BACKGROUND:High liquid-absorbing property, high-capacity imbibition property and high antibacterial property of chitosan dressings can be promoted by chemical modification.
OBJECTIVE:To observe the effect of high-absorbing chitosan dressings on hemostasis and wound healing.
METHODS: (1) Venule bleeding experiment: symmetry oozing wounds were produced on the rabbit skin, which were respectively covered by high-absorbing chitosan dressings and sterile gauze. Then, hemostatic time and bleeding volume were recorded. (2) Deep II degree burn wound healing experiment: 40 Sprague-Dawley rats were selected to prepare deep II degree burn wounds on the back, and then model rats were randomly divided into two groups: experimental group with high-absorbing chitosan dressings and control group with vaseline gauze. After 3, 7, 14, 21 days, wound tissues were taken and analyzed histopathologicaly.
RESULTS AND CONCLUSION: (1) Venule bleeding experiment: The bleeding amount and hemostatic time were significantly lower in the high-absorbing chitosan dressing group than the sterile gauze group (P < 0.05,P < 0.01). (2) Deep II degree burn wound healing experiment: the unhealed wound areas were significantly lower in the experimental group than the control group at days 7, 14, 21 after repair (P < 0.05). After 3 days of wound repair, necrosis of the squamous epithelial layer and the structural damage of the hair folicle in the corium layer and skin appendages were found in both two groups. Meanwhile, the infiltration caused by varying numbers of neutrophils and lymphocytes inside the damaged skin tissues was visible. After 21 days of repair, the epithelium healed wel in the control group, with a little lymphocyte infiltration and formation of crust on the skin surface; while in the experimental group, the epithelium healed wel, with complete squamous epithelial layer and no inflammatory cel infiltration. Thus, these experimental findings reveal that the high-absorbing chitosan dressing has an excelent effect on hemostasis and wound healing.

ObjectiveTo analyze the influence of different anesthesia methods on the stress response and hemodynamic of elderly patients undergoing laparoscopic cholecystectomy(LC).Methods Fifty-eight elderly patients who needed LC were selected and divided by random digits table method into GAEA group received general anesthesia combined with epidural anesthesia and GA group received general anesthesia with 29 cases each.The stress response and changes of hemodynamic were observed.Results Blood pressure and heart rate (HR) were elevated during pneumoperitoneum in both groups.Blood pressure and HR returned to normal at 30 minutes after pneumoperitoneum in GAEA group,which were recovered more slowly in GA group.There was no significant difference in systolic blood pressure (SBP),diastolic blood pressure (DBP),HR between two groups before and after anesthesia (P＞0.05).SBP,DBP,HR of GAEA group were ( 123.8 ± 25.9) mm Hg ( 1 mm Hg =0.133 kPa),(85.9 ± 8.4) mm Hg,(83.2 ± 7.4) times/min during pneumoperitoneum,respectively,(118.2 ±21.1) mm Hg,(84.4 ±8.3) mm Hg,(82.8 ±7.5)times/min at 10 min after pneumoperitoneum,( 114.9 ± 20.7) mm Hg,(80.2 ± 7.6) mm Hg,(78.5 ± 10.4)times/min at 30 min after pneumoperitoneum.SBP,DBP,HR of GA group were (138.3 ±26.7) mm Hg,(91.2 ± 8.8) mm Hg,(89.3 ± 10.1 ) times/min during pneumoperitoneum,( 130.3 ± 21.3) mm Hg,(89.2 ±8.6) mm Hg,(88.2 ± 9.7) times/min at 10 min after pneumoperitoneum,( 126.2 ± 20.7) mm Hg,(85.2 ±8.4) mm Hg,(84.9 ± 9.6 ) times/min at 30 min after pneumoperitoneum,respectively.SBP,DBP,HR during pneumoperitoneum,at 10 min and 30 min after pneumoperitoneum in two groups had significant differences (P ＜0.05).The anesthesia onset time in GAEA group was(73.2 ±24.9) s,and the awake time after operation was (31.6 ± 10.2) min,while those in GA group were (78.1 ± 22.4) s and (35.9 ± 14.3) min.The anesthesia onset time and awake time after operation in GAEA group were shorter than those in GA group,but had no significant difference (P＞ 0.05 ).Postoperative visual analogue score of GAEA group [ ( 13.4 ± 8.2)scores] was obviously lower than that of GA group[(26.3 ± 10.1) scores] (P ＜0.05).The incidence of adverse reactions between GAEA group [27.59％(8/29)] and GA group [6.90％(2/29)] had statistical difference (P ＜ 0.05).ConclusionsCompared with general anesthesia,general anesthesia combined with epidural anesthesia during LC for elderly patients can reduce the occurrence of intraoperative stress responses and have more steady hemodynamic,better anesthetic effect and faster recovery.But it may cause the incidence of nausea,headache and other postoperative adverse reactions increase.

Objective To analyze the performance of adsorbing CO2 with zeolite 5A molecular sieve in crew module. Methods Fitting analysis was based on experimental data of adsorbing CO2,O2 and N2 with zeolite 5A molecular sieve and the suitability of isotherm adsorbing equation of Langmuir,Freundlich and BET models to be conducted with Origin software. Then using obtained equations and competitive adsorbing theory,the adsorbed amounts of these three kinds of gas under competitive condition were calculated. Results The constants in equations for adsorbing CO2,O2 and N2 with zeolite 5A molecular sieve were determined,and adsorbed amounts for above three kinds of gases under competitive condition were calculated. Conclusion The adsorbed CO2 amount is affected by high fraction of N2. Therefore zeolite 5A molecular sieve should be modified technically so that its adsorption in N2 might be reduced to an ignored amount.

[Summary] Thoracic paravertebral block ( TPVB) can offer intra-postoperative analgesia for thoracic , cardiac, and breast operations .In recent years , the development of ultrasonic technology provides a platform for real-time and visual never block , which can further improve the success rate and reduce the incidence of complications .In this article, we reviewed the various approaches of ultrasound guidance for thoracic paravertebral blockade , and explored the latest progress of different technologies .

Objective To explore clinical application of coronary artery imaging with 64-slice spiral CT.Methods 46 patients with coronary heart disease were undergone both coronary artery imaging with 64-slice spiral CT and coronary angiography,and the effects on coronary display respectively were compared Results Coronary display in coronary artery imaging with 64-slice spiral CT was better than that of the coronary angiography, which was a inspection pattern of noninvasive coronary display. Conclusion Coronary artery imaging with 64-slice spiral CT can accurately evaluate coronary artery stenosis, which was worth to application.

Objective To analyze and summarize the clinical , pathological features of 16 patients with centronuclear myopathy.Methods All of the 16 patients performed clinical examination and sporadic patients and a proband with family history ( n=6 ) performed serum creatine kinase , electromyography and open muscle biopsies , and the specimens were used for a standard series of histological and histochemical stainings.The clinical and pathological features of these patients were analyzed.Results The proportion of centronuclear myopathy in suspected myopathy cases was 0.127%(6/4 724) in our department.The onset time ranged from infancy to adulthood.The common initial symptoms included mild to moderate weakness of lower limbs and bilateral ptosis ( n =4 ).The other symptoms were facial weakness ( n =1 ) and ophthalmoplegia (n=1).There were 12 patients performing distal weakness exceeding proximal weakness . One family with autosomal dominant inheritance of 11 patients had a later age of onset than the sporadic ones and manifested bilateral ptosis , bilateral lower limbs weakness , especially in distal muscle.Muscle biopsies showed pronouncedly increased amount of fibers with centrally placed nuclei with predominant type Ⅰfibers and a clear perinuclear halo surrounding the centrally placed nuclei and an appearance of spoke of a wheel in some fibers.Conclusions This series of centronuclear myopathy patients manifest clinical heterogeneity.Muscle biopsies show features of centralized nuclei pronounced increase , type Ⅰfibers predominance , etc.These can provide evidences for the diagnosis of the disease.

Objective To observe the effect of Shenfu injection on fluid intake volume of resuscitation therapy for patients with septic shock. Methods The clinic data of 36 patients with septic shock admitted to Department of Critical Care Medicine of the Affiliated Hospital of Hangzhou Normal University from June 2010 to June 2013 were retrospectively analyzed. All the patients were treated with western conventional medicine. Twenty cases treated with western medicine combined with Shenfu injection (intravenous drip 100 mL once daily, half of a month was a therapeutic course) were defined as Shenfu group; the rest 16 cases treated with western medicine only were assigned as control group. The following data after treatment for 6, 24, and 72 hours in the two groups were compared:liquid intake and urine volumes, system vascular resistance index (SVRI), mean arterial pressure (MAP), cardiac index (CI), and case fatality rate in 28 days. Results There were no significant differences in the liquid intake volume in 6 hours after treatment (mL:3 101±219 vs. 3 329±295, P>0.05), the urine volumes in 6, 24 and 72 hours after treatment (mL, 6 hours:701±229 vs. 651±292, 24 hours:1 870±566 vs. 1 697±618, 72 hours:7 396±2 546 vs. 5 987±2 497), and the levels of SVRI in 24 hours after treatment between Shenfu group and control group (kPa·s·L-1·m-2:802±158 vs. 741±106, all P>0.05). The total liquid intake volumes (mL) in 24 hours and 72 hours after treatment in Shenfu group were significantly less than those in the control group (24 hours:4 544±425 vs. 4 996±396, 72 hours:10 985±891 vs. 11 612±807, both P<0.05). The SVRI, MAP, and CI in 72 hours of Shenfu group were significantly higher than those of control group [SVRI (kPa·s·L-1·m-2): 1 361±182 vs. 1 163±183, MAP (mmHg, 1 mmHg = 0.133 kPa): 76.2±6.1 vs. 71.8±6.3, CI (mL·s-1·m-2):76.2±7.5 vs. 70.8±7.2, all P<0.05], and the 28-day mortality rate in Shenfu group was significantly lower than that of control group [25.0%(5/20) vs. 62.5%(10/16), P<0.05]. Conclusion The application of Shenfu injection was favorable to the reduction of liquid intake volume in 72 hours after treatment that may be beneficial to the fluid limitation management in the course of treatment for septic shock.

Objective:To study the spinal cord injury, spinal cord transection and persistent placeholder damage on the influence of secondary neural cell apoptosis in rats.Methods: Select 60 healthy male Wistar rats, numbered after using the random number table method is divided into A (18,spinal cord contusion),B (18,spinal cord transection),C (18,continuous placeholder),D (6,control),E (6,the control group only) groups of five,were observed at the 1,4,7 D after 5 group of rats nerve cell apoptosis index, spinal cord tissue Bcl-2,the expression of Bax,caspase 3 protein.Results:A,B,C three groups of rats after building 1 d are gray and white matter positive markers, and the gray matter and white matter of three groups of rats nerve cell apoptosis index differences statistically significant ( P<0.05);4 d,7 d after building gray matter and white matter of three groups of rats tend to place increased ap-optotic cells in the spinal cord index ( P<0.05);in building 1,4,7 d group C after rat spinal cord grey matter and white matter of apoptotic cell index was significantly higher than that of group A and group B, group B were significantly higher in group A and the differences were statistically significant (P<0.05).1,4,7 d after building A,B,C,D,E five group rats the Bcl-2,Bax,caspase-3 protein expression differences were statistically significant (P<0.05),1,4,7 d after building A,B,C the Bcl-2 of three groups of rats, Bax,caspase-3 protein expression was significantly higher than that of group D and group E ( P<0.05).Conclusion: Secondary rats after spinal cord injury of nerve cells apoptosis,apoptosis time,severity,and damage type and severity.

Aqueous two phase system(ATPS) provides a gentle, non-denaturing separation environment for proteins, enzymes. While high-speed countercurrent chromatography (HSCCC) is a liquid-liquid partition chromatography which uses centrifugal force to hold the stationary phase and facilities the mobile phase partitioning through the stationary phase, it can produce high separation efficiency with large sample loading capacity. However, the ordinary HSCCC apparatus (Type J ) fails to retention a satisfactory stationary phase of ATPS because of its high viscosity and low interfacial tension. Nevertheless, the later designed cross-axis planetary centrifuge system(X-CPC) can produce a greater lateral force field and enhances significantly the retention of the ATPS stationary phase. A review of the application of these CCC techniques with ATPS in the separation of proteins was given. Meanwhile, new techniques such as pH-peak focusing CCC and dye-ligand affinity CCC and some new CCC column design for improvement of separation efficiency and retention of ATPS stationary phase are introduced.

PurposeTo investigate the image quality of Dual Source CT (DSCT) high pitch prospective scan in acute chest pain examination by using triple-rule-out (TRO) protocol and its responses to heart beat rate change.Materials and Methods Thirty-two consecutive patients who planned to undergo TRO acute chest pain examination were enrolled and randomly divided into research group and control group. The conventional retrospective spiral scanning protocol was applied to the patients in the control group, while the high pitch prospective spiral scanning mode was used in the research group. CT value, noise level, SNR, CNR and radiation dosage in aorta and pulmonary arteries were recorded and compared between the two groups, and the image quality of the coronary arteries was scored subjectively.Results No significant difference was found in the aspects such as CT value, noise level, SNR, CNR radiation dosage in aorta and pulmonary arteries (P>0.05); however, the subjective scoring for coronary artery in the research group (85.5%) was significantly lower than that in the control group (93.9%) (χ2=8.33,P<0.05). Considering the influence of severe heart rate changes, we excluded those patients whose heart rate variance was more than 5 beats/min (control group:n=5; research group:n=4) and then compared the image quality of the two groups again. The subsequent results showed no difference (χ2=0.12,P>0.05). In addition, the radiation dosage in the control group was significantly higher than that in the research group [(20.8±6.2) mSvvs. (2.3±0.4) mSv;t=17.142,P<0.01].Conclusion DSCT high pitch prospective scanning in TRO protocol shows high success rate in examining patients with acute chest pain whose heart beat rate is lower than 80 beats/min and heart beat variance is less than 5 beats/min. The image quality has no difference with that derived from retrospective scan but with far more less radiation dose (2.3±0.4) mSv. This method thus is promising and can be widely promoted clinically.