消融次数对心房组织消融透壁性及肺静脉电隔离性的影响

目的 分析不同消融次数对不同厚度的离体猪心房组织消融透壁率及其对肺静脉电隔离的影响.方法 ①40例新鲜猪心用以制备离体心房组织条.将测量后的心房组织按厚度分为＜2 mm（n=152）、2～4 mm（n=192）和＞4 mm（n=136）三组.每厚度组随机选取一半数量的心房组织分为A、B两组,A组采用双极射频消融钳行1次消融,B组行3次消融.消融透壁的指标是消融时该处同时测定的电阻抗＞100 ohm.分别记录A、B组每次消融透壁的时间.②成年猪30头,随机分为C、D两组,每组15头.C组消融左侧肺静脉及左心耳各1次,消融右侧肺静脉及右心耳各3次.D组则消融左侧心房结构3次,右侧心房1次.消融前后同步记录左心房及肺静脉电位,并起搏肺静脉视左心房是否被起搏.离体及活体消融线标本均固定后切片,使用Masson染色,镜下观察消融处组织学变化及透壁性情况.结果 离体实验A、B两组透壁率分别为51.3％和98.3％.A组不同心房厚度组间单次消融时间有显著差异.B组同一部位多次消融,消融时间递减.活体实验单次及3次消融后肺静脉电隔离率分别为72.2％和100％.结论 使用国产双极消融装置3次消融显著提高心房组织透壁率及肺静脉电隔离率。     

导管迷宫射频消融治疗心房颤动的研究

为探索导管迷宫射频电消融（MPRFCA）治疗心房颤动（房颤）的方法，随机选择7条犬，正中线开胸后在右心房外膜上放置5％氯化乙酰胆碱小棉球，1min后用无齿镊轻夹心房诱发持续性房颤（持续时间＞20min），所有犬MPRFCA术前房颤平均持续1516±509s。参考外科迷宫术设计MPRFCA靶图，在双侧心房的5个部位用射频能量（30W，持续30s）产生彼此分离的5条线性透壁性损伤，每条犬完成MPRFCA分割后重复用乙酰胆碱诱发房颤，其持续时间明显缩短（平均324±209s），与术前比较差异有极显著意义。提示MPRFCA术可明显缩短房颤的持续时间，消除持续性房颤的发生。     

离体猪心双极射频消融的多参数对比研究

目的研究临床条件下多参数双极射频消融在离体猪心上形成的消融灶的形态大小,评价双极射频消融的有效性、安全性。方法在消融功率30 W和消融温度60℃时,多参数条件（间距12-17 mm、时间20-90 s、灌注0和1 000 ml/h）分别进行组合,把离体猪心（共96个,每个组合消融6次）置于水浴37℃的Langendorff心脏离体灌注体系中,使用4 mm的大头双极消融电极在心室心外膜进行消融,测定交汇消融灶的长度、深度、连接率和爆破率。结果时间增加,长度、深度、连接率、爆破率都增加;间距增加,长度增加,深度、连接率、爆破率下降;有灌注时长度、深度、连接率、爆破率增加。12 mm、20 s有灌注时有效性和安全性最好,长度均值为22.17±1.86 mm,深度均值为3.50±0.63 mm,连接率100%,爆破率0%。结论 30 W、60℃时双极消融可以在电极间距12 mm、20 s、有灌注（1 000 ml/h）时形成最稳定的连续损伤。     

功率、时间和间距对离体猪心双极射频消融的影响

目的 研究临床条件下多参数双极射频消融在离体猪心上形成的消融灶的形态大小,评价双极射频消融的有效性和安全性.方法 在预设功率(30 W和40 W)和灌注条件(1250m l/h)下用4 mm的大头双极消融电极对新鲜离体猪心进行消融,电极间距离从12～ 17 mm,时间从20～90 s,测定交汇消融灶的长度、深度、连接率和爆破率.结果 时间增加时,长度、深度、连接率、爆破率都增加;间距增加时,长度增加,深度、连接率、爆破率下降;功率增加时,长度、连接率、爆破率增加,深度减小.12 mm、20 s、30 W,有盐水灌注(1250 ml/h)时双击消融有效性和安全性最好,长度均值为19.89 mm,深度均值为3.94 mm,连接率100％,爆破率6％.结论 双极消融可以在电极间距离12 mm、20 s、30 W、有灌流(1250 ml/h)时形成稳定的交汇消融灶.     

利用射频消融法拔出起搏电极导线的实验研究

探索利用起搏电极导线直接释放射频能量到心肌组织是否可拔出起搏电极 ,多少能量合适。取新鲜猪心脏 ,切成条状心肌组织块 ,放置于盛有 37～ 38℃生理盐水的不锈钢碗中 ,碗底接射频背部电极 ,将单极导线(MedtronicCapsureSP 4 0 2 3)顶端压在心肌组织上 ,释放射频能量 ,方案为 1,2 ,3,4 ,5W ,时间为 3,6 ,9…… 2 1s,双极导线的顶端电极消融方案同单极电极。双极导线 (MedtronicCapsureSP 4 0 92 ,4 5 92 )的环圈电极放电为 8,10 ,12W ,时间为 5 ,10 ,15 ,2 0s消融后测损伤范围。结果 :单极导线放电 1W、12s,损伤范围是 2 .0± 0 .5mm× 1.7± 0 .6mm ,2W、6s,3W、3s其损伤范围分别是 2 .6± 0 .4mm× 2 .2± 0 .3mm ,2 .3± 0 .3mm× 2 .2± 0 .6mm ,4W、5W ,3s可引起明显心肌损伤。双极导线的顶端电极消融损伤范围与单极导线相比无统计学差异 (P >0 .0 5 )。心室双极导线的环圈电极放电 8W、2 0s ,10W、10s ,其损伤范围分别是 6 .3± 0 .6mm× 5 .0± 0 .0mm ,5 .5± 1.3mm× 4 .3± 0 .6mm。心房双极导线的环圈电极消融损伤范围与心室双极导线相比有统计学差异 (P <0 .0 5 )。结论 :利用起搏电极导线直接释放射频能量到心肌组织体外实验是可行的 ,这有可能成为拔除永久起搏导线的一种简单实用方法。     

CARTO电解剖标测系统指导下射频消融室上速的临床研究

目的 评价CARTO电解剖标测系统对射频消融室上速的指导作用.方法 118例室上速患者分为CARTO组（69例）和常规组（49例）,比较两组标测与消融过程的X线曝光时间、手术时间、放电次数、放电时间、成功率及并发症发生情况.结果 118例均完成射频治疗,2例常规射频失败患者转为CARTO指导下成功完成治疗,两组成功率差异无统计学意义.CARTO组与常规组手术时间无差异[（118±36）min比（119±52）min,P＞0.05],但X线曝光时间明显缩短[（9±3）min比（17±6）min,P＜0.05],放电次数显著减少[（4±2）次比（9±3）次,P＜0.05],放电时间显著缩短[（196±73）s比（402±84）s,P＜0.05].两组患者均未发生并发症.结论 CARTO电解剖标测系统指导下射频消融室上速安全有效,可明显减少放电次数和时间,缩短X线曝光时间.     

心房后间隔局灶性房性心动过速的电生理特征及射频消融

目的 探讨起源于心房后间隔及邻近区域局灶性房性心动过速（房速）心脏电生理特点及射频导管消融特点.方法 入选23例患者,男12例,女11例,平均年龄（48.3±19.3）岁,自发或心房程序刺激诱发房速后,分析体表心电图P＆#39;波特点并于后间隔各个部位进行激动标测和射频消融治疗.结果 23例心房刺激均能反复诱发或终止房速,平均周长（346.7±61.8） ms,房速时P＆#39;波时限明显短于窦性心律时P波时限[（86.2±14.0）ms对（115.4±19.9） ms,P＜0.05].体表P＆#39;波表现为Ⅰ导联多呈等电位线,下壁导联呈深倒负向波,aVR和aVL导联呈正向波,V3～W5导联呈负向波.常规激动标测,所有患者于冠状静脉窦口（CSO）附近标测到相对提前的心房激动,其中12例起源于右后间隔,6例起源于CSO及近端,2例起源于心中静脉,3例起源于左后间隔.靶点提前体表P＆#39;波平均（34.4±18.0） ms,放电开始至心动过速终止时间为（6.2±4.2）s,11例患者放电过程中出现交界区心律.所有患者均消融成功,其中3例需应用盐水灌注导管.随访4个月～ 10年,无复发病例及手术相关并发症.结论 后间隔局灶性房速P＆#39;波形态具有特异性,对导管消融定位意义较大.由于解剖的复杂性,部分病例标测和消融困难,需结合右心房后间隔、冠状静脉窦（CS）内和/或其分支、左心房后间隔等多部位标测和/或消融方能获得成功.     

心脏不同部位的微波消融比较

利用２４５０ＭＨｚ微波（固定功率５０Ｗ，消融时间３０秒），对离体猪心脏不同部位组织进行消融比较。结果：左室前壁损伤范围大于左室乳头肌、主动脉瓣和二尖瓣环下以及右侧房室交界区（Ｐ＜０．０５）；室间隔的损伤范围大于右侧房室交界区（Ｐ＜０．０５）；主动脉瓣环下、二尖瓣环下及右侧房室交界区损伤范围之间无显著差异（Ｐ＞０．０５）；５０Ｗ、３０秒的能量可引起左右心房、右室前壁的透壁性损伤，但无穿孔。结论：同等微波条件下，消融心脏不同部位的组织，其损伤范围有显著差异。应依据组织的性质，选择合适的消融功率及时间。     

导管微波消融兔心外膜和犬心内膜房室环部位对心肌损伤的病理学观察

目的 通过经导管途径对兔左室心外膜和犬心内膜房窀环部位的微波消融,观察微波消融对心肌琥珀酸脱氢酶(SDH)活性的影响及对消融位点心肌组织面积和体积的损伤程度.方法 ①日本健康大白兔21只.按体质量随机分为10,20,30 W组,每组7只.采用20%乌拉坦(4 ml/kg)静脉麻醉后暴露心脏,将微波电极轻置于左室前壁心外膜,高压盐水冲注下分别以10,20,30 W消融30 s.取心室肌,按免疫组化法显示SDH,光镜下观察结果 ,用千分尺测量损伤范围,计算损伤面积.②健康杂种犬32只,雌雄不限,按体质量分40,50,60,80 W组,每组8只,设2个时间点,每个时间点4只.采用戊巴比妥钠,按30 mg/kg静脉麻醉,气管插管接呼吸机及心电监护.将消融导管固定于左右心室前/后壁近间隔的房室环处,40,50 W组同时消融左右心室前壁,60,80 W组同时消融左右心室后壁,消融时间分别60,120 s.实验结束后取出心脏,用千分尺测量损伤范围,计算损伤体积,观察是否形成透壁性损伤并进行病理学检查.结果 光镜下,消融区SDH活性产物消失,细胞结构不清晰,呈淡蓝色,与周围组织界限清楚.消融中心酶缺损区损伤直径和损伤面积随消融功率(10,20,30 W)增加而明显扩大,分别为(3.99±0.41),(5.20±0.25),(6.31±0.37)mm和(12.53±2.56),(21.19±3.14),(30.96±3.76)mm2,组间比较差异有统计学意义(F值分别为76.8,58.5,P＜0.01或＜0.05).犬消融后,光镜下可见损伤区心肌呈凝同性坏死,心内膜可见少量附壁血栓形成.在消融的116个消融点中,发生透壁性损伤16个,有5个损伤累及到肺组织,可见心室穿孔的发生.心肌损伤体积随消融功率(40,50,60,80 W)增大而增加,在消融60,120 s时损伤体积分别为(46.7±2.5),(51.1±2.7),(133.2±3.4),(141.8±3.9),(248.5±6.2),(260.3±6.5),(313.7±9.5),(327.4±10.5)mm3,组间比较差异有统计学意义(F值分别为31.16,27.85,P＜0.01),相同功率,消融时间延长,损伤体积加大.结论 微波可经心内膜消融房室环部位接近心外膜的深病灶,微波输出功率增加,消融时间延长,对心肌组织损伤程度增大.     

三维电解剖标测指导疑难右侧游离壁旁路的导管消融

目的应用三维电解剖标测技术详述常规消融无效的右侧游离壁旁路电解剖特征。方法本组共入选17例常规消融无效的右侧游离壁旁路患者,消融失败1～3（1．8±0．6）次。3例在顺向型心动过速下构建右心房电激动模型,14例在右心室心尖部起搏下构建右心房电激动模型。逆向传导的心房最早激动点代表旁路的心房插入端,冷盐水消融最早心房激动点。结果17例患者中,最早激动点距离对应部位三尖瓣环的宽度为9—20（13．6±3．4）mm,较相对部位三尖瓣环的局部激动时间提前18～80（31．5±16．3）ms。共14例患者记录到独立的旁路电位。1例患者在导管标测时阻断旁路逆传,冷盐水局部巩固消融;16例患者冷盐水消融均成功阻断所有旁路的传导,其中1例患者的旁路心房插入端呈广泛分布而行片状消融。无消融术相关并发症。随访了3～41（18．6±12．7）个月,无旁路传导恢复及心动过速发作。结论常规方法消融失败的右侧游离壁旁路可能具有特殊的解剖特征,如旁路在三尖瓣环水平沿心外膜走行,旁路的心房插入部位远离瓣环。三维电解剖标测有助于精确定位旁路的心房插入端并指导消融。     

慢性心房颤动患者消融术后左心房和左心室结构远期变化

目的观察维持窦性心律(窦律)对慢性心房颤动(房颤)射频消融术后患者左心房和左心室结构的影响。方法入选38例慢性房颤行射频消融术的患者,分别于术前、术后1年行超声心动图检查,测量的超声心动图指标为左心房前后径、左心房上下径、左心房左右径、左心房最大容积、左心室舒张末内径、左心室收缩末内径,左心室射血分数,评估房颤有无复发对左心房及左心室重构的影响。结果 31例慢性房颤患者完成随访,随访时间为(13.45±1.46)个月,将其按消融效果分为复发组(15例)和非复发组(16例)。随访结果如下:(1)消融术前复发组与非复发组超声指标的基线资料比较,差异无统计学意义(P0.05)。(2)复发组术后12个月左心房前后径、左心房上下径、左心房左右径、左心房最大容积、左心室舒张末内径、左心室收缩末内径、左心室射血分数与术前比较,差异无统计学意义(P0.05);(3)非复发组消融术后12个月左心房前后径较术前减小[(38.73±3.77)mmvs.(41.86±4.73)mm,P0.01],左心房上下径较术前减小[(58.03±4.31)mmvs.(61.70±3.80)mm,P0.01],左心房左右径较术前减小[(43.93±6.06)mmvs.(46.08±6.62)mm,P0.01],左心房最大容积较术前减小[(75.78±22.27)mLvs.(83.18±24.29)mL,P0.01],左心室舒张末内径较术前减小[(45.85±4.98)mmvs.(48.26±5.36)mm,P0.01]、左心室收缩末内径较术前减小[(28.74±4.27)mmvs.(31.44±5.32)mm,P0.01],左心室射血分数较术前增加[68.03%±4.58%vs.62.75%±7.23%,P0.01],差异有统计学意义。结论维持窦律能使射频消融术后12个月的慢性房颤患者左心房及左心室逆向重构,左心室收缩功能改善。     

已达到消融终点的长程持续性心房颤动复发危险因素分析

目的：探讨已达到消融终点的长程持续性心房颤动（房颤）患者复发的危险因素。方法：纳入达到消融终点的长程持续性房颤患者256例,消融终点定义为双侧肺静脉电隔离,二尖瓣峡部和左心房顶部线性消融双向阻断且碎裂电位消失。根据随访结果将患者分为房颤复发组（n＝43）和无复发组（n＝213）。通过多因素 COX 回归分析探讨房颤复发的独立危险因素。结果：经过（19．5±3．6）个月随访,与无复发组相比,房颤复发组患者右心房内径较大,为（53．31±6．55）mm 对（48．74±5．87）mm;房颤持续时间较长,为（81．83±45．75）个月对（53．16±40．23）个月;左心房内径较大,为（49．85±6．82）mm 对（46．77±5．83）mm,P 均＜0．01。多因素 COX 回归分析发现,左心房内径增大（OR＝1．01,95％CI：1．01～1．28,P ＜0．05）,右心房内径增大（OR＝2．85,95％CI：1．15～7．03,P ＜0．05）、房颤持续时间延长（OR＝1．01,95％CI：1．01～1．02,P ＜0．05）是房颤复发的独立危险因素。结论：除左心房内径和房颤持续时间外,右心房内径增大也是已达到消融终点的长程持续性房颤复发的独立危险因素。     

Prospective randomized comparison of closed cooled-tip versus 8-mm-tip catheters for radiofrequency ablation of typical atrial flutter

INTRODUCTION: Cooled-tip and 8-mm-tip catheters have been found to be more effective than conventional 4-mm-tip catheters for radiofrequency (RF) ablation of common atrial flutter. The aim of this study was to compare the efficacy and safety of cooled-tip and 8-mm-tip catheters for flutter ablation in a randomized, prospective study. METHODS AND RESULTS: In 100 consecutive patients referred for ablation of common atrial flutter, cavotricuspid ablation was performed with a closed cooled-tip catheter (n = 50) or an 8-mm-tip ablation catheter (n = 50). RF current was applied for 60 to 120 seconds at powers of 40 to 50 W with the closed cooled-tip catheter and in a temperature-controlled mode (65 degrees C/70 W) with the 8-mm-tip catheter. The endpoint was achievement of a bidirectional isthmus conduction block. Cross-over was performed after 15 unsuccessful RF applications for each of the catheters. Complete bidirectional isthmus block was achieved in 99% of patients. Cross-over was performed in 11 patients after primary use of the cooled-tip catheter and in 9 patients after primary ablation with the 8-mm-tip catheter. No significant differences were found in the procedure parameters, such as overall RF applications (12.4 +/- 11.3 vs 12.9 +/- 8.6), ablation duration (42 +/- 43 min vs 39 +/- 27 min), and fluoroscopy time (17.0 +/- 18.7 min vs 15.7 +/- 10.7 min). In a mean follow-up of 8.3 months, 1 patient in the cooled-tip group and 3 patients in the 8-mm-tip group had recurrence of common atrial flutter. CONCLUSION: Use of the closed cooled-tip ablation catheter and the 8-mm-tip catheter have equal and high efficacy for RF ablation of common atrial flutter.     

Changes in local wall thickness correlate with pathologic lesion size following radiofrequency catheter ablation: an intracardiac echocardiographic imaging study

INTRODUCTION: High-resolution intracardiac echocardiographic (ICE) imaging can accurately assess wall thickness during radiofrequency (RF) catheter ablation procedures. This study investigated the correlation of changes in wall thickness at the ablation site with pathologic lesion size. METHODS AND RESULTS: ICE image-guided 31 RF applications (30-50 W, up to 120 sec) were performed in five anesthetized closed chest swine (n = 5, body weight 35-60 kg). Twenty-four lesions were delivered in the right and left atria with standard RF; seven lesions were delivered in the left ventricle (LV) with irrigated (30-40 ml/min) RF. Wall thickness and tissue echo density measured by ICE imaging (pre- and 1-minute post-RF delivery) with increased focal echo density following RF deployment in the atria (4.5 +/- 1.5 vs 2.3 +/- 1.0 mm pre-RF) and the LV (9.8 +/- 2.3 vs 6.8 +/- 2.2 mm pre-RF; P < 0.01). The observed changes in wall thickness (DeltaWT) following ablation in the LV were greater than in the atria (3.0 +/- 1.4 vs 2.2 +/- 1.2 mm; P < 0.05). A significant correlation between DeltaWT and lesion depth (ventricular: r = 0.85, P < 0.05; atrial: r = 0.82, P < 0.01) was demonstrated at all ablation sites. Local wall thickness measured post-RF also significantly correlated with lesion depth (r = 0.89, P < 0.01), especially with that of transmural lesions (r = 0.95, n = 23, P < 0.001) at atrial and LV sites. CONCLUSION: Therapeutic RF ablation results in mural swelling and increased echo density. These changes can be detected by ICE imaging and correlate with pathologic lesion size. ICE imaging may be useful in online quantification of lesion size, especially for transmural lesions during clinical catheter ablation procedures.     

房颤射频导管消融术后心功能与左房内径的变化(英文)

目的:观察射频导管消融术(RFCA)治疗心房纤颤(房颤)的疗效及术后心功能和左房内径的变化。方法:回顾分析本院28例有明显临床症状且药物治疗无效,接受RFC治疗的房颤患者的资料。在三维电解剖标测(EAM)系统指导下对该28例房颤患者行射频消融术。术前,术后3、6月用心脏超声仪评价心功能及左房内径的变化;行动态血压监测评价RFCA的疗效;结果:所有患者的肺静脉隔离率为100%。术中术后均未出现严重并发症。随访6个月28例患者中有27例(96.4%)未复发房颤,与术前比较,心脏超声检查示左房内径[(37.3±4.8)mm比(34.1±4.6)mm]明显降低,左室射血分数[(59.8±8.7)%比(64.2±6.8)%]明显提高,P均<0.05。结论:射频导管消融术治疗房颤安全有效,心功能和左房内径均有明显改善。     

Contact sensing provides a highly accurate means to titrate radiofrequency ablation lesion depth

RF Ablation Lesion Depth Estimation Using Contact Sensing . Background: Transmural lesions are essential for efficacious ablation. There are, however, no accurate means to estimate lesion depth. Objective: Explore use of the electrical coupling index (ECI) from the EnSite Contact? System as a potential variable for lesion depth estimation. Methods: Radiofrequency (RF) ablation lesions were created in atria and the thighs of swine using an irrigated RF catheter. Power was 30 W for 20 or 30 seconds intracardiac and 30–50 W for 10–60 seconds for the thigh. Intracardiac, the percentage change in ECI during ablation was compared with transmurality and collateral damage occurrence. For the thigh model, an algorithm estimating lesion depth was derived. Factors included: power, duration, and change in the ECI subcomponents (ΔECI+) during ablation. The ΔECI+ algorithm was compared to one using power and duration (PD) alone. Results: Intracardiac, lesions with ≥12% reduction in ECI were more likely to be transmural (92.3% vs. 59.4%, P < 0.001). Twenty‐second lesions were less likely to cause collateral damage compared to 30 seconds (33% vs. 70%, P = 0.003), while transmurality was similar. With the thigh model, ΔECI+ had a better correlation than the PD algorithm (P < 0.01). Accuracy of the ΔECI+ algorithm was unimproved with inclusion of tip orientation, while PD improved (R²= 0.64). Discussion: Change in ECI provides evidence of transmural versus nontransmural swine intracardiac atrial lesions. A lesion depth estimation algorithm using ECI subcomponents is unaffected by tip orientation and is more accurate than using PD alone. Conclusion: Use of ECI as a factor in a lesion depth algorithm may provide clinically valuable information regarding the efficacy of intracardiac RF ablation lesions. (J Cardiovasc Electrophysiol, Vol. 22, pp. 684‐690, June 2011)     

导管消融治疗持续性心房颤动伴左室功能不全的临床评价

目的评价导管消融治疗持续性心房颤动（房颤）伴左室功能不全的安全性以及临床疗效。方法心力衰竭（心衰）组为30例持续性房颤伴症状性左室功能不全（左室射血分数≤0.45）患者,对照组为年龄、性别、左房大小和房颤持续时间相匹配的60例无心衰的持续性房颤患者,均接受环肺静脉电隔离联合心房碎裂电位消融治疗房颤。比较两组导管消融手术相关参数及严重并发症发生率。对心衰组术前、术后的左房大小、左室功能及内径进行比较。结果两组病例均完成导管消融术,肺静脉隔离率分别为96.67%及98.33%（P=1.00）。两组间消融时间、X线透视时间和严重并发症发生率差异无统计学意义（202.23±39.03 min比201.87±36.80 min,P=0.97;26.80±7.77 min比27.06±7.16 min,P=0.88;3.3%比3.4%,P=1.00）。随访11±1个月,73%的心衰组患者和78%对照组患者维持窦性心律（P=0.61）,两组中分别有40%和42%患者接受再次消融。与术前相比,术后9个月心衰组患者的左室射血分数增加了7.87%±4.72%,左房内径缩小3.77±4.02 mm,左室舒张末期内径减小6.87±5.32 mm,左室收缩末期内径减小8.93±7.60 mm（P均〈0.05）;维持窦性心律者心功能改善程度高于未能维持窦性心律者。结论包括器质性心脏病者在内,对于持续性房颤合并左室功能不全的患者,环肺静脉电隔离联合心房碎裂电位消融的并发症发生率及消融成功率与无左室功能不全的患者相似。房颤合并左室功能不全的患者经导管消融治疗后,左房、室扩大程度减轻,左室射血分数可得到显著提高。     

The effectiveness of a high output/short duration radiofrequency current application technique in segmental pulmonary vein isolation for atrial fibrillation.

AIMS: Segmental pulmonary vein (PV) isolation by radiofrequency (RF) catheter ablation has become a curative therapy for atrial fibrillation (AF). However, the long procedure time limits the wide application of this procedure. The aim of the current study was to compare a novel ablation technique with a high power output and short application time vs. a conventional technique using a low power output and long application time. METHODS AND RESULTS: The study included 90 consecutive patients (age 53+/-10 years; 66 men). Segmental PV isolation was performed by irrigated RF catheter ablation in both groups. In the conventional group (Group 1, 45 patients), the power output was limited to 30 W with a target temperature of 50 degrees C and an RF preset duration of 120 s. In the novel group (Group 2, 45 patients), the maximum power output was preset to 45 W, with a target temperature of 55 degrees C and duration of 20 s. In Group 2, a significant reduction in the PV isolation time (127+/-57 vs. 94+/-33 min, P<0.02), mean fluoroscopy time (73+/-23 vs. 55+/-16 min, P<0.001), and radiation dose was observed. According to the application time and number, Group 2 showed a reduction in RF application time, but a higher number of RF applications were required for creation of complete PV isolation. During a mean follow-up of 15+/-7 months, a total of 74% of patients in Group 1 and 76% of patients in Group 2 demonstrated stable SR. CONCLUSION: Segmental PV isolation using a high power output and short application time is safe and effective in PV isolation in patients with AF. This technique can significantly reduce the procedure and fluoroscopy time compared with a low-power output technique.     

心脏瓣膜手术同期行射频消融术后三尖瓣中、重度反流发生率的研究

目的研究心脏瓣膜手术同期行射频消融术治疗永久性心房纤颤术后三尖瓣中、重度反流的发生情况。方法 758例瓣膜病合并房颤患者,其中行瓣膜手术＋房颤射频消融374例（观察组）,仅行瓣膜手术384例（对照组）。术后随访6~54个月,对比分析两组病例术后三尖瓣中、重度反流的随访数据。结果观察组术后三尖瓣中、重度反流的发生率低于对照组。结论心脏瓣膜置换术同期行射频消融术治疗永久性心房纤颤的远期疗效确切,可降低三尖瓣中、重度反流的发生率,提高患者的心功能和远期生存率。