房室折返性心动过速合并房室结双径现象

目的 分析射频消融术证实的房室帝道（ＡＰ）合并房室结双径（ＤＡＶＮＰ），以了解其电生理特点。方法 以食管心房调博及心内电生理检查，确诊室上速合并房室结双径１２例，并行射频消融枚。结果 ＡＰ合并ＤＡＶＮＰ占ＡＰ的１６．４％（１２／７３），多为陷匿性ＡＰ（１０／１２），其折返途径多为ＡＰ逆传（１０／１２），房室结单一径路前传，房室结快径道不应期及心动过速时ＲＰ’（ＶＡ）与ＲＰ意期，在食道电生理与心内电     

逆传型P波对鉴别房室及房室结折返性心动过速的临床意义

本文对经心脏电生理检查及ＲＦＣＡ证实的慢－快型房室结折返性心动过速（Ｓ－Ｆ型ＡＶＮＲＴ）及房室折返性心动过速（ＡＶＲＴ）与心动过速发作时逆传型Ｐ波（Ｐ′）进行对比分析,寻求对鉴别诊断的价值,以提前对ＡＶＮＲＴ与ＡＶＲＴ诊断的准确性,鉴别要点及治疗对策...     

特殊类型房室结折返性心动过速的电生理机制及其射频消融

报道２例特殊类型的房室结折返性心动过速（ＡＶＮＲＴ），１例为慢－慢型ＡＶＮＲＴ伴起始部多径路逆传；１例为两种不同电生理特性的慢径交替前传、快径逆传构成的ＡＶＮＲＴ。电生理检查均提示房室结三径路。２例病人均于冠状静脉窦口上方消融慢径改良房室结成功，心动过速不再被诱发。随访２个月心动过速均无复发。提示房室结多径路形成的特殊类型ＡＶＮＲＴ，需详细的电生理检查并仔细鉴别方能予以诊断。射频导管消融方法同典型ＡＶＮ－ＲＴ，且安全、有效。     

房室结折返性心动过速患者房室结功能曲线连续 …

分析房室结折返性心动过速（ＡＶＮＲＴ）中房室结功能曲线呈连续性者的电生理特点。将ＡＶＮＲＴ分为房室结功能曲线连续组（Ⅰ组）及房室结功能曲线不连续组（Ⅱ组），行慢径消融，进行消融前后和组间的电生理比较，分析房室结功能曲线呈连续性者的特点。结果：Ⅰ组心房程序刺激对ＡＶＮＲＴ的诱发率仅４２％（５／１２），低于Ⅱ组的６６％（２３／３５）。Ⅰ组房室结前传有效不应期（ＥＲＰ－ＡＶＮ）消融前后无显著变化（２１８     

房屋结折返性心动过速与房室结双径路的相关性研究

目的 探讨房室结折返性心动过速（ＡＶＮＲＴ）与房室结双径路（ＤＡＶＮＰ）的相关性。方法 回顾性分析蒽射频导管消融的单一类型ＡＶＮＲＴ的心内电生理和食管心房调博（ＧＥＡＰ）资料。结果 １０７例单一类型的ＡＶＮＲＴ,存在ＤＡＶＮＰ者１０１例,其中慢－快型ＡＶＮＲＴ９９例,慢－慢型ＡＶＮＲＴ２例;ＤＡＶＮＰ阴性者６例,其中慢－快型ＡＶＮＲＴ１例,慢－慢型ＡＶＮＲＴ３例,快－慢型ＡＶＮＲＴ２例;慢－快型Ａ     

房室结改良术中快径消融的问题剖析

分析１３例慢－快型房室结折返性心动过速（ＡＶＮＲＴ）患者快径消融产生的问题：发生ＩＩＩ度房室传导阻滞（ＡＶＢ）２例（１５．４％）；术后出现促心律失常的不良后果２例（１５．４％），其中１例因仅阻断快径前传，逆传仍保留而使ＡＶＮＲＴ较术前更易发作，另１例快径前传、逆传部被阻断，因合并隐匿性旁道而使房室折返性心动过速更易发生。４例成功而留有Ｉ度ＡＶＢ者，因心电图不正常而给患者带来一定的心理负担。     

国人室上性心动过速的性别特征及逆行P波对其折返径路的诊断价值

对９０例室上性心动过速（ＳＶＴ）患者的性别特征与逆行Ｐ波（Ｐ＇）分析结果发现：国人隐匿性房室旁道（ＣＡＰ）多于房室结双通道（ＤＡＶＮＰ），前者以男性为主，后者以女性为主；约２／３的旁道位于左游离壁（ＬＦＷ），１／３位于间隔及右游离壁，ＬＦＷ男性多见，间隔旁道女性多见；房室折返性心动过速Ｐ＇明显且Ｒ－Ｐ＇≥７０ｍｓ，房室结折返性心动过速多无Ｐ＇或Ｒ－Ｐ＇＜７０ｍｓ；Ｐ＇和Ｒ－Ｐ＇对ＡＶＲＴ和ＡＶＮＲＴ的手术前后诊断符合率为１００％。提示：心电图正常者，ＳＶＴ时Ｐ＇明显的男性，多为ＣＡＰ，且多在ＬＦＷ；ＳＶＴ时无Ｐ＇的女性，多为ＤＡＶＮＰ。     

40例快－慢型房室结折返性室上速的心电图分析

４０例快－慢型房室结折返性室上速的心电图分析王晓梅，薛成相（解放军第三医院心内科心功室宝鸡７２１００４）房室结双径路（ＤＮＮＶＰ）引起的房室结折返性心动过速（ＡＶＮＴＲ）约占室上速（ＡＶＴ）的６０％～７０％，其中快－慢型（Ｆ－Ｓ型）ＡＶＮＴＲ占９０％...     

消融慢径改良房室结出现非阵发性交界区心动过速一例

消融慢径改良房室结出现非阵发性交界区心动过速一例袁文娟１＊侯应龙２杜日映２患者男性，５４岁，有阵发性心悸５年。经心内电生理检查证实为房室结双径路（ＤＡＶＮＰ）引发的慢－快型房室结折返性心动过速（ＡＶＮＲＴ），频率为１８０～２２０ｂｐｍ。采用消融慢径的...     

房室交接区慢电位与房室结慢径的关系及意义

随着临床电生理及射频消融技术的发展,电生理学者们对房室交接区的认识越来越深入。房室结双径路（ＤＡＶＮＰ）被认为是房室结折返性心动过速（ＡＶＮＲＴ）的基础,消融其中的任何一条径路都可以根治ＡＶＮＲＴ。国内外众多的文献表明,由于消融慢径安全易行,并发症少...     

从射频消融探讨房室结双径路的本质和房室结改良的机制

采用两种方法对142例房室结折返性心动过速(AVNRT)患者进行房室结改良。128例慢—快型AVNRT中,83例单纯慢径改良,33例慢径前传和快径逆传同时改良,3例单纯快径逆传改良,7例快径前传和慢径或快径逆传同时改良,2例失败。1例发生永久性Ⅲ度房室传导阻滞;10例快—慢型和4例慢—慢型AVNRT患者均慢径改良成功。总成功率98.6％。平均随访6±4月,4例(2.8％)复发,均再次消融成功。慢径改良后,快径前传有效不应期、维持1:1快径前传最短的心房刺激周期明显缩短(P<0.05),而逆向快径有效不应期、维持1:1快径逆传最短的心室刺激周期无明显变化(P>O.05)。本研究提示:快径和慢径可能是解剖上不同的纤维。慢径前传和逆传可以是同一条纤维,也可以是不同的纤维;快径亦然。     

从慢径消融发生的交界区心律试探房室结双径的本质

７６例慢－快型房室结折返性心动过速（ＡＶＮＲＴ）患者接受房室结慢径消融术。６５例慢径阻断、９例双径存在但ＡＶＮＲＴ不能诱发、２例快径阻断。慢径阻断后，除快径的前传有效不应期（ＥＲＰ）缩短（２８７．０±７９．０ｍｓｖｓ３４４．０±８７．０ｍｓ，Ｐ＜０．０１）外，房室传导的文氏点、２１阻滞点、室房传导的１１点、快径逆传ＥＲＰ、前传和逆传功能不应期均无明显改变。共放电８４１次，其中无交界区心律的３１７次放电，无一次消融成功。６５例慢径阻断者，交界区心律减少或消失。以上结果提示快径和慢径可能是两条各具电生理特性的传导纤维。     

Effects of atropine on induction and maintenance of atrioventricular nodal reentrant tachycardia.

The electrophysiologic effects of atropine were studied in 14 patients with dual atrioventricular (AV) nodal pathways and recurrent paroxysmal supraventricular tachycardia (PSVT). During PSVT, all patients used a slow pathway (SP) for antegrade and fast pathway (FP) for retrograde conduction. Atropine enhanced both SP antegrade and FP retrograde conduction, shown by a decrease in paced cycle lengths (atrial and ventricular) producing AV and ventriculoatrial block. Five patients had induction of sustained PSVT before and after atropine. Seven patients failed to induce or sustain PSVT before atropine, because of retrograde FP refractoriness. All seven had induction of sustained PSVT after atropine due to facilitation of FP retrograde conduction. Two patients had only single atrial echoes before atropine, reflecting SP antegrade refractoriness. After atropine, sustained PSVT was inducible in one, and nonsustained in the other, PSVT cycle length could be compared in seven patients before and after atropine and decreased from 383 +/- 25 to 336 +/- 17 (p less than 0.05). Thus, in patients with dual AV nodal pathways, atropine facilitated SP antegrade and FP retrograde conduction, shortened cycle length of PSVT and potentiated ability to sustain PSVT.     

Electrophysiological mechanisms of conversion of typical to atypical atrioventricular nodal reentrant tachycardia occurring after radiofrequency catheter ablation of the slow pathway

This report presents an adult patient with conversion of typical to atypical atrioventricular nodal reentrant tachycardia (AVNRT) after slow pathway ablation. Application of radiofrequency energy (3 times) in the posteroseptal region changed the pattern of the atrioventricular (AV) node conduction curve from discontinuous to continuous, but did not change the continuous retrograde conduction curve. After ablation of the slow pathway, atrial extrastimulation induced atypical AVNRT. During tachycardia, the earliest atrial activation site changed from the His bundle region to the coronary sinus ostium. One additional radiofrequency current applied 5 mm upward from the initial ablation site made atypical AVNRT noninducible. These findings suggest that the mechanism of atypical AVNRT after slow pathway ablation is antegrade fast pathway conduction along with retrograde conduction through another slow pathway connected with the ablated antegrade slow pathway at a distal site. The loss of concealed conduction over the antegrade slow pathway may play an important role in the initiation of atypical AVNRT after slow pathway ablation.     

从慢慢型和慢快型房室结折返性心动过速电生理特性的差异分析折返环的不同

目的从慢慢型房室结折返性心动过速（AVNRT）和慢快型AVNRT的电生理特性的差异分析两型AVNRT间折返环的不同.方法在500例AVNRT患者中的59例慢慢型和60例慢快型之间,比较部分电生理特性的异同;同时在部分慢慢型和慢快型患者中应用2种方法（1）比较起搏时和心动过速时的HA间期的长度;（2）比较心动过速时心室刺激重整心动过速的不同.比较下传共径（LCP）的异同.结果慢慢型的前传慢径和逆传慢径有明显不同的传导时间;慢慢型的逆传慢径与慢快型的逆传快径有明显不同的传导时间和递减特性;和慢快型相比,2种方法均显示慢慢型有较长的LCP.结论 （1）慢慢型AVNRT中前传慢径和逆传慢径的传导时间明显不同;慢慢型较慢快型有较长的下传共径;（2）研究结果支持慢慢型AVNRT可能应用房室结的右侧后延伸和左侧后延伸分别形成心动过速的前传和逆传支而形成折返.     

Multiple anterograde atrioventricular node pathways in patients with atrioventricular node reentrant tachycardia

Objectives. This study sought to investigate electrophysiologic characteristics and possible anatomic sites of multiple anterograde slow atrioventricular (AV) node pathways and to compare these findings with those in dual anterograde AV node pathways.Background. Although multiple anterograde AV node pathways have been demonstrated by the presence of multiple discontinuities in the AV node conduction curve, the role of these pathways in the initiation and maintenance of AV node reentrant tachycardia (AVNRT) is still unclear, and possible anatomic sites of these pathways have not been reported.Methods. This study included 500 consecutive patients with AVNRT who underwent electrophysiologic study and radiofrequency ablation. Twenty-six patients (5.2%) with triple or more anterograde AV node pathways were designated as Group I (16 female, 10 male, mean age 48 ± 14 years), and the other 474 patients (including 451 with and 23 without dual anterograde AV node pathways) were designated as Group II (257 female, 217 male; mean age 52 ± 16 years).Results. Of the 21 patients with triple anterograde AV node pathways, AVNRT was initiated through the first slow pathway only in 3, through the second slow pathway only in 8 and through the two slow pathways in 9. Of the five patients with quadruple anterograde AV node pathways, AVNRT was initiated through all three anterograde slow pathways in three and through the two slower pathways (the second and third slow pathways) in two. After radiofrequency catheter ablation, no patient had inducible AVNRT. Eleven patients (42.3%) in Group I had multiple anterograde slow pathways eliminated simulataneously at a single ablation site. Eight patients (30.7%) had these slow pathways eliminated at different ablation sites; the slow pathways with a longer conduction time were ablated more posteriorly in the Koch's triangle than those with a shorter conduction time. The remaining seven patients (27%) had a residual slow pathway after delivery of radiofrequency energy at a single or different ablation sites. The patients in Group I had a longer tachycardia cycle length, poorer retrograde conduction properties and a higher incidence of multiple types of AVNRT than those in Group II.Conclusions. Multiple anterograde AV node pathways are not rare in patients with AVNRT. However, not all of the anterograde slow pathways were involved in the initiation and maintenance of tachycardia. Radiofrequency catheter ablation was safe and effective in eliminating critical slow pathways to cure AVNRT.     

多种类型房室结折返性心动过速的电生理特点

目的 探讨多种类型房室结折返性心动过速（AVNRT）的电生理特征及消融体会。方法 回顾性分析成功行射频导管消融的113例AVNRT病人的临床和心内电生理资料。结果 113例AVNRT患者中6例存在多种类型AVNRT,其中存在2种、3种和4种类型AVNRT者各占2例,共有8种类型AVNRT;2例存在MAVNP,其余4例DAVNP阳性;均在慢径路区域行射频消融,放电时出现交界性早搏和/或心律,放电次数,功率、时间和X线曝光时间与同期慢-快型AVNRT相似,术后应用阿托品或异丙基肾上腺素未再诱发室上性心动过速,亦无回波,术中和术后均无房室传导阻滞,随访2.0-25.5月,无1例复发。结论 多种类型AVNRT并不少见,中径路既有逆传功能,也具有前传功能,多种类型AVNRT的射频消融类似于慢-快型AVNRT,安全有效。     

下位法射频消融慢径路改良房室结治疗室上性心动过速23例

用下位法射频消融慢径路改良房室结治疗房室结折返性心动过速(AVNRT)18例,房室折返性心动过速(AVRT)5例.AVNRT中16例为慢—快型,1例快—慢型,1例慢—快型与快—慢型并存,18例慢径路全部阻断成功.AVRT中1例显性预激,4例隐性预激,有5例慢径路和3例房室旁路消融成功.射频放电时21例出现结性心律.无严重并发症出现.AVNRT病人中随仿1—15个月有1例复发,第二次射频成功.认为下位法射频消融阻断慢径路成功率高,并发症少.     

Differential effects of adenosine on antegrade fast pathway,antegrade slow pathway,and retrograde fast pathway in atrioventricular nodal reentry

Adenosine has a potent negative dromotropic effect. However, comparative effects of adenosine on the three pathways of atrioventricular (AV) nodal reentry remain unclear. In this study, we sought to determine the effects of adenosine on the antegrade fast, antegrade slow, and retrograde fast pathway conduction in patients with AV nodal reentrant tachycardia (AVNRT). Twenty patients with common slow-fast AVNRT (mean cycle length 360 +/- 49 ms) were studied. The effects of adenosine on the antegrade slow pathway and on the retrograde fast pathway conduction were determined during sustained AVNRT and constant right ventricular pacing at identical cycle lengths (mean 360 +/- 49 ms), respectively. Incremental doses of adenosine were rapidly administered: initial dose of 0.5 mg, followed by stepwise increases of 0.5 or 1.0 mg given at 5-min intervals until termination of AVNRT or second-degree ventriculoatrial block occurred. After the antegrade slow pathway conduction was selectively and completely ablated by radiofrequency catheter ablation, the effect of adenosine on the antegrade fast pathway conduction was evaluated. The dose-response curve of adenosine and the dose of adenosine required to produce AV or ventriculoatrial block among the representative three conduction pathways were compared. The dose-response curve for the effect of adenosine on the antegrade fast pathway lies to the left and upward to that of the effect of adenosine on the antegrade slow pathway which in turn lies to the left and upward to that of the retrograde fast pathway. The mean dose of adenosine required to produce conduction block at antegrade fast, antegrade slow, and retrograde fast pathways were 1.4 +/- 0.5, 4.2 +/- 1.6, and 8.5 +/- 2.6 mg, respectively (p < 0.01). Adenosine has a differential potency to depress antegrade fast, antegrade slow, and retrograde fast pathway conduction in patients with AVNRT. The depressant effect of adenosine on the antegrade fast pathway is more potent than that on the antegrade slow pathway which in turn is more potent than that on the retrograde fast pathway conduction.     

多型房室结折返性心动过速的机制和射频导管消融

目的分析多型房室结折返性心动过速（AVNRT）并存的电生理机制和射频导管消融结果。方法18例经电生理检查后行射频导管消融的多型AVNRT患者。慢快型和慢慢型AVNRT的消融方法为首选消融前传慢径（房室结右侧后延伸）,快慢型AVNRT的消融方法为消融最早慢径逆传心房激动部位。消融成功的标准为消除1：1前传慢径,消除快慢型AVNRT的逆传慢径,不能诱发任何类型AVNRT。结果11例在消融前的电生理检查中诱发出2种类型AVNRT,均在三尖瓣环与冠状静脉窦口之间（房室结右侧后延伸）成功消融。7例在电生理检查中诱发出1种类型,消融此型后又诱发出另外1种类型,其中4例在房室结右侧后延伸进一步消融成功,另3例均经左侧后延伸进一步消融成功。消融术后随访6个月至8年,18例均无复发。结论对于大多数多型AVNRT,房室结右侧后延伸可能为其折返环的主要基质,消融可成功治愈多型AVNRT。在少部分多型AVNRT中,左侧后延伸与右侧后延伸可能分别作为不Ⅻ类型AVNRT折返环的主要基质,需要分别消融才能成功治愈。