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Optimizing implantable cardioverter-defibrillator treatment of rapid ventricular tachycardia: antitachycardia pacing therapy during charging. 2007

Wolfgang Schoels, and David Steinhaus, and W Ben Johnson, and Gilles O'hara, and Joerg O Schwab, and Inge Jenniskens, and Paul J Degroot, and Feng Tang, and Erhard Helmling, and
Evangelisches und Johanniter Klinikum Niederrhein GmbH, Herzzentrum Duisburg, Klinik für Kardiologie und Angiologie, Duisburg, Germany.

BACKGROUND Previous studies in implantable cardioverter-defibrillator (ICD) patients demonstrated the efficacy and safety of antitachycardia pacing (ATP) for rapid ventricular tachycardias (VT). To prevent shock delay in case of ATP failure, a new feature (ATP during charging) was developed to deliver ATP for rapid VT while charging for shock. OBJECTIVE The purpose of this study was to determine the efficacy and safety of this new feature. METHODS In a prospective, nonrandomized trial, patients with standard ICD indication received an EnTrust ICD. VT and ventricular fibrillation (VF) episodes were reviewed for appropriate detection, ATP success, rhythm acceleration, and related symptoms. RESULTS In 421 implanted patients, 116 VF episodes occurred in 37 patients. Eighty-four (72%) episodes received ATP during or before charging. ATP prevented a shock in 58 (69%) of 84 episodes in 15 patients. ATP stopped significantly more monomorphic (77%) than polymorphic VTs (44%, P = .05). Five (6%) episodes accelerated after ATP but were terminated by the backup shock(s). No symptoms were related to ATP during charging. In four patients, 38 charges were saved by delivering ATP before charging. Of 98 induced VF episodes, 28% were successfully terminated by ATP versus 69% for spontaneous episodes (P <.01). CONCLUSIONS Most VTs detected in the VF zone can be painlessly terminated by ATP delivered during charging, with a low risk of acceleration or symptoms. ATP before charging allows delivery of two ATP attempts before shock in the same time that would otherwise be required to deliver only one ATP plus a shock. It also offers potential battery energy savings.

UI MeSH Term Description Entries
D008297 Male Males
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D002304 Cardiac Pacing, Artificial Regulation of the rate of contraction of the heart muscles by an artificial pacemaker. Pacing, Cardiac, Artificial,Artificial Cardiac Pacing,Artificial Cardiac Pacings,Cardiac Pacings, Artificial,Pacing, Artificial Cardiac,Pacings, Artificial Cardiac
D005260 Female Females
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328 Adult A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available. Adults
D000368 Aged A person 65 years of age or older. For a person older than 79 years, AGED, 80 AND OVER is available. Elderly
D000369 Aged, 80 and over Persons 80 years of age and older. Oldest Old
D017147 Defibrillators, Implantable Implantable devices which continuously monitor the electrical activity of the heart and automatically detect and terminate ventricular tachycardia (TACHYCARDIA, VENTRICULAR) and VENTRICULAR FIBRILLATION. They consist of an impulse generator, batteries, and electrodes. Cardioverter-Defibrillators, Implantable,Implantable Cardioverter Defibrillator,Implantable Cardioverter-Defibrillators,Implantable Defibrillators,Cardioverter Defibrillator, Implantable,Cardioverter Defibrillators, Implantable,Cardioverter-Defibrillator, Implantable,Defibrillator, Implantable,Defibrillator, Implantable Cardioverter,Defibrillators, Implantable Cardioverter,Implantable Cardioverter Defibrillators,Implantable Cardioverter-Defibrillator,Implantable Defibrillator
D017180 Tachycardia, Ventricular An abnormally rapid ventricular rhythm usually in excess of 150 beats per minute. It is generated within the ventricle below the BUNDLE OF HIS, either as autonomic impulse formation or reentrant impulse conduction. Depending on the etiology, onset of ventricular tachycardia can be paroxysmal (sudden) or nonparoxysmal, its wide QRS complexes can be uniform or polymorphic, and the ventricular beating may be independent of the atrial beating (AV dissociation). Idiopathic Ventricular Tachycardia,Nonsustained Ventricular Tachycardia,Paroxysmal Supraventricular Tachycardia,Ventricular Tachyarrhythmias,Ventricular Tachycardia,Idiopathic Ventricular Tachycardias,Nonsustained Ventricular Tachycardias,Paroxysmal Supraventricular Tachycardias,Supraventricular Tachycardia, Paroxysmal,Tachyarrhythmia, Ventricular,Tachycardia, Idiopathic Ventricular,Tachycardia, Nonsustained Ventricular,Tachycardia, Paroxysmal Supraventricular,Ventricular Tachyarrhythmia,Ventricular Tachycardia, Idiopathic,Ventricular Tachycardia, Nonsustained,Ventricular Tachycardias

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