Key result
Continuous atrial arrhythmia detection with a dual chamber ICD revealed a 65% incidence of atrial tachyarrhythmias (26 of 40 patients), with most episodes lasting <1 hour.
Observational (n=40)
Continuous atrial arrhythmia detection with a dual chamber ICD reveals a high incidence of short-duration paroxysmal atrial tachyarrhythmias in patients with ventricular tachyarrhythmias.
Short atrial tachyarrhythmias may be common in dual-chamber ICD recipients; leaves open their prognostic impact and management implications.
Atrial tachyarrhythmias play an important role in the treatment of patients with malignant ventricular tachyarrhythmias not only with respect to inappropriate discharges but also to left ventricular function and stroke risk. A combined dual chamber defibrillator provides separate therapies for atrial and ventricular tachyarrhythmias. To assess the incidence of atrial tachyarrhythmias in patients with this dual chamber implantable defibrillator, 40 patients with ventricular tachyarrhythmias and concomitant atrial tachyarrhythmias and/or AV conduction disturbances were included in a prospective study. During a mean follow-up of 25 +/- 11 months, 26 of 40 patients had a total of 1,430 recurrences of atrial tachyarrhythmias. The vast majority of the atrial tachyarrhythmias with regular atrial cycles had a mean median atrial cycle length of 235 +/- 37 ms and a mean duration of 34 +/- 144 minutes. Atrial tachyarrhythmias with irregular atrial cycles exhibited a median atrial cycle length of 198 +/- 31 ms and had a mean duration of 246 +/- 1,264 minutes. In addition, 67% of 375 tachyarrhythmias, in which the median ventricular cycle length during the ongoing episode could be documented, had a ventricular rate <100 beats/min. Continuous atrial arrhythmia detection with a dual chamber ICD reveals a high incidence of atrial tachyarrhythmias with a predominantly short duration of paroxysmal recurrences <1 hour in the vast majority of episodes.
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Wolpert et al. (2003) conducted an observational in Ventricular tachyarrhythmias and concomitant atrial tachyarrhythmias and/or AV conduction disturbances (n=40). Dual chamber implantable defibrillator was evaluated on Incidence of atrial tachyarrhythmias. Continuous atrial arrhythmia detection with a dual chamber ICD revealed a 65% incidence of atrial tachyarrhythmias (26 of 40 patients), with most episodes lasting <1 hour.
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