Objective To analyze the occurrence and clinical features of chronic kidney disease (CKD) in the ICU patients and identify the possible risk factors.Methods A retrospective study was performed in 2281 ICU patients enrolled from Shengjing hospital between January 2007 and December 2010,in which 1860 cases had complete data and were followed-up,the other 421 cases were excluded for the reasons of dying,suffering from CKD originally,lacking complete data and missing.The cases were divided into CKD and non-CKD groups according to SCODRED and CKD diagnosis standards.Assessment was performed to screen risk factors of CKD.Results There were obvious differences between CKD and non-CKD groups at age,pregnancy,AKI and liver function (P ＜0.05).The CKD's annual morbidity rate of ICU patients was 20％-30％,and the incidence showed an increasing trend with time.Age,pregnancy,AKI,APACHE-Ⅱ score,invasive diagnosis and treatment,mechanical ventilation,organ failure and kidney-hurt drugs were risk factors for CKD in the ICU patients.Conclusions The morbidity rate of CKD in the ICU patients is high,and the number of CKD patients show an increasing trend with time.Age,APACHE-Ⅱ score ＞ 15,the number of failed organs ≥2,the variety of kidney-hurt drug≥2,pregnancy,AKI,the number of invasive diagnosis and treatment≥3,mechanical ventilation are independent risk factors of CKD in the ICU patients.

Objective To study the effects of different factors on the salvianolic acid B stability in water solution and to provide the experimental data for production and application of salvianolic acid B. Methods Effects of salvianolic acid B concentration, pH value, temperature, and holding period on salvianolic acid B stability in water solution were studied by the salvianolic acid B changes determined by HPLC in orthogonal design test. Results The most stable condition of salvianolic acid B is that the concentration is 1 mg/mL, pH value is 2, the temperature is 20℃ , and the holding period is one day. Conclusion Salvianolic acid B should be kept in the conditions of higher concentration, lower pH value, lower temperature, and shorter period in solution to ensure its stability.

Objective:To analyze the expression of mismatch repair (MMR) proteins in colorectal cancers (CRC) and to evaluate the feasibility and potential pitfalls of immunohistochemistry (IHC) analysis for MMR.Methods:The IHC sections for MMR proteins were reviewed in 3 428 cases of resected CRC without neoadjuvant therapy at Tianjin Medical University Cancer Institute and Hospital from July 2014 to October 2018. For the cases with unclear MMR IHC results during the initial review, IHC staining was repeated and microsatellite instability (MSI) analysis was performed. Relationships between the expression of MMR proteins and MSI status as well as the clinicopathological parameters were analyzed.Results:IHC staining for MMR was repeated in 28 (0.8%) cases due to poor quality of original IHC sections. Inconsistent results between the original diagnosis and re-diagnosis were found in 119 (3.5%) cases, mainly resulting from PMS2 and MLH1. Finally, 261 (7.6%) cases of CRC showed mismatch repair deficiency (dMMR), mainly from the deficiency of both MLH1 and PMS2 (43.3%,113/261). In the 14 cases with MSI results, the concordant of MSI and MMR was 13 cases. In the 29 dMMR cases with next generation sequencing (NGS) results, the concordant of MSI-high and dMMR was 93.1%(27/29). The cases with inconsistent results between MSI and MMR showed negative expression of MSH6 or PMS2. Twenty-one CRC showed negative expression of MLH1 and partially positive (or weak positive) expression of PMS2, or negative expression of MSH2 and partially positive (or weak positive) expression of MSH6. Among the 19 cases with MSI results, 16 cases were MSI-high, two cases were MSI-low, and one case was microsatellite stable. Compared with mismatch repair proficiency (pMMR), dMMR was more frequently detected in female patients younger than 50 years old, with family history, at early stage (Ⅰ-Ⅱ) CRC, and in the tumors from right colon,with poor differentiation, or mucinous adenocarcinoma/signet ring cell carcinoma (all P<0.05). Conclusions:At present, IHC staining is a clinically effective and convenient method to detect MMR expression, but the operating process and result assessment remain variable and need to be standardized. MSI analysis can be performed in the difficult-to-evaluate cases for MMR to enhance prognostic evaluation and treatment option.