[Risk factors associated with different types of Henoch-Schönlein purpura in Tibetan patients at high altitude].

OBJECTIVE

To investigate the risk factors of different types of Henoch-Schönlein purpura (HSP) in Tibetan patients at high altitude, as to provide reference for correctly identifying high-risk patients.

METHODS

A retrospective study was used to analyze the 304 HSP patients admitted to Tibet Autonomous Region People's Hospital from April 2014 to March 2022. The gender, age, allergic history, family history, clinical type, laboratory indexes (hemoglobin, platelet count, eosinophil, C-reactive protein (CRP), albumin, immunoglobulin G, immunoglobulin A, complement C3 and C4) were analyzed retrospectively. Univariate and multivariate Logistic regression analysis to screen for risk factors affecting different types of HSP.

RESULTS

Renal HSP patients showed higher IgA [(9.2±1.7) g/L (6.4±2.4) g/L, =0.015], lower complement C3 [(203.3±21.6) mg/dL (301.1±19.5) mg/dL, =0.043], and complement C4 [(33.5±2.3) mg/dL (53.0±7.2) mg/dL, =0.032]. The patients with abdominal HSP showed lower levels of hemoglobin [(119.6±19.6) g/L (146.6±47.3) g/L, =0.038] and plasma albumin [24.8 (22.1, 33.9) g/L 32.6 (24.6, 35.1) g/L, =0.045]. The patients with articular HSP exhibited higher CRP [13.5 (0.2, 20.6) g/L 7.5 (0.1, 15.2) g/L, =0.036] and erythrocyte sedimentation rate (ESR) [24 (5, 40) mm/h 15 (4, 30) mm/h, =0.049]. Elevated IgA and decreased complement C4 were risk factors for renal HSP, anemia and decreased plasma albumin were risk factors for abdominal HSP, and elevated CRP was a risk factor for articular HSP.

CONCLUSION

The clinical characteristics of different types of HSP in plateau areas were different. Patients with high IgA, low complement C4, anemia, hypoalbuminemia, and significantly elevated CRP should be highly vigilant. Early and effective intervention can improve the clinical efficacy, avoid severe development, and improve the prognosis.