Correlations between serum amyloid A, C‐reactive protein and clinical indices of patients with acutely exacerbated chronic obstructive pulmonary disease

BACKGROUND: To explore the correlations between SAA, CRP, and clinical indices of patients with acutely exacerbated chronic obstructive pulmonary disease (AECOPD). METHODS: A total of 120 patients with AECOPD and another 120 with remitted COPD were enrolled in an AECOPD group and a COPD remission group, respectively. Meanwhile, 120 healthy subjects were included as a control group. SAA, CRP, PCT, Fbg, IL‐8, IL‐6, TNF‐α, and IP‐10 levels were detected. FEV(1) and FEV(1)/FVC were measured. RESULTS: Compared with control group, the serum levels of SAA, CRP, PCT, Fbg, IL‐8, IL‐6, TNF‐α, and IP‐10 significantly increased in COPD remission group (P < 0.05). The levels of AECOPD group significantly exceeded those of COPD remission group (P < 0.05). The levels of AECOPD patients with different GOLD grades were significantly different (P < 0.05). AECOPD group had significantly lower FEV(1) and FEV(1)/FVC than those of COPD remission group (P < 0.05). The CAT score of AECOPD patients was (18.41 ± 2.55) points. The levels of SAA, CRP, PCT, Fbg, IL‐8, IL‐6, TNF‐α, and IP‐10 were negatively correlated with FEV(1) and FEV(1)/FVC, and positively correlated with CAT score. The area under receiver operating characteristic curve of SAA was largest (0.931). The cutoff values for SAA, CRP, PCT and Fbg were 18.68 mg/L, 14.70 mg/L, 0.39 μg/L, 3.91 g/L, 0.46 μg/L, 24.17 μg/L, 7.18 mg/L, and 83.19 ng/L, respectively. CONCLUSIONS: Serum levels of SAA, CRP, PCT, Fbg, IL‐8, IL‐6, TNF‐α, and IP‐10 in AECOPD patients were elevated, which may undermine pulmonary functions. SAA can be used as an effective index for AECOPD diagnosis and treatment.