Journal of interventional cardiac electrophysiology : an international journal of arrhythmias and pacing, Jan 23, 2015
Cardiac resynchronization therapy (CRT) improves outcomes in patients with heart failure, yet res... more Cardiac resynchronization therapy (CRT) improves outcomes in patients with heart failure, yet response rates are variable. We sought to determine whether physician-specified CRT programming was associated with improved outcomes. Using data from the ALTITUDE remote follow-up cohort, we examined sensed atrioventricular (AV) and ventricular-to-ventricular (VV) programming and their associated outcomes in patients with de novo CRT from 2009-2010. Outcomes included arrhythmia burden, left ventricular (LV) pacing, and all-cause mortality at 4 years. We identified 5709 patients with de novo CRT devices; at the time of implant, 34 % (n = 1959) had entirely nominal settings programmed, 40 % (n = 2294) had only AV timing adjusted, 11 % (n = 604) had only VV timing adjusted, and 15 % (n = 852) had both AV and VV adjusted from nominal programming. Suboptimal LV pacing (<95 %) during follow-up was similar across groups; however, the proportion with atrial fibrillation (AF) burden >5 % was ...
Most patients with atrial fibrillation (AF) require rate control; however, the optimal target hea... more Most patients with atrial fibrillation (AF) require rate control; however, the optimal target heart rate remains under debate. We aimed to assess rate control and subsequent outcomes among patients with permanent AF. We studied 2812 US outpatients with permanent AF in the Outcomes Registry for Better Informed Treatment of Atrial Fibrillation. Resting heart rate was measured longitudinally and used as a time-dependent covariate in multivariable Cox models of all-cause and cause-specific mortality during a median follow-up of 24 months. At baseline, 7.4% (n=207) had resting heart rate <60 beats per minute (bpm), 62% (n=1755) 60 to 79 bpm, 29% (n=817) 80 to 109 bpm, and 1.2% (n=33) ≥110 bpm. Groups did not differ by age, previous cerebrovascular disease, heart failure status, CHA2DS2-VASc scores, renal function, or left ventricular function. There were significant differences in race (P=0.001), sinus node dysfunction (P=0.004), and treatment with calcium-channel blockers (P=0.006) a...
The characteristics of patients undergoing atrial fibrillation (AF) ablation and subsequent outco... more The characteristics of patients undergoing atrial fibrillation (AF) ablation and subsequent outcomes in community practice are not well described. Using the Outcomes Registry for Better Informed Treatment of Atrial Fibrillation (ORBIT-AF), we investigated the prevalence and impact of catheter ablation of AF. Among 9935 patients enrolled, 5.3% had previous AF ablation. Patients with AF ablation were significantly younger, more frequently male, and had less anemia, chronic obstructive pulmonary disease, and previous myocardial infarction (P<0.05 for all analyses) than those without previous catheter ablation of AF. Ablated patients were more likely to have a family history of AF, obstructive sleep apnea, paroxysmal AF, and moderate-to-severe symptoms (P<0.0001 for all analyses). Patients with previous ablation were more often in sinus rhythm on entry into the registry (52% vs. 32%; P<0.0001). Despite previous ablation, 46% in the ablation group were still on antiarrhythmic th...
IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010), 1999
Method of moments (MoM) matrices may contain redundant information, resulting from the dense samp... more Method of moments (MoM) matrices may contain redundant information, resulting from the dense sampling rates of fields. Therefore, one would like to reduce the amount of data contained in the matrices by effectively slowing down the sampling rates to a level compatible with the physics of the problem, such that sparse rather than dense matrices are produced. The REFT method
Semigroups and Formal Languages - In honour of the 65th birthday of Donald B. McAlister - Proceedings of the International Conference, 2007
ABSTRACT The paper shows that each pseudovariety of Abelian groups with decidable membership is e... more ABSTRACT The paper shows that each pseudovariety of Abelian groups with decidable membership is even completely hyperdecidable. This sharpens some earlier results of the first and the third author. The proof is based on an auxiliary result (Lemma 2.1) which proves that it is decidable whether a system of linear equations of a certain kind admits a solution within some given semilinear subset of ℤ t . It is also proved that no proper non locally finite pseudovariety of Abelian groups is weakly κ-reducible. There is an error in the proof of the latter result which can, however, be easily fixed. Since H is non proper but otherwise arbitrary non locally finite one cannot assume the existence of a prime p such that ℤ/pℤ∉H. Instead one may choose a prime p and a positive integer n such that ℤ/p n ℤ∉H while ℤ/p n-1 ℤ∈H. One then should choose (ab p n ) * and b p n-1 as labels of e and v 2 , respectively, and modify the remaining part of the proof accordingly.
Journal of interventional cardiac electrophysiology : an international journal of arrhythmias and pacing, Jan 23, 2015
Cardiac resynchronization therapy (CRT) improves outcomes in patients with heart failure, yet res... more Cardiac resynchronization therapy (CRT) improves outcomes in patients with heart failure, yet response rates are variable. We sought to determine whether physician-specified CRT programming was associated with improved outcomes. Using data from the ALTITUDE remote follow-up cohort, we examined sensed atrioventricular (AV) and ventricular-to-ventricular (VV) programming and their associated outcomes in patients with de novo CRT from 2009-2010. Outcomes included arrhythmia burden, left ventricular (LV) pacing, and all-cause mortality at 4 years. We identified 5709 patients with de novo CRT devices; at the time of implant, 34 % (n = 1959) had entirely nominal settings programmed, 40 % (n = 2294) had only AV timing adjusted, 11 % (n = 604) had only VV timing adjusted, and 15 % (n = 852) had both AV and VV adjusted from nominal programming. Suboptimal LV pacing (<95 %) during follow-up was similar across groups; however, the proportion with atrial fibrillation (AF) burden >5 % was ...
Most patients with atrial fibrillation (AF) require rate control; however, the optimal target hea... more Most patients with atrial fibrillation (AF) require rate control; however, the optimal target heart rate remains under debate. We aimed to assess rate control and subsequent outcomes among patients with permanent AF. We studied 2812 US outpatients with permanent AF in the Outcomes Registry for Better Informed Treatment of Atrial Fibrillation. Resting heart rate was measured longitudinally and used as a time-dependent covariate in multivariable Cox models of all-cause and cause-specific mortality during a median follow-up of 24 months. At baseline, 7.4% (n=207) had resting heart rate <60 beats per minute (bpm), 62% (n=1755) 60 to 79 bpm, 29% (n=817) 80 to 109 bpm, and 1.2% (n=33) ≥110 bpm. Groups did not differ by age, previous cerebrovascular disease, heart failure status, CHA2DS2-VASc scores, renal function, or left ventricular function. There were significant differences in race (P=0.001), sinus node dysfunction (P=0.004), and treatment with calcium-channel blockers (P=0.006) a...
The characteristics of patients undergoing atrial fibrillation (AF) ablation and subsequent outco... more The characteristics of patients undergoing atrial fibrillation (AF) ablation and subsequent outcomes in community practice are not well described. Using the Outcomes Registry for Better Informed Treatment of Atrial Fibrillation (ORBIT-AF), we investigated the prevalence and impact of catheter ablation of AF. Among 9935 patients enrolled, 5.3% had previous AF ablation. Patients with AF ablation were significantly younger, more frequently male, and had less anemia, chronic obstructive pulmonary disease, and previous myocardial infarction (P<0.05 for all analyses) than those without previous catheter ablation of AF. Ablated patients were more likely to have a family history of AF, obstructive sleep apnea, paroxysmal AF, and moderate-to-severe symptoms (P<0.0001 for all analyses). Patients with previous ablation were more often in sinus rhythm on entry into the registry (52% vs. 32%; P<0.0001). Despite previous ablation, 46% in the ablation group were still on antiarrhythmic th...
IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010), 1999
Method of moments (MoM) matrices may contain redundant information, resulting from the dense samp... more Method of moments (MoM) matrices may contain redundant information, resulting from the dense sampling rates of fields. Therefore, one would like to reduce the amount of data contained in the matrices by effectively slowing down the sampling rates to a level compatible with the physics of the problem, such that sparse rather than dense matrices are produced. The REFT method
Semigroups and Formal Languages - In honour of the 65th birthday of Donald B. McAlister - Proceedings of the International Conference, 2007
ABSTRACT The paper shows that each pseudovariety of Abelian groups with decidable membership is e... more ABSTRACT The paper shows that each pseudovariety of Abelian groups with decidable membership is even completely hyperdecidable. This sharpens some earlier results of the first and the third author. The proof is based on an auxiliary result (Lemma 2.1) which proves that it is decidable whether a system of linear equations of a certain kind admits a solution within some given semilinear subset of ℤ t . It is also proved that no proper non locally finite pseudovariety of Abelian groups is weakly κ-reducible. There is an error in the proof of the latter result which can, however, be easily fixed. Since H is non proper but otherwise arbitrary non locally finite one cannot assume the existence of a prime p such that ℤ/pℤ∉H. Instead one may choose a prime p and a positive integer n such that ℤ/p n ℤ∉H while ℤ/p n-1 ℤ∈H. One then should choose (ab p n ) * and b p n-1 as labels of e and v 2 , respectively, and modify the remaining part of the proof accordingly.
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Papers by Benjamin Steinberg