ALDH7A1 and peritonitis: PDE samples were collected for biomarkers analysis.The percentage of eryptotic RBCs was significantly higher in PD patients with peritonitis than in CTR (PD patients with peritonitis: 7.7; IQR 4.3–14.2, versus CTR: 0.8; IQR 0.7–1.3; p < 0.001).