Journal of cardiovascular electrophysiology
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J. Cardiovasc. Electrophysiol. · Aug 2003
Clinical TrialCircadian profile of cardiac autonomic nervous modulation in healthy subjects: differing effects of aging and gender on heart rate variability.
Circadian Profile of Heart Rate Variability. ⋯ Normal aging is associated with a constant decline of cardiac vagal modulation due to a significant decrease of nocturnal parasympathetic activity. The significant gender-related difference of HRV decreases with aging. These findings emphasize the need to determine age-, gender-, and nycthemeral-dependent normal ranges for HRV assessment.
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J. Cardiovasc. Electrophysiol. · Aug 2003
Randomized Controlled Trial Clinical TrialBiphasic versus monophasic cardioversion in shock-resistant atrial fibrillation:.
Biphasic versus Monophasic Cardioversion. ⋯ An ascending sequence of 150-, 200-, and 360-J transthoracic biphasic cardioversion shocks are successful more often than a single 360-J monophasic shock. Thus, biphasic shocks should be the recommended configuration of choice for all cardioversions.
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J. Cardiovasc. Electrophysiol. · Apr 2003
Comparative StudyImplantable cardioverter defibrillator in high-risk long QT syndrome patients.
Implantable cardioverter defibrillators (ICDs) are increasingly being used in high-risk long QT syndrome (LQTS) patients, but there are limited data regarding clinical experience with this therapeutic modality. The aim of this study is to describe the clinical characteristics of 125 LQTS patients treated with ICDs compared with LQTS patients having similar risk indications who were not treated with ICDs. Among 125 LQTS patients with ICDs, there were 54 cardiac arrest survivors, 19 patients who had ICDs implanted due to recurrent syncope despite beta-blocker therapy, and 52 patients with ICDs implanted due to other reasons, including syncope and LQTS-related sudden death in a close family member. Patients with cardiac arrest and those with recurrent syncope despite beta-blocker therapy (n = 73) were compared to 161 LQTS patients who had similar indications (89 cardiac arrest and 72 recurrent syncope despite beta-blocker therapy) but did not receive ICDs. Total mortality was the endpoint of the analysis. There was 1 (1.3%) death in 73 ICD patients followed an average of 3 years, whereas there were 26 deaths (16%) in non-ICD patients during mean 8-year follow-up (P = 0.07 from log rank test from Kaplan-Meier curves). ⋯ ICDs provide an important therapeutic option to prevent sudden arrhythmic death in high-risk LQTS patients. A long-term prospective study is needed to determine the benefit of this therapeutic modality in LQTS patients.
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J. Cardiovasc. Electrophysiol. · Apr 2003
Case ReportsTotal pulmonary vein occlusion as a consequence of catheter ablation for atrial fibrillation mimicking primary lung disease.
Catheter ablation has recently been used for curative treatment of atrial fibrillation. ⋯ PV stenosis/occlusion after catheter ablation of atrial fibrillation occurs in a subset of patients. However, because in-stent restenosis occurred in two patients after 6 to 10 weeks, final interventional strategy for PV stenosis or occlusion remains unclear. To prevent future PV stenosis or occlusion, a decrease in target temperature and energy of radiofrequency current or the use of new energy sources (ultrasound, cryothermia, microwave) seems necessary.