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Effect of transnasal high-flow nasal cannula oxygen therapy and nasal catheter oxygen therapy on patients with acute exacerbation of chronic obstructive pulmonary disease complicated with type Ⅱ respiratory failure#br#
ZHANG Yanxi   SHANG Longmei   RUI Xiaoyan▲
Department of Respiratory, the First People’s Hospital of Chuzhou, Anhui Province, Chuzhou   239000, China
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