Objective To investigate the effects of celecoxib-poly lactide-co-glycolide microparticles (CEL-PLGA-MS) on rat retina after intravitreal injection. Methods A total of 32 male Brown Norway rats were randomly divided into CEL-PLGA-MS group and celecoxib group, 16 rats in each group. The rats in CEL-PLGA-MS group were divided into four dosage group, four rats in each group, which received intravitreal injection of PLGA with celecoxib at the concentration of 40, 80, 160, 320 mu;mol/L, respectively. The rats in celecoxib group were divided into four dosage group, four rats in each group, which received intravitreal injection of celecoxib at the concentration of 40, 80, 160, 320 mu;mol/L, respectively. Phosphate buffer solution (PBS) was injected in two rats as PBS control group. Two rats as normal control group received no treatment. The difference of retinal thickness among groups was measured by optical coherence tomography (OCT). The morphological and histological change of retina was evaluated under light microscope and transmission electron microscope. Results There was no difference of retinal thickness between normal control group and PBS control group (F=0.12,P＞0.05). At the first week after injection, the retinal thickness of CEL-PLGA-MS group and celecoxib group were thicker than that in normal control group and PBS control group (F=9.62, 46.13;P＜0.01). The retinal thickness of celecoxib group was thicker than that in CEL-PLGA-MS group (F=165.15,P＜0.01). The retinal thickness was estimated equal among 40, 80, 320 mu;mol/L dosage groups in CEL-PLGA-MS group (F=4.79,P＜0.01). The retinal thickness of 160, 320 mu;mol/L dosage group were thicker than that in 40, 80 mu;mol/L dosage group in celecoxib group (F=28.10,P＜0.01). At the second week after injection, there was no difference of retinal thickness between CEL-PLGA-MS and celecoxib group (F=3.79,P＞0.05); the retinal thickness of CEL-PLGA-MS and celecoxib group became thinner gradually compare to the first week after injection (F=7.28, 103.99; P＜0.01). At the fourth week after injection, the retinal thickness of celecoxib group was thicker than that in CEL-PLGA-MS group (F=19.11,P＜0.01). The retinal thickness of CEL-PLGA-MS group was approximately the same to normal control group and PBS control group (F=2.02,P＞0.05). The retinal thickness of celecoxib group was thicker than that in normal control group and PBS control group. No considerable abnormality of the retina was seen by light microscope and the retinal thickness corresponded with the values measured by OCT at the first week after injection. The abnormal structures of the retina were seen in 160, 320 mu;mol/L dosage group of celecoxib group and inner changed evidently by the transmission electron microscope. Disordered arrangement of microfilaments, dilated microtubule and some mitochondria vacuolation were observed in 320mu;mol/L dosage group of celecoxib group. Others changed slightly. Conclusions CEL-PLGA-MS has less toxicity on the retina than free-celecoxib after intravitreal injection. The safety of intravitreal injection with CEL-PLGA-MS is better than celecoxib.
Objective Isoflurane has an acute preconditioning effectiveness against ischemia in kidney, but this beneficial effectiveness can only last for 2-3 hours. To investigate whether isoflurane produces delayed preconditioningagainst renal ischemia/reperfusion (I/R) injury, and whether this process is mediated by hypoxia inducible factor 1α(HIF- 1α). Methods A total of 52 male C57BL/6 mice were randomly assigned to 4 groups (n=13 in each group): the controlgroup (group A), PBS/isoflurane treated group (group B), scrambled small interference RNA (siRNA)/isoflurane treated group (group C), and HIF-1α siRNA/isoflurane treated group (group D). In groups C and D, 1 mL RNase-free PBS containing 50 μg scrambled siRNA or HIF-1α siRNA was administered via tail vein 24 hours before gas exposure, respectively. Equivalent RNasefree PBS was given in groups A and B. Then the mice in groups B, C, and D were exposed to 1.5% isoflurne and 25%O2 for 2 hours; while the mice in group A received 25%O2 for 2 hours. After 24 hours, 5 mice in each group were sacrificed to assesse the expressions of HIF-1α and erythropoietin (EPO) in renal cortex by Western blot. Renal I/R injury was induced with bilateral renal pedicle occlusion for 25 minutes followed by 24 hours reperfusion on the other 8 mice. At the end of reperfusion, the serum creatinine (SCr), the blood urea nitrogen (BUN), and the histological grading were measured. Results The expressions of HIF-1α and EPO in groups B and C were significantly higher than those in group A (P lt; 0.01). The concentrations of SCr and BUN in groups B and C were significantly lower than those in group A, as well as the scores of tubules (P lt; 0.01), and the injury of kidney was amel iorated noticeably in groups B and C. The expressions of HIF-1α and the concentrations of SCr and BUN in group D were significantly lower than those in group A (P lt; 0.01). Compared with groups B and C, the expression of HIF- 1α and EPO in group D decreased markedly (P lt; 0.01), the concentrations of SCr and BUN were increased obviously, as well asthe scores of tubules (P lt; 0.01), and the renal injury was aggratived significantly. Conclusion Isoflurane produces delayed preconditioning against renal I/R injury, and this beneficial effectiveness may be mediated by HIF-1α.
Objective To determine risk factors of delayed recovery of consciousness after aortic arch surgery underdeep hypothermic circulatory arrest （DHCA） and antegrade selective cerebral perfusion （ASCP）. Methods We retrospectively analyzed clinical data of 113 patients who underwent aortic arch surgery under DHCA＋ASCP in the Affiliated Drum Tower Hospital， Medical School of Nanjing University from October 2004 to April 2012. According to whether they regained consciousness within 24 hours after surgery， all the 113 patients were divided into normal group （73 patients including 55 males and 18 females with their average age of 48.1±10.9 years） and delayed recovery group （40 patients including 29 males and 11 females with their average age of 52.2±11.4 years）. Risk factors of delayed recovery of consciousness after surgery were evaluated by univariate analysis and multivariate logistic regression analysis. Results Nine patients （8.0%） died postoperatively， including 5 patients with multi-organ failure， 2 patients with heart failure， 1 patient with mediastinal infection， and 1 patient with pulmonary hemorrhage. There were 7 deaths （17.5%） in the delayed recovery group and 2 deaths （2.7%） in the normal group， and the in-hospital mortality of the delayed recovery group was significantly higher than that of the normal group （P=0.016）. A total of 94 patients （including 65 patients in the normal group and 29 patients in the delayed recovery group） were followed up for 4-95 months. Eight patients （including 5 patients in the normal group and 3 patients in the delayed recovery group） died during follow-up， including 2 patients with stroke， 3 patients with heart failure， 2 patients with pulmonary hemorrhage and 1 patient with unknown cause. Ten patients were lost during follow-up. Univariate analysis showed that age （P=0.042）， hypertension （P=0.017）， emergency surgery （P=0.001）， cardiopu- lmonary bypass （CPB） time （P=0.007）， aortic cross-clamp time （P=0.021）， and blood transfusion（P=0.012）were risk factors of delayed recovery of consciousness after aortic arch surgery. Multivariate logistic regression showed that emergency surgery （P=0.005） and CPB time＞240 minutes （P=0.000） were independent risk factors of delayed recovery of consciousness after aortic arch surgery. Conclusion Delayed recovery of consciousness after aortic arch surgery is attributed to a combination of many risk factors. Correct patient diagnosis， lesion site and involved scope should be made clear preoperatively in order to choose appropriate surgical strategies. During the surgery， strengthened brain protection， shortened operation time， improved surgical techniques， and perioperative stable circulation maintenance are all important measures to prevent delayed recovery of consciousness after aortic arch surgery.
The Diagnosis and treatment of gastroesophageal reflux(GER)was made in 33 infants and young children with severe symptoms in authors hospital during the past 22 years. The age ranged from 40 days to 5.5 years old. 30 cases had accompanied hiatus hernia and 4 had presented with delayed gastric emptying (DGE). The diagnostic methods included barium esophagograms, ultrasonogram, esophageal manometry, gastroesophageal scintiscan and esophagoscopy. 29 patients were treated operatively and 21 cases were operated during the last 4 years.Of 21 cases, thegastroesophageal fundoplication and pyloroplasty were 19 and 2 respectively. Operative results were satisfactory. The experiences with 3 patients investigations is valuable for diagosis, and the gastroesophageal fundoplication is an effective antireflux operation and can be used in pediatric patient with GER.
Delayed encephalopathy due to acute carbon monoxide poisoning (DEACMP) is a serious complication of acute carbon monoxide poisoning. Patients with DEACMP often present with cognitive impairment, abnormal mental behavior, extrapyramidal system symptoms, pyramidal system symptoms, and may also have focal cortical dysfunction, which is closely related to the poor prognosis of the patients. Current research shows that the occurrence of DEACMP is related to multiple factors such as immune disorders, and glucocorticoids can exert certain therapeutic effects by suppressing the immune system. This article reviews the risk factors of DEACMP, the clinical research progress and possible mechanisms of glucocorticoid treatment for DEACMP, providing more references for the clinical treatment of DEACMP.
ObjectivesTo analyze the economic burden caused by delay in the diagnosis and treatment of diabetes.MethodsThe employee/non-employee health insurance and medical examination data from Japan Medical Data Center (JMDC) and Milliman Inc. were used to analyze the health economic burden of the situation in case the diabetic population receives timelydiagnosis and treatment with real world data.ResultsThe overall population delaying the diabetes diagnosis and treatment in Japan was estimated to be 916 000, and the average time of delay was 39.6 months. The increase in time of delay was related with the increase in monthly medical costs after diabetes diagnosis. If the whole delayed population could receive timely diagnosis and treatment, it can totally save about 38.24 billion yuan (1.5% of the annual Japanese national medical expenditure.ConclusionsThe current study suggests a huge potential health economic burden that can be improved by promoting the diagnosis and treatment of diabetes, which provides reference for the economic evaluation of similar health policies and also the application of real world data in China in future.
The human sclera accounts for 95% of the surface of the eyeball, providing ample contact area which is suitable for targeted trans-scleral ocular drug delivery. Currently there are several tans-scleral sustained-release strategies, including intra-scleral delivery, episcleral delivery, as well as tans-scleral iontophoresis. Different devices and methods have their own advantages and disadvantages, for example, intra-scleral delivery is somehow invasive, and episcleral delivery device needs to be made thin to prevent erosion of conjunctiva, iontophoresis needs to be frequently repeated as of its short-term effect. With the development of bio-material engineering technology, episcleral microfilm could become an ideal drug delivery route for posterior segment ocular diseases.
Acute carbon monoxide poisoning is a common and frequently occurring disease in winter and spring in China, with high disability and mortality. Delayed encephalopathy is a serious sequela after the pseudo-convalescence. Its mechanism is complex, including environmental and genetic factors, hypoxia and energy metabolism disorder, cytotoxicity and oxygen free radical damage, immune disorder and inflammatory activation, neurotransmitter disorder, brain parenchymal changes, vascular and hemorheological abnormalities, calcium overload, and cell apoptosis. At present, methods for predicting delayed encephalopathy in acute carbon monoxide poisoning include detailed inquiry of medical history, laboratory examination of relevant indicators, electrophysiological examination, brain imaging examination, and evaluation scale prediction. This review summarizes the research status of the pathogenesis and early prediction methods of delayed encephalopathy in acute carbon monoxide poisoning, with a view to providing reference for future research directions.
Abstract A doublepediculated randomized flap parallal to the longitudinal axis of the extremity was designed. The skin and the subcutaneous tissue superficial to the deep fascia was incised on both sides of the axis of the flap. The subcutaneous tissue was separated from the deep fascia. The two ends of the flap should not be incised, thus a bipolar doulepediculated flap was formed. A silicone membrane was placed under the flap toobstruct the blood supply of the flap partially so that the delay effect was created. After 10～14 days, one end of the pedicles was divided so thata pediculated superlong randomized flap was formed. The flap was transferred to cover the wound on the recipient area. The wound on the donor site was closed directly or covered by split skin graft. From Janurary 1991 to July 1994,this technique was used in 8 patients (male 6, female 2). The age averaged 30 years old. These cases included 5 cases of fracture complicated with skin defect or scar on leg and 3 cases of crashing injury of the lower extremity. The length and width of the flap and the width of the pedicle ranged from 20cm×7cm×4cm to 29cm×10cm×3cm respectively. The flaps were completely survived after operation. The wound and the exposed deep tissues such as bone, tendon, nerve and vessels were covered and repaired. As a consequence that the pediculated superlong randomized flap was effective in repairing soft tissue defect.
ObjectiveTo analysis the reasons of delayed discharge in day surgery ward, so as to provide the basis for discharged quality monitoring of ambulatory surgery management. MethodsA retrospective survey was conducted on patients admitted in Department of Day Surgery Center of West China Hospital of Sichuan University from April 2012 to August 2014 after day surgery. The characteristics of patients classified as "delayed discharge patients" were described and the factors associated with delayed discharges were analyzed by using SPSS 19.0 software. ResultsA total of 14 560 patients were included, of which 81 patients were classified as "delayed discharge", and the rate of delayed discharge was 0.56% (81/14 560). Single disease delayed discharge rates were as follows: gallstone 2.13% (37/1 737), operation for varicose veins of lower limbs 1.91% (11/576), gastrointestinal polyps resection 0.33% (11/3 325), inguinal herniorrhaphy 0.63% (9/1 424), polyp of vocal cord resection 0.21% (4/1 879), breast package block minimally invasive resection 0.11% (2/1 761), choledochoscopy 0.06% (1/1 563) and other surgical 0.26% (6/2 295). No significant differences were found between the delayed discharge patients and normal discharge patients in age and gender (P>0.05). Compared with the normal discharge patients, there were significant differences in the four aspects of operation mode changes, postoperative complications, anesthesia factors and patient's own factors of delayed discharge patients (P<0.05). ConclusionThe changes of operation mode, postoperative complications, anesthesia factors and patient's own factors are related to the delay of hospital discharge. Strictly grasping the indications for ambulatory surgery and anesthesia patients, strengthening the admission education, letting the patients accept day surgery fully in psychological and preventing the possible complications and ensure the quality and safety after day surgery.