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• W2899056912 abstract "Improvement in hypercapnia does not predict survival in COPD patients on chronic noninvasive ventilation Tim Raveling,1 Gerrie Bladder,2 Judith M Vonk,3,4 Jellie A Nieuwenhuis,2,3 Fransien M Verdonk-Struik,5 Peter J Wijkstra,2,3 Marieke L Duiverman2,3 1Faculty of Medical Sciences, University of Groningen, Groningen, the Netherlands; 2Department of Pulmonary Diseases and Home Mechanical Ventilation, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands; 3Groningen Research Institute of Asthma and COPD (GRIAC), University of Groningen, Groningen, the Netherlands; 4Department of Epidemiology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands; 5Primary Care Group Gelders Rivierenland, Ochten, the Netherlands Purpose: It has recently been shown that chronic noninvasive ventilation (NIV) improves a number of outcomes including survival, in patients with stable hypercapnic COPD. However, the mechanisms responsible for these improved outcomes are still unknown. The aim of the present study was to identify parameters associated with: 1) an improved arterial partial pressure of carbon dioxide (PaCO2) and 2) survival, in a cohort of hypercapnic COPD patients treated with chronic NIV. Patients and methods: Data from 240 COPD patients treated with chronic NIV were analyzed. Predictors for the change in PaCO2 and survival were investigated using multivariate linear and Cox regression models, respectively. Results: A higher level of bicarbonate before NIV initiation, the use of higher inspiratory ventilator pressures, the presence of anxiety symptoms, and NIV initiated following an exacerbation compared to NIV initiated in stable disease were associated with a larger reduction in PaCO2. A higher body mass index, a higher FEV1, a lower bicarbonate before NIV initiation, and younger age and NIV initiation in stable condition were independently associated with better survival. The change in PaCO2 was not associated with survival, neither in a subgroup of patients with a PaCO2 >7.0 kPa before the initiation of NIV. Conclusion: Patients with anxiety symptoms and a high bicarbonate level at NIV initiation are potentially good responders in terms of an improvement in hypercapnia. Also, higher inspiratory ventilator pressures are associated with a larger reduction in PaCO2. However, the improvement in hypercapnia does not seem to be associated with an improved survival and emphasizes the need to look beyond PaCO2 when considering NIV initiation. Keywords: carbon dioxide, home mechanical ventilation, exacerbation, bicarbonate, chronic obstructive pulmonary disease, respiratory insufficiency" @default.
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• W2899056912 date "2018-11-01" @default.
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• W2899056912 title "Improvement in hypercapnia does not predict survival in COPD patients on chronic noninvasive ventilation" @default.
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• W2899056912 doi "https://doi.org/10.2147/copd.s169951" @default.
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