American heart journal
-
American heart journal · Sep 2006
Comparative StudyASymptomatic atrial fibrillation and Stroke Evaluation in pacemaker patients and the atrial fibrillation Reduction atrial pacing Trial (ASSERT).
Asymptomatic atrial fibrillation (AF) is common and may have the same prognostic implications as symptomatic AF. Among patients receiving dual-chamber pacemakers, it is now possible to quantify asymptomatic AF accurately. Most of these episodes are of short duration, often lasting only seconds to minutes and are called atrial high-rate episodes (AHRE) to distinguish them from the longer episodes of overt AF. ⋯ The second hypothesis to be tested is that overdrive atrial pacing will reduce the risk of symptomatic AF in pacemaker patients without a previous history of AF. Finally, a 400-patient substudy will use the noninvasive testing capabilities of the patients' pacemaker to evaluate changes in atrial electrophysiology over 2 years. This substudy will determine if atrial electrical remodeling is detectable in pacemaker patients and if it is associated with the development of AF.
-
American heart journal · Sep 2006
Comparative StudyTemporal trends and drug exposures in pulmonary hypertension: an American experience.
Reports have linked anorexigen intake to an increased risk of pulmonary arterial hypertension (PAH). With the rise in anorexigen use in the latter half of the last decade, we established a surveillance network within the United States to monitor temporal trends in the number of reported cases of PAH. We also studied whether use of anorexigens and other drugs differed among patients with pulmonary hypertension of different etiologies. ⋯ No epidemic of anorexigen-related PAH was evident during the study period. As persons who had taken fenfluramine or dexfenfluramine were particularly likely to be referred for evaluation of pulmonary hypertension, it is unlikely that the failure to detect an anorexigen-induced rise in primary pulmonary hypertension was because of underascertainment. The association between fenfluramine derivatives and PAH is consistent with the risk elevations previously reported.