BACKGROUND:Some studies have shown that the double-bundle posterior cruciate ligament reconstruction is not superior to the single-bundle posterior cruciate ligament reconstruction, and stil has some deficiencies difficult to overcome. Which is better, double-bundle reconstruction or single-bundle reconstruction? There is no uniform conclusion. OBJECTIVE:To perform a prospective cohort study on the clinical efficacy and safety of autologous single- and double-bundle posterior cruciate ligament reconstruction. METHODS:Totaly 81 patients with posterior cruciate ligament injury were randomly divided into single-bundle reconstruction group (n=41) and double-bundle reconstruction group (n=40). The knee stability, Lysholm score, Tegner score, hospital stay, operation time, fever days and number of puncture cases were compared between the two groups before and 24 months after reconstruction. RESULTS AND CONCLUSION:Compared with the single-bundle reconstruction group, the knee stability was significantly worse in the double-bundle reconstruction group (F=4.362,P=0.000); the operation time, hospital stay and number of puncture cases were also higher in the double-bundle reconstruction group (P < 0.05). At 24 months after reconstruction, the Lysholm and Tegner scores were both increased significantly in the two groups (P < 0.05), but there was no difference between the two groups (P > 0.05). These findings indicate that both single- and double-bundle reconstruction under arthroscopy is safe and effective treatment for posterior cruciate ligament injury, but the double-bundle reconstruction is not recommended as the preferred surgical procedure because of longer time and larger trauma.

Objective To explore the relationship between Wuyishan cliff tea and esophageal cancer,and make integrated measures to prevent and control esophageal cancer.Methods A case-control study was conducted with a ratio of 1 to 1 and a health survey was conducted on objects which included 92 cases with histologically confirmed diagnoses of squamous-cell carcinoma of the esophagus and 92 controls matched by age,sex and resident.The analysis method of conditional logistic regression was used to analyze the influence of cliff tea on the development of esophageal cancer. Results The frequency of cliff tea drinking was 73.91% in cases with esophageal cancer compared with 84.78% in controls. As compared with subjects without tea drinking,subjects with cliff tea drinking significantly decreased the risk for developing esophageal cancer (P<0.05),and its OR were 0.60.The risk of esophageal cancer significantly reduced with increasing frequency of cliff tea drinking per week. Furthermore, we also found that the risk of esophageal cancer significantly reduced with the duration of cliff tea drinking and the early of beginning to drink cliff tea.Conclusion Wuyishan cliff tea drinking may protect against the risk of esophageal cancer.

Objective To investigate the incidence and related risk factors of post-traumatic stress disorders (PTSD) after acci-dents in the Pearl River Delta .Methods Inpatients after accidents from April 2009 to February 2010 in seven hospitals of the Pearl River Delta cities ,such as Guangzhou ,Shenzhen and Zhuhai ,were surveyed with PTSD Checklist-Civilian Version (PCL-C) and self-made questionnaire .Results In a total of 554 post traumatic patients ,a prevalence of 28 .5% of PTSD symptoms were found in this region with 7 .8% (marks≥50) of severe degree and 20 .8% (marks :38-49) of mild to moderate degree .In the severe PTSD symptoms group ,the top three items were getting nervous and upset once faced similar situation ,difficulty sleeping or easy to be a-wake ,and the trauma experience caused recurring disturbing memory ,ideas or image .Multivariate analysis showed that female ,una-ble self-care ,incapable of working ,lack help from friends ,multiple injury ,and injury time longer were all associated with the PTSD symptom incidence .Conclusion The prevalence of PTSD symptoms is relatively high in injured patients after accidents in the Pearl River Delta .Early identification and intervention of PTSD symptoms in post-traumatic patients are important for the prevention of PTSD .

Objective To investigate the clinical significance of combined heart and lung ultrasound in patients with severe left heart failure and pulmonary hypertension. Methods From March 2016 to June 2017, 75 patients with grade Ⅲ and Ⅳ heart failure and dyspnea were enrolled in Qingdao Municipal Hospital Affiliated to Qingdao University. Thirty-three patients had normal pulmonary artery pressure (normal pulmonary arterial pressure group), 25 patients had mild pulmonary hypertension (mild pulmonary hypertension group), and 17 patients had moderate to severe pulmonary hypertension (moderate to severe pulmonary hypertension group). The patient′s plasma B-type natriuretic peptide (BNP) was measured. Left ventricular diameter (LVD), right ventricular diameter (RVD), and left ventricular ejection fraction (LVEF) were measured by echocardiography. The patient′s lungs were observed by lung ultrasonography, and its number was recorded. One-way analysis of variance was used to compare the differences of LVD, RVD, and LVEF in three groups of patients with severe left heart failure. Further comparison between groups was performed using LSD-t test. Kruskal-wallis H test was used to compare the plasma BNP concentration and B-line number in three groups of patients with severe left heart failure. The Mann-Whitney U test was used to further compare the groups. The receiver operating characteristic (ROC) curve of pulmonary hypertension diagnosed by plasma BNP concentration and B line number in patients with severe left heart failure were drwan. Results The concentrations of BNP in patients with normal pulmonary arterial pressure, mild pulmonary hypertension, and moderate to severe pulmonary hypertension were 890 (614, 1516), 1460 (1245, 1950), and 2660 (1670, 3279) ng/L, respectively. The number of B line was 12 (9, 16), 17 (14, 18), 26 (20, 28), and the RVD was (22.1±1.7), (24.9±2.0), (26.3±2.8) mm, respectively. The number of B-line and RVD in the moderate-severe pulmonary hypertension group were both lager than those in the mild pulmonary hypertension group, and the number of B-line and RVD in the mild pulmonary hypertension group were both lager than those in the normal pulmonary artery pressure group. There was significant difference between any two groups (BNP concentration: U=210.500, P < 0.05; U=47.000, 73.000, both P < 0.001;B line number:U=189.000,P < 0.05;U=38.5000,64.000,both P < 0.001;RVD:t=0.553, 0.623, both P<0.001; t=0.656, P<0.05). There was no significant difference in LVD and LVEF between the three groups of patients. The ROC curve showed that the optimal threshold for the diagnosis of pulmonary hypertension in patients with severe left heart failure with BNP concentration was 1225 ng/L. The sensitivity was 85.7%,the specificity was 69.7%,the area under the curve was 0.814,and the 95% CI was 0.717 to 0.911. The optimal threshold for diagnosis of pulmonary hypertension in patients with severe left heart failure was B line number 14, the sensitivity was 88.1%, specificity was 66.7%, the area under the curve was 0.836, and 95%CI was 0.747 to 0.925.Conclusion Patients with severe left heart failure at different pulmonary artery pressure levels have different B-line findings, and the number of B-line increases with the severity of pulmonary hypertension, which warrants further study and application.