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Heated humidification

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https://www.readbyqxmd.com/read/28813621/improvement-of-an-in-vitro-model-to-assess-delivered-dose-and-particle-size-for-a-vibrating-mesh-nebulizer-during-mechanical-ventilation
#1
Nani Kadrichu, Derek Daniher
BACKGROUND: In an in vitro model of mechanical ventilation with gravity-dependent filter position we observed artificially high delivered doses resulting from liquid droplet collection and precipitation of aerosolized drug. We sequentially modified the model to obtain accurate reproducible measurements of delivered dose and particle size at endotracheal tube exit. METHODS: Stepwise changes in the model included (1) altering the endotracheal tube position to a gravity-independent position, (2) adding fluid traps, (3) humidifying air near the test lung, and (4) simplifying test lung and filters...
August 16, 2017: Journal of Aerosol Medicine and Pulmonary Drug Delivery
https://www.readbyqxmd.com/read/28741229/inhaled-antimicrobials-for-ventilator-associated-pneumonia-practical-aspects
#2
Garyphallia Poulakou, Dimitrios K Matthaiou, David P Nicolau, Georgios Siakallis, George Dimopoulos
Positive experience with inhaled antibiotics in pulmonary infections of patients with cystic fibrosis has paved the way for their utilization in mechanically ventilated, critically ill patients with lower respiratory tract infections. A successful antibiotic delivery depends upon the size of the generated particle and the elimination of drug impaction in the large airways and the ventilator circuit. Generated droplet size is mainly affected by the type of the nebulizer employed. Currently, jet, ultrasonic, and vibrating mesh nebulizers are marketed; the latter can deliver optimal antibiotic particle size...
July 24, 2017: Drugs
https://www.readbyqxmd.com/read/28661666/a-fine-tuned-metal-organic-framework-for-autonomous-indoor-moisture-control
#3
Rasha G AbdulHalim, Prashant M Bhatt, Youssef Belmabkhout, Aleksander Shkurenko, Karim Adil, Leonard J Barbour, Mohamed Eddaoudi
Conventional adsorbents, namely zeolites and silica gel, are often used to control humidity by adsorbing water; however, adsorbents capable of the dual functionality of humidification and dehumidification, offering the desired control of the moisture level at room temperature, have yet to be explored. Here we report Y-shp-MOF-5, a hybrid microporous highly connected rare-earth-based metal-organic framework (MOF), with dual functionality for moisture control within the recommended range of relative humidity (45%-65% RH) set by the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE)...
July 28, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28640124/comparison-of-the-temperature-and-humidity-in-the-anesthetic-breathing-circuit-among-different-anesthetic-workstations-updated-guidelines-for-reporting-parallel-group-randomized-trials
#4
RANDOMIZED CONTROLLED TRIAL
Yoon Ji Choi, Sam Hong Min, Jeong Jun Park, Jang Eun Cho, Seung Zhoo Yoon, Suk Min Yoon
BACKGROUND: For patients undergoing general anesthesia, adequate warming and humidification of the inspired gases is very important. The aim of this study was to evaluate the differences in the heat and moisture content of the inspired gases with low-flow anesthesia using 4 different anesthesia machines. METHODS: The patients were divided into 11 groups according to the anesthesia machine used (Ohmeda, Excel; Avance; Dräger, Cato; and Primus) and the fresh gas flow (FGF) rate (0...
June 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28463044/aerosol-delivery-with-two-nebulizers-through-high-flow-nasal-cannula-a-randomized-cross-over-single-photon-emission-computed-tomography-computed-tomography-study
#5
Jonathan Dugernier, Michel Hesse, Thibaud Jumetz, Emilie Bialais, Jean Roeseler, Virginie Depoortere, Jean-Bernard Michotte, Xavier Wittebole, Stephan Ehrmann, Pierre-François Laterre, François Jamar, Gregory Reychler
BACKGROUND: High-flow nasal cannula use is developing in ICUs. The aim of this study was to compare aerosol efficiency by using two nebulizers through a high-flow nasal cannula: the most commonly used jet nebulizer (JN) and a more efficient vibrating-mesh nebulizer (VN). METHODS: Aerosol delivery of diethylenetriaminepentaacetic acid labeled with technetium-99m (4 mCi/4 mL) to the lungs by using a VN (Aerogen Solo(®); Aerogen Ltd., Galway, Ireland) and a constant-output JN (Opti-Mist Plus Nebulizer(®); ConvaTec, Bridgewater, NJ) through a high-flow nasal cannula (Optiflow(®); Fisher & Paykel, New Zealand) was compared in six healthy subjects...
May 2, 2017: Journal of Aerosol Medicine and Pulmonary Drug Delivery
https://www.readbyqxmd.com/read/28368339/fiber-bragg-grating-measuring-system-for-simultaneous-monitoring-of-temperature-and-humidity-in-mechanical-ventilation
#6
Carlo Massaroni, Michele A Caponero, Rosaria D'Amato, Daniela Lo Presti, Emiliano Schena
During mechanical ventilation, the humidification of the dry air delivered by the mechanical ventilator is recommended. Among several solutions, heated wire humidifiers (HWHs) have gained large acceptance to be used in this field. The aim of this work is to fabricate a measuring system based on fiber Bragg grating (FBG) for the simultaneous monitoring of gas relative humidity (RH) and temperature, intended to be used for providing feedback to the HWHs' control. This solution can be implemented using an array of two FBGs having a different center wavelength...
April 2, 2017: Sensors
https://www.readbyqxmd.com/read/28333157/consensus-approach-to-nasal-high-flow-therapy-in-neonates
#7
B A Yoder, B Manley, C Collins, K Ives, A Kugelman, A Lavizzari, M McQueen
OBJECTIVE: Nasal high-flow therapy (nHFT) is commonly used for noninvasive respiratory support in the neonatal intensive care unit. Our objective was to determine which aspects of neonatal nHFT have achieved adequate evidence base to support consensus among experienced clinical investigators, and to document areas lacking consensus to promote future investigations. STUDY DESIGN: Prospective, modified Delphi collation of tabular queries related to specific aspects of neonatal nHFT...
March 23, 2017: Journal of Perinatology: Official Journal of the California Perinatal Association
https://www.readbyqxmd.com/read/28174331/humidity-and-inspired-oxygen-concentration-during-high-flow-nasal-cannula-therapy-in-neonatal-and-infant-lung-models
#8
Yusuke Chikata, Saki Ohnishi, Masaji Nishimura
BACKGROUND: High-flow nasal cannula therapy (HFNC) for neonate/infants can deliver up to 10 L/min of heated and humidified gas, and FIO2 can be adjusted to between 0.21 and 1.0. With adults, humidification and actual FIO2 are known to vary according to inspiratory and HFNC gas flow, tidal volume (VT), and ambient temperature. There have been few studies focused on humidification and FIO2 in HFNC settings for neonates/infants, so we performed a bench study to investigate the influence of gas flow, ambient temperature, and respiratory parameters on humidification and actual FIO2 in a neonate/infant simulation...
May 2017: Respiratory Care
https://www.readbyqxmd.com/read/28105665/humidification-and-heating-of-inspired-gas-during-delivery-room-stabilization-improves-admission-temperature-in-preterm-infants
#9
Hesham Abdel-Hady
No abstract text is available yet for this article.
April 2017: Acta Paediatrica
https://www.readbyqxmd.com/read/28043780/influence-of-mouth-opening-on-oropharyngeal-humidification-and-temperature-in-a-bench-model-of-neonatal-continuous-positive-airway-pressure
#10
Hendrik S Fischer, Tim L Ullrich, Christoph Bührer, Christoph Czernik, Gerd Schmalisch
Clinical studies show that non-invasive respiratory support by continuous positive airway pressure (CPAP) affects gas conditioning in the upper airways, especially in the presence of mouth leaks. Using a new bench model of neonatal CPAP, we investigated the influence of mouth opening on oropharyngeal temperature and humidity. The model features the insertion of a heated humidifier between an active model lung and an oropharyngeal head model to simulate the recurrent expiration of heated, humidified air. During unsupported breathing, physiological temperature and humidity were attained inside the model oropharynx, and mouth opening had no significant effect on oropharyngeal temperature and humidity...
February 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/27760282/heated-insufflation-with-or-without-humidification-for-laparoscopic-abdominal-surgery
#11
REVIEW
Daniel W Birch, Jerry T Dang, Noah J Switzer, Namdar Manouchehri, Xinzhe Shi, Ghassan Hadi, Shahzeer Karmali
BACKGROUND: Intraoperative hypothermia during both open and laparoscopic abdominal surgery may be associated with adverse events. For laparoscopic abdominal surgery, the use of heated insufflation systems for establishing pneumoperitoneum has been described to prevent hypothermia. Humidification of the insufflated gas is also possible. Past studies on heated insufflation have shown inconclusive results with regards to maintenance of core temperature and reduction of postoperative pain and recovery times...
October 19, 2016: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/27587870/effect-of-heated-humidification-on-adherence-to-continuous-positive-airway-pressure-therapy-in-subjects-with-obstructive-sleep-apnea-and-nasopharyngeal-symptoms
#12
EDITORIAL
https://www.readbyqxmd.com/read/27389086/heat-and-moisture-exchanger-use-reduces-in-hospital-complications-following-total-laryngectomy-a-case-control-study
#13
A Foreman, R J De Santis, F Sultanov, D J Enepekides, K M Higgins
BACKGROUND: Total laryngectomy (TL) is an appropriate oncologic operation for many patients with laryngeal cancer delivering excellent oncologic outcomes, however it remains beset with significant functional consequences. Following TL, the upper and lower airways are permanently disconnected, which causes unfiltered, cold air with reduced humidity to enter the tracheobronchial tree, resulting in mucus overproduction and an increase in the viscosity of the mucus. In response to this, Heat and moisture exchangers were developed to compensate for the lost functions of the upper respiratory tract and their effect on the patients' respiratory performance in addition to their quality of life...
July 7, 2016: Journal of Otolaryngology—Head & Neck Surgery
https://www.readbyqxmd.com/read/27220350/effect-of-heated-humidification-on-cpap-therapy-adherence-in-subjects-with-obstructive-sleep-apnea-with-nasopharyngeal-symptoms
#14
Chuleekorn Soudorn, Dittapol Muntham, Sirimon Reutrakul, Naricha Chirakalwasan
BACKGROUND: The addition of heated humidification to CPAP has been shown to improve nasal adverse effects in subjects with obstructive sleep apnea (OSA). However, current data regarding improvement in CPAP adherence is conflicting. Furthermore, there are no data from a tropical climate area with a high humidity level. METHODS: In this prospective randomized crossover study conducted in Thailand, subjects with moderate to severe OSA with nasopharyngeal symptoms post-split-night study were enrolled in the study...
September 2016: Respiratory Care
https://www.readbyqxmd.com/read/27165673/impact-of-middle-versus-inferior-total-turbinectomy-on-nasal-aerodynamics
#15
Anupriya Dayal, John S Rhee, Guilherme J M Garcia
OBJECTIVES: This computational study aims to (1) use virtual surgery to theoretically investigate the maximum possible change in nasal aerodynamics after turbinate surgery, (2) quantify the relative contributions of the middle and inferior turbinates to nasal resistance and air conditioning, and (3) quantify to what extent total turbinectomy impairs the nasal air-conditioning capacity. STUDY DESIGN: Virtual surgery and computational fluid dynamics. SETTING: Academic tertiary medical center...
September 2016: Otolaryngology—Head and Neck Surgery
https://www.readbyqxmd.com/read/27016353/high-flow-nasal-cannula-oxygen-therapy-in-adults-physiological-benefits-indication-clinical-benefits-and-adverse-effects
#16
REVIEW
Masaji Nishimura
High-flow nasal cannula (HFNC) oxygen therapy is carried out using an air/oxygen blender, active humidifier, single heated tube, and nasal cannula. Able to deliver adequately heated and humidified medical gas at flows up to 60 L/min, it is considered to have a number of physiological advantages compared with other standard oxygen therapies, including reduced anatomical dead space, PEEP, constant F(IO2), and good humidification. Although few large randomized clinical trials have been performed, HFNC has been gaining attention as an alternative respiratory support for critically ill patients...
April 2016: Respiratory Care
https://www.readbyqxmd.com/read/26910479/delivery-of-epinephrine-in-the-vapor-phase-for-the-treatment-of-croup
#17
Kitty Leung, Christopher J L Newth, Justin C Hotz, Kevin C O'Brien, James B Fink, Allan L Coates
OBJECTIVES: The Vapotherm system delivers high humidity to the airway of patients by using semipermeable tubules where heated liquid water is in contact with air. The humidified air is conducted to the patient via a heated tube. Preliminary clinical observations in infants with croup suggested that epinephrine added to the water supplying the humidity was delivered successfully in the vapor phase. The purpose of this study was to evaluate the efficiency of the delivery of epinephrine in the vapor phase and to develop the feasibility criteria for a clinical pilot study...
April 2016: Pediatric Critical Care Medicine
https://www.readbyqxmd.com/read/26908921/quantifying-aerosol-delivery-in-simulated-spontaneously-breathing-patients-with-tracheostomy-using-different-humidification-systems-with-or-without-exhaled-humidity
#18
Arzu Ari, Robert Harwood, Meryl Sheard, Maher Mubarak Alquaimi, Bshayer Alhamad, James B Fink
BACKGROUND: Aerosol and humidification therapy are used in long-term airway management of critically ill patients with a tracheostomy. The purpose of this study was to determine delivery efficiency of jet and mesh nebulizers combined with different humidification systems in a model of a spontaneously breathing tracheotomized adult with or without exhaled heated humidity. METHODS: An in vitro model was constructed to simulate a spontaneously breathing adult (tidal volume, 400 mL; breathing frequency, 20 breaths/min; inspiratory-expiratory ratio, 1:2) with a tracheostomy using a teaching manikin attached to a test lung through a collecting filter (Vital Signs Respirgard II)...
May 2016: Respiratory Care
https://www.readbyqxmd.com/read/26727475/effect-of-a-heated-breathing-tube-on-efficacy-adherence-and-side-effects-during-continuous-positive-airway-pressure-therapy-in-obstructive-sleep-apnea
#19
RANDOMIZED CONTROLLED TRIAL
Wolfgang Galetke, Eleonore Nothofer, Christina Priegnitz, Norbert Anduleit, Winfried Randerath
BACKGROUND: Heated breathing tubes were developed to improve heated humidification in continuous positive airway pressure (CPAP) therapy of patients with obstructive sleep apnea syndrome (OSAS). OBJECTIVES: We wanted to investigate the influence of a heated breathing tube on patients' satisfaction with the treatment, the rate of side effects and the adherence to treatment. METHODS: Eighty-eight patients with primarily diagnosed OSAS were treated in a randomized, controlled, single-blind trial for 12 months either with a CPAP system plus conventional heated humidifier or with a CPAP system plus heated humidifier and an integrated heated breathing tube...
2016: Respiration; International Review of Thoracic Diseases
https://www.readbyqxmd.com/read/26647455/inspiratory-tube-condensation-during-high-flow-nasal-cannula-therapy-a-bench-study
#20
Yusuke Chikata, Kazuaki Unai, Masayo Izawa, Nao Okuda, Jun Oto, Masaji Nishimura
BACKGROUND: High-flow nasal cannula (HFNC) therapy provides better humidification than conventional oxygen therapy. To allay loss of vapor as condensation, a servo-controlled heating wire is incorporated in the inspiratory tube, but condensation is not completely avoidable. We investigated factors that might affect condensation: thermal characteristics of the inspiratory tube, HFNC flow, and ambient temperature. METHODS: We evaluated 2 types of HFNC tubes, SLH Flex 22-mm single tube and RT202...
March 2016: Respiratory Care
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