Comparison of cryoablation with 3D mapping versus conventional mapping for the treatment of atrioventricular re-entrant tachycardia and right-sided paraseptal accessory pathways

2015 ◽  
Vol 26 (5) ◽  
pp. 931-940 ◽  
Author(s):  
Mario S. Russo ◽  
Fabrizio Drago ◽  
Massimo S. Silvetti ◽  
Daniela Righi ◽  
Corrado Di Mambro ◽  
...  
Keyword(s):  
Radiation Dose ◽  
Success Rate ◽  
Three Dimensional ◽  
Accessory Pathways ◽  
Air Kerma ◽  
Three Dimensional Mapping ◽  
Conventional Mapping ◽  
Area Product ◽  
Patient Radiation Dose ◽  
Dimensional Mapping

AbstractAimTranscatheter cryoablation is a well-established technique for the treatment of atrioventricular nodal re-entry tachycardia and atrioventricular re-entry tachycardia in children. Fluoroscopy or three-dimensional mapping systems can be used to perform the ablation procedure. The aim of this study was to compare the success rate of cryoablation procedures for the treatment of right septal accessory pathways and atrioventricular nodal re-entry circuits in children using conventional or three-dimensional mapping and to evaluate whether three-dimensional mapping was associated with reduced patient radiation dose compared with traditional mapping.MethodsIn 2013, 81 children underwent transcatheter cryoablation at our institution, using conventional mapping in 41 children – 32 atrioventricular nodal re-entry tachycardia and nine atrioventricular re-entry tachycardia – and three-dimensional mapping in 40 children – 24 atrioventricular nodal re-entry tachycardia and 16 atrioventricular re-entry tachycardia.ResultsUsing conventional mapping, the overall success rate was 78.1 and 66.7% in patients with atrioventricular nodal re-entry tachycardia or atrioventricular re-entry tachycardia, respectively. Using three-dimensional mapping, the overall success rate was 91.6 and 75%, respectively (p=ns). The use of three-dimensional mapping was associated with a reduction in cumulative air kerma and cumulative air kerma–area product of 76.4 and 67.3%, respectively (p<0.05).ConclusionsThe use of three-dimensional mapping compared with the conventional fluoroscopy-guided method for cryoablation of right septal accessory pathways and atrioventricular nodal re-entry circuits in children was associated with a significant reduction in patient radiation dose without an increase in success rate.

Acute outcomes of three-dimensional mapping for fluoroscopy reduction in paediatric catheter ablation for supraventricular tachycardia

2021 ◽  
pp. 1-6
Author(s):  
Chris Anderson ◽  
Maryam Rahman ◽  
David J. Bradley ◽  
Kristen Breedlove ◽  
Macdonald Dick ◽  
...  
Keyword(s):  
Catheter Ablation ◽  
Supraventricular Tachycardia ◽  
Three Dimensional ◽  
Study Group ◽  
Success Rates ◽  
Accessory Pathways ◽  
Three Dimensional Mapping ◽  
Prospective Assessment ◽  
Ablation Study ◽  
Dimensional Mapping

Abstract Background: Catheter ablation is a safe and effective therapy for the treatment of supraventricular tachycardia in children. Current improvements in technology have allowed progressive reduction in radiation exposure associated with the procedure. To assess the impact of three-dimensional mapping, we compared acute procedural results collected from the Catheter Ablation with Reduction or Elimination of Fluoroscopy registry to published results from the Prospective Assessment after Pediatric Cardiac Ablation study. Methods: Inclusion and exclusion criteria from the Prospective Assessment after Pediatric Cardiac Ablation study were used as guidelines to select patient data from the Catheter Ablation with Reduction or Elimination of Fluoroscopy registry to compare acute procedural outcomes between cohorts. Outcomes assessed include procedural and fluoroscopy exposure times, success rates of procedure, and complications. Results: In 786 ablation procedures, targeting 498 accessory pathways and 288 atrioventricular nodal reentrant tachycardia substrates, average procedural time (156.5 versus 206.7 minutes, p < 0.01), and fluoroscopy time (1.2 versus 38.3 minutes, p < 0.01) were significantly shorter in the study group. Success rates for the various substrates were similar except for manifest accessory pathways which had a significantly higher success rate in the study group (96.4% versus 93.0%, p < 0.01). Major complication rates were significantly lower in the study group (0.3% versus 1.6%, p < 0.01). Conclusions: In a large, multicentre study, three-dimensional systems show favourable improvements in clinical outcomes in children undergoing catheter ablation of supraventricular tachycardia compared to the traditional fluoroscopic approach. Further improvements are anticipated as technology advances.

The Research of Virtual Assembly of Cotton Picker Roller Based on Virtual Reality

2010 ◽  
Vol 156-157 ◽  
pp. 496-499
Author(s):  
Wen Lei Sun ◽  
Yu Shan Cao ◽  
Wei Sun
Keyword(s):  
Virtual Reality ◽  
Three Dimensional ◽  
Virtual Assembly ◽  
Assembly Process ◽  
Software Environment ◽  
Virtual Scene ◽  
Mapping Software ◽  
Three Dimensional Mapping ◽  
Cotton Picker ◽  
Dimensional Mapping

This paper took the roller of a new cotton picker as the example, drew its various parts and assemblyed overally in the three-dimensional mapping software environment of UG, imported the models into the virtual reality assembly platform by the interface between UG and VAPlatform, added the virtual hand and carried through the virtual assembly in the virtual scene based on the certain assembly restriction in UG. The paper realized the visualization of the assembly path, offered the foundation for the feasible assembly path, and finally obtained the reasonable assembly process, provided a set of reasonable operation guide for the workers to assemble the cotton pickers.

scholarly journals Analysis of Te Inclusion Striations in (Cd,Zn)Te Crystals Grown by Traveling Heater Method

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 649
Author(s):  
Jiaona Zou ◽  
Alex Fauler ◽  
Alexander S. Senchenkov ◽  
Nikolai N. Kolesnikov ◽  
Michael Fiederle
Keyword(s):  
Growth Parameters ◽  
Three Dimensional ◽  
Three Dimensional Mapping ◽  
Zn Content ◽  
Experimental Parameters ◽  
Te Inclusions ◽  
Rich Solution ◽  
Traveling Heater Method ◽  
Periodic Temperature ◽  
Dimensional Mapping

The growth of (Cd,Zn)Te (CZT) crystals and the improvement of the crystal quality are part of a research project towards experiments under microgravity using the Traveling Heater Method (THM). In order to determine the experimental parameters, we performed a detailed ground-based program. Three CZT crystals with a nominal Zn content of 10% were grown using THM from a Te-rich solution. The size and distribution of the Te inclusions were evaluated by transmission infrared microscopy (IR). From the three-dimensional mapping of the inclusions, we observed striation-like patterns in all of the crystals. The correlation between the growth parameters and the formation of these striations was explored and discussed. We found that the inclusion striations are related to periodic temperature variations.

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