Mode and Characteristics of Arrhythmia Initiation in Idiopathic Ventricular Fibrillation: A THESIS Substudy.
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Belhassen Bernard, Conte Giulio, Steinberg Christian, Whitaker John, Khan Habib R, Laredo Mikael, Doldi Florian, Ho Reginald, Tadros Rafik, Dinov Boris, Chorin Ehud, Hansom Simon, Waintraub Xavier, Eckardt Lars, Jankelson Lior, Peichl Petr, Mellor Greg, Sy Raymond W, Rattanawong Pattara, Stojkovic Stefan, Garber Leonid, Suna Gonca, Kautzner Josef, Chan Kim Hoe, Srivathsan Komandoor, Tedrow Usha, Havranek Stepan, Murgatroyd Francis, Shauer Ayelet, Winkel Bo Gregers, Page Stephen P, Milman Anat, Lador Adi, Ayou Romeo, Sellal Jean Marc, Chevalier Philippe, García-Fernández F Javier, Reichlin Tobias, Shah Dipen, Nazer Babak, Bermudez-Jimenez Francisco, Nagase Satoshi, Morita Hiroshi, Nam Gi-Byoung, Pappone Carlo, Lambiase Pier D, Strohmer Bernhard, Stuehlinger Markus, Gandjbakhch Estelle, Schulze-Bahr Eric, Krahn Andrew D, Tovia-Brodie Oholi, THESIS Investigators
Аннотация
OBJECTIVES: The aim of this study was to assess the mode and characteristics of initiation of polymorphic ventricular tachycardia (PVT) in patients with short or long-coupled PVT/IVF included in THESIS (THerapy Efficacy in Short or long-coupled idiopathic ventricular fibrillation: an International Survey), a multicenter study involving 287 IVF patients treated with drugs or radiofrequency ablation.
METHODS: We reviewed the initiation of 410 episodes of ≥1 PVT triplet in 180 patients (58.3% females; age 39.6 ± 13.6 years) with IVF. The incidence of pause-dependency arrhythmia initiation (prolongation by >20 ms of the preceding cycle length) was assessed.
RESULTS: Most arrhythmias (n = 295; 72%) occurred during baseline supraventricular rhythm without ambient premature ventricular complexes (PVCs), whereas 106 (25.9%) occurred during baseline rhythm including PVCs. Nine (2.2%) arrhythmias occurred during atrial/ventricular pacing and were excluded from further analysis. Mode of PVT initiation was pause-dependent in 45 (15.6%) and 64 (60.4%) of instances in the first and second settings, respectively, for a total of 109 of 401 (27.2%). More than one type of pause-dependent and/or non-pause-dependent initiation (mean: 2.6) occurred in 94.4% of patients with ≥4 events. Coupling intervals of initiating PVCs were <350 ms, 350-500 ms, and >500 ms in 76.6%, 20.72%, and 2.7% of arrhythmia initiations, respectively.
CONCLUSIONS: Pause-dependent initiation occurred in more than a quarter of arrhythmic episodes in IVF patients. PVCs having long (between 350 and 500 ms) and very long (>500 ms) coupling intervals were observed at the initiation of nearly a quarter of PVT episodes.