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https://www.readbyqxmd.com/read/28227661/parameter-optimization-of-pseudo-rigid-body-models-of-mri-actuated-catheters
#1
Tipakorn Greigarn, Taoming Liu, M Cenk Cavusoglu, Tipakorn Greigarn, Taoming Liu, M Cenk Cavusoglu, Taoming Liu, Tipakorn Greigarn, M Cenk Cavusoglu
Simulation and control of a system containing compliant mechanisms such as cardiac catheters often incur high computational costs. One way to reduce the costs is to approximate the mechanisms with Pseudo-Rigid-Body Models (PRBMs). A PRBM generally consists of rigid links connected by spring-loaded revolute joints. The lengths of the rigid links and the stiffnesses of the springs are usually chosen to minimize the tip deflection differences between the PRBM and the compliant mechanism. In most applications, only the relationship between end load and tip deflection is considered...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227087/maximum-likelihood-cardiac-conduction-velocity-estimation-from-sequential-mapping-in-the-presence-of-activation-time-noise-with-unknown-variances
#2
Mohammad Hassan Shariat, Saeed Gazor, Damian Redfearn, Mohammad Hassan Shariat, Saeed Gazor, Damian Redfearn, Mohammad Hassan Shariat, Damian Redfearn
The cardiac conduction velocity (CV) can be estimated by analysing the activation times (ATs) and the locations of the electrodes that are used for the intracardiac electrogram (IEGM) recording. Here, we study the problem of the CV estimation in sequential mapping without using any independent electrogram as a time alignment reference. We assume that the IEGMs are sequentially recorded from several sites, where at each site, at least two of the catheter's electrodes are in contact with the cardiac tissue. We consider the planar wavefront with stable CV that propagates within the recording sites throughout our data collection period...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227086/catheter-simulator-software-tool-to-generate-electrograms-of-any-multi-polar-diagnostic-catheter-from-3d-atrial-tissue
#3
Kristina E Shillieto, Prasanth Ganesan, Anthony J Salmin, Elizabeth M Cherry, Arkady M Pertsov, Behnaz Ghoraani, Kristina E Shillieto, Prasanth Ganesan, Anthony J Salmin, Elizabeth M Cherry, Arkady M Pertsov, Behnaz Ghoraani, Arkady M Pertsov, Behnaz Ghoraani, Anthony J Salmin, Kristina E Shillieto, Elizabeth M Cherry, Prasanth Ganesan
Simulations are excellent tools for assessing new therapeutic strategies and are often conducted before implementing new therapy options in a clinical practice. For patients suffering from a heart arrhythmia, the main source of information comes from an intracardiac catheter. One of the common catheters is a Lasso multi-pole diagnostic catheter, which is a catheter that has 20 electrodes in a circular pattern. In this paper, we developed algorithm and simulation software that allows the users to place a multi-pole catheter on the atrial endocardial surface and record electrograms...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227084/development-of-data-acquisition-components-for-simultaneous-recording-of-3d-epicardial-and-surface-ecg-signals-in-the-langendorff-perfusion-apparatus
#4
Ryan Wade Selby, Anup Jonchhe, Chen Kaplan, Coeli M Lopes, Behnaz Ghoraani, Ryan Wade Selby, Anup Jonchhe, Chen Kaplan, Coeli M Lopes, Behnaz Ghoraani, Chen Kaplan, Behnaz Ghoraani, Anup Jonchhe, Coeli M Lopes, Ryan Wade Selby
Sudden Cardiac Death (SCD) claims 7 million lives per year. The importance of myocardial electrogram (EGM) repolarization alternans and surface electrocardiogram (ECG) T-wave alternans is gaining traction for understanding the underlying SCD mechanisms. However, the relationship between the 3D spatial distribution of myocardial EGMs and surface ECG with respect to SCD has yet to be investigated. To make this happen, a modified data acquisition system has been developed and fabricated in conjunction with the Langendorff perfusion system to enable simultaneous recording and analysis of the 3D spatial distribution of myocardial EGMs and the surface ECG...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227080/a-comparison-between-four-techniques-to-measure-cardiac-output
#5
A Pironet, P C Dauby, J G Chase, P Morimont, N Janssen, B Lambermont, S Davidson, T Desaive, A Pironet, P C Dauby, J G Chase, P Morimont, N Janssen, B Lambermont, S Davidson, T Desaive, T Desaive, B Lambermont, P C Dauby, N Janssen, P Morimont, A Pironet, J G Chase, S Davidson
Cardiac output is an important variable when monitoring hemodynamic status. In particular, changes in cardiac output represent the goal of several circulatory management therapies. Unfortunately, cardiac output is very difficult to estimate, either in experimental or clinical settings. The goal of this work is to compare four techniques to measure cardiac output: pressure-volume catheter, aortic flow probe, thermodilution, and the PiCCO monitor. These four techniques were simultaneously used during experiments of fluid and endotoxin administration on 7 pigs...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226941/large-deflection-statics-analysis-of-active-cardiac-catheters-through-co-rotational-modelling
#6
Peng Qi, Chen Qiu, Aadarsh Mehndiratta, I-Ming Chen, Haoyong Yu, Peng Qi, Chen Qiu, Aadarsh Mehndiratta, I-Ming Chen, Haoyong Yu, Peng Qi, Aadarsh Mehndiratta, I-Ming Chen, Haoyong Yu, Chen Qiu
This paper presents a co-rotational concept for large-deflection formulation of cardiac catheters. Using this approach, the catheter is first discretized with a number of equal length beam elements and nodes, and the rigid body motions of an individual beam element are separated from its deformations. Therefore, it is adequate for modelling arbitrarily large deflections of a catheter with linear elastic analysis at the local element level. A novel design of active cardiac catheter of 9 Fr in diameter at the beginning of the paper is proposed, which is based on the contra-rotating double helix patterns and is improved from the previous prototypes...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226730/rf-induced-energy-for-partially-implanted-catheters-a-computational-study
#7
Elena Lucano, Micaela Liberti, Tom Lloyd, Francesca Apollonio, Steve Wedan, Wolfgang Kainz, Leonardo M Angelone, Elena Lucano, Micaela Liberti, Tom Lloyd, Francesca Apollonio, Steve Wedan, Wolfgang Kainz, Leonardo M Angelone, Elena Lucano, Leonardo M Angelone, Tom Lloyd, Steve Wedan, Francesca Apollonio, Wolfgang Kainz, Micaela Liberti
Magnetic Resonance Imaging (MRI) is a radiological imaging technique widely used in clinical practice. MRI has been proposed to guide the catheters for interventional procedures, such as cardiac ablation. However, there are risks associated with this procedure, such as RF-induced heating of tissue near the catheters. The aim of this study is to develop a quantitative RF-safety method for patients with partially implanted leads at 64 MHz. RF-induced heating is related to the electric field incident along the catheter, which in turns depends on several variables, including the position of the RF feeding sources and the orientation of the polarization, which are however often unknown...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226546/cardiac-conduction-velocity-estimation-from-sequential-mapping-assuming-known-gaussian-distribution-for-activation-time-estimation-error
#8
Mohammad Hassan Shariat, Saeed Gazor, Damian Redfearn, Mohammad Hassan Shariat, Saeed Gazor, Damian Redfearn, Saeed Gazor, Mohammad Hassan Shariat, Damian Redfearn
In this paper, we study the problem of the cardiac conduction velocity (CCV) estimation for the sequential intracardiac mapping. We assume that the intracardiac electrograms of several cardiac sites are sequentially recorded, their activation times (ATs) are extracted, and the corresponding wavefronts are specified. The locations of the mapping catheter's electrodes and the ATs of the wavefronts are used here for the CCV estimation. We assume that the extracted ATs include some estimation errors, which we model with zero-mean white Gaussian noise values with known variances...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226544/kurtosis-as-a-statistical-approach-to-identify-the-pivot-point-of-the-rotor
#9
Shivaram P Arunachalam, Elizabeth M Annoni, Siva K Mulpuru, Paul A Friedman, Elena G Tolkacheva, Shivaram P Arunachalam, Elizabeth M Annoni, Siva K Mulpuru, Paul A Friedman, Elena G Tolkacheva, Elena G Tolkacheva, Paul A Friedman, Elizabeth M Annoni, Siva K Mulpuru, Shivaram P Arunachalam
Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia that causes stroke affecting more than 2.3 million people in the US. Catheter ablation to terminate AF is successful for paroxysmal AF but suffers limitations with persistent AF patients as current mapping methods cannot identify AF active substrates outside of pulmonary vein region. In this work, we developed a novel Kurtosis based mapping technique that can accurately identify pivot points of the rotors that were induced in ex-vivo isolated rabbit heart...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225355/assessing-cardiac-function-from-total-variation-regularized-4-d-c-arm-ct-in-the-presence-of-angular-undersampling
#10
Oliver Taubmann, Viktor Haase, Guenter Lauritsch, Yefeng Zheng, Gregor Krings, Joachim Hornegger, Andreas Maier
Time-resolved tomographic cardiac imaging using an angiographic C-arm device may support clinicians during minimally invasive therapy by enabling a thorough analysis of the heart function directly in the catheter laboratory. However, clinically feasible acquisition protocols entail a highly challenging reconstruction problem which suffers from sparse angular sampling of the trajectory. Compressed sensing theory promises that useful images can be recovered despite massive undersampling by means of sparsity-based regularization...
February 22, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28223832/time-and-resources-of-peripherally-inserted-central-catheter-insertion-procedures-a-comparison-between-blind-insertion-chest-x-ray-and-a-real-time-tip-navigation-and-confirmation-system
#11
Kenneth J Tomaszewski, Nicole Ferko, Sarah S Hollmann, Simona C Eng, Howard M Richard, Lynn Rowe, Susan Sproule
BACKGROUND: The Sherlock 3CG™ Tip Confirmation System (TCS) provides real-time peripherally inserted central catheter (PICC) tip insertion information using passive magnetic navigation and patient cardiac electrical activity. It is an alternative tip confirmation method to fluoroscopy or chest X-ray for PICC tip insertion confirmation in adults. The purpose of this study was to evaluate time and cost of the Sherlock 3CG TCS and blind insertion with chest X-ray tip confirmation (BI/CXR) for PICC insertions...
2017: ClinicoEconomics and Outcomes Research: CEOR
https://www.readbyqxmd.com/read/28222988/thirty-day-and-90-day-hospital-readmission-after-outpatient-upper-extremity-hemodialysis-access-creation
#12
Jeffrey J Siracuse, Nishant K Shah, Matthew R Peacock, Georges Tahhan, Jeffrey A Kalish, Denis Rybin, Mohammad H Eslami, Alik Farber
OBJECTIVE: Patients with end-stage renal disease have multiple comorbidities and are at increased risk for postoperative complications and resource utilization. Our goal was to determine the rate and causes of 30-day and 90-day hospital readmissions after the creation of outpatient hemodialysis access. METHODS: We retrospectively reviewed all outpatient upper extremity hemodialysis access creations performed at our medical center from 2008 to 2015. Readmission was defined as any inpatient status admission ≤30 and 90 days...
February 17, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28222749/the-impact-of-trans-catheter-aortic-valve-replacement-induced-left-bundle-branch-block-on-cardiac-reverse-remodeling
#13
Laura E Dobson, Tarique A Musa, Akhlaque Uddin, Timothy A Fairbairn, Owen J Bebb, Peter P Swoboda, Philip Haaf, James Foley, Pankaj Garg, Graham J Fent, Christopher J Malkin, Daniel J Blackman, Sven Plein, John P Greenwood
BACKGROUND: Left bundle branch block (LBBB) is common following trans-catheter aortic valve replacement (TAVR) and has been linked to increased mortality, although whether this is related to less favourable cardiac reverse remodeling is unclear. The aim of the study was to investigate the impact of TAVR induced LBBB on cardiac reverse remodeling. METHODS: 48 patients undergoing TAVR for severe aortic stenosis were evaluated. 24 patients with new LBBB (LBBB-T) following TAVR were matched with 24 patients with a narrow post-procedure QRS (nQRS)...
February 22, 2017: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/28219130/-the-value-of-brachial-artery-peak-velocity-variation-during-the-valsalva-maneuver-to-predict-fluid-responsiveness
#14
L F Sheng, M Yan, F J Zhang, Q S Ren, S H Yu, M Wu
Objective: To evaluate whether brachial artery peak velocity variation(ΔVp) during a Valsalva maneuver(VM) could predict fluid responsiveness in spontaneously breathing patients. Methods: Ninety-six patients required radial artery catheter for elective surgery of Ningbo Yinzhou People's Hospital from December 2014 to June 2016 were enrolled. The brachial artery Doppler signal was recorded to measure the ΔVp while the VM was performed.Then doing the volume expansion (VE) , the cardiac output variation (ΔCO) before and after VE were measured...
February 14, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28218354/dialysis-access-infections-and-hospitalisations-in-unplanned-dialysis-start-patients-results-from-the-options-study
#15
Anna Machowska, Mark D Alscher, Satyanarayana Reddy Vanga, Michael Koch, Michael Aarup, Abdul R Qureshi, Bengt Lindholm, Peter Rutherford
INTRODUCTION: Unplanned dialysis start (UPS) associates with worse clinical outcomes, higher utilisation of healthcare resources, lower chances to select dialysis modality and UPS patients typically commenced in-centre haemodialysis (HD) with central venous catheter (CVC). We evaluated patient outcomes and healthcare utilisation depending on initial dialysis access (CVC or PD catheter) and subsequent pathway of UPS patients. METHODS: In this study patient demographics, access procedures, hospitalisations, and major infectious complications were analysed over 12 months in 270 UPS patients...
February 11, 2017: International Journal of Artificial Organs
https://www.readbyqxmd.com/read/28217690/iatrogenic-acute-ascending-aortic-dissection-with-intramural-hematoma-during-coronary-artery-stenting-a-case-report
#16
Mohamad El-Haress, Hicham Daadaa, Shima Shahjouei, Firas El-Bitar, Hisham Bahmad
BACKGROUND: Iatrogenic acute ascending aortic dissection during percutaneous coronary intervention (PCI) is an exceptionally rare and life-threatening sequel that requires early and accurate diagnosis along with rapid management. No guidelines have yet been established to direct decisions on the different treatment options that can be employed in the setting of acute aortic dissections caused by PCI. However, similar cases have been treated either by intracoronary stenting and conservative management as in localized aortocoronary dissections or by surgical intervention in cases of extensive aortic dissections...
2017: Frontiers in Surgery
https://www.readbyqxmd.com/read/28214966/anomalous-coronary-arteries-and-myocardial-bridges-risk-stratification-in-children-using-novel-cardiac-catheterization-techniques
#17
Hitesh Agrawal, Silvana Molossi, Mahboob Alam, S Kristen Sexson-Tejtel, Carlos M Mery, E Dean McKenzie, Charles D Fraser, Athar M Qureshi
The evaluation of the vast majority of children with anomalous aortic origin of a coronary artery (AAOCA) and/or myocardial bridges is performed with non-invasive testing. However, a subset of these patients may benefit from invasive testing for risk stratification. All patients included in the Coronary Anomalies Program (CAP) at Texas Children's Hospital who underwent cardiac catheterization were included. Techniques included selective coronary angiograms (SCA), intravascular ultrasound (IVUS), and fractional flow reserve (FFR) measurements with provocative testing using adenosine and/or dobutamine infusions...
February 18, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/28214482/catheter-directed-ultrasound-assisted-thrombolysis-is-a-safe-and-effective-treatment-for-pulmonary-embolism-even-in-high-risk-patients
#18
Kristen A Lee, Andrew Cha, Mark H Kumar, Combiz Rezayat, Clifford M Sales
OBJECTIVE: We sought to assess the early success and safety of catheter-directed, ultrasound-assisted (CDUA) thrombolysis for acute pulmonary embolism (PE) in patients deemed to be "high risk" for thrombolytic therapy. METHODS: A retrospective evaluation of patients who underwent CDUA pulmonary thrombolysis in our practice during 39 months is reported. There were 91 patients considered, all of whom presented with acute PE as diagnosed by computed tomography angiography...
March 2017: Journal of Vascular Surgery. Venous and Lymphatic Disorders
https://www.readbyqxmd.com/read/28214141/feasibility-and-safety-of-same-day-discharge-after-complex-percutaneous-coronary-intervention-using-forearm-approach
#19
Michael Koutouzis, Aris Karatasakis, Emmanouil S Brilakis, Maria Agelaki, Christos Maniotis, Panagiotis Dimitriou, Efstathios Lazaris
OBJECTIVES: We sought to assess the feasibility and safety of same-day discharge (SDD) after complex percutaneous coronary intervention (PCI) using a forearm approach. BACKGROUND: SDD has been shown to be safe after elective, low-risk PCI. However, the feasibility and safety of SDD in more complex patients and lesions has received limited study. METHODS: We retrospectively reviewed 1190 elective PCIs that were performed between January 2013 and December 2015 at the Red Cross General Hospital...
February 8, 2017: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/28213377/interventional-treatment-of-pulmonary-embolism
#20
David M Dudzinski, Jay Giri, Kenneth Rosenfield
Pulmonary embolism (PE) is a serious and prevalent cause of vascular disease. Nevertheless, optimal treatment for many phenotypes of PE remains uncertain. Treating PE requires appropriate risk stratification as a first step. For the highest-risk PE, presenting as shock or arrest, emergent systemic thrombolysis or embolectomy is reasonable, while for low-risk PE, anticoagulation alone is often chosen. Normotensive patients with PE but with indicia of right heart dysfunction (by biomarkers or imaging) constitute an intermediate-risk group for whom there is controversy on therapeutic strategy...
February 2017: Circulation. Cardiovascular Interventions
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