Pneumological Department, Hospital Ramón y Cajal de Madrid, Madrid, Spain.
Respir Care. 2011 Dec;56(12):1950-2. doi: 10.4187/respcare.01004. Epub 2011 Jun 17.
An increasing number of patients, mainly COPD and overlap-syndrome patients, simultaneously use home oxygen therapy and noninvasive ventilation (NIV) at night. Usually the oxygen source is a stationary concentrator. We report a patient who, without a medical recommendation, was using a portable oxygen concentrator during nocturnal NIV. In the laboratory, with the patient, we tested the portable oxygen concentrator's triggering and oxygen delivery, with the supplemental oxygen connected at 3 different positions: near the ventilator, near the exhalation valve, and on the nasal mask port. We also tested the concentrator's triggering capacity by placing the nasal prongs and the nasal mask independently. We tested ventilator inspiratory pressures of 10, 14, and 18 cm H(2)O, and expiratory pressures of 4 and 6 cm H(2)O. The portable oxygen concentrator did not detect the patient's inspiratory effort or deliver the required oxygen flow at any of the tested settings. We recommended that the patient not use the portable oxygen concentrator during nocturnal NIV.
越来越多的患者，主要是 COPD 和重叠综合征患者，同时在夜间使用家庭氧疗和无创通气（NIV）。通常，氧气源是固定式浓缩器。我们报告了一名患者在夜间 NIV 期间未经医学推荐使用便携式氧气浓缩器的情况。在实验室中，我们在患者身上测试了便携式氧气浓缩器的触发和氧气输送功能，将补充氧气连接到呼吸机、呼气阀和鼻罩端口的 3 个不同位置。我们还通过将鼻叉和鼻罩独立放置来测试浓缩器的触发能力。我们测试了呼吸机吸气压力为 10、14 和 18 cm H2O，呼气压力为 4 和 6 cm H2O。在任何测试设置下，便携式氧气浓缩器均无法检测到患者的吸气努力或输送所需的氧气流量。我们建议患者在夜间 NIV 期间不要使用便携式氧气浓缩器。
