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impedance catheter

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https://www.readbyqxmd.com/read/29761349/intracochlear-administration-of-steroids-with-a-catheter-during-human-cochlear-implantation-a-safety-and-feasibility-study
#1
Nils K Prenzler, Rolf Salcher, Max Timm, Lutz Gaertner, Thomas Lenarz, Athanasia Warnecke
Suppression of foreign body reaction, improvement of electrode-nerve interaction, and preservation of residual hearing are essential research topics in cochlear implantation. Intracochlear pharmaco- or cell-based therapies can open new horizons in this field. Local drug delivery strategies are desirable as higher local concentrations of agents can be realized and side effects can be minimized compared to systemic administrations. When administered locally at accessible, basal parts of the cochlea, drugs reach apical regions later and in much lower concentrations due to poor diffusion patterns in cochlear fluids...
May 14, 2018: Drug Delivery and Translational Research
https://www.readbyqxmd.com/read/29759495/in-vitro-validation-of-the-lesion-size-index-to-predict-lesion-width-and-depth-after-irrigated-radiofrequency-ablation-in-a-porcine-model
#2
Vittorio Calzolari, Luca De Mattia, Stefano Indiani, Martino Crosato, Alberto Furlanetto, Claudia Licciardello, Paolo Antonio Maria Squasi, Zoran Olivari
OBJECTIVES: In an in vitro model, the authors tested the hypotheses that: 1) lesion dimensions correlate with lesion size index (LSI); and 2) LSI could predict lesion dimensions better than power, contact force (CF), and force-time integral (FTI). BACKGROUND: When performing radiofrequency (RF) catheter ablation for cardiac arrhythmias, reliable predictors of lesion quality are lacking. The LSI is a multiparametric index incorporating time, power, CF, and impedance recorded during ablation...
October 2017: JACC. Clinical Electrophysiology
https://www.readbyqxmd.com/read/29759489/ablation-index-and-surround-flow-catheter-irrigation-impedance-based-appraisal-in-clinical-ablation
#3
Waqas Ullah, Ross J Hunter, Malcolm C Finlay, Ailsa McLean, Mehul B Dhinoja, Simon Sporton, Mark J Earley, Richard J Schilling
OBJECTIVES: This study sought to assess the impact of ablation power and catheter irrigation during clinical radiofrequency ablation using impedance drop. BACKGROUND: In preclinical studies, ablation power and catheter irrigation are determinants of ablation efficacy. METHODS: Static 30-s left atrial ablations were delivered in patients undergoing their first atrial fibrillation ablation. Impedance drop during ablation (as a measure of efficacy) was compared using the following: the force time integral (FTI); the FTI-P (a cumulative multiple FTI and ablation power), and ablation index (AI), a weighted algorithm including contact force, power, and duration...
October 2017: JACC. Clinical Electrophysiology
https://www.readbyqxmd.com/read/29745622/noninvasive-assessment-of-cardiac-index-using-impedance-cardiography-during-liver-transplantation-surgery-a-comparison-with-pulmonary-artery-thermodilution
#4
Vlad Suparschi, Eric Le Bihan, Amélie Toussaint, Diana Saptefrat, Heykel Ben Abdallah, Faouzi Gloulou, Farida Aouati, Tobias Gauss, Catherine Paugam-Burtz
BACKGROUND: Liver Transplantation (LT) is a high-risk surgery associated with significant hemodynamic changes requiring advanced hemodynamic monitoring. Pulmonary Artery Catheter (PAC) is still considered as a gold-standard for cardiac index (CI) measurement during LT despite association with an increased risk of complications. Noninvasive impedance cardiography (ICG) could be an interesting alternative tool for CI monitoring. The aim of this study was to compare the precision and trending ability of ICG versus PAC methods during LT...
May 9, 2018: Minerva Anestesiologica
https://www.readbyqxmd.com/read/29680971/use-of-impedance-based-catheter-tip-to-tissue-contact-assessment-electroanatomic-coupling-index-eci-in-typical-right-atrial-flutter-ablation
#5
Massimiliano Maines, Francesco Peruzza, Alessandro Zorzi, Domenico Catanzariti, Carlo Angheben, Maurizio Del Greco
PURPOSE: The electrical coupling index (ECI) (Abbott, USA) is a marker of tissue contact and ablation depth developed particularly for atrial fibrillation treatment. We sought to evaluate if these measures can be also a marker of lesion efficacy during cavotricuspid isthmus (CTI) ablation for typical right atrial flutter. METHODS: We assessed the ECI values in patients undergoing typical right atrial flutter point-by-point ablation guided by the Ensite Velocity Contact™ (St...
April 21, 2018: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/29675812/a-new-venous-entry-detection-method-based-on-electrical-bio-impedance-sensing
#6
Zhuoqi Cheng, Brian L Davies, Darwin G Caldwell, Leonardo S Mattos
Peripheral intravenous catheterization (PIVC) is frequently required for various medical treatments. Over 1 billion PIVC operations are performed per year in the United States alone. However, this operation is characterized by a very low success rate, especially amongst pediatric patients. Statistics show that only 53% of first PIVC attempts are successful in pediatric patients. Since their veins are small and readily rupture, multiple attempts are commonly required before successfully inserting the catheter into the vein...
April 19, 2018: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/29618475/novel-measure-of-local-impedance-predicts-catheter-tissue-contact-and-lesion-formation
#7
Matthew S Sulkin, Jacob I Laughner, Sebastian Hilbert, Suraj Kapa, Jedrzej Kosiuk, Paul Younan, Iñaki Romero, Allan Shuros, Jason J Hamann, Gerhard Hindricks, Andreas Bollmann
BACKGROUND: Coupling between the ablation catheter and myocardium is critical to resistively heat tissue with radiofrequency ablation. The objective of this study was to evaluate whether a novel local impedance (LI) measurement on an ablation catheter identifies catheter-tissue coupling and is predictive of lesion formation. METHODS AND RESULTS: LI was studied in explanted hearts (n=10 swine) and in vivo (n=10; 50-70 kg swine) using an investigational electroanatomic mapping system that measures impedance from an ablation catheter with mini-electrodes incorporated in the distal electrode (Rhythmia and IntellaNav MiFi OI, Boston Scientific)...
April 2018: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/29603269/nutrition-delivery-during-pediatric-extracorporeal-membrane-oxygenation-therapy
#8
Lindsey B Armstrong, Katelyn Ariagno, Craig D Smallwood, Charles Hong, Mary Arbuthnot, Nilesh M Mehta
BACKGROUND: Macronutrient delivery during pediatric ECMO therapy can be challenging. We examined predictors of nutrient delivery in the first 2 weeks of extracorporeal membrane oxygenation (ECMO) therapy in the pediatric intensive care unit (ICU). METHODS: Details of macronutrient delivery were recorded in children (newborn-18 years of age) who survived 24 hours after cannulation to ECMO over a 3-year period (2012-2015). RESULTS: We analyzed data from 54 consecutive eligible patients, 43% female, with median (interquartile range) ECMO duration of 8...
March 30, 2018: JPEN. Journal of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/29587251/pregnancy-outcomes-in-french-hemodialysis-patients
#9
Gabrielle Normand, Xiaoli Xu, Marine Panaye, Anne Jolivot, Sandrine Lemoine, Fitsum Guebre-Egziabher, Evelyne Decullier, Sylvie Bin, Muriel Doret, Laurent Juillard
BACKGROUND: Pregnancy in hemodialysis (HD) women is a rare event and often associated with maternal and fetal complications. Scarcity of available data from large cohorts impedes fair medical counseling. METHODS: This is a descriptive, retrospective, multi-centric study. Pregnant women on HD during the period from 1985 to 2015 in France were included. The primary outcome was a living infant discharged from hospital, while secondary outcomes included gestational age and birth weight...
March 27, 2018: American Journal of Nephrology
https://www.readbyqxmd.com/read/29579196/safety-and-efficacy-of-delivering-high-power-short-duration-radiofrequency-ablation-lesions-utilizing-a-novel-temperature-sensing-technology
#10
Guy Rozen, Leon M Ptaszek, Israel Zilberman, Victoria Douglas, E Kevin Heist, Christopher Beeckler, Andres Altmann, Jeremy N Ruskin, Assaf Govari, Moussa Mansour
Aims: Delivery of high-power short-duration radiofrequency (RF) ablation lesions is not commonly used, in part because conventional thermocouple (TC) technology underestimates tissue temperature, increasing the risk of steam pop, and thrombus formation. We aimed to test whether utilization of an ablation catheter equipped with a highly accurate novel TC technology could facilitate safe and effective delivery of high-power RF lesions. Methods and results: Adult male Yorkshire swine were used for the study...
March 22, 2018: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/29460232/atrial-fibrillation-ablation-using-very-short-duration-50-w-ablations-and-contact-force-sensing-catheters
#11
Roger A Winkle, Ryan Moskovitz, R Hardwin Mead, Gregory Engel, Melissa H Kong, William Fleming, Jonathan Salcedo, Rob A Patrawala, John H Tranter, Isaac Shai
PURPOSE: The optimal radiofrequency (RF) power and lesion duration using contact force (CF) sensing catheters for atrial fibrillation (AF) ablation are unknown. We evaluate 50 W RF power for very short durations using CF sensing catheters during AF ablation. METHODS: We evaluated 51 patients with paroxysmal (n = 20) or persistent (n = 31) AF undergoing initial RF ablation. RESULTS: A total of 3961 50 W RF lesions were given (average 77...
June 2018: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/29405323/remote-magnetic-navigation-versus-contact-force-technology-the-two-faces-of-the-ablation-lesion
#12
EDITORIAL
Ahmed AlTurki, Riccardo Proietti
No abstract text is available yet for this article.
February 6, 2018: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/29405314/a-comparison-of-contact-force-and-remote-magnetic-navigation-on-lesion-formation-for-the-ablation-of-atrial-fibrillation
#13
Stefano Grossi, Francesco Grassi, Lorenzo Galleani, Francesca Bianchi, Maria Rosa Conte
RATIONALE: Pulmonary vein isolation (PVI) is the method of choice for the treatment of drug-resistant atrial fibrillation (AF). However, arrhythmia recurrences are frequent due to suboptimal lesions formation and pulmonary vein reconnection. Contact force (CF)- and remote magnetic navigation (RMN)-guided catheters are both capable of improving contact and energy transfer to the tissue, possibly improving PVI outcome. OBJECTIVE: The objective of our study was to compare CF- and RMN-guided PVI in patients with paroxysmal AF in terms of surrogate parameters of the dimension and quality of the lesions...
February 6, 2018: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/29393167/evaluation-of-esophageal-mucosal-integrity-in-patients-with-gastroesophageal-reflux-disease
#14
Tomoaki Matsumura, Makoto Arai, Hideaki Ishigami, Mai Fujie, Kentaro Ishikawa, Naoki Akizue, Takashi Taida, Yuki Ohta, Shinsaku Hamanaka, Kenichiro Okimoto, Keiko Saito, Daisuke Maruoka, Tomoo Nakagawa, Naoya Kato
BACKGROUND: Impaired esophageal mucosal integrity plays a role in causing symptoms of gastroesophageal reflux disease (GERD). Recently, the assessment of esophageal baseline impedance (BI) using the multichannel intraluminal impedance-pH (MII-pH) test was suggested as a surrogate technique for the study of esophageal mucosal integrity and was reported to be useful in distinguishing GERD from non-GERD. However, measuring BI requires a 24-h testing period, is complicated, and causes considerable patient discomfort...
2018: Digestion
https://www.readbyqxmd.com/read/29316567/modern-invasive-hemodynamic-assessment-of-pulmonary-hypertension
#15
Alberto Pagnamenta, Frédéric Lador, Andrea Azzola, Maurice Beghetti
Since 1998 pulmonary hypertension has been clinically classified into five well-defined, distinct categories. A definitive diagnosis of pulmonary hypertension requires the invasive confirmation of an elevated mean pulmonary artery pressure of 25 mm Hg or above during a right heart catheterization. From a hemodynamic point of view, pulmonary hypertension is classified into precapillary and postcapillary pulmonary hypertension on the basis of a pulmonary artery wedge pressure threshold value of 15 mm Hg. Pulmonary vascular resistance is better characterized by multi-point pressure/flow measurements than by single-point determination...
2018: Respiration; International Review of Thoracic Diseases
https://www.readbyqxmd.com/read/29316025/impedance-spectroscopy-measurements-as-a-tool-for-distinguishing-different-luminal-content-during-bolus-transit-studies
#16
A Ruiz-Vargas, R Mohd Rosli, A Ivorra, J W Arkwright
BACKGROUND: Intraluminal electrical impedance is a well-known diagnostic tool used to study bolus movement in the human esophagus. However, it is use in the human colon it is hindered by the fact that the content cannot be controlled and may include liquid, gas, solid, or a mixture of these at any one time. This article investigates the use of complex impedance spectroscopy to study different luminal content (liquid and gas). METHODS: An excised section of guinea pig proximal colon was placed in an organ bath with Krebs solution at 37°C and a custom built bioimpedance catheter was placed in the lumen...
January 8, 2018: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
https://www.readbyqxmd.com/read/29284355/stability-of-sodium-bicarbonate-injection-8-4-in-syringes-over-a-six-week-period-in-refrigerated-temperature
#17
Jack T Seki, Tian Q Wang, Paul M Yip, Tony Mazzulli, Mark D Minden
Background Dysfunctional central venous catheter prohibits the administration of potential life-saving chemotherapy and the delivery of essential supportive care needs to patients. Sodium bicarbonate injection has been shown to impede against fibrin clot formation and prolong prothrombin time and thrombin clotting time. Sodium bicarbonate injection has been tried as a second-line agent with good results in a small number of patients (internal data not published) when alteplase failed. We assessed whether the pre-filled sodium bicarbonate injection in 5 mL syringes would not only preserve sterility and retain its pH and concentration but also amount to the potential cost savings for future use when stored in a refrigerated environment...
April 2018: Journal of Oncology Pharmacy Practice
https://www.readbyqxmd.com/read/29239758/efficacy-and-safety-comparison-between-different-types-of-novel-design-enhanced-open-irrigated-ablation-catheters-in-creating-cavo-tricuspid-isthmus-block
#18
Rikuta Hamaya, Shinsuke Miyazaki, Takatsugu Kajiyama, Tomonori Watanabe, Shigeki Kusa, Hiroaki Nakamura, Hitoshi Hachiya, Yoshito Iesaka
BACKGROUND: Clinical utility of irrigation-tip ablation catheters for cavo-tricuspid isthmus (CTI) ablation is established. Recently, new-generation enhanced-cooling irrigation-tip catheters were introduced into clinical use. This study compared the performance of different types of novel irrigation-tip catheters in CTI ablation. METHODS: One hundred patients undergoing CTI ablation with novel irrigated-tip catheters were included. Ablation was performed with a power output of 30-35W using either 4-mm flexible tip catheters [FlexAbility (FAs) St...
November 24, 2017: Journal of Cardiology
https://www.readbyqxmd.com/read/29235207/discriminating-movements-of-liquid-and-gas-in-the-rabbit-colon-with-impedance-manometry
#19
R Mohd Rosli, R E Leibbrandt, L Wiklendt, M Costa, D A Wattchow, N J Spencer, S J Brookes, T I Omari, P G Dinning
BACKGROUND: High-resolution impedance manometry is a technique that is well established in esophageal motility studies for relating motor patterns to bolus flow. The use of this technique in the colon has not been established. METHODS: In isolated segments of rabbit proximal colon, we recorded motor patterns and the movement of liquid or gas boluses with a high-resolution impedance manometry catheter. These detected movements were compared to video recorded changes in gut diameter...
December 13, 2017: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
https://www.readbyqxmd.com/read/29199161/indications-of-24-h-esophageal-ph-monitoring-capsule-ph-monitoring-combined-ph-monitoring-with-multichannel-impedance-esophageal-manometry-radiology-and-scintigraphy-in-gastroesophageal-reflux-disease
#20
Rukiye Vardar, Muharrem Keskin
Ambulatory esophageal pH monitoring is an essential method in patients exhibiting signs of non-erosive reflux disease (NERD) to make an objective diagnosis. Intra-esophageal pH monitoring is important in patients who are non-responsive to medications and in those with extraesophageal symptoms, particularly in NERD, before surgical interventions. With the help of the wireless capsule pH monitoring, measurements can be made under more physiological conditions as well as longer recordings can be performed because the investigation can be better tolerated by patients...
December 2017: Turkish Journal of Gastroenterology: the Official Journal of Turkish Society of Gastroenterology
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