Early decrease in erector spinae muscle area and future risk of mortality in idiopathic pulmonary fibrosis

Area of Science:

• Pulmonary Medicine
• Radiology
• Muscle Physiology

Background:

• Idiopathic pulmonary fibrosis (IPF) is a progressive lung disease with limited treatment options.
• Sarcopenia and cachexia are common in IPF and associated with poor outcomes.
• Computed tomography (CT) assessment of erector spinae muscle cross-sectional area (ESM_CSA) is a potential tool for evaluating muscle wasting.

Purpose of the Study:

• To investigate the association between serial changes in ESM_CSA and survival in patients with IPF.
• To determine if ESM_CSA decline is an independent prognostic factor in IPF.

Main Methods:

• Retrospective review of CT images from 119 IPF patients.
• Measurement of ESM_CSA at the 12th thoracic vertebra at baseline and 6-month follow-up.
• Survival analysis using Cox regression models.

Main Results:

• Univariate analysis identified declines in % predicted forced vital capacity (FVC), body mass index (BMI), and ESM_CSA as prognostic factors.
• Multivariate analysis revealed that a decline in ESM_CSA was a significant independent predictor of survival (HR 1.039, P=0.015).
• Declines in % FVC and BMI were not significant in multivariate analysis.

Conclusions:

• Early decrease in ESM_CSA is a significant prognostic factor in patients with IPF.
• Serial CT assessment of ESM_CSA may serve as a valuable tool for predicting survival in IPF.
• This finding could aid in risk stratification and clinical management of IPF patients.