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Resumen Introducción y objetivos: La tormenta eléctrica (TE) se caracteriza por episodios repetidos de taquicardia ventricular o fibrilación ventricular relacionados con mal pronóstico a corto y largo plazos. El objetivo fue evaluar la prevalencia, resultados y supervivencia de los pacientes sometidos a tratamiento intervencionista por TE en un centro de referencia. Métodos: Estudio unicéntrico, observacional y retrospectivo. Se revisaron los procedimientos de ablación por TE y se evaluaron las características basales de los pacientes, tipo de procedimiento, mortalidad total, recurrencia de arritmia, mortalidad cardiovascular y necesidad de trasplante. Resultados: Desde enero de 2009 hasta diciembre de 2016 se realizaron 67 procedimientos (38% de complejos: 19% de ablación endoepicárdica, 7.5% de crioablación epicárdica quirúrgica, 3% de simpatectomía, 3% de inyección coronaria con alcohol; 6% de apoyo con oxigenación con membrana extracorpórea) en 41 pacientes (61% de causa isquémica) por TE. La mortalidad intraprocedimiento fue del 1.5%. La mediana de seguimiento fue de 23.5 meses (RIQ, 14.2-52.7). Tras el primer ingreso por TE (uno o varios procedimientos), la mortalidad a un año fue de 9.8%. La incidencia acumulada de trasplante cardiaco por TE fue de 2.4%. En el análisis multivariado, el riesgo de recurrencias arrítmicas o muerte por cualquier causa fue significativamente mayor en pacientes con arritmias clínicas inducibles (HR, 9.03; p = 0.017). Conclusiones: El tratamiento de pacientes con TE, instituido en un centro de referencia y con experiencia, se relacionó con una tasa baja de recurrencia y supervivencia elevada, con una tasa de trasplante cardiaco por TE muy baja. Ante una recurrencia temprana es recomendable practicar un nuevo procedimiento durante el ingreso.
Abstract Introduction and objective: Electrical storm (ES) is characterized by repeated episodes of ventricular tachycardia or ventricular fibrillation, with poor short and long term prognosis. Our objective was to evaluate the prevalence, results of interventional treatment and survival of patients undergoing interventional treatment for ES in our center. Methods: Retrospective, unicentric and observational study. ES ablation procedures were revised and data regarding baseline characteristics of the patients, type of procedure, total mortality, recurrence of arrhythmia, cardiovascular mortality and the need for transplantation were evaluated. Results: From January 2009 to December 2016, 67 procedures (38% complex procedures: 19% epicardial ablation, 7.5% surgical epicardial crioablation, 3% simpatectomy, 3% coronary alcohol injection, 6% extracorporeal membrane oxygenation support) were performed in 41 patients (61% Ischemic etiology) due to ES. Intraprocedural mortality was 1.5%. The median follow-up was 23.5 months (IQR [14.2-52.7]). After the first admission for ES (one or several procedures), 1-year mortality was 9.8%. The cumulative incidence of cardiac transplantation was 2.4%. The risk of arrhythmic recurrences or death was significantly higher in patients with inducible clinical arrhythmias after ablation (HR: 9.03, p = 0.017). Conclusions: The treatment of patients with ES, performed in a reference center, allows obtaining good rates of recurrence and survival, with very low rates of cardiac transplantation for ES. In the presence of an early recurrence, it is advisable to perform a new procedure during admission.
Subject(s)
Humans , Male , Female , Adult , Middle Aged , Aged , Ventricular Fibrillation/surgery , Tachycardia, Ventricular/surgery , Catheter Ablation/methods , Prognosis , Recurrence , Ventricular Fibrillation/physiopathology , Ventricular Fibrillation/mortality , Survival Rate , Retrospective Studies , Follow-Up Studies , Heart Transplantation/statistics & numerical data , Tachycardia, Ventricular/mortality , MexicoABSTRACT
Background Brugada syndrome (BrS) is known to cause malignant ventricular arrhythmia (VA) and sudden cardiac death (SCD). Patients with implantable cardioverter defibrillator (ICD) may experience recurrent shocks from ICD. Recent reports indicate that radiofrequency ablation (RFA) in BrS is feasible, and effective. Catheter ablation of premature ventricular complexes (PVCs) triggering VA and substrate modification of right ventricular outflow tract (RVOT) has been described. Methods and results Five patients (4 males, age-23 to 32 years) with BrS and electrical storm (ES) despite being on isoprenaline infusion and cilostazol (phosphodiestrase-3 inhibitor) underwent 3 dimensional electroanatomic mapping and RFA. Ventricular fibrillation was easily inducible in two patients. Voltage map of right ventricle was created in sinus rhythm in all patients. Substrate modification of RVOT was performed endocardially in one patient, both endocardial and epicardial in three and only epicardially in one patient. Brugada pattern gradually resolved over one week in all patients post procedure. These patients completed follow up of median 40 months (1.5–70). One patient had inappropriate shock due to atrial fibrillation, one had an episode of VF and appropriate shock 24 months after the RFA. The remaining four patients had no device therapy or VA in device log on follow up. Conclusion Abnormal myocardial substrate is observed in RVOT among patients with BrS. Substrate modification in these patients may abolish Brugada pattern on the ECG and prevents spontaneous VAs on long term follow up.
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Objective This is a case series of consecutive patients with past myocardial infarction presenting with Electrical Storm (ES) of unstable ventricular tachycardia (VT) treated by a protocol directed algorithm. Methods Management protocol involved treatment of reversible causes, ventilatory & hemodynamic support, administration of antiarrhythmic drugs (AAD) & maximally tolerated doses of beta-blockers, stellate ganglionectomy and Radiofrequency ablation (RFA) guided by Electro Anatomic Mapping (EAM). Patients were followed up periodically with review of device data logs. Results There were 12 patients (mean age = 61.38 ± 6.48 years & mean LVEF = 31.92 ± 4.23%). Presentation was recurrent ICD shocks (n = 5) or VT (n = 7). All were mechanically ventilated. Reversible causes were identified in 4 patients and appropriately addressed. Totally 8 patients underwent endocardial substrate modification by EAM & RFA. Endocardial LV Voltage mapping demonstrated a mean scar area of 70.04 ± 17.63 sq.cm (27.04 ± 6.20% of mapped area). The electrograms targeted for ablation included late potentials, fractionated electrograms, double potentials and channels within the scar. Two patients had stellate ganglionectomy in addition. Ten patients (83.3%) survived to discharge, all of whom are alive at a follow up of 30.12 ± 19 months free of ES. VT free survival at end of follow up was 80%. No patient had hospitalization related to VT. Single episode of VT recurrence was seen in 2 patients at 7 months and 1 year of follow up respectively. Conclusion In post myocardial infarction patients presenting with ES and unstable VT, a protocol driven approach involving substrate modification targeting abnormal electrograms improves outcomes.
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Objective Summarize the experiences of treating after-operation ventricular electrical storm (VES) with extra-corporeal membrane oxygenation (ECMO) .Methods Examine the clinical data of seven cases of treating after-operation VES with ECMO from January 2013 to April 2014 and analyze the basic pre-operation conditions of the patients ,diagnoses ,causes of VES ,ai-ding processes with ECMO ,and prognoses .Results Seven patients all were successfully separated from the machine after the treat -ment ,one patient infected seriously after being separated from the machine ,having multiple organ failure one week later and dis-charged voluntarily ;one patient having cerebral hemorrhage two days later after being separated from the machine and discharged voluntarily ;the remaining five patients cured and discharged with no complications .Conclusion ECMO can provide effective circu-lar support to patients suffering VES after heart operation ,maintaining coronary blood supply ,avoiding further myocardial damage , stabilizing electrolytes and the internal environment ,and gain time for restoration of heart rhythm and treatment according to the causes and triggers .
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Background: Catheter ablation (CA) has been shown to be effective in patients with recurrent ventricular tachycardia (VT); how-ever, its role in patients with electrical storm (ES) has not been studied in randomized trials. Objective: The aim of this study was to analyze ES cases treated with CA. Methods: This was a retrospective analysis of patients treated with CA for ES due to sustained monomorphic VT (SMVT). Procedure success was defined as lack of inducible VT at the end of ablation, partial success as the induction of non-clinical VT and failure as inducible clinical V T. Results:Sixteen procedures were performed in 14 patients: 10 successful, 3 partially successful and 3 failures. All patients were free from ventricular arrhythmia immediately after ablation. Ten patients (71.4%) were free from VT and 86.7% free from ES [8 (3-30)-month follow-up]. Five patients (35.7%) died from causes unrelated to arrhythmia. Conclusions: Catheter ablation is associated with acute suppression of VT in all patients with ES due to SMVT and with a recurrence-free outcome in most of them.
Introducción: La ablación por catéter (AC) ha demostrado que es beneficiosa en pacientes con taquicardia ventricular (TV) recurrente, pero su rol en pacientes con tormenta eléctrica (TE) no se ha estudiado en ensayos aleatorizados. Objetivo: Analizar los casos de TE tratados con AC. Material y métodos: Análisis retrospectivo de pacientes con TE debida a TV monomorfa sostenida (TVMS) tratados mediante AC. Se definió éxito del procedimiento a la ausencia de TV inducible al final de la ablación, éxito parcial a la inducción de TV no clínica y no éxito a la inducibilidad de la TV clínica. Resultados:Se realizaron 16 procedimientos en 14 pacientes: 10 exitosos, 3 éxito parcial y 3 no exitosos. Todos los pacientes evolucionaron sin arritmia ventricular inmediatamente posablación. Diez pacientes (71,4%) evolucionaron sin TV y el 86,7% sin TE [seguimiento 8 (3-30) meses]. Cinco pacientes (35,7%) murieron de causa no arrítmica. Conclusiones: La AC se asocia con una supresión aguda de la TV en todos los pacientes con TE debida a TVMS y con una evolución sin recurrencia en la mayoría de ellos.
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Background: The management of ventricular electrical storm can prove to be a challenge for the clinician given its complexity and life threatening consequences. Case characteristics: 8-year-old boy with repeated life-threatening polymorphic ventricular tachycardia following aortic valve replacement surgery. Intervention: Defibrillated 45 times in addition to multiple antiarrhythmic drugs. Outcome: Conversion to stable sinus rhythm with normal neurological outcome. Message: Electric storm can be controlled by combination of multiple intravenous antiarrhythmic drugs.
ABSTRACT
Medically refractory ventricular tachycardia (VT) storm can be controlled with radiofrequency catheter ablation (RFCA), however, it may be difficult to control in some patients with hemodynamic overload. We experienced a patient with intractable VT storm controlled by hemodynamic unloading. The patient had mid-septal hypertrophic cardiomyopathy with an implantable cardioverter defibrillator (ICD) back-up. Because of the severe mid-septal hypertrophy, his left ventricle (LV) had an hourglass-like morphology and showed apical ballooning; the focus of VT was at the border of apical ballooning. Although we performed VT ablation because of electrical storm with multiple ICD shocks, VT recurred 1 hour after procedure. As the post-RFCA monomorphic VT was refractory to anti-tachycardia pacing or ICD shock, we reduced the hemodynamic overload of LV with beta-blockade, hydration, and sedation. VT spontaneously stopped 1.5 hours later and the patient has remained free of VT for 24 months with beta-blockade alone. In patients with VT storm refractory to antiarrhythmic drugs or RFCA, the mechanism of mechano-electrical feedback should be considered and hemodynamic unloading may be an essential component of treatment.
Subject(s)
Humans , Male , Middle Aged , Cardiomyopathy, Hypertrophic/complications , Catheter Ablation , Electrocardiography , Gated Blood-Pool Imaging , Cardiac Catheterization , Tachycardia, Ventricular/diagnosis , Takotsubo Cardiomyopathy/complicationsABSTRACT
El servicio de arritmias y estimulación eléctrica programada del corazón es centro nacional de referencia de los pacientes con cardiopatía estructural o sin ella y arritmias ventriculares malignas, para precisar diagnósticos y tomar las medidas terapéuticas adecuadas, principalmente la implantación del cardioversor-desfibrilador automático. Desde hace 24 años se implantan estos dispositivos y se observó lo frecuente de sus complicaciones (con inclusión de la tormenta eléctrica), en coincidencia con la literatura. Se elaboró una serie propia, cuyos datos se han publicado y presentado. Ahora se intenta una panorámica del problema. El dispositivo salva la vida y tiene indicaciones precisas, se requiere una adecuada primera decisión porque de lo contrario resultan mayores los riesgos que los beneficios. No debe dejar de implantarse en quien sea necesario, pero tampoco se debe colocar sin una indicación precisa, en alguien que no va a utilizarlo pero sí a enfrentarse con todos sus problemas de por vida pues una vez implantado nadie ya se atreverá a retirarlo
The service of heart programmed electric stimulation and arrhythmias is national center of reference of patients with or without structural heart disease and malignant ventricular arrhythmias to specify exactly the diagnoses and to take the appropriate therapeutical measures, mainly the implantation of the implantable cardioverter-defibrillator. From 24 years ago these devices are implanted observing the frequent of its complications (included the electrical storm), coinciding with literature. An own series was designed whose data have been published and presented. Now, a panorama of the problem is tried. The device save the life and has precise indications, requiring an appropriate first decision because otherwise the risks are greater than the benefits. This device must to be implanted in who is necessary, but neither must to be placed without a precise indication, in someone who not goes used it but yes to face with all the problems thoroughout the life since once implanted nobody will be bold enough for to remove it