Annals of Thoracic Medicine Official publication of the Saudi Thoracic Society, affiliated to King Saud University
 
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ORIGINAL ARTICLE
Year : 2009  |  Volume : 4  |  Issue : 2  |  Page : 60-64

The six-minute walk test in patients with pulmonary sarcoidosis


Department of Medicine, Division of Pulmonary Medicine, King Khalid University Hospital, King Saud University, Riyadh, Saudi Arabia

Correspondence Address:
Esam H Alhamad
Department of Medicine, Division of Pulmonary Medicine, King Khalid University Hospital, King Saud University, P.O. Box 18321, Riyadh 11415
Saudi Arabia
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DOI: 10.4103/1817-1737.49414

PMID: 19561926

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Background: The 6-min walk test (6MWT) is a useful tool to assess prognosis and functional impairment in various pulmonary diseases. Aims: To evaluate functional capacity during various stages of pulmonary sarcoidosis and develop a scoring system clinical radiological physiological score (CRP) that can potentially be used to assess the functional status among patients with sarcoidosis. Materials and Methods: We performed a retrospective study on 26 patients diagnosed with pulmonary sarcoidosis from 2001 to 2007. All patients completed the 6MWT. The parameters assessed during the test included spirometry, arterial blood gas, 6-min walk distance (6MWD), Borg dyspnea score, and initial and end oxygen saturation. Results: Females covered a significantly shorter distance than males (343 m (223-389) vs. 416.5 m (352-500); P < 0.0001). In addition, females had a significantly lower SpO 2 at the end of the 6MWT than males (90.5 (61-99) vs. 96 (75-98); P < 0.03). The 6MWD was inversely correlated with the final Borg score (r = −0.603, P = 0.004) and the CRP score (r = -0.364, P = 0.047) and positively correlated with forced expiratory volume in 1 s (FEV 1 ) % (r = 0.524, P = 0.006) and forced vital capacity (FVC) % (r = 0.407, P = 0.039). Conclusions: Female gender, FEV 1 %, final Borg score, FVC%, CRP score, and SpO 2 at the end of the 6MWT are associated with reduced 6MWD. It appears that Saudi patients diagnosed with sarcoidosis have a markedly reduced walking distance compared with other races. The effect of race and ethnicity and the utility of the CRP score as a potential marker to assess functional status require further exploration.


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