ABSTRACT
INTRODUCTION: Catheter ablation is an important treatment option for sustained ventricular arrhythmias (VA) that are refractory to pharmacological treatment; however, patients with fast VA or electrical storm (ES) are at risk for cardiogenic shock. We report our experience using cardiopulmonary support with extracorporeal membrane oxygenation (ECMO) during catheter ablation of VA. METHODS: Nineteen patients (mean age, 62 ± 10 years; 84% male) were referred to our center for CA of ES between January 2017 and April 2018. ES was defined as the occurrence of ≥3 ventricular tachycardia or ventricular fibrillation episodes requiring electrical cardioversion or defibrillation in a 24-hour period. ECMO support was implemented for all patients. RESULTS: CA of ES was completed in all patients. Activation mapping was performed for all VTs and substrate modification was performed by targeting sites identified by late/fragmented abnormal potentials. VTs were not inducible after ablation in 16 of 19 patients (84%). With regard to procedural complications, two patients underwent percutaneous angioplasty with stenting for a femoral artery dissection and one patient was treated for a dislodged ECMO arterial cannula and subsequent hemorrhagic shock. After a median follow-up of 10 months, three patients died from refractory heart failure and one patient died as a result of ES. Overall, the procedural success rate was 68% and the Kaplan-Meier mortality rate was 21%. CONCLUSIONS: ECMO support may be used for ablation procedures in patients with ES.
Subject(s)
Catheter Ablation , Extracorporeal Membrane Oxygenation , Heart Rate , Heart Ventricles/surgery , Tachycardia, Ventricular/surgery , Ventricular Fibrillation/surgery , Action Potentials , Adult , Aged , Catheter Ablation/adverse effects , Catheter Ablation/mortality , Electrophysiologic Techniques, Cardiac , Extracorporeal Membrane Oxygenation/adverse effects , Extracorporeal Membrane Oxygenation/mortality , Female , Heart Ventricles/physiopathology , Humans , Male , Middle Aged , Tachycardia, Ventricular/diagnosis , Tachycardia, Ventricular/mortality , Tachycardia, Ventricular/physiopathology , Time Factors , Treatment Outcome , Ventricular Fibrillation/diagnosis , Ventricular Fibrillation/mortality , Ventricular Fibrillation/physiopathologyABSTRACT
In this case report, we describe a complex case of a 67-year-old patient who was suffering from acute heart failure with electrical storm. Clinical case management was based on an integrated approach comprising two different procedures that were complementary and synergistic, and that allowed the patient to reach acute stabilization and to demonstrate mid-term clinical improvement. Complex clinical settings, such as electrical and hemodynamic instability, require complex solutions. The use of an integrated approach that allows physiopathological mechanisms to work together may be beneficial for these patients.
ABSTRACT
Background: Catheter ablation is a treatment option for sustained ventricular tachycardias (VTs) that are refractory to pharmacological treatment; however, patients with fast VT and electrical storm (ES) are at risk for cardiogenic shock. We report our experience using cardiopulmonary support with extracorporeal membrane oxygenation (ECMO) during catheter ablation of VT. Methods: Sixty-two patients (mean age 68 ± 9 years; 94% male) were referred to our center for catheter ablation of repeated episodes of hemodynamically unstable ventricular arrhythmias. ES was defined as the occurrence of three or more VT/ventricular fibrillation episodes requiring electrical cardioversion or defibrillation in a 24-h period. All patients had hemodynamically unstable VTs. Results: Thirty-one patients (group 1) performed catheter ablation without ECMO support and 31 patients (group 2) with ECMO support. At the end of the procedure, ventricular inducibility was not performed in 16 patients of group 1 (52%) due to significant hemodynamic instability. Ventricular inducibility was performed in the other 15 patients (48%); polymorphic VTs were inducible in eight patients. In group 2, VTs were not inducible in 29 patients (93%); polymorphic VTs were inducible in two patients. The median follow-up duration was 24 months. Four patients of group 1 (13%) and five patients of group 2 (16%) died due to refractory heart failure. An implantable cardioverter-defibrillator intervention (shock or antitachycardia pacing) was documented in 13 patients of group 1 (42%) and six patients of group 2 (19%). Conclusions: Extracorporeal membrane oxygenation support during catheter ablation for hemodynamically unstable VTs is a useful tool to prevent acute procedural heart failure and to reduce arrhythmic burden.