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Heated humidification

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...
February 7, 2017: Respiratory Care
Hesham Abdel-Hady
No abstract text is available yet for this article.
January 20, 2017: Acta Paediatrica
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...
December 30, 2016: Medical Engineering & Physics
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
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
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
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
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
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
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
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
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
Jörg Lindemann, Michael Reichert, Ralf Kröger, Patrick Schuler, Thomas Hoffmann, Fabian Sommer
Nasal septum perforations (SP) are characterized by nasal obstruction, bleeding and crusting. The disturbed heating and humidification of the inhaled air are important factors, which cause these symptoms due to a disturbed airflow. Numerical simulations offer a great potential to avoid these limitations and to provide valid data. The aim of the study was to simulate the humidification and heating of the inhaled air in digital nose models with three different SPs and without SP. Four realistic bilateral nose models based on a multi-slice CT scan were created...
July 2016: European Archives of Oto-rhino-laryngology
C Y Y Wong, A A Shakir, A Farboud, H B Whittet
OBJECTIVE: To determine whether active or passive humidification methods are more effective in preventing pulmonary complications in self-ventilating neck breather patients. DESIGN: Systematic Review adhering to PRISMA guidance (checklist sourced from SETTING: Review of current published relevant literature at a tertiary department of Otolaryngology and Head & Neck Surgery. PARTICIPANTS: We included all separate studies and comparison studies of active and passive humidification techniques in adult and paediatric neck breather patients...
December 2016: Clinical Otolaryngology
Georg Nilius
No abstract text is available yet for this article.
March 2016: Sleep & Breathing, Schlaf & Atmung
A Ozsancak Ugurlu, A M Esquinas
No abstract text is available yet for this article.
March 2016: Sleep & Breathing, Schlaf & Atmung
Calum T Roberts, Rebecca Kortekaas, Jennifer A Dawson, Brett J Manley, Louise S Owen, Peter G Davis
OBJECTIVE: Heating and humidification of inspired gases is routine during neonatal non-invasive respiratory support. However, little is known about the temperature and humidity delivered to the upper airway. The International Standards Organization (ISO) specifies that for all patients with an artificial airway humidifiers should deliver ≥33 g/m(3) absolute humidity (AH). We assessed the oropharyngeal temperature and humidity during different non-invasive support modes in a neonatal manikin study...
May 2016: Archives of Disease in Childhood. Fetal and Neonatal Edition
F Cerpa, D Cáceres, C Romero-Dapueto, C Giugliano-Jaramillo, R Pérez, H Budini, V Hidalgo, T Gutiérrez, J Molina, J Keymer
The normal physiology of conditioning of inspired gases is altered when the patient requires an artificial airway access and an invasive mechanical ventilation (IMV). The endotracheal tube (ETT) removes the natural mechanisms of filtration, humidification and warming of inspired air. Despite the noninvasive ventilation (NIMV) in the upper airways, humidification of inspired gas may not be optimal mainly due to the high flow that is being created by the leakage compensation, among other aspects. Any moisture and heating deficit is compensated by the large airways of the tracheobronchial tree, these are poorly suited for this task, which alters mucociliary function, quality of secretions, and homeostasis gas exchange system...
2015: Open Respiratory Medicine Journal
Pranas Baltrėnas, Jonas Kleiza, Raimondas Leopoldas Idzelis
The research conducted has involved a laboratory stand of a plate-type air treatment biofilter with a capillary system for humidifying packing material composed of polymer plates vertically arranged next to each other and producing a capillary effect of humidification. The pattern of arranging the plates has sufficiently large spaces (6 mm), and therefore the use of the plate-type structure decreases the aerodynamic resistance of the device. Slightly pressed slabs attached on both sides of the plates are made of heat-treated wood fibre, to increase the longevity of which, wood waste has been heat-treated in the steam explosion reactor under the pressure of 32 bars and a temperature of 235 °C...
2016: Environmental Technology
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