SP-0668 Physics perspective of stereotactic cardiac ablation

2021 ◽  
Vol 161 ◽  
pp. S535-S536
Author(s):  
O. Blanck
Keyword(s):  
Author(s):  
Hessa Alfalahi ◽  
Federico Renda ◽  
Conor Messer ◽  
Cesare Stefanini

While the dilemma of motion tracking and force control in beating-heart surgery is previously addressed using active control architectures and rigid robotic actuators, this work leverages the highly controllable mechanical properties of concentric tube robots for intelligent, design-based force control in minimally invasive cardiac ablation. Briefly, cardiac ablation is the conventional procedure for treating arrhythmia patients, by which exposing the diseased cardiac tissue to Radio-Frequency (RF) energy restores the normal heart rhythm. Yet, the procedure suffers low success rate due to the inability of existing flexible catheters to maintain a consistent, optimal contact force between the tip electrode and the tissue, imposing the need for future repeat surgeries upon disease recurrence. The novelty of our work lies in the development of a statically-balanced compliant mechanism composed of (1) distal bi-stable concentric tubes and (2) a compliant, torsional spring mechanism that provides torque at tubes proximal extremity, resulting in an energy-free catheter with a zero-stiffness tip. This catheter is expected to maintain surgical efficacy and safety despite the chaotic displacement of the heart, by naturally keeping the tip force at an optimal level, not less and not more than the surgical requirement. The presented experimental results of the physical prototype, reflect the feasibility of the proposed design, as well as the robustness of the formulated catheter mathematical models which were uniquely deployed in the selection of the optimal design parameters.


2020 ◽  
Vol 154 (Supplement_1) ◽  
pp. S167-S168
Author(s):  
J M Petersen ◽  
V Patel ◽  
D Jhala

Abstract Introduction/Objective Cardiac perforation is a life-threatening complication (~1% risk, with reported rates between 0.2% to 5%) of CA procedures. As cardiac perforation may lead to extensive bleeding, it would be reasonable for a medical center carrying out CA to be capable of arranging for a massive transfusion protocol and for surgical repair as required. However, there is sparse literature to guide a non-trauma medical center implementing a CA program on what the number of red blood cell (RBC) units for crossmatch should be for each case. Methods In interdisciplinary collaborative meetings, the CA program logistics were agreed to between the multiple clinical services. Given the case series on the amount of drained blood in complicated cases, there was agreement that three units of RBCs would be crossmatched for each case. Education was provided on the massive transfusion protocol and on blood bank procedures. As part of quality assurance/quality improvement, records were reviewed from the beginning of the CA program (10/1/2019) to 1/31/2019 to determine number of patient cases, crossmatched units, and transfused units for quality assurance purposes. Results A total of fifteen patients underwent CA procedures, for which three units were crossmatched for each patient. As there were no cardiac perforations with the cardiac ablation procedures so far, no units were transfused. The organized approach for ensuring adequate blood bank support and education led to the reassurance, alleviation of clinical anxiety, and building of a successful CA program. Education sessions completed with thorough understanding of blood bank procedures including the massive transfusion protocol, labeling of blood bank specimens, and on ordering of blood for crossmatch. Conclusion This study provides a reference that may provide helpful guidance to other blood banks on what the number of RBCs to be crossmatched prior to each CA procedure. Multidisciplinary collaborative meetings in advance are an essential component for ensuring adequate support for CA procedures or any new service that requires blood product support. Thorough education of clinical staff on blood bank procedures particularly the massive transfusion protocol is also recommended. This procedure for massive transfusion should be available to be referred to in real time.


Sensors ◽  
2012 ◽  
Vol 12 (1) ◽  
pp. 1002-1013 ◽  
Author(s):  
Siu Chun Michael Ho ◽  
Mehdi Razavi ◽  
Alireza Nazeri ◽  
Gangbing Song

2016 ◽  
Vol 27 (3) ◽  
pp. 592-596 ◽  
Author(s):  
Amee M. Bigelow ◽  
Brandon S. Arnold ◽  
Gregory C. Padrutt ◽  
John M. Clark

AbstractIn current practice, children with anatomically normal hearts routinely undergo fluoroscopy-free ablations. Infants and children with congenital heart disease (CHD) represent the most difficult population to perform catheter ablation without fluoroscopy. We report two neonatal patients with CHD in whom cardiac ablations were performed without fluoroscopy. The first infant had pulmonary atresia with intact ventricular septum with refractory supraventricular tachycardia, and the second infant presented with Ebstein’s anomaly of the tricuspid valve along with persistent supraventricular tachycardia. Both patients underwent uncomplicated, successful ablation without recurrence of arrhythmias. These cases suggest that current approaches to minimising fluoroscopy may be useful even in challenging patients such as neonates with CHD.


Author(s):  
David A Ramirez ◽  
Weston Upchurch ◽  
Paul A Iaizzo

Abstract As electroporation therapies become more widely used in the cardiac ablation space, there is a critical need to study the potential effects on surrounding tissues: collateral damage. Here we explored methods to study the effects applying electroporative energies on vascular smooth muscle: i.e., loss of vascular function when exposed to energies needed to induce irreversibly electroporative therapy to the myocardium.


2018 ◽  
Vol 4 (11) ◽  
pp. 1481-1482 ◽  
Author(s):  
Damijan Miklavčič
Keyword(s):  

2019 ◽  
Vol 114 (1) ◽  
pp. S1668-S1668
Author(s):  
Mamoon Ur Rashid ◽  
Muzammil Muhammad Khan ◽  
Waqas Ullah ◽  
Hammad Zafar ◽  
Ishtiaq Hussain ◽  
...  

2000 ◽  
Vol 38 (5) ◽  
pp. 562-568 ◽  
Author(s):  
S. Tungjitkusolmun ◽  
E. J. Woo ◽  
H. Cao ◽  
J. Z. Tsai ◽  
V. R. Vorperian ◽  
...  

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