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Chinese Journal of Lung Diseases(Electronic Edition) ›› 2025, Vol. 18 ›› Issue (04): 609-614. doi: 10.3877/cma.j.issn.1674-6902.2025.04.020

• Original Article • Previous Articles    

Correlation analysis of serum soluble suppression of tumorigenicity-2 with hemodynamic parameters and prognosis of pulmonary arterial hypertension

Yang Ren1, Fang Lin1, Wenjuan Jiang2,(), Ni Wang1, Feifei Du1, Yaxin Qiao1   

  1. 1Department of Geriatrics, Yan′an University Affiliated Hospital, Yan′an, Shaanxi, 716000, China
    2Department of Critical Care Medicine, Yan′an University Affiliated Hospital, Yan′an, Shaanxi, 716000, China
  • Received:2025-04-23 Online:2025-08-25 Published:2025-09-08
  • Contact: Wenjuan Jiang

Abstract:

Objective

To analyze the correlation between serum soluble suppression of tumorigenicity-2 (sST-2) levels and pulmonary arterial hypertension (PAH) hemodynamics, and to evaluate the predictive value of sST-2 for PAH prognosis.

Methods

Seventy-one PAH patients admitted to our hospital from January 2020 to December 2024 were enrolled. Blood samples were collected after right heart catheterization, and serum sST-2 levels were measured using the Presage ST2 assay. Spearman correlation and multivariate linear regression analyses were performed to assess the relationships between serum sST-2 and mean pulmonary artery pressure (mPAP), pulmonary artery wedge pressure (PAWP), pulmonary vascular resistance (PVR), right atrial pressure (RAP), partial pressure of oxygen in pulmonary artery blood (PaO2), and partial pressure of carbon dioxide in pulmonary artery blood (PaCO2).

Results

The median serum sST-2 level in PAH patients was 41.12 ng/ml. By the end of follow-up, clinical worsening occurred in 21 patients (29.57%), including 5 cases of WHO functional class (WHO-FC) deterioration, 4 cases requiring escalation of PAH-specific therapy, 8 cases rehospitalized due to heart failure or PAH progression and 4 deaths related to PAH. Serum sST-2 showed positive correlations with mPAP (rho=0.328, P<0.001), PVR (rho=0.331, P<0.001), WHO-FC (rho=0.305, P<0.001), and NYHA functional class (rho=0.196, P=0.031), and negative correlations with PaO2(rho=-0.313, P<0.001) and 6-minute walking distance (6MWD) (rho=-0.269, P=0.003). Multivariate linear regression analysis revealed that sST-2 was positively associated with WHO-FC, mPAP, and PVR, and negatively associated with 6MWD and PaO2(P<0.05). Multivariate analysis identified sST-2 (HR=1.007, P=0.003) and PaO2(HR=0.930, P=0.016) as predictive variables for clinical worsening in PAH patients. The combination of sST-2 and PaO2 achieved a sensitivity of 88.89% and specificity of 61.18% for predicting the risk of clinical worsening in PAH patients.

Conclusions

PAH patients exhibit elevated serum sST-2 levels. Higher sST-2 is associated with poor functional status and abnormal hemodynamics. sST-2 serves as a predictor of clinical worsening in PAH patients and demonstrates predictive value when combined with PaO2.

Key words: Soluble suppression of tumorigenicity-2, Pulmonary hypertension, Hemodynamics, Correlation, Prognosis

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