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https://www.readbyqxmd.com/read/28857171/characterization-of-swallow-modulation-in-response-to-bolus-volume-in-healthy-subjects-accounting-for-catheter-diameter
#1
Lara Ferris, Mistyka Schar, Lisa McCall, Sebastian Doeltgen, Ingrid Scholten, Nathalie Rommel, Charles Cock, Taher Omari
OBJECTIVES/HYPOTHESIS: Characterization of the pharyngeal swallow response to volume challenges is important for swallowing function assessment. The diameter of the pressure-impedance recording catheter may influence these results. In this study, we captured key physiological swallow measures in response to bolus volume utilizing recordings acquired by two catheters of different diameter. STUDY DESIGN: Ten healthy adults underwent repeat investigations with 8- and 10-Fr catheters...
August 31, 2017: Laryngoscope
https://www.readbyqxmd.com/read/28841588/thrombosis-in-adult-patients-with-acute-leukemia
#2
Maria Ilaria Del Principe, Domenico Del Principe, Adriano Venditti
PURPOSE OF REVIEW: Recent studies indicate that the risk of thrombosis in hematologic patients may be similar or even higher than that found in patients with solid tumors. However, available information about pathogenesis and incidence of thrombosis in acute leukemia is limited. This review focuses on mechanisms underlying thrombosis in acute leukemia and discusses recent literature data. RECENT FINDINGS: In the last few years, proofs have been provided that leukemic cells release free prothrombotic products, such as micro-vesicles, tissue factors, circulating free DNA and RNA...
August 24, 2017: Current Opinion in Oncology
https://www.readbyqxmd.com/read/28833720/near-field-impedance-accurately-distinguishes-among-pericardial-intracavitary-and-anterior-mediastinal-position
#3
David A Burkland, Anand V Ganapathy, Mathews John, Brian D Greet, Mohammad Saeed, Abdi Rasekh, Mehdi Razavi
INTRODUCTION: Epicardial catheter ablation is increasingly used to treat arrhythmias with an epicardial component. Nevertheless, percutaneous epicardial access remains associated with a significant risk of major complications. Developing a technology capable of confirming proper placement within the pericardial space could decrease complication rates. The purpose of this study was to examine differences in bioimpedance among the pericardial space, anterior mediastinum, and right ventricle...
August 22, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28816432/an-integrated-microsystem-for-real-time-detection-and-threshold-activated-treatment-of-bacterial-biofilms
#4
Sowmya Subramanian, Ekaterina I Tolstaya, Thomas E Winkler, William E Bentley, Reza Ghodssi
Bacterial biofilms are the primary cause of infections in medical implants and catheters. Delayed detection of biofilm infections contributes to the widespread use of high doses of antibiotics, leading to the emergence of antibiotic-resistant bacterial strains. Accordingly, there is an urgent need for systems that can rapidly detect and treat biofilm infections in situ. As a step toward this goal, in this work we have developed for the first time a threshold-activated feedback-based impedance sensor-treatment system for combined real-time detection and treatment of biofilms...
September 5, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28805112/casting-doubt-on-the-value-of-assessing-the-cardiac-index-in-pregnancy
#5
Maya Ram, Anat Lavie, Shaul Lev, Yair Blecher, Uri Amikam, Yael Shulman, Tomer Avnon, Eran Weiner, Ariel Many
OBJECTIVES: The objective of this study is to assess the reliability of the cardiac index (CI) in healthy pregnant women at term by investigating the correlation between the cardiac output (CO) and the body surface area (BSA) using a novel non-invasive cardiography technique (NICaS™). METHODS: Sixty-one healthy, normotensive women with a singleton pregnancy at term (≥37 gestational weeks) participated in this prospective observational study between 1/2015 and 6/2015 L...
August 13, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28765087/circadian-variability-patterns-predict-and-guide-premature-ventricular-contraction-ablation-procedural-inducibility-and-outcomes
#6
David Hamon, Guillaume Abehsira, Kai Gu, Albert Liu, Marie Blaye-Felice Sadron, Sophie Billet, Thomas Kambur, Mohammed Amer Swid, Noel G Boyle, Gopi Dandamudi, Philippe Maury, Minglong Chen, John M Miller, Nicolas Lellouche, Kalyanam Shivkumar, Jason S Bradfield
BACKGROUND: Infrequent intraprocedural premature ventricular complexes (PVCs) may impede radiofrequency catheter ablation (RFA) outcome, and pharmacologic induction is unpredictable. OBJECTIVE: The purpose of this study was to determine whether PVC circadian variation could help predict drug response. METHODS: Consecutive patients referred for RFA with detailed Holter monitoring and frequent monomorphic PVCs were included. Patients were divided into 3 groups based on hourly PVC count relationship to corresponding mean heart rate (HR) during each of the 24 hours on Holter: fast-HR-dependent PVC (F-HR-PVC) type for a positive correlation (Pearson, P <...
July 29, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28742775/estimation-of-stroke-volume-and-stroke-volume-changes-by-electrical-impedance-tomography
#7
Fernando José da Silva Ramos, André Hovnanian, Rogério Souza, Luciano C P Azevedo, Marcelo B P Amato, Eduardo L V Costa
BACKGROUND: Electrical impedance tomography (EIT) is a noninvasive imaging method that identifies changes in air and blood volume based on thoracic impedance changes. Recently, there has been growing interest in EIT to measure stroke volume (SV). The objectives of this study are as follows: (1) to evaluate the ability of systolic impedance variations (ΔZsys) to track changes in SV in relation to a baseline condition; (2) to assess the relationship of ΔZsys and SV in experimental subjects; and (3) to identify the influence of body dimensions on the relationship between ΔZsys and SV...
July 24, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28738493/-a-case-of-high-impedance-inducedby-radiofrequency-catheter-ablation-of-accessory-pathway
#8
Q Y Zhang, B Jiang, M Liu
No abstract text is available yet for this article.
July 24, 2017: Zhonghua Xin Xue Guan Bing za Zhi
https://www.readbyqxmd.com/read/28664343/catheter-ablation-of-atypical-atrial-flutter-a-novel-3d-anatomic-mapping-approach-to-quickly-localize-and-terminate-atypical-atrial-flutter
#9
Sri Sundaram, William Choe, J Ryan Jordan, Nate Mullins, Charles Boorman, Eric J Kessler, Sunil Nath
PURPOSE: This study aims to describe a novel method of High Density Activation Sequence Mapping combined with Voltage Gradient Mapping Overlay (HD-VGM) to quickly localize and terminate atypical atrial flutter. METHODS: Twenty-one patients presenting with 26 different atypical atrial flutter circuits after a previous catheter or surgical AF ablation were studied. HD-VGM was performed with a commercially available impedance-based mapping system to locate and successfully ablate the critical isthmus of each tachycardia circuit...
September 2017: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/28659670/is-the-routine-use-of-impedance-analysis-for-the-diagnosis-of-gastro-esophageal-reflux-disease-more-expensive-than-conventional-ph-monitoring-cost-analysis-of-two-procedures
#10
Nurkan Törer, Özgür Aytaç
Conventional 24-h pH monitoring is the gold standard for the diagnosis of non-erosive, non-acidic gastro-esophageal reflux disease. Multichannel Intraluminal Impedance (MII) analysis markedly improves diagnostic accuracy of non-erosive, non-acidic gastro-esophageal reflux disease. However, MII catheters are more expensive than standard catheters. This study aimed to determine the rates of acid or non-acid reflux and by making a retrospective projection, to predict the costs of two algorithms. We retrospectively reviewed the medical data of 102 patients who presented to our hospital with suspected non-erosive GERD and underwent 24 h impedance/pH-monitoring...
June 2017: Indian Journal of Surgery
https://www.readbyqxmd.com/read/28639728/prospective-use-of-ablation-index-targets-improves-clinical-outcomes-following-ablation-for-atrial-fibrillation
#11
Ahmed Hussein, Moloy Das, Vivek Chaturvedi, Issa Khalil Asfour, Niji Daryanani, Maureen Morgan, Christina Ronayne, Matthew Shaw, Richard Snowdon, Dhiraj Gupta
AIMS: Late recovery of ablated tissue leading to reconnection of pulmonary veins remains common following radiofrequency catheter ablation for AF. Ablation Index (AI), a novel ablation quality marker, incorporates contact force (CF), time, and power in a weighted formula. We hypothesized that prospective use of our previously published derived AI targets would result in better outcomes when compared to CF-guided ablation. METHODS: Eighty-nine consecutive drug-refractory AF patients (49% paroxysmal) underwent AI-guided ablation (AI-group)...
June 22, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28623986/double-prepuncture-as-a-valuable-adjunctive-technique-for-complex-endovenous-ablation
#12
Scarlett Hao, Samantha Cox, Thomas S Monahan, Rajabrata Sarkar
OBJECTIVE: The objective of this study was to characterize the technique and to report the results of double prepuncture used during complex radiofrequency ablation (RFA) in cases of treating multiple incompetent veins or encountering focal obstruction to catheter advancement. METHODS: A double prepuncture technique was applied in patients requiring endovascular ablation of multiple veins and patients with great saphenous vein cannulation failure. We treated 13 limbs in 12 patients during a 24-month period with RFA in which the double prepuncture technique was used...
July 2017: Journal of Vascular Surgery. Venous and Lymphatic Disorders
https://www.readbyqxmd.com/read/28622178/labor-analgesia-onset-with-dural-puncture-epidural-versus-traditional-epidural-using-a-26-gauge-whitacre-needle-and-0-125-bupivacaine-bolus-a-randomized-clinical-trial
#13
Sylvia H Wilson, Bethany J Wolf, Kellie N Bingham, Quiana S Scotland, John M Fox, Erick M Woltz, Latha Hebbar
BACKGROUND: Lumbar epidurals (LEs) provide excellent analgesia. Combined spinal epidural and dural puncture epidural (DPE) are 2 techniques to expedite neuraxial analgesia onset. In DPE, dura is punctured but medication is not administered in the cerebrospinal fluid. Expedited analgesia onset has been demonstrated with DPE, using 0.25% bupivacaine; however, this concentration may impede an unassisted vaginal birth and is not currently used for induction and maintenance of labor analgesia...
June 14, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28598912/cardiac-output-measurements-based-on-the-pulse-wave-transit-time-and-thoracic-impedance-exhibit-limited-agreement-with-thermodilution-method-during-orthotopic-liver-transplantation
#14
Aurora Magliocca, Emanuele Rezoagli, Thomas Anthony Anderson, Sara Maria Burns, Fumito Ichinose, Hovig Vatche Chitilian
BACKGROUND: Orthotopic liver transplantation (OLT) is characterized by significant intraoperative hemodynamic variability. Accurate and real-time cardiac output (CO) monitoring aids clinical decision making during OLT. The purpose of this study is to compare accuracy, precision, and trending ability of CO estimation obtained noninvasively using pulse wave transit time (estimated continuous cardiac output [esCCO; Nihon Kohden, Tokyo, Japan]) or thoracic bioimpedance (ICON; Osypka Medical GmbH, Berlin, Germany) to thermodilution cardiac output (TDCO) measured with a pulmonary artery catheter...
June 8, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28582283/reservoir-pressure-analysis-of-aortic-blood-pressure-an-in-vivo-study-at-five-locations-in-humans
#15
Om Narayan, Kim H Parker, Justin E Davies, Alun D Hughes, Ian T Meredith, James D Cameron
INTRODUCTION: The development and propagation of the aortic blood pressure wave remains poorly understood, despite its clear relevance to major organ blood flow and potential association with cardiovascular outcomes. The reservoir pressure model provides a unified description of the dual conduit and reservoir functions of the aorta. Reservoir waveform analysis resolves the aortic pressure waveform into an excess (wave related) and reservoir (compliance related) pressure. The applicability of this model to the pressure waveform as it propagates along the aorta has not been investigated in humans...
October 2017: Journal of Hypertension
https://www.readbyqxmd.com/read/28572979/complex-effects-of-high-flow-nasal-cannula-therapy-on-hemodynamics-in-the-pediatric-patient-after-cardiac-surgery
#16
EDITORIAL
Yu Inata, Muneyuki Takeuchi
BACKGROUND: The high-flow nasal cannula (HFNC) system has been widely used for children in various clinical settings. However, the physiological and clinical impact of HFNC therapy on the pediatric patient with respiratory distress after cardiac surgery has not been thoroughly investigated. MAIN BODY OF THE ABSTRACT: It seems logical to use HFNC as a primary therapy for post-extubation respiratory failure after congenital heart surgery, in which low cardiac output syndrome and upper airway obstruction are commonly encountered; the HFNC therapy alleviates the work of breathing and large negative swings of intrathoracic pressure, which in turn helps to decrease the systemic ventricular afterload...
2017: Journal of Intensive Care
https://www.readbyqxmd.com/read/28569739/endoscopic-guided-measurement-of-mucosal-admittance-can-discriminate-gastroesophageal-reflux-disease-from-functional-heartburn
#17
Tomoaki Matsumura, Hideaki Ishigami, Mai Fujie, Takashi Taida, Shingo Kasamatsu, Kenichiro Okimoto, Keiko Saito, Daisuke Maruoka, Tomoo Nakagawa, Takeshi Suzuki, Tatsuro Katsuno, Makoto Arai
OBJECTIVES: A novel catheter that can measure mucosal admittance (MA), the inverse of impedance, was developed recently. In this pilot study, we aimed to clarify the usefulness of measuring MA for diagnosing gastroesophageal reflux disease (GERD). METHODS: We conducted two prospective studies. In the first study, esophageal MA was evaluated in 120 participants (24 with erosive esophagitis, 82 with heartburn but non-erosive esophagitis, and 14 healthy volunteers) and compared with the endoscopic findings...
June 1, 2017: Clinical and Translational Gastroenterology
https://www.readbyqxmd.com/read/28550489/impedance-ph-monitoring-for-diagnosis-of-reflux-disease-new-perspectives
#18
REVIEW
Marzio Frazzoni, Nicola de Bortoli, Leonardo Frazzoni, Salvatore Tolone, Vincenzo Savarino, Edoardo Savarino
Heartburn is the most specific symptom of gastroesophageal reflux disease (GERD). In clinical practice, heartburn relief by a proton pump inhibitor (PPI) trial does suffice to confirm GERD. However, an objective diagnosis of GERD is required before anti-reflux endoscopic or surgical interventions, independently from PPI response. Thus, since normal findings at upper endoscopy are detected in the majority of patients with heartburn, reflux monitoring is often required. When traditional catheter-based or wireless pH tests are used, reflux episodes are conventionally identified by pH drops below 4...
August 2017: Digestive Diseases and Sciences
https://www.readbyqxmd.com/read/28543389/coexistence-of-a-permanent-form-of-a-junctional-reciprocating-tachycardia-and-coronary-sinus-aneurysm-a-case-report
#19
Yuki Shimizu, Osamu Inaba, Masahiko Goya, Kenzo Hirao
A 58-year-old man with a long R-P' narrow QRS tachycardia underwent an electrophysiological study. The tachycardia was diagnosed as a permanent form of junctional reciprocating tachycardia (PJRT), and the earliest atrial activation site during tachycardia was coronary sinus (CS) ostium. Radiofrequency ablation at the site was initially not successful because the tip impedance and temperature were unstable. After changing of the ablation catheter to that with contact force sensor, the accessory pathway was immediately ablated and the PJRT was no longer induced...
May 24, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/28543374/ultrasound-phantom-using-sodium-alginate-as-a-gelling-agent
#20
Minoru Aoyagi, Tomomi Hiraguri
For medical workers, ultrasound phantoms for human soft tissue are used not only for accuracy management of ultrasound diagnosis but also to aid ultrasound-guided needle and blind catheter insertion training without risk to real patients. For the phantoms, ultrasound characteristics and a texture are required to mimic the human soft tissue. The proposed phantom was composed of sodium alginate, calcium sulfate dihydrate, trisodium phosphate 12-hydrate, glycerol, and water. The propagation speed, attenuation coefficient, acoustic impedance, and texture of the proposed phantom were almost the same as those of human soft tissue...
May 23, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
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