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Thorax 2002;57:1050-1053 doi:10.1136/thorax.57.12.1050
  • Original articles

Ambulatory pulmonary artery pressure monitoring during sleep and exercise in normal individuals and patients with COPD

  1. D A Raeside1,
  2. A Brown3,
  3. K R Patel3,
  4. D Welsh2,
  5. A J Peacock2
  1. 1Monklands District General Hospital, Airdrie ML6 0JS, UK
  2. 2Scottish Pulmonary Vascular Unit, Department of Respiratory Medicine, West Glasgow Hospitals University NHS Trust, Western Infirmary, Glasgow G11 6NT, UK
  3. 3Pulmonary Function Laboratory, Department of Respiratory Medicine, West Glasgow Hospitals University NHS Trust
  1. Correspondence to:
    Dr A J Peacock, Scottish Pulmonary Vascular Unit, Department of Respiratory Medicine, West Glasgow Hospitals University NHS Trust, Western Infirmary, Glasgow G11 6NT, UK;
    apeacock{at}udcf.gla.ac.uk
  • Accepted 20 August 2002
  • Revised 12 August 2002

Abstract

Background: Pulmonary hypertension is a common complication of chronic obstructive airways disease (COPD) and its presence implies a poor prognosis. However, it is difficult to measure and its specific contribution to symptoms is difficult to quantify. A micromanometer tipped pulmonary artery catheter was used to measure pulmonary artery pressure (PAP) during sleep and on exercise.

Methods: Ten patients (five with COPD receiving long term oxygen therapy and five normal individuals) were studied. Pulmonary artery pressure was recorded continuously during two periods of sleep (breathing oxygen followed by air for the COPD group) and during exercise.

Results: In the COPD group PAP during sleep on oxygen was significantly lower than PAP during sleep breathing air (mean (SD) difference 9.6 (5.3) mm Hg, 95% CI 4.9 to 14.3, p= 0.016). PAP during exercise was not significantly different from PAP during sleep breathing air (mean (SD) difference 0.8 (8.9) mm Hg, 95% CI –7.0 to 8.6, p= 0.851). In normal individuals the group mean (SD) PAP was 15 (5.9) mm Hg for the first nocturnal period and 15 (5.7) mm Hg for the second nocturnal period. PAP during exercise was not significantly different from PAP during sleep breathing air (mean (SD) difference 3.3 (2.2) mm Hg, 95% CI 1.1 to 5.5, p= 0.061).

Conclusion: In patients with COPD, PAP rose significantly during sleep to levels similar to those measured during exercise, but this could be reversed with oxygen.

Footnotes

  • Supported by a British Heart Foundation project grant.

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