Purpose: The purpose of this study was to assess the skin involvement in systemic scleroderma patients (SSc) with 2D-Shear Wave Elastography (2D-SWE) and to review the corelation between skin elasticity and pulmonary involvement.
Methods: Thirty SSc patients and 30 controls were examined using 2D-SWE. The demographics matched both groups. B-mode ultrasound (US) and 2D-SWE assessed skin thickness and elastography from the ventral side of the right forearm in each subjective. ROC analysis determined optimal group separation cut-off values. A rheumatologist applied mRSS for SSc patients. US, mRSS, and pulmonary involvement correlations were reviewed.
Results: US parameter values (skin thickness, median kPa, median m/s) were higher in the SSc patient group (1.78 ± 0.36 mm, 22.15 ± 16.26, 2.60 ± 0.82, respectively) compared to the control group (1.55 ± 0.2 mm, 7.45 ± 1.84, 1.56 ± 0.2, respectively, p < 0.05). When the optimal cut-off SWE values for separating groups was determined as 10.5 kPa and 1.87 m/s, the sensitivity was 93% and the specificity was 97%. Pearson's correlation analysis showed a strong positive correlation between mRSS and median SWE values (kPa, r = 0.626, p = 0.001; m/s, r = 0.638, p < 0.001). There was no correlation between pulmonary involvement of SSc patients with mRSS and US parameters.
Conclusion: 2D-SWE is a promising non-invasive method to evaluate skin involvement in SSc patient group. For pulmonary involvement we need more data with bigger patient groups.
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