Electrophysiology study and radiofrequency catheter ablation (RFCA) were performed in 26 patients with refractory sustained ventricular tachycardia (VT). After induction of VT, 12-lead electrocardiogram (ECG) was reco...Electrophysiology study and radiofrequency catheter ablation (RFCA) were performed in 26 patients with refractory sustained ventricular tachycardia (VT). After induction of VT, 12-lead electrocardiogram (ECG) was recorded and QRS morphology and axis of induced VT were studied to identify the origin of VT. The precise site of VT origin were localized by pace mapping and activation mapping carefully. RF energy was delivered through a big-tip deflectable electrode catheter when the earliest site of endocardial activation and a high-frequency and low-amplitude potential of Purkinje fiber, preceding surface QRS by more than 25 ms, were identified and / or a pace map was obtained showing identical QRS complexes in at least 11 of 12 ECG leads. VTs were ablated successfully in 24 of 26 patients (success rate was 92%). For successful ablation, it is essential that the pace map QRS morphology in 12 leads should be identical with that in spontaneous or induced VT as far as possible in performing pace mapping. Pace mapping is safe, simple and has no unfavourable effect on hemodynamics although it takes longer time. Activation mapping takes shorter time and has a high success rate. QRS configuration in spontaneous VT can help to localize the site of VT origin. Deliberate mapping at the site suggested to bo the origin of VT by surface ECG can shorten the duration of mapping and increase the success rate of RFCA. RFCA of VT in patients without structural heart disease is effective, safe, and has a high success rate, so it may be considered as an early therapy for these patients.展开更多
Background Radiofrequency catheter ablation （RFCA） has been established as an effective and curative therapy for ventricular tachycardia （VT） and severely symptomatic premature ventricular contraction （PVC） from...Background Radiofrequency catheter ablation （RFCA） has been established as an effective and curative therapy for ventricular tachycardia （VT） and severely symptomatic premature ventricular contraction （PVC） from the outflow tract in structurally normal hearts. This study aimed to investigate electrophysiologic characteristics and effects of RFCA for patients with idiopathic VT and symptomatic PVC originating from the valve annulus. Methods Characteristics of body surface electrocardiogram （ECG） and endocardiogram in a successful RFCA target were analyzed in 16 patients with idiopathic VT and symptomatic PVC originating from the valve annulus. Additionally, the ECG characteristics of VT or PVC were compared with those of manifest Wolff-Parkinson-White （WPW） syndrome originating from the same site of origin in 15 patients. Results Thirteen patients were successful, 2 recurrent and 1 failed. The recurrent cases underwent successful ablation the second time guided by the Ensite 3000 mapping system. In all patients with the WPW syndrome, the characteristics of QRS morphology were well matched with those of the VT and PVC that originated from corresponding sites of origin. Conclusions RFCA is an effective curative therapy for VT and There are specific characteristics in ECG and the ablation site accessory pathway＇s algorithm. symptomatic PVC originating from the valve annulus. could be located by means of the WPW syndrome展开更多
In patients with structural heart disease, ventricular tachycardia (VT) worsens the clinical condition and may severely affect the shortand long-term prognosis. Several therapeutic options can be considered for the ma...In patients with structural heart disease, ventricular tachycardia (VT) worsens the clinical condition and may severely affect the shortand long-term prognosis. Several therapeutic options can be considered for the management of this arrhythmia. Among others, catheter ablation, a closed-chest therapy, can prevent arrhythmia recurrences by abolishing the arrhythmogenic substrate. Over the last two decades, different techniques have been developed for an effective approach to both tolerated and untolerated VTs. The clinical outcome of patients undergoing ablation has been evaluated in multiple studies. This editorial gives an overview of the role, methodology, clinical outcome and innovative approaches in catheter ablation of VT.展开更多
BACKGROUND With an increased number of surgical procedures involving the mitral annular region,the risk of mitral valve prolapse(MVP)has also increased.Previous studies have reported that worsening of MVP occurred ear...BACKGROUND With an increased number of surgical procedures involving the mitral annular region,the risk of mitral valve prolapse(MVP)has also increased.Previous studies have reported that worsening of MVP occurred early after radiofrequency catheter ablation(RFCA)at papillary muscles in ventricular tachycardia(VT)patients with preoperative MVP.CASE SUMMARY We report a case where MVP and papillary muscle rupture occurred 2 wk after RFCA in a papillary muscle originated VT patient without mitral valve regurgitation or prolapse before.The patient then underwent mitral valve replacement with no premature ventricular contraction or VT.During the surgery,a papillary muscle rupture was identified.Pathological examination showed necrosis of the papillary muscle.The patient recovered after mitral valve replacement.CONCLUSION Too many ablation procedures and energy should be avoided.展开更多
Ventricular tachycardia(VT) is a crucial cause of sudden cardiac death(SCD) and a primary cause of mortality and morbidity in patients with structural cardiac disease. VT includes clinical disorders varying from benig...Ventricular tachycardia(VT) is a crucial cause of sudden cardiac death(SCD) and a primary cause of mortality and morbidity in patients with structural cardiac disease. VT includes clinical disorders varying from benign to lifethreatening. Most life-threatening episodes are correlated with coronary artery disease, but the risk of SCD varies in certain populations, with various underlying heart conditions, specific family history, and genetic variants. The targets of VT management are symptom alleviation, improved quality of life, reduced implantable cardioverter defibrillator shocks, prevention of reduction of left ventricular function, reduced risk of SCD, and improved overall survival. Antiarrhythmic drug therapy and endocardial catheter ablation remains the cornerstone of guideline-endorsed VT treatment strategies in patients with structural cardiac abnormalities. Novel strategies such as epicardial ablation, surgical cryoablation, transcoronary alcohol ablation, pre-procedural imaging, and stereotactic ablative radiotherapy are an appealing area of res-earch. In this review, we gathered all recent advances in innovative therapies as well as experimental evidence focusing on different aspects of VT treatment that could be significant for future favorable clinical applications.展开更多
BACKGROUND Dizziness is a common symptom in adults and usually due to peripheral causes affecting semicircular canal function or central causes affecting the pons,medulla,or cerebellum.Arrhythmia is a recognized cause...BACKGROUND Dizziness is a common symptom in adults and usually due to peripheral causes affecting semicircular canal function or central causes affecting the pons,medulla,or cerebellum.Arrhythmia is a recognized cause of dizziness in people with structural or ischemic heart disease.We report a case of exercise-induced transient ventricular tachycardia and dizziness in a man with no evidence of organic heart disease.CASE SUMMARY A 42-year-old man presented with a 6 mo history of transient exercise-induced dizziness and prodromal palpitations.The patient was otherwise asymptomatic.Physical examination,otoscopy,vestibular tests,cerebellar tests,laboratory investigations,and imaging investigations were all unremarkable.Twenty-four hour Holter monitoring revealed four episodes of transient ventricular tachycardia during exercise.The patient was started on metoprolol and subsequently underwent radiofrequency catheter ablation.The patient reported a full recovery and no dizziness during daily activities.These results were maintained at the 6 mo follow-up.CONCLUSION Ventricular tachycardia is an uncommon but potentially serious cause of dizziness.The outcome of this case illustrates the benefits of careful clinical examination and communication with specialized centers.High clinical suspicion of arrhythmia in a patient with dizziness merits consultation with a cardiologist and referral to a specialized center to ensure timely diagnosis and treatment.展开更多
致心律失常性右室心肌病(arrhythmogenic right ventricular cardiomyopathy,ARVC)是一种正常心肌被脂肪和(或)纤维组织替代的遗传性心肌病,病变主要局限于右心室,也会累及左心室,临床表现为心力衰竭、室性心动过速及猝死。目前对ARVC...致心律失常性右室心肌病(arrhythmogenic right ventricular cardiomyopathy,ARVC)是一种正常心肌被脂肪和(或)纤维组织替代的遗传性心肌病,病变主要局限于右心室,也会累及左心室,临床表现为心力衰竭、室性心动过速及猝死。目前对ARVC的治疗主要包括运动限制、抗心律失常药物、安装植入型心律转复除颤器(implantable cardioverter-defibrillator,ICD)和导管消融。本文主要综述ICD和导管消融在治疗ARVC及预防ARVC患者猝死方面的最新研究进展。展开更多
目的通过食道电生理检查(transesophageal atrial pacing,TEAP)与心内电生理(electrophysiology study of the heart,EPS)比较研究,探讨小儿室上性心动过速(supraventricular tachycardia,SVT)射频消融(radiofre-quency catheter ablati...目的通过食道电生理检查(transesophageal atrial pacing,TEAP)与心内电生理(electrophysiology study of the heart,EPS)比较研究,探讨小儿室上性心动过速(supraventricular tachycardia,SVT)射频消融(radiofre-quency catheter ablation,RFCA)术前TEAP对小儿SVT的发病机制、诊断价值及介入治疗适应证规范应用。方法对1998年8月-2007年1月经RFCA治疗的SVT34例患儿的TEAP及EPS资料进行对比分析。结果SVT34例,30例TEAP显示房室结折返性心动过速(atrioventricular nodal reentrant tachycardia,AVNRT)5例,房室折返性心动过速(atrioventricular reentrant tachycardia,AVRT)25例,与EPS的诊断符合率为96.7%(29/30例);EPS诊断AVRT30例,AVNRT4例。成功消融32例,手术未见明显并发症。结论TEAP与EPS检查结果符合率较高,可作为快速性心律失常的初步诊断及定位,为选择EPS及RFCA术指征重要辅助手段;RFCA根治小儿室上性心动过速疗效肯定,是小儿SVT安全可行的介入治疗方法。展开更多
文摘Electrophysiology study and radiofrequency catheter ablation (RFCA) were performed in 26 patients with refractory sustained ventricular tachycardia (VT). After induction of VT, 12-lead electrocardiogram (ECG) was recorded and QRS morphology and axis of induced VT were studied to identify the origin of VT. The precise site of VT origin were localized by pace mapping and activation mapping carefully. RF energy was delivered through a big-tip deflectable electrode catheter when the earliest site of endocardial activation and a high-frequency and low-amplitude potential of Purkinje fiber, preceding surface QRS by more than 25 ms, were identified and / or a pace map was obtained showing identical QRS complexes in at least 11 of 12 ECG leads. VTs were ablated successfully in 24 of 26 patients (success rate was 92%). For successful ablation, it is essential that the pace map QRS morphology in 12 leads should be identical with that in spontaneous or induced VT as far as possible in performing pace mapping. Pace mapping is safe, simple and has no unfavourable effect on hemodynamics although it takes longer time. Activation mapping takes shorter time and has a high success rate. QRS configuration in spontaneous VT can help to localize the site of VT origin. Deliberate mapping at the site suggested to bo the origin of VT by surface ECG can shorten the duration of mapping and increase the success rate of RFCA. RFCA of VT in patients without structural heart disease is effective, safe, and has a high success rate, so it may be considered as an early therapy for these patients.
文摘Background Radiofrequency catheter ablation （RFCA） has been established as an effective and curative therapy for ventricular tachycardia （VT） and severely symptomatic premature ventricular contraction （PVC） from the outflow tract in structurally normal hearts. This study aimed to investigate electrophysiologic characteristics and effects of RFCA for patients with idiopathic VT and symptomatic PVC originating from the valve annulus. Methods Characteristics of body surface electrocardiogram （ECG） and endocardiogram in a successful RFCA target were analyzed in 16 patients with idiopathic VT and symptomatic PVC originating from the valve annulus. Additionally, the ECG characteristics of VT or PVC were compared with those of manifest Wolff-Parkinson-White （WPW） syndrome originating from the same site of origin in 15 patients. Results Thirteen patients were successful, 2 recurrent and 1 failed. The recurrent cases underwent successful ablation the second time guided by the Ensite 3000 mapping system. In all patients with the WPW syndrome, the characteristics of QRS morphology were well matched with those of the VT and PVC that originated from corresponding sites of origin. Conclusions RFCA is an effective curative therapy for VT and There are specific characteristics in ECG and the ablation site accessory pathway＇s algorithm. symptomatic PVC originating from the valve annulus. could be located by means of the WPW syndrome
文摘In patients with structural heart disease, ventricular tachycardia (VT) worsens the clinical condition and may severely affect the shortand long-term prognosis. Several therapeutic options can be considered for the management of this arrhythmia. Among others, catheter ablation, a closed-chest therapy, can prevent arrhythmia recurrences by abolishing the arrhythmogenic substrate. Over the last two decades, different techniques have been developed for an effective approach to both tolerated and untolerated VTs. The clinical outcome of patients undergoing ablation has been evaluated in multiple studies. This editorial gives an overview of the role, methodology, clinical outcome and innovative approaches in catheter ablation of VT.
基金Supported by the National Natural Science Foundation of China,No.81873484,No.81170167,and No.81270002the Natural Science Foundation of Zhejiang Province,No.LZ16H020001.
文摘BACKGROUND With an increased number of surgical procedures involving the mitral annular region,the risk of mitral valve prolapse(MVP)has also increased.Previous studies have reported that worsening of MVP occurred early after radiofrequency catheter ablation(RFCA)at papillary muscles in ventricular tachycardia(VT)patients with preoperative MVP.CASE SUMMARY We report a case where MVP and papillary muscle rupture occurred 2 wk after RFCA in a papillary muscle originated VT patient without mitral valve regurgitation or prolapse before.The patient then underwent mitral valve replacement with no premature ventricular contraction or VT.During the surgery,a papillary muscle rupture was identified.Pathological examination showed necrosis of the papillary muscle.The patient recovered after mitral valve replacement.CONCLUSION Too many ablation procedures and energy should be avoided.
文摘Ventricular tachycardia(VT) is a crucial cause of sudden cardiac death(SCD) and a primary cause of mortality and morbidity in patients with structural cardiac disease. VT includes clinical disorders varying from benign to lifethreatening. Most life-threatening episodes are correlated with coronary artery disease, but the risk of SCD varies in certain populations, with various underlying heart conditions, specific family history, and genetic variants. The targets of VT management are symptom alleviation, improved quality of life, reduced implantable cardioverter defibrillator shocks, prevention of reduction of left ventricular function, reduced risk of SCD, and improved overall survival. Antiarrhythmic drug therapy and endocardial catheter ablation remains the cornerstone of guideline-endorsed VT treatment strategies in patients with structural cardiac abnormalities. Novel strategies such as epicardial ablation, surgical cryoablation, transcoronary alcohol ablation, pre-procedural imaging, and stereotactic ablative radiotherapy are an appealing area of res-earch. In this review, we gathered all recent advances in innovative therapies as well as experimental evidence focusing on different aspects of VT treatment that could be significant for future favorable clinical applications.
基金Supported by the Fujian Provincial Health Commission,No.2019-ZQN-78the National Natural Science Foundation of China,No.81503431the Natural Science Foundation of the Fujian Province,No.2020J01247.
文摘BACKGROUND Dizziness is a common symptom in adults and usually due to peripheral causes affecting semicircular canal function or central causes affecting the pons,medulla,or cerebellum.Arrhythmia is a recognized cause of dizziness in people with structural or ischemic heart disease.We report a case of exercise-induced transient ventricular tachycardia and dizziness in a man with no evidence of organic heart disease.CASE SUMMARY A 42-year-old man presented with a 6 mo history of transient exercise-induced dizziness and prodromal palpitations.The patient was otherwise asymptomatic.Physical examination,otoscopy,vestibular tests,cerebellar tests,laboratory investigations,and imaging investigations were all unremarkable.Twenty-four hour Holter monitoring revealed four episodes of transient ventricular tachycardia during exercise.The patient was started on metoprolol and subsequently underwent radiofrequency catheter ablation.The patient reported a full recovery and no dizziness during daily activities.These results were maintained at the 6 mo follow-up.CONCLUSION Ventricular tachycardia is an uncommon but potentially serious cause of dizziness.The outcome of this case illustrates the benefits of careful clinical examination and communication with specialized centers.High clinical suspicion of arrhythmia in a patient with dizziness merits consultation with a cardiologist and referral to a specialized center to ensure timely diagnosis and treatment.
文摘致心律失常性右室心肌病(arrhythmogenic right ventricular cardiomyopathy,ARVC)是一种正常心肌被脂肪和(或)纤维组织替代的遗传性心肌病,病变主要局限于右心室,也会累及左心室,临床表现为心力衰竭、室性心动过速及猝死。目前对ARVC的治疗主要包括运动限制、抗心律失常药物、安装植入型心律转复除颤器(implantable cardioverter-defibrillator,ICD)和导管消融。本文主要综述ICD和导管消融在治疗ARVC及预防ARVC患者猝死方面的最新研究进展。
文摘目的通过食道电生理检查(transesophageal atrial pacing,TEAP)与心内电生理(electrophysiology study of the heart,EPS)比较研究,探讨小儿室上性心动过速(supraventricular tachycardia,SVT)射频消融(radiofre-quency catheter ablation,RFCA)术前TEAP对小儿SVT的发病机制、诊断价值及介入治疗适应证规范应用。方法对1998年8月-2007年1月经RFCA治疗的SVT34例患儿的TEAP及EPS资料进行对比分析。结果SVT34例,30例TEAP显示房室结折返性心动过速(atrioventricular nodal reentrant tachycardia,AVNRT)5例,房室折返性心动过速(atrioventricular reentrant tachycardia,AVRT)25例,与EPS的诊断符合率为96.7%(29/30例);EPS诊断AVRT30例,AVNRT4例。成功消融32例,手术未见明显并发症。结论TEAP与EPS检查结果符合率较高,可作为快速性心律失常的初步诊断及定位,为选择EPS及RFCA术指征重要辅助手段;RFCA根治小儿室上性心动过速疗效肯定,是小儿SVT安全可行的介入治疗方法。
