Effects of high-flow nasal cannula in patients with persistent hypercapnia after an acute COPD exacerbation: a prospective pilot study.

BMC Pulm Med · 2020 · PMC6958745 · PMID 31931776

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a positive trendno p-value reported

Although a positive trend of PaCO 2 reduction was observed, no significant differences were found among the trial in all patients.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.