壁旁路和间隔旁路区分开来。本组无创性房室旁路定位诊断均经心内电生理检查加以证实。     

食管心房调搏对隐匿性房室旁道的诊断价值

隐匿性房室旁道是房室折返性心动过速（Atrial—ventricular reentrant tachycardia，AVRT）常见原因，但仅凭发作AVRT时体表心电图很难确定旁路的定位。经食管心房调搏术（Transesotphaged atrial pacing，TEAP）是临床上常用的无创伤性电生理检查方法，本研究通过应用TEAP诊断隐匿性房室旁道并与射频消融术（Radiofrequen cycathetel ablation，RFCA）诊断结果对比分析，探讨TEAP对隐匿性旁道引起AVRT诊断价值。     

阵发性房室结及房室折返性心动过速导致的人心房有效不应期的变化

目的 :探讨阵发性房室结折返性心动过速 （AVNRT）和房室折返性心动过速 （AVRT）对人心房有效不应期（ERP）的影响。方法 :对 86例住院进行电生理检查和 （或 ）导管射频消融术中出现自发或诱发的 AVNRT和 AVRT患者 ,分别于 AVNRT和 AVRT发生前及发生终止后在 5 0 0 ,4 0 0和 30 0 ms等不同基础周长下测量心房 ERP。结果 :阵发性 AVNRT和 AVRT持续时间分别为 14± 6 m in及 14± 7min。AVNRT和 AVRT终止后即刻心房 ERP缩短 ,与各自心动过速前相比均 P<0 .0 1。该缩短改变可以在 5 m in内恢复。结论 :阵发性 AVNRT和 AVRT可以使人心房 ERP缩短 ,造成短暂心房电重构     

同频率心尖部、心底部右中间隔区刺激鉴别间隔部隐匿性旁路和房室结双径路的作用

在诊断间隔隐匿性房室旁路时，希氏束逆传不应期心室早搏刺激法是目前诊断房室折返性心动过速(AVRT)重要的标准。但行此法检查时要求有持续发作的心动过速、心动过速时的周长保持恒定、心动过速时能够标测出清晰的希氏束电位，因此有时影响了其在临床上的广泛应用。国外学者Martinez—Aiday曾提出窦性心律时分别于心尖部和心底部起搏刺激，测起搏的V波与逆传的心房A波即VA间期的方法，以诊断间隔隐匿性旁路。现就我们采用此方法诊断鉴别的体会汇报如下。     

逆向型房室折返性心动过速1例

宽QRS波群心动过速是心血管病常见的重症和急症,其中,逆向型房室折返性心动过速（AVRT）较少见。AVRT折返环路是以旁路为前传支、以正常房室传导系统为逆传,或由一支旁路下传,另一支旁路逆传;其心室激动的模式与真正的室性心动过速几乎无差别。通过回顾性分析逆向型房室折返性心动过速前后的心电图变化,明确AVRT的诊断需与室性心动过速区分开,临床应予以高度重视。心电图医师需熟悉心脏电生理的基本知识,与临床医师密切配合,在了解病史的基础上全面综合分析,才能及时地做出正确诊断。     

Ⅲ度房室传导阻滞伴完全右束支传导阻滞并发旁路不同比例正传1例

我院发现1例Ⅲ度房室阻滞伴完全右束支阻滞并发旁路不同比例正传,当旁路正传时掩盖Ⅲ度房室阻滞和右束支传导阻滞.     

预激综合征合并完全性房室阻滞的诊断及治疗

目的 报道5例预激综合征合并完全性房室阻滞患者的诊断和治疗。方法 进行心内电生理检查和射频消融旁路。结果 电生理检查未诱发房室折返性心动过速，心房刺激时体表心电图的预激程度无变化。消融阻断旁路前传后，均示完全性房室阻滞。4例患者在消融术后植入永久性起搏器．随访中无心房颤动发作。1例患者放弃对旁路的消融治疗。结论 预激综合征合并完全性房室阻滞是射频消融的适应证。消融前对房室传导功能的评定十分重要。成功消融旁路后应植入永久性起搏器。     

Iatrogenic left pulmonary artery to left atrium fistula

Trans‐catheter balloon angioplasty is a well‐established treatment modality for pulmonary artery (PA) stenosis in children with congenital heart disease. We report a case of an unusual complication where a fistula developed between the left PA and the left atrium during balloon angioplasty in a patient with history of tetralogy of Fallot. This was successfully treated with placement of a covered stent. © 2014 Wiley Periodicals, Inc.     

Relationship of left atrial appendage function to left ventricular function

BACKGROUND: The study was conducted to evaluate the relationship of left atrial appendage function to left ventricular function and to analyze, if left ventricular dysfunction predisposed to left atrial appendage thrombus formation even in the presence of sinus rhythm. METHODS AND RESULTS: The study was conducted in 78 patients with a mean age of 53+/-8.5 years, all of whom were in sinus rhythm. Transesophageal echocardiography was performed to record the left atrial appendage emptying and filling velocity and to look for the presence of spontaneous echo contrast and thrombus. Patients with severe left ventricular dysfunction (Group I--left ventricular ejection fraction < 35%) and patients with moderate left ventricular dysfunction (Group II--left ventricular ejection fraction 35-45%) had lower left atrial appendage emptying velocity (33.6+/-16 and 39.7+/-19.5 cm/s, respectively) and filling velocity (41+/-14.7 and 41+/-17 cm/s, respectively) when compared to patients with preserved systolic function (Group II--left ventricular ejection fraction >45%), who had emptying and filling velocity of 55+/-16 and 56+/-15 cm/s, respectively (p <0.05). Twelve out of 32 (38%) patients with severe left ventricular dysfunction (Group I) and 7 out of 25 (28%) patients with moderate left ventricular dysfunction (Group II) had presence of left atrial appendage thrombus as compared to none of the patients with preserved left ventricular ejection fraction (Group III) (p <0.001). CONCLUSIONS: Patients with left ventricular dysfunction also had left atrial appendage dysfunction as evidenced by lower emptying and filling velocities and had increased incidence of thrombus formation.     

Submitral left ventricular aneurysm compressing the left main coronary artery

This report describes a 43-yr-old black woman who was referred for evaluation of severe mitral regurgitation. Conventional echocardiography revealed a large submitral left ventricular aneurysm. A selective coronary angiography demonstrated compression of the left main coronary artery by submitral aneurysm. Successful surgical repair was performed. Cathet. Cardiovasc. Diagn. 40:173–175, 1997. © 1997 Wiley-Liss, Inc.     

Double-outlet left ventricle

Two cases of double-outlet left ventricle with ventricular septal defects and pulmonic stenosis are described. Both had atrial situs solitus, one with concordant and another with discordant atrioventricular connections. Considering the clinical behaviour of the malformation, the diagnosis is difficult. Although the echocardiographic findings suggest the abnormality, angiocardiography is the best procedure for the accurate diagnosis.