The Role of EDD (Exercise Capacity, Dyspnea, and Diffusing Capacity of Lungs for Carbon Monoxide) Index in Pulmonary Fibrosis Secondary to Scleroderma

Introduction: Pulmonary involvement secondary to Systemic Sclerosis (SSc) is the major cause of morbidity and mortality in SSc patients. We designed this study to determine the correlation of important lung function parameters with lung High Resolution CT (HRCT) scan findings. Materials and Methods: Thirty–two consecutive diffuse SSc patients with pulmonary fibrosis were enrolled in this cross-sectional study. Patients with pulmonary fibrosis secondary to other causes, previous restrictive lung disease, and history of smoking were excluded. Complete lung function evaluation was performed. The EDD (Exercise capacity, Dyspnea, and Diffusing capacity of lungs for carbon monoxide) index was determined. The Warrick score was calculated based on lung HRCT findings. Results: The mean age of the patients was 39.18 years ±9.39 (SD).Seventeen (53%) patients were in EDD stage 1 (score: 0≤score≤3), 9 patients (28%) in stage 2 (3