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Influence of Leakage from Non-Invasive Positive Pressure Ventilation Mask on FiO<sub>2</sub>Value Delivered by Home Oxygen Therapy Concentrator: A Bench Study on Simulating Patients with Chronic Obstructive Pulmonary Disease

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Health 2018年第7期10卷 919-927页

作者： Kazuto doi Mitsuhiro Nishitani mayumi doi Yukoh Yaegashi Masaru Ando Junichi Kadota Department of Pathophysiology Faculty of Medicine Oita University Oita Japan Department of Medical Engineering Faculty of Allied Health Sciences University of East Asia Yamaguchi Japan Daimon Clinic for Internal Medicine Nephrology and Dialysis Ishikawa Japan Department of Clinical Pharmacology & Therapeutics Faculty of Medicine Oita University Oita Japan Department of Medical Engineering Faculty of Health Sciences Junshin Gakuen University Fukuoka Japan Department of Respiratory Medicine & Infectious Diseases Faculty of Medicine Oita University Oita Japan

Introduction: During the application of non-invasive positive pressure ventilation (NPPV) therapy in home mechanical ventilation (HMV), leaks in the NPPV mask may occur owing to the position of the mask due to conditions such as skin disorders. Methods: To investigate whether such a leak affects FiO2 supplied to the alveoli, we simulated a patient with chronic obstructive pulmonary disorder during NPPV in HMV. In addition, FiO2 was measured in the portion assumed to be the mouth and lungs while setting the flow of the oxygen concentrator and leak amount based on a previous study. Results: FiO2 supplied to the lungs increased statistically significantly upon increasing the amount of leak (P Conclusions: We observed that FiO2 supplied to alveoli can be reduced by a leak in the NPPV mask. Because our results differ from those previously reported, we believe that further studies should reassess the selection of respirators and oxygen concentrators.

关键词： Mask Oxygen Ventilation Positive-Pressure Ventilation Chronic Obstructive Pulmonary Disorder

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Angle Effect to Dropping of Dew in Closed Suction Catheters

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Health 2018年第6期10卷 719-729页

作者： Kazuto doi mayumi doi Yukoh Yaegashi Katsuhisa Imoto Masaru Ando Junichi Kadota Department of Pathophysiology Faculty of Medicine Oita University Oita Japan Department of Clinical Pharmacology & Therapeutics Faculty of Medicine Oita University Oita Japan Department of Medical Engineering Faculty of Health Sciences Junshin Gakuen University Fukuoka Japan Department of Respiratory Medicine & Infectious diseases Faculty of Medicine Oita University Oita Japan

Intratracheal aspiration in a patient on ventilation is generally performed using a catheter. Of late, closed suction systems have been used more frequently than open systems. To remove tracheal secretions through the intratracheal tube, catheter suction is used, and the suction catheter may be of the closed- or open-type. The catheters are cleaned by flushing with sterile 0.9% saline, resulting in dropping of dew. This phenomenon is caused by some factors: influence of flow, clogging of the suction tube, problem of manipulation of flushing and angle between the intubation tube and the connection port. But this dropping has not yet been investigated. In this study, we focused at this angle and we used the test lung which is simulated machine on behalf of patient. We consider two situations adult and child, also two types of catheters Eco-Cath and Ty-care. In child case we consider elbow-type suction catheters and Y-connector type. The angle was set at 0°, 20°, 40°, 60°, and 90°, and we observed the difference between Eco-Cath and Ty-care. In adults difference is significant (p 0.001), In 90°between Tracheal intubation and Tracheotomy (p ≈ 0.26). In child difference is significant (p 0.001), In 90°between Tracheal intubation and Tracheotomy (p ≈ 0.15). In child case we observed dependency of angle on various conditions too. The relation of the angle and dew was clarified.

关键词： Catheters Intratracheal Intubation Respiration Suction Tracheostomy Ventilators

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