Robert Ploutz-Snyder

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Background—The identification of sites of dominant activation frequency during atrial fibrillation (AF) in humans and the effect of ablation at these sites have not been reported. Methods and Results—Thirty-two patients undergoing AF ablation (19 paroxysmal, 13 permanent) during ongoing arrhythmia were studied. Electroanatomic mapping was performed,(More)
Maintaining vitamin D status without sunlight exposure is difficult without supplementation. This study was designed to better understand interrelationships between periodic vitamin D supplementation and immune function in Antarctic workers. The effect of 2 oral dosing regimens of vitamin D supplementation on vitamin D status and markers of immune function(More)
S. E. Snodgrass (1985, 1992) examined interpersonal sensitivity within status-discrepant interactions. Using the correlation between how a participant thought another felt with how that person reported actually feeling, S. E. Snodgrass's measure of interpersonal sensitivity included both the expressivity of one person and the perceptivity of another person.(More)
Despite widespread acceptance of total knee replacement surgery's clinical effectiveness, variation persists in long-term functional outcome. Our aim was to quantify the relative contributions of physical and emotional coexisting conditions to the variation in improvement in 12-month post-total knee replacement physical function. Data from 165 patients who(More)
The purpose of this study was to identify quadriceps femoris strength thresholds below which performance on ambulatory tasks is compromised. A second purpose was to evaluate whether self-reported functioning matches evaluated performance of the activities. Subjects (N = 100; age 73 +/- 0.9 years) participated in isometric knee extension strength tests,(More)
Perennial and intense malaria transmission (holoendemic malaria) and Epstein-Barr virus (EBV) infection are 2 cofactors in the pathogenesis of endemic Burkitt lymphoma (eBL). In the present study, we compared EBV loads in children living in 2 regions of Kenya with differing malaria transmission intensities: Kisumu District, where malaria transmission is(More)
In this study, 107 primary total joint replacement (TJR) patients were assessed preoperatively using the SF-36 (Mental Component Score [MCS] and Physical Component Score [PCS]), Beck Depression Inventory (BDI), Spielberger Trait Anxiety Inventory, Interpersonal Support Evaluation List, and the Coping Strategies Questionnaire. Patients with preoperative MCS(More)
BACKGROUND It is unclear whether atrial fibrillation (AF) drivers in humans are focal or reentrant. To test the hypothesis that functional reentry is involved in human AF maintenance, we determined the effects of adenosine infusion on local dominant frequency (DF) at different atrial sites. By increasing inward rectifier potassium channel conductance,(More)
BACKGROUND Spectral analysis identifies localized sites of high-frequency activity during atrial fibrillation (AF). OBJECTIVE This study sought to determine the effectiveness of using real-time dominant frequency (DF) mapping for radiofrequency ablation of maximal DF (DFmax) sites and elimination of left-to-right frequency gradients in the long-term(More)
OBJECTIVES To test the feasibility and effectiveness of telemedicine to improve care of children with type 1 diabetes in schools. STUDY DESIGN Subjects, ages 5 to 14 years (grades kindergarten through eighth) were randomized to usual care (18 students; 13 schools) or intervention (23 students; 12 schools). Usual care included medical visits every 3 months(More)