Spirometry, cardiopulmonary exercise testing and the six-minute walk test results in sarcoidosis patients

Arda Kiani; Alireza Eslaminejad; Mohsen Shafeipour; Fatemeh Razavi; Seyyed Reza Seyyedi; Babak Sharif-Kashani; Habib Emami; Mehrdad Bakhshayesh-Karam; Atefeh Abedini

doi:10.36141/svdld.v36i3.7663

Spirometry, cardiopulmonary exercise testing and the six-minute walk test results in sarcoidosis patients

Authors

Arda Kiani Tracheal Diseases Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
Alireza Eslaminejad Chronic Respiratory Diseases Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
Mohsen Shafeipour Departments of Pulmonology, Kerman University Of Medical Science, Kerman, Iran
Fatemeh Razavi Chronic Respiratory Diseases Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
Seyyed Reza Seyyedi Lung Transplantation Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
Babak Sharif-Kashani Tobacco Prevention and Control Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
Habib Emami Tobacco Prevention and Control Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
Mehrdad Bakhshayesh-Karam Pediatric Respiratory Diseases Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
Atefeh Abedini Chronic Respiratory Diseases Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences

Keywords:

Respiratory function tests (D012129), Cardiopulmonary exercise testing (D005080), 6-minute walk test, Sarcoidosis (D012507), Spirometry (D013147

Abstract

Background: The 6-minute walking test, cardiopulmonary exercise testing, and spirometry are useful tools for evaluation of respiratory impairment and functional capacity in patients with lung disease. Sarcoidosis is a multisystem granulomatous disease of unknown etiology. Objectives: Since the pulmonary involvement can affect the quality of life in sarcoidosis patients, this study is aimed to evaluate the tests mentioned above in order to examine the functional capacity of sarcoidosis patients in different stages as well as the cause of exercise intolerance. Methods: This cross-sectional study was carried out on 50 Iranian patients with sarcoidosis. Patients were classified into three groups based on the findings of the chest radiography as well as the pulmonary CT scan, reported by an expert radiologist. Pulmonary, cardiac, and activity function have been evaluated in the patients, using cardiopulmonary exercise testing, the 6-minutes walking test, and spirometry. Results: In cardiopulmonary exercise testing, percent-predicted peak VO₂ (57.75±15.49, p=0.015) and percent-predicted O₂ pulse (70.54±17.37, p=0.013) were significantly lower in the third group, in comparison with the others. Also, VE/CO₂ (AT) (34.99±5.67, p=0.000) was significantly higher in the third group, in comparison with the other ones. Percent-predicted VO₂ showed a strong positive correlation with age (r=0.377, p=0.009), TSH (r= 0.404, p=0.007), and percent-predicted FVC (r=0.443, p=0.002). In addition, O₂ pulse had a positive correlation with BMI (r=0.324, p=0.026), percent-predicted FVC (r=0.557, p= 0.000), and percent-predicted FEV₁ (r=0.316, p=0.032). Conclusions: According to this study, ventilatory limitation, pulmonary involvement, and deconditioning are the main causes of activity limitations in sarcoidosis patients.