scholarly journals External defibrillation resulting in loss of ventricular capture during atrial lead testing

Author(s):  
Nicholas Palmeri ◽  
Andrew Locke ◽  
Patricia Tung
Keyword(s):  
Author(s):  
Tamas Szili-Torok ◽  
Jens Rump ◽  
Torsten Luther ◽  
Sing-Chien Yap

Abstract Better understanding of the lead curvature, movement and their spatial distribution may be beneficial in developing lead testing methods, guiding implantations and improving life expectancy of implanted leads. Objective The aim of this two-phase study was to develop and test a novel biplane cine-fluoroscopy-based method to evaluate input parameters for bending stress in leads based on their in vivo 3D motion using precisely determined spatial distributions of lead curvatures. Potential tensile, compressive or torque forces were not subjects of this study. Methods A method to measure lead curvature and curvature evolution was initially tested in a phantom study. In the second phase using this model 51 patients with implanted ICD leads were included. A biplane cine-fluoroscopy recording of the intracardiac region of the lead was performed. The lead centerline and its motion were reconstructed in 3D and used to define lead curvature and curvature changes. The maximum absolute curvature Cmax during a cardiac cycle, the maximum curvature amplitude Camp and the maximum curvature Cmax@amp at the location of Camp were calculated. These parameters can be used to characterize fatigue stress in a lead under cyclical bending. Results The medians of Camp and Cmax@amp were 0.18 cm−1 and 0.42 cm−1, respectively. The median location of Cmax was in the atrium whereas the median location of Camp occurred close to where the transit through the tricuspid valve can be assumed. Increased curvatures were found for higher slack grades. Conclusion Our results suggest that reconstruction of 3D ICD lead motion is feasible using biplane cine-fluoroscopy. Lead curvatures can be computed with high accuracy and the results can be implemented to improve lead design and testing.


PEDIATRICS ◽  
2009 ◽  
Vol 123 (3) ◽  
pp. e376-e385 ◽  
Author(s):  
R. L. Jones ◽  
D. M. Homa ◽  
P. A. Meyer ◽  
D. J. Brody ◽  
K. L. Caldwell ◽  
...  

2007 ◽  
Vol 53 (5) ◽  
pp. 994-995 ◽  
Author(s):  
Robert M Bossarte ◽  
Mary Jean Brown ◽  
Robert L Jones

2008 ◽  
Vol 123 (2) ◽  
pp. 111-116 ◽  
Author(s):  
Erik W. Zabel ◽  
Mary Ellen Smith ◽  
Ann O'Fallon

2013 ◽  
Vol 88 (9-10) ◽  
pp. 1585-1588 ◽  
Author(s):  
Sandra Drotziger ◽  
Klaus-Peter Buscher ◽  
Walter H. Fietz ◽  
Mathias Heiduk ◽  
Reinhard Heller ◽  
...  
Keyword(s):  

Author(s):  
Nurhayati A. Prihartono ◽  
Ratna Djuwita ◽  
Putri B. Mahmud ◽  
Budi Haryanto ◽  
Helda Helda ◽  
...  

This study aimed to assess the prevalence of blood lead levels (BLLs) among children 1 to 5 years old who reside near and distant to informally used lead-acid battery (ULAB) recycling locations and examine risk factors for elevated BLLs. A cross-sectional study was conducted in three greater Jakarta neighborhoods where informal ULAB recycling occurs. Venous BLLs among 279 children were analyzed using portable blood lead testing machines. Demographic, child activities, and sources of lead exposure inside and outside homes were assessed. Multivariate analysis was performed to evaluate factors associated with the prevalence of BLLs. Forty-seven percent of children had BLLs ≥ 5 µg/dL and 9% had BLLs ≥ 10 µg/dL. No differences in geometric mean BLLs were observed between children who lived near and distant to ULAB locations. Older child age groups [Prevalence Ratio (PR) 2.14, 95% Confidence Interval (CI) 1.16, 4.18) and low household income (PR 1.58, 95% CI 1.03, 2.40) were associated with BLLs 5–9 µg/dL. Low educational attainment of the child’s father (PR 3.17, 95% CI 1.23, 8.16) and frequent outdoor child activity (PR 4.93, 95% CI 1.09, 22.21) were predictors of BLLs ≥ 10 µg/dL. This study shows the association between lead exposure among children and environmental sources. Public health officials can consider expanded surveillance, health care provider education, and development of strategies to reduce lead exposure.


1996 ◽  
Vol 34 (6) ◽  
pp. 699-702 ◽  
Author(s):  
Elizabeth J. Scharman ◽  
Edward P. Krenzelok
Keyword(s):  

2020 ◽  
Vol 30 (6) ◽  
pp. 890-891
Author(s):  
Peter Kramer ◽  
Felix Berger ◽  
Björn Peters

AbstractWe present a rare case of incidentally diagnosed Twiddler’s syndrome in a child 7 years after implantation of a dual-chamber pacemaker system with epicardial leads. During revision, an insulation defect of the ventricular lead was evident, despite unremarkable prior pacemaker lead testing. The lead was repaired and a new generator was suture-fixated to prevent re-occurrence of generator manipulation.


2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Katlyn Sawyer ◽  
Chris Knaub ◽  
Meghanne Tighe ◽  
Danielle Forbes ◽  
Claire Marks ◽  
...  

Background: The Center for Disease Control recommends case management begin at a blood lead level of 5 μg/dL, yet Indiana does not take action until a blood lead level of 10 μg/dL. Low levels of lead can cause irreversible neurological damage in children. The goal of this study was to design a scalable, low-cost Home Lead Test Kit to proactively find lead in homes.  Methods: Individuals were recruited through community partnerships, community lead testing events, and flyers. Qualitative data was recorded during home visits as participants used the kit. An x-ray fluorescence analyzer was used in the field and laboratory to analyze lead levels of samples. Results were blinded during the analysis.  Results: To date, 40 homes have been recruited, and 20 have been completed. The average completion time of the kit was 23.45 minutes.  Of the 8 pre-1950 homes 100% had elevated lead results, of the 7 1950-1978 homes 43% had elevated lead results, and of the 5 post 1978 homes 0% had elevated lead results.   Conclusion and Potential Impact: The study is ongoing. Preliminary results support the hypothesis that pre-1950 homes have a high risk of lead exposure, and post 1978 homes have minimal to no levels of lead. Feedback from study participants regarding kit usability has been positive. Future plans are to produce a kit to be scaled up in St. Joseph County with the goal of a statewide model. This kit may allow citizens to identify lead hazards to prevent children from lead exposure. 


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