The Relevance of Serum Cystatin C Level of Different Classification of Atrial Fibrillation

Objective: To investigate the relationship between serum level of cystatin C (Cys-C) and AF (atrial fibrillation) and its clinical classification. Method: From January 2017 to April 2019, 168 cases of Xiaogan Central Hospital were chosen as the object of this study. The subjects were divided into 86 patients with AF and 82 patients in the control group. The AF group was divided into paroxysmal AF group (29 cases), persistent AF group (27 cases) and permanent AF group (29 cases) according to the European atrial fibrillation management guidelines and the North America Society of Pacing and Electrophysiology (NASPE) arrhythmia group organized the categorization of AF. Results: Compared with the control group, the level of the serum Cys-C was significantly higher in the AF group, the difference was statistically significant (P < 0.05). There was significant difference in Cys-C level in patients with different types of AF (P < 0.05). The levels of neutrophil percentage, low density lipoprotein cholesterol (LDL-C), left ventricular diameter, left atrial diameter, C-reactive protein (CRP) and homocysteine in the AF group were significantly higher than those in the control group (P < 0.05). The difference of neutrophil percentage, LDL-C, left ventricular ejection fraction, left atrial diameter, CRP and homocysteine levels in patients with different types of atrial fibrillation was statistically significant (P < 0.05). Logistic analysis showed that the serum Cys-C level, CRP, homocysteine, left ventricular diameter, left atrial diameter could be used as an independent predictor of atrial fibrillation when other factors were corrected. Conclusion: Serum Cys-C level in atrial fibrillation group is significantly higher than the control group, there are differences between different atrial fibrillation clinical classification, its level increased with duration of atrial fibrillation. Serum Cys-C level and inflammatory markers CRP, WBC and neutrophilic granulocyte percentage were positively correlated, indicating that serum cystatin C is associated with chronic inflammation, involved in the occurrence of atrial fibrillation, maintain and recurrence. Logistic analysis showed that the serum cystatin C level could be used as an independent predictor of atrial fibrillation when other factors were corrected.