Subtle lung abnormalities may reflect early disease activity in patients with very early systemic sclerosis. A retrospective longitudinal analysis followed 73 at-risk patients over a median of five years. Researchers found that patients who progressed to established systemic sclerosis consistently showed lower baseline lung function values, with a threshold below 70% strongly associated with increased risk over time. This suggests early lung changes are a measurable extension of underlying autoimmune activity.
Only 12% of patients transitioned to systemic sclerosis during follow-up, but these progressors shared key rheumatologic features, including positivity for disease-specific antibodies and evidence of early vascular changes, alongside reduced baseline lung function. Autoimmune markers and capillaroscopic patterns were the strongest predictors of progression, but lung function added significant insight when combined with these indicators.
The findings support using pulmonary testing as part of a broader rheumatologic evaluation. Tracking subtle declines in lung function over time may help identify higher-risk patients earlier and refine monitoring strategies, challenging the assumption that stable patients are truly static.