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Airway simulation simulator

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https://www.readbyqxmd.com/read/28919404/emergency-in-the-clinic-a-simulation-curriculum-to-improve-outpatient-safety
#1
Eve Espey, Gillian Baty, John Rask, Michelle Chungtuyco, Brenda Pereda, Lawrence Leeman
BACKGROUND: Emergency response skills are essential when events such as seizure, anaphylaxis or hemorrhage occur in the outpatient setting. As services and procedures increasingly move outside the hospital, training to manage complications may improve outcomes. OBJECTIVE: The objective of this study was to evaluate a simulation-based curriculum in outpatient emergency management skills with the outcome measures of graded objective performance and learner self-efficacy...
September 14, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28917963/an-efficient-computational-fluid-particle-dynamics-method-to-predict-deposition-in-a-simplified-approximation-of-the-deep-lung
#2
P G Koullapis, P Hofemeier, J Sznitman, S C Kassinos
High-fidelity simulations of the complete airway tree are still largely beyond current computational capabilities. Towards large-scale simulations of the human lung, the current study introduces a numerical methodology to predict particle deposition in a simplified approximation of the deep lung during a full breathing cycle. The geometrical model employed consists of an idealised bronchial tree that represents generations 10 to 19 of the conducting zone and an heterogeneous acinar model created using a space-filling algorithm...
September 13, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28906592/influence-of-bronchial-diameter-change-on-the-airflow-dynamics-based-on-a-pressure-controlled-ventilation-system
#3
Shuai Ren, Maolin Cai, Yan Shi, Weiqing Xu, Xiaohua Douglas Zhang
Bronchial diameter is a key parameter that affects the respiratory treatment of mechanically ventilated patients. In this paper, to reveal the influence of bronchial diameter on the airflow dynamics of pressure-controlled mechanically ventilated patients, a new respiratory system model is presented which combines multi-generation airways with lungs. Furthermore, experiments and simulation studies to verify the model are performed. Finally, through the simulation study, it can be determined that in airway generations 2 to 7, when the diameter is reduced to half of the original value, the maximum air pressure (maximum air pressure in lungs) decreases by nearly 16%, the maximum flow decreases by nearly 30%, and the total airway pressure loss (sum of each generation pressure drop) is more than 5 times the original value...
September 14, 2017: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/28894833/ethmoidectomy-combined-with-superior-meatus-enlargement-increases-olfactory-airflow
#4
Hironobu Nishijima, Kenji Kondo, Tsutomu Nomura, Tatsuya Yamasoba
OBJECTIVES: The relationship between a particular surgical technique in endoscopic sinus surgery (ESS) and airflow changes in the post-operative olfactory region has not been assessed. The present study aimed to compare olfactory airflow after ESS between conventional ethmoidectomy and ethmoidectomy with superior meatus enlargement, using virtual ESS and computational fluid dynamics (CFD) analysis. STUDY DESIGN: Prospective computational study. MATERIALS AND METHODS: Nasal computed tomography images of four adult subjects were used to generate models of the nasal airway...
August 2017: Laryngoscope Investigative Otolaryngology
https://www.readbyqxmd.com/read/28894819/computational-modelling-of-cough-function-and-airway-penetrant-behavior-in-patients-with-disorders-of-laryngeal-function
#5
Bari Hoffman Ruddy, Don Nadun Kuruppumullage, Giselle Carnaby, Michael Crary, Jeffery Lehman, Olusegun J Ilegbusi
OBJECTIVE/HYPOTHESIS: Patients with laryngeal disorders often exhibit changes to cough function contributing to aspiration episodes. Two primary cough variables (peak cough flow: PCF and compression phase duration: CPD) were examined within a biomechanical model to determine their impact on characteristics that impact airway compromise. STUDY DESIGN: Computational study. METHODS: A Computational Fluid Dynamics (CFD) technique was used to simulate fluid flow within an upper airway model reconstructed from patient CT images...
February 2017: Laryngoscope Investigative Otolaryngology
https://www.readbyqxmd.com/read/28891710/the-use-of-a-thyroid-shield-for-intra-oral-anterior-oblique-occlusal-views-a-risk-based-approach
#6
Mark Worrall, Alison Menhinick, Donald J Thomson
OBJECTIVES: To estimate the radiation dose reduction to the thyroid for an anterior oblique occlusal view from the use of a thyroid shield, compare this to the variation in thyroid dose resulting from differences in examination positioning and discuss the additional considerations associated with the use of a thyroid shield before making a recommendation on their routine use for this examination. METHODS: Doses to the oral mucosa, the salivary glands, the thyroid, the extra-thoracic airways, the oesophagus and the lungs were directly measured for anterior oblique occlusal x-rays of a Rando phantom with and without a thyroid shield using strips of calibrated XRQA Gafchromic film...
September 11, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28890203/regional-aerosol-deposition-in-the-human-airways-the-siminhale-benchmark-case-and-a-critical-assessment-of-in-silico-methods
#7
P Koullapis, S C Kassinos, J Muela, C Perez-Segarra, J Rigola, O Lehmkuhl, Y Cui, M Sommerfeld, J Elcner, M Jicha, I Saveljic, N Filipovic, F Lizal, L Nicolaou
Regional deposition effects are important in the pulmonary delivery of drugs intended for the topical treatment of respiratory ailments. They also play a critical role in the systemic delivery of drugs with limited lung bioavailability. In recent years, significant improvements in the quality of pulmonary imaging have taken place, however the resolution of current imaging modalities remains inadequate for quantifying regional deposition. Computational Fluid-Particle Dynamics (CFPD) can fill this gap by providing detailed information about regional deposition in the extrathoracic and conducting airways...
September 7, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28883723/comparison-of-pulsed-versus-continuous-oxygen-delivery-using-realistic-adult-nasal-airway-replicas
#8
John Z Chen, Ira M Katz, Marine Pichelin, Kaixian Zhu, Georges Caillibotte, Michelle L Noga, Warren H Finlay, Andrew R Martin
BACKGROUND: Portable oxygen concentrators (POCs) typically include pulse flow (PF) modes to conserve oxygen. The primary aims of this study were to develop a predictive in vitro model for inhaled oxygen delivery using a set of realistic airway replicas, and to compare PF for a commercial POC with steady flow (SF) from a compressed oxygen cylinder. METHODS: Experiments were carried out using a stationary compressed oxygen cylinder, a POC, and 15 adult nasal airway replicas based on airway geometries derived from medical images...
2017: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/28881101/nasal-high-frequency-oscillatory-ventilation-impairs-heated-humidification-a-neonatal-bench-study
#9
Tim L Ullrich, Christoph Czernik, Christoph Bührer, Gerd Schmalisch, Hendrik S Fischer
OBJECTIVE: Nasal high-frequency oscillatory ventilation (nHFOV) is a novel mode of non-invasive ventilation used in neonates. However, upper airway obstructions due to viscous secretions have been described as specific adverse effects. We hypothesized that high-frequency oscillations reduce air humidity in the oropharynx, resulting in upper airway desiccation. Therefore, we aimed to investigate the effects of nHFOV ventilatory settings on oropharyngeal gas conditions. METHODS: NHFOV or nasal continuous positive airway pressure (nCPAP) was applied, along with heated humidification, to a previously established neonatal bench model that simulates oropharyngeal gas conditions during spontaneous breathing through an open mouth...
September 7, 2017: Pediatric Pulmonology
https://www.readbyqxmd.com/read/28874304/effect-of-cricoid-pressure-on-the-insertion-efficacy-of-six-supraglottic-devices-a-crossover-randomized-simulation-trial
#10
Fumihiro Ohchi, Nobuyasu Komasawa, Ryosuke Mihara, Kazuo Hattori, Toshiaki Minami
BACKGROUND: No study has ever compared the efficacy of various types of supraglottic devices (SGDs) for securing the airway under cricoid pressure. OBJECTIVE: This study aimed to evaluate the efficacy of six SGDs, LMA-ProSeal (ProSeal), LMA-Classic (Classic), Laryngeal Tube (LT), LMA-Supreme (Supreme), air-Q (air-Q), and i-gel (i-gel), in airway management under cricoid pressure using a manikin. METHODS: Fifteen novice doctors and 16 experienced doctors used the six SGDs under cricoid or sham pressure on an adult manikin...
September 2, 2017: Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28872147/generation-of-a-chronic-obstructive-pulmonary-disease-model-in-mice-by-repeated-ozone-exposure
#11
Zhongwei Sun, Feng Li, Xin Zhou, Wen Wang
Chronic obstructive pulmonary disease (COPD) is characterized by persistent airflow limitation and lung parenchymal destruction. It has a very high incidence in aging populations. The current conventional therapies for COPD focus mainly on symptom-modifying drugs; thus, the development of new therapies is urgently needed. Qualified animal models of COPD could help to characterize the underlying mechanisms and can be used for new drug screening. Current COPD models, such as lipopolysaccharide (LPS) or the porcine pancreatic elastase (PPE)-induced emphysema model, generate COPD-like lesions in the lungs and airways but do not otherwise resemble the pathogenesis of human COPD...
August 25, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28867222/inter-airway-structural-heterogeneity-interacts-with-dynamic-heterogeneity-to-determine-lung-function-and-flow-patterns-in-both-asthmatic-and-control-simulated-lungs
#12
G M Donovan
Asthma is a disease involving both airway remodelling (e.g. thickening of the airway wall) and acute, reversible airway narrowing driven by airway smooth muscle contraction. Both of these processes are known to be heterogeneous, and in this study we consider a new theoretical model which considers the interactions of both mechanisms: structural heterogeneity (variation in airway remodelling) and dynamic heterogeneity (emergent variation in airway narrowing and flow). By integrating both types of inter-airway heterogeneity in a full human lung geometry, we are able to draw several insights regarding the mechanisms underlying observed ventilation heterogeneity...
August 31, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28865707/effect-of-airway-surface-liquid-on-the-forces-on-the-pharyngeal-wall-experimental-fluid-structure-interaction-study
#13
Jernej Pirnar, Brane Širok, Andrej Bombač
Obstructive sleep apnoea syndrome (OSAS) is a breathing disorder with a multifactorial etiology. The respiratory epithelium is lined with a thin layer of airway surface liquid preventing interactions between the airflow and epithelium. The effect of the liquid lining in OSAS pathogenesis remains poorly understood despite clinical research. Previous studies have shown that the physical properties of the airway surface liquid or altered stimulation of the airway mechanoreceptors could alleviate or intensify OSAS; however, these studies do not provide a clear physical interpretation...
August 24, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28863405/phantom-study-evaluating-detection-of-simulated-upper-airway-occlusion-using-piezoelectric-ultrasound-transducers
#14
Mohammad Al-Abed, Peter Antich, Donald E Watenpaugh, Khosrow Behbehani
Obstructive sleep apnea/hypopnea syndrome (OSAHS) is characterized by repetitive narrowing or full collapse of the upper airway concomitant with continued respiratory effort during sleep lasting 10s or more. OSAHS is the most prevalent form of sleep-disordered breathing, affecting more than 17% of the middle-aged U.S. POPULATION: Hence, many individuals need to be tested for having OSAHS. Currently, detection of airway occlusion due to OSAHS is achieved by indirect measurements, often requiring multiple sensor types, such as a flow transducer combined with chest and abdomen plethysmography...
August 24, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28846719/aging-effects-on-airflow-dynamics-and-lung-function-in-human-bronchioles
#15
JongWon Kim, Rebecca L Heise, Angela M Reynolds, Ramana M Pidaparti
BACKGROUND AND OBJECTIVE: The mortality rate for patients requiring mechanical ventilation is about 35% and this rate increases to about 53% for the elderly. In general, with increasing age, the dynamic lung function and respiratory mechanics are compromised, and several experiments are being conducted to estimate these changes and understand the underlying mechanisms to better treat elderly patients. MATERIALS AND METHODS: Human tracheobronchial (G1 ~ G9), bronchioles (G10 ~ G22) and alveolar sacs (G23) geometric models were developed based on reported anatomical dimensions for a 50 and an 80-year-old subject...
2017: PloS One
https://www.readbyqxmd.com/read/28845544/ventilatory-choices-for-intubated-patients-during-helicopter-stretcher-winching
#16
John Hollott
INTRODUCTION: The winching of intubated patients on a stretcher into a helicopter is a rare event. Intermittent positive pressure ventilation is mandatory, which can either be performed manually with a self-inflating bag, or automatically using a portable ventilator. Theoretically automatic ventilation would provide improved oxygenation, more stable arterial carbon dioxide levels and a reduced risk of airway disconnection. Furthermore, the stretcher attendant may better perform winching procedures with higher situational awareness, contributing to crew and patient safety...
August 28, 2017: Emergency Medicine Australasia: EMA
https://www.readbyqxmd.com/read/28843460/safety-threats-during-the-care-of-infants-with-hypoglycemic-seizures-in-the-emergency-department-a-multicenter-simulation-based-prospective-cohort-study
#17
Barbara M Walsh, Sandeep Gangadharan, Travis Whitfill, Marcie Gawel, David Kessler, Robert A Dudas, Jessica Katznelson, Megan Lavoie, Khoon-Yen Tay, Melinda Hamilton, Linda L Brown, Vinay Nadkarni, Marc Auerbach
BACKGROUND: Errors in the timely diagnosis and treatment of infants with hypoglycemic seizures can lead to significant patient harm. It is challenging to precisely measure medical errors that occur during high-stakes/low-frequency events. Simulation can be used to assess risk and identify errors. OBJECTIVE: We hypothesized that general emergency departments (GEDs) would have higher rates of deviations from best practices (errors) compared to pediatric emergency departments (PEDs) when managing an infant with hypoglycemic seizures...
August 23, 2017: Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28842353/experimental-methods-for-flow-and-aerosol-measurements-in-human-airways-and-their-replicas
#18
Frantisek Lizal, Jan Jedelsky, Kaye Morgan, Katrin Bauer, Jordi Llop, Unai Cossio, Stavros Kassinos, Sylvia Verbanck, Jesús Ruiz-Cabello, Arnoldo Santos, Edmund Koch, Christian Schnabel
Recent developments in the prediction of local aerosol deposition in human lungs are driven by the fast development of computational simulations. Although such simulations provide results in unbeatable resolution, significant differences among distinct methods of calculation emphasize the need for highly precise experimental data in order to specify boundary conditions and for validation purposes. This paper reviews and critically evaluates available methods for the measurement of single and disperse two-phase flows for the study of respiratory airflow and deposition of inhaled particles, performed both in vivo and in replicas of airways...
August 22, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28837561/histologic-and-biochemical-alterations-predict-pulmonary-mechanical-dysfunction-in-aging-mice-with-chronic-lung-inflammation
#19
Christopher B Massa, Angela M Groves, Smita U Jaggernauth, Debra L Laskin, Andrew J Gow
Both aging and chronic inflammation produce complex structural and biochemical alterations to the lung known to impact work of breathing. Mice deficient in surfactant protein D (Sftpd) develop progressive age-related lung pathology characterized by tissue destruction/remodeling, accumulation of foamy macrophages and alteration in surfactant composition. This study proposes to relate changes in tissue structure seen in normal aging and in chronic inflammation to altered lung mechanics using a computational model...
August 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28835062/-effects-of-chronic-intermittent-hypoxia-on-left-ventricular-myocardial-contractibility-in-a-rabbit-model-of-obstructive-sleep-apnea
#20
L F Xu, Y F Cai, K Hu, S Tang, X F Zhou, H M Li
Objective: To explore the effects of chronic intermittent hypoxia (CIH) on left ventricular myocardial contractibility in a rabbit model of obstructive sleep apnea (OSA). Methods: Based on random number table, twenty-four rabbits were randomly divided into three groups: operation, sham, and control groups, each with 8 rabbits. The rabbit model for OSA in operation group was established by repeatedly closing the airway and then reopening it. Upper airway obstructions were conducted on rabbits every day, which were alternately closed for 15 s and then reopened for 75 s in a 90 s-long cycle, for 8 h each day over 3 months...
August 22, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
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