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Does long-term oxygen therapy reduce hospitalisation in hypoxaemic chronic obstructive pulmonary disease?

T.J. Ringbaek, K. Viskum, P. Lange
European Respiratory Journal 2002 20: 38-42; DOI: 10.1183/09031936.02.00284202
T.J. Ringbaek
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K. Viskum
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P. Lange
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    Fig. 1.—

    a) Flow chart of patients on long-term oxygen therapy and b) the division of the four groups. COPD: chronic obstructive pulmonary disease; COT: continuous oxygen therapy; NCOT: noncontinuous oxygen therapy; hypoxemic status: oxygen tension in arterial blood <7.3 kPa (50 mmHg) or 7.3–8.0 kPa (50–60 mmHg) together with cor pulmonale according to electrocardiogram, while resting and on room air.

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  • Table 1—

    Characteristics of 246 chronic obstructive pulmonary disease patients according to usage of oxygen continuous oxygen therapy# (COT) versus noncontinuous oxygen therapy¶ (NCOT)

    Subjects nCOT§NCOTƒ
    Age yrs68.4±8.771.6±7.4
    Sex female %56.848.8
    Current smoker %24516.020.5
    Body mass index kg·m−222822.0±6.022.0±4.6
    Had outdoor activity %24266.072.3
    Systemic corticosteroid %24550.944.0
    FEV1 % pred value11429.6±10.730.2±10.9
    Prescribed oxygen flow L·min−11.3±0.61.3±0.7
    Pa,O2, mmHg+6.38±0.76.36±0.9
    Pa,CO2, mmHg+6.78±1.26.49±1.4
    Time spent with oxygen according to the patient h18.5±3.48.2±4.8
    Liquid oxygen %2459.34.8
    Concentrator %24579.679.8
    Mobile oxygen %24549.729.8
    • Data are presented as mean±sd unless otherwise stated

    • FEV1: forced expiratory volume in one second

    • Pa,O2: oxygen tension in arterial blood, COT=48.0 (5.3) mmHg, NCOT=47.8 (7.1) mmHg

    • Pa,CO2: carbon dioxide tension in arterial blood, COT=51.0. (9.0) mmHg, NCOT=48.8 (10.5) mmHg

    • §: n=162

    • ƒ: n=84

    • #: 15–24 h·day−1

    • ¶: <15 h·day−1

    • +: 20 patients had only blood gases measured while on supplemental oxygen

  • Table 2—

    Days spent in hospital and admission rates before and after starting long-term oxygen therapy (LTOT) in two groups of hypoxaemic chronic obstructive pulmonary disease patients depending on compliance with hours spent with oxygen

    VariableSubjects nBefore LTOTAfter LTOTRelative change# %p‐value
    All256
     Days23.7±24.513.4±22.743.5<0.001
     Admission2.1±1.91.6±2.223.8<0.001
     Ever admitted %92.763.831.2<0.001
    COT162
     Days23.1±23.914.2±25.738.5<0.001
     Admission2.2±1.91.6±2.027.3<0.001
     Ever admitted %946333.0<0.001
    NCOT84
     Days24.9±25.711.9±15.352.6<0.001
     Admission2.0±1.71.7±2.615.00.28
     Ever admitted %896527.00.001
    • Data are presented as mean±sd unless otherwise stated

    • COT: continuous oxygen therapy (15–24 h·day−1)

    • NCOT: noncontinuous oxygen therapy (<15 h·day−1)

    • #: (preoxygen period-oxygen period)/preoxygen period

  • Table 3—

    Days spent in hospital and admission rates before and after starting long-term oxygen therapy (LTOT) in two hypoxaemic groups of chronic obstructive pulmonary disease patients, who started oxygen therapy in the outpatient clinic, depending on compliance with hours spent with oxygen

    VariableSubjects nBefore LTOTAfter LTOTRelative change# %p‐value
    COT37
     Days13.8±19.08.4±11.939.10.16
     Admission1.2±1.01.2±1.4−8.30.84
     Ever admitted %765725.00.17
    NCOT26
     Days12.2±19.69.2±9.923.80.46
     Admission1.1±1.61.1±1.101.0
     Ever admitted %65624.61.0
    • Data are presented as mean (sd) unless otherwise stated

    • COT: continuous oxygen therapy (15–24 h·day−1)

    • NCOT: noncontinuous oxygen therapy (<15 h·day−1)

    • #: (preoxygen period-oxygen period)/preoxygen period

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Does long-term oxygen therapy reduce hospitalisation in hypoxaemic chronic obstructive pulmonary disease?
T.J. Ringbaek, K. Viskum, P. Lange
European Respiratory Journal Jul 2002, 20 (1) 38-42; DOI: 10.1183/09031936.02.00284202

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Does long-term oxygen therapy reduce hospitalisation in hypoxaemic chronic obstructive pulmonary disease?
T.J. Ringbaek, K. Viskum, P. Lange
European Respiratory Journal Jul 2002, 20 (1) 38-42; DOI: 10.1183/09031936.02.00284202
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