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Background: The main issues faced during the treatment of apical periodontitis are the management of bacterial infection and the facilitation of the repair of alveolar bone defects to shorten disease duration. Conventional root canal irrigants are limited in their efficacy and are associated with several side effects. This study introduces a synergistic therapy based on nitric oxide (NO) and antimicrobial photodynamic therapy (aPDT) for the treatment of apical periodontitis. Results: This research developed a multifunctional nanoparticle, CGP, utilizing guanidinylated poly (ethylene glycol)-poly (ε-Caprolactone) polymer as a carrier, internally loaded with the photosensitizer chlorin e6. During root canal irrigation, the guanidino groups on the surface of CGP enabled effective biofilm penetration. These groups undergo oxidation by hydrogen peroxide in the aPDT process, triggering the release of NO without hindering the production of singlet oxygen. The generated NO significantly enhanced the antimicrobial capability and biofilm eradication efficacy of aPDT. Furthermore, CGP not only outperforms conventional aPDT in eradicating biofilms but also effectively promotes the repair of alveolar bone defects post-eradication. Importantly, our findings reveal that CGP exhibits significantly higher biosafety compared to sodium hypochlorite, alongside superior therapeutic efficacy in a rat model of apical periodontitis. Conclusions: This study demonstrates that CGP, an effective root irrigation system based on aPDT and NO, has a promising application in root canal therapy. [ABSTRACT FROM AUTHOR]

Purpose: The levels of human epididymis protein 4 (HE4) is associated not only with the prognosis of patients with acute heart failure (AHF), but also with chronic kidney disease (CKD). Our study aims to understand the prediction value of HE4 on prognosis in patients with AHF combined with CKD. Patients and Methods: This study prospectively enrolled patients diagnosed with AHF combined with CKD at the Department of Cardiology of Hunan Provincial People's Hospital from March 2019 to December 2022. Serum levels of HE4 were measured using a chemiluminescence microparticle immunoassay. The endpoint events included heart failure readmission and cardiovascular death. Results: A total of 130 patients with AHF combined with CKD were included in the stud. The median age is 73 years (interquartile range: 65– 79 years). Among the patients, 94 experienced the endpoint events. The multivariable Cox analysis reveals that LnHE4 (HR=2.280, 95% CI 1.300– 3.998, P = 0.004) and age (HR=1.024, 95% CI 1.003– 1.045, P = 0.025) are independent predictors of the endpoint events. The Kaplan-Meier survival curve demonstrates that patients with HE4 levels> 276.15 pmol/L has a significantly higher incidence of endpoint events compared to those with HE4 levels≤ 276.15 pmol/L (Log rank test: χ 2=19.689, P < 0.001). After adjusting for age and gender, the HR is 2.520 (95% CI: 1.626– 3.906, P < 0.001). Conclusion: HE4 is an independent predictor of heart failure readmission and cardiovascular death in patients with AHF combined with CKD. [ABSTRACT FROM AUTHOR]