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Does 6 minute walk test predict nocturnal oxygen desaturation in COPD patients?

Sinem Iliaz, Tulin Cagatay, Zuleyha Bingol, Gulfer Okumus, Goksen Kuran, Raim Iliaz, Aysen Dokme, Fatma Comce, Esen Kiyan, Zeki Kilicaslan, Turhan Ece, Penbe Cagatay
European Respiratory Journal 2013 42: P2153; DOI:
Sinem Iliaz
1Department of Pulmonology, IU. Istanbul Medical Faculty, Istanbul, Turkey
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Tulin Cagatay
1Department of Pulmonology, IU. Istanbul Medical Faculty, Istanbul, Turkey
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Zuleyha Bingol
1Department of Pulmonology, IU. Istanbul Medical Faculty, Istanbul, Turkey
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Gulfer Okumus
1Department of Pulmonology, IU. Istanbul Medical Faculty, Istanbul, Turkey
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Goksen Kuran
2Department of Physical Therapy and Rehabilitation, IU. Istanbul Medical Faculty, Istanbul, Turkey
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Raim Iliaz
3Department of Internal Medicine, IU. Istanbul Medical Faculty, Istanbul, Turkey
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Aysen Dokme
1Department of Pulmonology, IU. Istanbul Medical Faculty, Istanbul, Turkey
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Fatma Comce
4Department of Pulmonology, Yedikule Hospital for Chest Diseases and Thoracic Surgery, Istanbul, Turkey
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Esen Kiyan
1Department of Pulmonology, IU. Istanbul Medical Faculty, Istanbul, Turkey
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Zeki Kilicaslan
1Department of Pulmonology, IU. Istanbul Medical Faculty, Istanbul, Turkey
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Turhan Ece
1Department of Pulmonology, IU. Istanbul Medical Faculty, Istanbul, Turkey
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Penbe Cagatay
5Department of Biostatistics, IU. Istanbul Medical Faculty, Istanbul, Turkey
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Abstract

INTRODUCTION: Patients with chronic obstructive pulmonary disease (COPD) who have nocturnal oxygen desaturation (NOD) should be treated with nocturnal oxygen therapy (NOT) for avoiding morbidity and mortality. Nocturnal oximetry is an expensive and time consuming test that used for evaluating NOD individuals.

AIM: To evaluate whether desaturation during 6-minute walk test (6MWT) is useful for predicting NOD in COPD.

METHODS: Stable moderate or severe COPD patients were enrolled in this study. Spirometry and carbon monoxide diffusion test (DLCO), arterial blood gas analysis, 6MWT and nocturnal oximetry were performed. Patients with obstructive sleep apnea, hypoxemic respiratory failure, and who were receiving noninvasive mechanical ventilation therapy were excluded.

RESULTS: Totally 61 patients (55 male, age: 65.8±8.4) were analysed. Thirty of them had moderate and the others (n=31) had severe COPD. Forced expiratory volume 1 second was 1352±348ml (51.2%±11.8%). Patients who were desaturated during 6MWT had significantly lower DLCO, PaO2, SaO2 and higher PaCO2 levels than the patients who did not desaturated (p<0.001, p=0.001, p=0.001, p=0.02). NOD was more common in severe COPD patients or the patients with higher CO2 levels (p=0.02, p=0.001). Four patients (13%) with moderate COPD were desaturated during 6MWT, however they did not have NOD. Five (33%) of severe COPD patients who were desaturated during 6MWT(n=15) also had NOD. Moderate correspondence was found between 6MWT and NOD in severe COPD patients (Kappa=0.39, p<0.05).

CONCLUSION: 6MWT can be recommended as a simple, cheap tool for predicting NOD and selecting individuals for NOT particularly in severe COPD.

  • COPD - management
  • Oxygen therapy
  • Sleep studies
  • © 2013 ERS
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Does 6 minute walk test predict nocturnal oxygen desaturation in COPD patients?
Sinem Iliaz, Tulin Cagatay, Zuleyha Bingol, Gulfer Okumus, Goksen Kuran, Raim Iliaz, Aysen Dokme, Fatma Comce, Esen Kiyan, Zeki Kilicaslan, Turhan Ece, Penbe Cagatay
European Respiratory Journal Sep 2013, 42 (Suppl 57) P2153;

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Does 6 minute walk test predict nocturnal oxygen desaturation in COPD patients?
Sinem Iliaz, Tulin Cagatay, Zuleyha Bingol, Gulfer Okumus, Goksen Kuran, Raim Iliaz, Aysen Dokme, Fatma Comce, Esen Kiyan, Zeki Kilicaslan, Turhan Ece, Penbe Cagatay
European Respiratory Journal Sep 2013, 42 (Suppl 57) P2153;
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