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https://www.readbyqxmd.com/read/29519291/-esophageal-pressure-and-transpulmonary-pressure-monitoring
#1
Xiumei Sun, Jianxin Zhou
Esophageal pressure monitoring provides a minimally invasive method to assess the pleural pressure, which can be used to differentiate the lung and chest wall mechanics. The information of transpulmonary pressure, work of breathing, intrinsic positive end-expiratory pressure and respiratory muscle performance can facilitate the proper setting of mechanical ventilation. Esophageal pressure monitoring is still not routinely used in the clinical setting because of difficulty in esophageal balloon catheter placement and data interpretation due to esophageal pressure monitoring has certain technical requirements, and the measurement results are influenced by many factors such as airbag volume, location, esophageal wall elasticity and mediastinal organ weight...
March 2018: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/29444644/use-of-esophageal-balloon-pressure-volume-curve-analysis-to-determine-esophageal-wall-elastance-and-calibrate-raw-esophageal-pressure-a-bench-experiment-and-clinical-study
#2
Xiu-Mei Sun, Guang-Qiang Chen, Hua-Wei Huang, Xuan He, Yan-Lin Yang, Zhong-Hua Shi, Ming Xu, Jian-Xin Zhou
BACKGROUND: Accurate measurement of esophageal pressure (Pes) depends on proper filling of the balloon. Esophageal wall elastance (Ees) may also influence the measurement. We examined the estimation of balloon-surrounding elastance in a bench model and investigated a simplified calibrating procedure of Pes in a balloon with relatively small volume. METHODS: The Cooper balloon catheter (geometric volume of 2.8 ml) was used in the present study. The balloon was progressively inflated in different gas-tight glass chambers with different inner volumes...
February 14, 2018: BMC Anesthesiology
https://www.readbyqxmd.com/read/29424007/inspiratory-muscle-training-improves-exercise-capacity-with-thoracic-load-carriage
#3
Ren-Jay Shei, Robert F Chapman, Allison H Gruber, Timothy D Mickleborough
Thoracic load carriage (LC) exercise impairs exercise performance compared to unloaded exercise, partially due to impaired respiratory mechanics. We investigated the effects of LC on exercise and diaphragmatic fatigue in a constant-load exercise task; and whether inspiratory muscle training (IMT) improved exercise capacity and diaphragmatic fatigue with LC. Twelve recreationally active males completed three separate running trials to exhaustion (Tlim ) at a fixed speed eliciting 70% of their V˙O2max . The first two trials were completed either unloaded (UL) or while carrying a 10 kg backpack (LC)...
February 2018: Physiological Reports
https://www.readbyqxmd.com/read/29151413/-effects-of-mechanical-ventilation-on-diaphragmatic-contractile-function-in-patients-with-aecopd
#4
Feifei Wang, Xiaoping Zhu, Changjing Zhang, Hui Zhu, Yu Feng, Yang Liu, Shaolin Ma
OBJECTIVE: To study diaphragmatic strength in patients with acute exacerbation of chronic obstructive pulmonary disease (AECOPD) during mechanical ventilation (MV), and to explore the predictive value of maximal transdiaphragm pressure (Pdi max) for successful extubation. METHODS: A prospective study was conducted. Twenty-one patients with AECOPD receiving MV admitted to intensive care unit (ICU) of Shanghai East Hospital of Tongji University of School Medicine from February 2015 to May 2017 were enrolled...
November 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/29089460/measurements-obtained-from-esophageal-balloon-catheters-are-affected-by-the-esophageal-balloon-filling-volume-in-children-with-ards
#5
Justin C Hotz, Cary T Sodetani, Jeffrey Van Steenbergen, Robinder G Khemani, Timothy W Deakers, Christopher J Newth
BACKGROUND: Esophageal balloon inflation volume may affect the accuracy of transpulmo-nary pressure estimates in adults, but the effect is unknown in pediatrics. Using a combination bench and human study, we sought to determine a range of optimal filling volumes for esophageal balloon catheters and to derive a technique to inflate catheters to yield the most accurate estimates of pleural pressure. METHODS: In the laboratory study, we evaluated 4 pediatric and adult esophageal balloon catheters, a liquid-filled catheter, and a micro-tip catheter, both with and without a model esophagus...
February 2018: Respiratory Care
https://www.readbyqxmd.com/read/29066585/use-of-cardiac-cycle-locating-to-minimize-the-influence-of-cardiac-artifacts-on-esophageal-pressure-measurement-during-dynamic-occlusion-test
#6
Xuan He, Xiu-Mei Sun, Guang-Qiang Chen, Yan-Lin Yang, Zhong-Hua Shi, Ming Xu, Jian-Xin Zhou
BACKGROUND: The dynamic occlusion test is used to guide balloon catheter placement during esophageal pressure (Pes ) monitoring. We introduced a cardiac cycle locating method to attenuate the influence of cardiac artifacts on Pes measurement. The aim was to provide a reliable analytic algorithm for the occlusion test. METHODS: Esophageal balloon catheters were placed in subjects receiving pressure support ventilation. During balloon position adjustment, end-expiratory occlusion was performed to induce 3 consecutive inspiratory efforts...
February 2018: Respiratory Care
https://www.readbyqxmd.com/read/28936952/-application-of-injection-test-in-confirming-the-ideal-position-of-esophageal-balloon-catheter
#7
Han Chen, Ming Xu, Yanlin Yang, Xuan He, Jianxin Zhou
OBJECTIVE: To evaluate the safety and feasibility of injection test which is used to locate esophageal balloon catheter. METHODS: A prospective study was conducted. The patients undergoing invasive mechanical ventilation (MV) admitted to general intensive care unit (ICU) of Beijing Tiantan Hospital Affiliated to Capital Medical University from May 2015 and March 2017 were enrolled. The commercially available esophageal balloon catheter was modified to perform injection test...
September 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28828360/transpulmonary-pressure-importance-and-limits
#8
REVIEW
Domenico Luca Grieco, Lu Chen, Laurent Brochard
Transpulmonary pressure (P L ) is computed as the difference between airway pressure and pleural pressure and separates the pressure delivered to the lung from the one acting on chest wall and abdomen. Pleural pressure is measured as esophageal pressure (P ES ) through dedicated catheters provided with esophageal balloons. We discuss the role of P L in assessing the effects of mechanical ventilation in patients with acute respiratory distress syndrome (ARDS). In the supine position, directly measured P L represents the pressure acting on the alveoli and airways...
July 2017: Annals of Translational Medicine
https://www.readbyqxmd.com/read/28770541/optimal-esophageal-balloon-volume-for-accurate-estimation-of-pleural-pressure-at-end-expiration-and-end-inspiration-an-in-vitro-bench-experiment
#9
Yan-Lin Yang, Xuan He, Xiu-Mei Sun, Han Chen, Zhong-Hua Shi, Ming Xu, Guang-Qiang Chen, Jian-Xin Zhou
BACKGROUND: Esophageal pressure, used as a surrogate for pleural pressure, is commonly measured by air-filled balloon, and the accuracy of measurement depends on the proper balloon volume. It has been found that larger filling volume is required at higher surrounding pressure. In the present study, we determined the balloon pressure-volume relationship in a bench model simulating the pleural cavity during controlled ventilation. The aim was to confirm whether an optimal balloon volume range existed that could provide accurate measurement at both end-expiration and end-inspiration...
December 2017: Intensive Care Medicine Experimental
https://www.readbyqxmd.com/read/28572979/complex-effects-of-high-flow-nasal-cannula-therapy-on-hemodynamics-in-the-pediatric-patient-after-cardiac-surgery
#10
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/28441053/evaluation-of-oxygen-administration-with-a-high-flow-nasal-cannula-to-clinically-normal-dogs
#11
Jennifer L Daly, Christine L Guenther, Jamie M Haggerty, Iain Keir
OBJECTIVE To evaluate the safety and efficacy of oxygen administration by use of a high-flow nasal cannula (HFNC) in sedated clinically normal dogs. ANIMALS 6 healthy adult dogs undergoing routine dental prophylaxis. PROCEDURES Dogs were sedated with butorphanol tartrate and dexmedetomidine. An esophageal balloon catheter was inserted into the esophagus, a double-pronged nasal cannula was inserted into the nares, and a catheter was inserted into the dorsal pedal artery. Dogs were positioned in right lateral recumbency...
May 2017: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/28375475/consistency-and-effect-of-body-position-change-on-measurement-of-upper-and-lower-esophageal-sphincter-geometry-using-impedance-planimetry-in-a-canine-model
#12
K A Pitt, P D Mayhew, L Barter, R Pollard, P H Kass, S L Marks
The EndoFLIP (Endolumenal Functional Lumen Imaging Probe, Crospon Inc, Galway, Ireland) device uses the technique of impedance planimetry to evaluate dimensions and distensibility of the upper and lower esophageal sphincter. The null hypotheses for this study were that EndoFLIP variables would be stable between anesthestic episodes and would not be affected by body position when evaluating the upper and lower esophageal sphincters in healthy dogs. During each of three consecutive general anesthesia episodes administered to eight healthy adult research colony dogs with a standardized protocol, the EndoFLIP catheter was positioned to measure cross-sectional area, intrabag pressure, upper and lower esophageal sphincter length at two different balloon fill volumes (30 and 40 mL) and two body positions (lateral and dorsal recumbency)...
April 1, 2017: Diseases of the Esophagus: Official Journal of the International Society for Diseases of the Esophagus
https://www.readbyqxmd.com/read/28226350/-value-of-endoscopy-application-in-the-management-of-complications-after-radical-gastrectomy-for-gastric-cancer
#13
Yiqun Zhang, Pinghong Zhou
Endoscopy plays an important role in the diagnosis and treatment of postoperative complications of gastric cancer. Endoscopic intervention can avoid the second operation and has attracted wide attention. Early gastric anastomotic bleeding after gastrectomy is the most common. With the development of technology, emergency endoscopy and endoscopic hemostasis provide a new treatment approach. According to the specific circumstances, endoscopists can choose metal clamp to stop bleeding, electrocoagulation hemostasis, local injection of epinephrine or sclerotherapy agents, and spraying specific hemostatic agents...
February 25, 2017: Zhonghua Wei Chang Wai Ke za Zhi, Chinese Journal of Gastrointestinal Surgery
https://www.readbyqxmd.com/read/27729399/stability-and-agreement-of-a-microtransducer-and-an-air-filled-balloon-esophageal-catheter-in-the-monitoring-of-esophageal-pressure
#14
COMPARATIVE STUDY
Renan Maloni Augusto, André Luis Pereira Albuquerque, Thomas Jaeger, Carlos Roberto Ribeiro de Carvalho, Pedro Caruso
BACKGROUND: The use of esophageal catheters with microtransducer promises advantages over traditional catheters with air-filled balloons. However, performance comparisons between these 2 types of catheters are scarce and incomplete. METHODS: A catheter with a 9.5-cm air-filled balloon at the distal tip and a catheter with a microtransducer mounted within a flexible silicone rubber were tested in vitro and in vivo. In vitro, the response times of both catheters were compared, and the drift of the baseline pressure of the microtransducer catheter was evaluated over a 6-h period...
February 2017: Respiratory Care
https://www.readbyqxmd.com/read/27636673/measurement-of-pleural-pressure-swings-with-a-fluid-filled-esophageal-catheter-vs-pulmonary-artery-occlusion-pressure
#15
COMPARATIVE STUDY
S Verscheure, P B Massion, S Gottfried, P Goldberg, L Samy, P Damas, S Magder
PURPOSE: Pleural pressure measured with esophageal balloon catheters (Peso) can guide ventilator management and help with the interpretation of hemodynamic measurements, but these catheters are not readily available or easy to use. We tested the utility of an inexpensive, fluid-filled esophageal catheter (Peso) by comparing respiratory-induced changes in pulmonary artery occlusion (Ppao), central venous (CVP), and Peso pressures. METHODS: We studied 30 patients undergoing elective cardiac surgery who had pulmonary artery and esophageal catheters in place...
February 2017: Journal of Critical Care
https://www.readbyqxmd.com/read/27577052/effect-of-high-frequency-oscillatory-ventilation-on-esophageal-and-transpulmonary-pressures-in-moderate-to-severe-acute-respiratory-distress-syndrome
#16
Christophe Guervilly, Jean-Marie Forel, Sami Hraiech, Antoine Roch, Daniel Talmor, Laurent Papazian
BACKGROUND: High-frequency oscillatory ventilation (HFOV) has not been shown to be beneficial in the management of moderate-to-severe acute respiratory distress syndrome (ARDS). There is uncertainty about the actual pressure applied into the lung during HFOV. We therefore performed a study to compare the transpulmonary pressure (P L) during conventional mechanical ventilation (CMV) and different levels of mean airway pressure (mPaw) during HFOV. METHODS: This is a prospective randomized crossover study in a university teaching hospital...
December 2016: Annals of Intensive Care
https://www.readbyqxmd.com/read/27003998/comparison-of-hepatic-venous-pressure-gradient-and-endoscopic-grading-of-esophageal-varices
#17
COMPARATIVE STUDY
EunJi Lee, Yong Jae Kim, Dong Erk Goo, Seung Boo Yang, Hyun-Joo Kim, Jae Young Jang, Soung Won Jeong
AIM: To determine the correlation between the hepatic venous pressure gradient and the endoscopic grade of esophageal varices. METHODS: From September 2009 to March 2013, a total of 176 measurements of hepatic venous pressure gradient (HVPG) were done in 146 patients. Each transjugular HVPG was measured twice, first using an end whole catheter (EH-HVPG), and then using a balloon catheter (B-HVPG). The HVPG was compared with the endoscopic grade of esophageal varices (according to the general rules for recording endoscopic findings of esophagogastric varices), which was recorded within a month of the measurement of HVPG...
March 21, 2016: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/26868503/the-occlusion-tests-and-end-expiratory-esophageal-pressure-measurements-and-comparison-in-controlled-and-assisted-ventilation
#18
Davide Chiumello, Dario Consonni, Silvia Coppola, Sara Froio, Francesco Crimella, Andrea Colombo
BACKGROUND: Esophageal pressure is used as a reliable surrogate of the pleural pressure. It is conventionally measured by an esophageal balloon placed in the lower part of the esophagus. To validate the correct position of the balloon, a positive pressure occlusion test by compressing the thorax during an end-expiratory pause or a Baydur test obtained by occluding the airway during an inspiratory effort is used. An acceptable catheter position is defined when the ratio between the changes in esophageal and airway pressure (∆Pes/∆Paw) is close to unity...
December 2016: Annals of Intensive Care
https://www.readbyqxmd.com/read/26462086/pressurized-intraluminal-aerosol-chemotherapy-with-dbait-in-the-distal-esophagus-of-swine
#19
Nadja Khalili-Harbi, Nirmitha Herath, Wiebke Solass, Urs Giger-Pabst, Marie Dutreix, Marc Andre Reymond
BACKGROUND AND STUDY AIMS: A novel therapeutic concept, pressurized intraluminal aerosol chemotherapy (PILAC), and a corresponding device for distributing drugs to the mucosa and submucosa of the distal esophagus are presented. MATERIALS AND METHODS: The endoscopic device that was designed consisted of (i) a double-balloon catheter, similar to a Sengstaken-Blakemore tube; (ii) a carbon dioxide (CO2) line, used to create a gaseous, pressurized environment; and (iii) a micropump, used to generate a therapeutic aerosol...
February 2016: Endoscopy
https://www.readbyqxmd.com/read/26077619/response-characteristics-of-esophageal-balloon-catheters-handmade-using-latex-and-nonlatex-materials
#20
Troy J Cross, Sophie Lalande, Robert E Hyatt, Bruce D Johnson
The measurement of esophageal pressure allows for the calculation of several important and clinically useful parameters of respiratory mechanics. Esophageal pressure is often measured with balloon-tipped catheters. These catheters may be handmade from natural latex condoms and polyethylene tubing. Given the potential of natural latex to cause allergic reaction, it is important to determine whether esophageal catheter balloons can be fabricated, by hand, using nonlatex condoms as construction materials. To determine the static and dynamic response characteristics of esophageal balloon catheters handmade from latex and nonlatex materials, six esophageal catheter balloons were constructed from each of the following condom materials: natural latex, synthetic polyisoprene, and polyurethane (18 total)...
June 2015: Physiological Reports
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