Low Levels of PaO<sub>2</sub> after Long-term Noninvasive Ventilation are a Poor Prognostic Factor in Patients with Restrictive Thoracic Disease

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  • Chihara Yuichi
    Department of Respiratory Medicine, National Hospital Organization Minami-Kyoto Hospital, Japan
  • Tsuboi Tomomasa
    Department of Respiratory Medicine, National Hospital Organization Minami-Kyoto Hospital, Japan
  • Sumi Kensuke
    Department of Respiratory Medicine, National Hospital Organization Minami-Kyoto Hospital, Japan
  • Sato Atsuo
    Department of Respiratory Medicine, National Hospital Organization Minami-Kyoto Hospital, Japan
  • Oga Toru
    Department of Respiratory Medicine, Kyoto University Graduate School of Medicine, Japan
  • Chin Kazuo
    Departments of Respiratory Care and Sleep Control Medicine, Kyoto University Graduate School of Medicine, Japan

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<p>Objective The effects of partial pressure of arterial oxygen (PaO2) after introducing long-term noninvasive ventilation (NIV) on the prognosis of patients with restrictive thoracic disease and chronic respiratory failure are not exactly known. </p><p>Methods Data from 141 patients with restrictive thoracic disease under long-term nocturnal NIV were retrospectively examined. We divided the patients into 2 groups according to the daytime PaO2 value while breathing spontaneously with prescribed oxygen at 12 months after introducing NIV: PaO2≥80 Torr group (n=76) and PaO2<80 Torr group (n=65). </p><p>Results During the 4-year follow-up, the mortality was significantly higher in the PaO2<80 Torr group than in the PaO2≥80 Torr group (50.8% vs. 32.9%, p=0.03). Independent factors associated with the 4-year mortality after introducing NIV determined by a multivariate logistic regression analysis were a low body mass index [odds ratio (OR) 0.87; 95% confidence interval (CI) 0.77 to 0.97; p=0.01], assisted mode with NIV (OR 4.11; 95% CI, 1.79 to 9.45; p=0.0009), hospitalization during the first year of introducing NIV (OR 1.72; 95% CI, 1.06 to 2.79; p=0.03), and daytime PaO2<80 Torr at 12 months after introducing NIV (OR 2.30; 95% CI, 1.03 to 5.10; p=0.04). </p><p>Conclusion A low daytime PaO2 at 12 months after introducing NIV was an independent risk factor for mortality. Keeping the daytime PaO2≥80 Torr through the adjustment of the nocturnal NIV settings or increased diurnal supplemental oxygen may help improve the prognosis in patients with restrictive thoracic disease who are under NIV. </p>

収録刊行物

  • Internal Medicine

    Internal Medicine 58 (9), 1243-1250, 2019-05-01

    一般社団法人 日本内科学会

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