BACKGROUND:Poly(3-hydroxybutyrate) is approved as its excel ent biocompatibility, biodegradability and piezoelectric properties, but there are also some deficiencies, such as high breakability and poor hydrophilicity. METHODS:Poly(3-hydroxybutyrate) was mixed with different mass percentages of nanohydroxyapatite (0, 10%, 20%and 30%) to prepare new composite fibrous scaffolds through electrospinning process. The microstructure, group composition, crystal ine phase distribution, thermal properties and surface wettability of the scaffolds were detected. RESULTS AND CONCLUSION:Under the scanning electron microscope, with the increase of nano-hydroxyapatite content, more and more nano-hydroxyapatite particles were distributed evenly on the composite fiber surface;the fiber surface was basical y covered with nano-hydroxyapatite particles at the content of 30%, and the roughness of the fiber surface also increased. Results from differential scanning calorimetry and X-ray diffraction showed that the nano-hydroxyapatite reduced the crystal inity of poly(3-hydroxybutyrate) and the crystal tacticity, and this phenomenon became more evident with the increase of nano-hydroxyapatite content. Additional y, the higher the content of nano-hydroxyapatite content, the lower the contact angle and the higher the hydrophily. These findings indicate that the nano-hydroxyapatite/poly(3-hydroxybutyrate) ultrafine-fibrous scaffold using electrospinning technology can effectively improve the surface wettability and crystal inity of the material as wel as the material hydrophily and brittleness, and the higher the content of nano-hydroxyapatite, the more obvious the effect.

Objective To evaluate the reliability of the panoramic radiographs for diagnosing mandibular asymmetry.Methods A total of 25 cases with no asymmetry in chief complaint or in appearance were selected for symmetry group.Pa and PAC from 16 cases of facial asymmetry were selected for asymmetric group.Marker points were fixed,a reference line and the reference plane drawn,and then relevant measurement items determined.The repeatability of the fixed position was observed.The difference of all measurement items between the left and right on Pa in symmetry group and asymmetric group were compared respectively and the asymmetric rate of corresponding measuredvalues on two sides between two groups were observed too.Correlation test was used to evaluate the measured-values on Pa and PAC in asymmetric group.Results Dispersion became smaller with the help of reference line and reference plane.And the dispersion was larger when Me was used as a marker other than MF.Most measured-values in symmetry group on Pa and all measured-values in asymmetric group on Pa showed statistically significant difference (P＜ 0.05).The mean difference of CP-GoP distance representing the vertical measured-value was 4.73 mm (P＜0.01); and the mean difference of GoP-MF distance representing the horizontal measured-value was 5.77 mm (P＜0.01).The horizontal measurements on PA and PAC showed closer correlation (r=0.78～0.85,P＜0.01) while the vertical was poorer (r=0.64,P＜0.01).Conclusions This study suggests that marking assisted with reference line and reference plane could get a more repeatable fixed-point on Pa.MF point could be used as a fixed-point for measuring mandibular asymmetry on Pa and the Pa measurement can be used to evaluate mandibular asymmetry.

Objective To explore the clinical application value of transcatheter arterial chemoembolization (TACE) combined with CT-guided percutaneous acetic acid injection (PAI) in treatment of huge hepatocellular carcinoma (HCC). Methods Forty-three patients with huge HCC were randomly divided into two group. Twenty-one patients in group A underwent routine one course for TACE (three times), and the interval of TACEs was one month. Twenty-two patients in group B underwent TACE combined with PAI, and CT-guided PAI was performed once a week since 2-3 weeks after first TACE, and one course included 6-9 times of PAI. Postoperative follow-up was conducted (including AFP, the size of tumor, etc.). One course of treatment was repeated in case of tumor recurred. Results At the 1st month after treatment, no statistical difference was found of AFP positive rate between two groups. Statistical difference of total effective rate was found between two groups (38.10% vs 77.27%). The 1-, 2- and 3-year survival rate In group A was 47.62%, 23.81% and 9.52%, respectively, while in group B was 81.82%, 54.55% and 36.36%, respectively, and significant differences were found between the two groups for the same period. Conclusion TACE combined with PAI is safe and more effective than TACE alone in the treatment of huge HCC.

Objective To evaluate the efficacy of DSA-guided percutaneous transhepatic gallbladder catheter drainage (PTGCD) in treating aged patients with acute cholecystitis complicated by severe diseases. Methods The clinical data of 15 aged patients with acute cholecystitis or complicated by severe diseases, who were encountered at authors’ hospital in the past three years and were treated with PTGCD, were retrospectively analyzed. The clinical results were discussed. Results PTGCD was successfully accomplished with single procedure in all 15 patients. Abdominal pain was relieved within one to three days, and the abdominal symptoms and signs subsided or disappeared. Reexamination of routine blood test showed that the white blood cell count decreased to normal range in 1 - 2 weeks, and complete cure was achieved in some patients. Secondary surgery was carried out in some patients after the clinical condition was improved. During the follow-up period no complications occurred in all patients except one who developed biliary leakage after the catheter was retrieved two weeks after the treatment. Conclusion For the treatment of complicated acute cholecystitis in aged patients who are not suitable to receive surgery, DSA-guided percutaneous transhepatic gallbladder catheter drainage is an ideal therapeutic means as it can significantly relieve clinical symptoms.

Objective To analyze the CT signs of acute blunt or penetrating intestinal injury,and to improve the diagnostic accuracy of multi spiral CT for intestinal injury.Methods The CT and clinical data of 63 patients with intestinal injury confirmed by clinical surgical exploration who underwent emergency CT scan were collected,and the CT findings and surgical findings were comparatively analyzed.Results There were 63 cases of intestinal injury,of which 26 cases were complicated with mesenteric injury.The direct CT signs of intestinal injury included intestinal wall thickening sign and intestinal discontinuity sign,which accounted for 64%(40/63)and 17%(10/63),respectively.The indirect CT signs of intestinal injury included intraperitoneal/retroperitoneal gas sign,intraperitoneal/retroperitoneal effusion sign,intramural air,and portal venous gas,which accounted for 72%(45/63),88%(55/63),7%(5/63)and 5%(3/63),respectively.Conclusion Recognizing the CT signs of intestinal injury,such as intestinal wall thickening sign,intestinal discontinuity sign,intraperitoneal/retroperitoneal gas sign,intraperitoneal/retroperitoneal effusion sign,intramural air,and portal venous gas can help to make the early and correct diagnosis of intestinal injury if combined with clinical practice.

Objective:To evaluate the prognostic value of sepsis-induced coagulopathy (SIC) in patients with sepsis.Methods:From January 2019 to December 2021, patients with sepsis admitted to the Intensive Care Unit of our hospital were retrospectively classified into the SIC group and non-SIC group according to SIC diagnostic criteria. The baseline clinical data, severity score, total length of hospital stay, length of ICU stay and 28-day survival were compared between the two groups. Kaplan-Meier was used to compare the 28-day survival of patients with sepsis between the two groups. Cox proportional hazard regression model was employed to analyze the risk factors of prognosis in patients with sepsis.Results:Totally 274 patients with sepsis were included in the analysis, including 139 patients in the SIC group and 135 patients in the non-SIC group. The two groups were compared in the perspectives of the Platelet count (PLT), prothrombin time (PT) , procalcitonin (PCT), D dimer, hematocrit, red blood cell distribution width, hemoglobin, acute kidney injury (AKI), the use of continuous renal replacement treatment (CRRT), the use of vasoactive drugs, sequential organ failure assessment (SOFA) score, acute physiology and chronic health evaluation (APACHEⅡ) score were compared between the two groups and the difference were statistically different (all P<0.05). Kaplan-Meier analysis showed that the 28-day mortality rate in the SIC group was significantly higher than that in the non-SIC group (32.4% vs. 14.1%, P<0.05). COX proportional hazard model showed that SIC score ( HR= 2.17, 95% CI: 1.15-3.91, P<0.05), APACHEⅡ score ( HR= 1.13, 95% CI: 1.09-1.17, P<0.05) and the use of vasoactive drugs ( HR=3.66, 95% CI: 1.53-8.75, P<0.05) were independent influencing factors for 28-day death in patients with sepsis. Conclusions:Patients with sepsis and SIC have more severe disease and increased mortality risk. SIC score exhibits good clinical value in predicting the prognosis of patients with sepsis.