Computed Tomographic Scoring Systems in Sarcoidosis: Comparison With Cardiopulmonary Exercise Testing Parameters

Area of Science:

• Pulmonary Medicine
• Radiology
• Exercise Physiology

Background:

• Pulmonary sarcoidosis is a multisystem inflammatory disease that can affect lung function.
• Assessing sarcoidosis severity and its impact on exercise capacity is crucial for patient management.
• Computed tomography (CT) plays a key role in diagnosing and monitoring sarcoidosis.

Purpose of the Study:

• To correlate computed tomographic (CT) scoring systems for pulmonary sarcoidosis with cardiopulmonary exercise testing (CPET).
• To evaluate which CT scoring system best reflects disease severity and predicts exercise gas exchange impairment.

Main Methods:

• Retrospective analysis of 62 patients with pulmonary sarcoidosis.
• Thin-section CT, pulmonary function tests, and CPET were performed.
• CT images were scored using established systems (Remy-Jardin), and correlations with functional parameters were analyzed using Spearman rank and multiple regression.

Main Results:

• CT scores, particularly ground-glass and linear opacities, significantly correlated with maximal oxygen partial pressure (PaO2max).
• The Leung CT scoring system's subscores for ground-glass and linear opacity explained significant variance in functional parameters at rest and during maximal exercise.
• CT findings are associated with impaired gas exchange during exercise.

Conclusions:

• CT findings, specifically ground-glass and linear abnormalities, are significant predictors of cardiopulmonary exercise parameters in sarcoidosis.
• CT-based scoring systems are validated as reliable measures of sarcoidosis disease severity.
• CT imaging provides valuable insights into exercise limitation in patients with pulmonary sarcoidosis.