One year period prevalence study of respiratory acidosis in acute exacerbations of COPD: implications for the provision of non-invasive ventilation and oxygen administration

• Published in: Thorax Vol. 55; no. 7; pp. 550 - 554
• Main Authors: Plant, P K, Owen, J L, Elliott, M W
• Format: Journal Article
• Language: English
• Published: London BMJ Publishing Group Ltd and British Thoracic Society 01-07-2000; BMJ; BMJ Publishing Group LTD; BMJ Group
• Subjects: Acidosis, Respiratory - complications; Acidosis, Respiratory - epidemiology; Age; Aged; Asthma; Biological and medical sciences; Chronic obstructive pulmonary disease; Confidence intervals; Cross-Sectional Studies; Diseases of the respiratory system; Female; Forecasting; Humans; Intubation; Lung Diseases, Obstructive - complications; Lung Diseases, Obstructive - epidemiology; Lung Diseases, Obstructive - therapy; Male; Medical sciences; Middle Aged; Mortality; Multivariate analysis; non-invasive ventilation; Original; Oxygen; Oxygen Inhalation Therapy - methods; Prevalence; Prospective Studies; Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects); Respiration, Artificial - methods; respiratory insufficiency; Respiratory Insufficiency - etiology; Skills; Studies; United Kingdom - epidemiology; Ventilation; United Kingdom; Europe; United Kingdom > UK; Human; Lung disease; Assisted ventilation; Prevalence; Respiratory disease; Acute; Treatment efficiency; Exploration; Oxygenotherapy; Chronic; Treatment; Non invasive method; Bronchus disease; Complication; Respiratory acidosis; Obstructive pulmonary disease; Aggravation; Public health
• ISSN: 0040-6376; 1468-3296
• DOI: 10.1136/thorax.55.7.550

BACKGROUND Non-invasive ventilation (NIV) reduces mortality and intubation rates in patients with chronic obstructive pulmonary disease (COPD) admitted to hospital with respiratory acidosis. This study aimed to determine the prevalence of respiratory acidosis in patients admitted with COPD, to draw inferences about oxygen therapy, and to determine the need for NIV services for acute COPD in typical UK hospitals. METHODS This one year prospective prevalence study identified patients with COPD aged 45–79 years inclusive who were admitted to Leeds General Infirmary, St James's University, and Killingbeck Hospitals, Leeds between 1 March 1997 and 28 February 1998. The prevalence of respiratory acidosis and the relationship with oxygenation are described. Other outcomes included intensive care use and in hospital mortality. From this data population prevalence estimates were determined for respiratory acidosis, from which the need for NIV in a typical district general hospital was modelled. RESULTS 983 patients were admitted, 11 of whom required immediate intubation. 20% of the remaining 972 had a respiratory acidosis. Acidosis was associated with subsequent admission to the intensive care unit (ICU): pH<7.25, OR 6.10 (95% confidence interval (CI) 1.19 to 31.11); pH 7.25–7.30, OR 8.73 (95% CI 2.11 to 36.06). pH was inversely correlated with arterial oxygen tension (Pao 2) in the 47% of patients who were hypercapnic, with a Pao 2 of >10 kPa being associated with acidosis in most hypercapnic patients. 80% remained acidotic after initial treatment, giving an age/sex specific prevalence for England and Wales of 75 (95% CI 61 to 90)/100 000/year for men aged 45–79 years and 57 (95% CI 46 to 69)/100 000/year for women. Modelling the need for NIV for all COPD patients indicates that a typical UK hospital will admit 90 patients per year with acidosis of which 72 will require NIV. CONCLUSIONS In patients with acute COPD the Pao 2 should be maintained at 7.3–10 kPa (Sao 2 85–92%) to avoid the dangers of hypoxia and acidosis. If all COPD patients with a respiratory acidosis (pH<7.35) after initial treatment are offered NIV, a typical UK hospital will treat 72 patients per year.