Objective Glucocorticoid is the main cause of non-traumatic avascular necrosis of femoral head. To explore the changes of reactive oxygen species (ROS) in the bone microvascular endothel ial cells treated with glucocorticoid so as to investigate the pathogenesis of steroid-induced avascular necrosis of femoral head. Methods The cancellous bone of femoral head was harvested from voluntary donators undergoing total hip arthroplasty, and then the bone microvascular endothel ial cells were isolated by enzyme digestion. The cells at passage 3 were cocultured with different concentrations of hydrocortisone (0, 0.03, 0.10, 0.30, and 1.00 mg/mL) for 24 hours. MTT assay was used for the inhibitory rate of cell prol iferation, flow cytometry for apoptosis rate, and fluorescence probe for the production of ROS and xanthine oxidase (XOD). Results At 2-3 days primary culture, the cells were spindle and arranged l ike cobbles and they reached confluence after 1 week. The inhibitory rates of cell prol iferation in 0.03, 0.10, 0.30, and 1.00 mg/mL groups were 20.22% ± 2.97%, 22.94% ± 4.52%, 43.98% ± 3.35%, and 78.29% ± 3.85%, respectively; and 2 high-concentration groups (0.30 and 1.00 mg/mL groups) were significantly higher (P lt; 0.05) than 2 low-concentration groups (0.03 and 0.10 mg/mL groups). The apoptosis rates in 0, 0.03, 0.10, 0.30, and 1.00 mg/mL groups were 0.10% ± 0.01%, 0.23% ± 0.02%, 1.83% ± 0.04%, 6.34% ± 0.11%, and 15.33% ± 0.53%, respectively; 2 high-concentration groups (0.30 and 1.00 mg/mL groups) were significantly higher (P lt; 0.05) than 0 mg/mL group. In 0, 0.30, and 1.00 mg/ mL groups, the ROS levels were 57.35 ± 7.11, 120.47 ± 15.68, and 166.15 ± 11.57, respectively, and the XOD levels were 0.017 9 ± 0.000 9, 0.028 3 ± 0.001 7, and 0.067 7 ± 0.004 1, respectively; there were significant differences in the levels of ROS and XOD among 3 groups (P lt; 0.05). Conclusion Increasing of ROS production in bone microvascular endothel ial cells can be induced by high concentration glucocorticoid, and it can result in cell injury
ObjectiveTo analyze the trend of hospital infection, so as to provide a scientific basis for hospital infection prevention and control. MethodsFrom 2011 to 2013, according to the criteria of diagnosis of nosocomial infections set up by the Ministry of Health, the prevalence rates of nosocomial infections in patients who were hospitalized on the survey day were investigated by the combination of bedside investigation and medical records checking. ResultsThe incidence rates of nosocomial infections from 2011 to 2013 were 2.99%, 2.31% and 1.95%, respectively, presenting a downward trend. The rate of hospital infection was the highest in comprehensive Intensive Care Unit, and the main infection site was the lower respiratory tract. Gram-negative bacteria were the main pathogens causing hospital infections, including Klebliella pnermoniae, Pseudomonas aeruginosa, Staphylococcus aureus, Acinetobacter baumannii and Escherichia coli. The utilization rates of antibacterial agents in these three years were respectively 39.84%, 34.58% and 34.22%. ConclusionTargeted surveillance and management of key departments and sites should be strengthened. It is necessary to strengthen the surveillance and management of antibiotics, raise the submission rate of pathogens, and use antibiotics appropriately.
Immune-mediated necrotizing myopathy (IMNM) is a type of autoimmune myopathy characterized by relatively severe proximal weakness with high serum muscle enzyme levels, myofiber necrosis with minimal inflammatory cell infiltrate on muscle biopsy, and infrequent extra-muscular involvement. The mechanism of necrotizing myopathy remains unclear. The new European Neuromuscular Centre criteria divides IMNM into three distinct subtypes according to different autoantibodies, which reminds us antibodies may be involved in the pathogenesis of IMNM and different subtypes may have different pathogenesis. This review summarizes the current understanding of the pathogenesis of IMNM.
ObjectiveTo research on the types of pathogenic bacteria in wound infection and analyze the effectiveness of long-term use of nano-silver dressing in the treatment of pressure ulcers, in order to provide references for the management of pressure ulcer wound. MethodsFifty-five patients (60 wounds) with stage Ⅲ-Ⅳ pressure ulcer wound treated in all departments between September 2011 and August 2015 were chosen to be our study subjects. Under overall intervention, all the wounds were assessed by the same method, cleansed and debrided, after which nano-silver antimicrobial dressing was used to intervene until the wound healed or the end of 8 weeks. The wounds which were not healed were treated with wet dressing therapy until wound healing. The detection rate of pathogenic bacteria before intervention and 2, 4 and 8 weeks after intervention, change of pressure ulcer healing score and the rate of wound healing were observed. ResultsBefore the intervention, 12 kinds of pathogenic bacteria were detected, including mainly Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, and coagulase negative Staphylococci. The detection rate of pathogenic bacteria was 92.73% (51/55). With the use of nano-silver dressing during different time periods, the detection rate of pathogenic bacteria and the total score of pressure ulcer were lowered by varying degrees (P<0.01). Four and 8 weeks after intervention, wound bed improved significantly and the detection rate of pathogenic bacteria decreased faster. The healing rate during the intervention period was 23.64% (13/55). ConclusionThe incidence of pressure ulcer wound infection is high. The use of nano-silver wound dressing can effectively remove pathogenic bacteria and promote wound healing.
ObjectiveTo analyze the clinical characteristics and pathogenesis in patients with chronic obstructive pulmonary disease (COPD) with ventilator-associated pneumonia (VAP). MethodsNinety-two patients with VAP who underwent mechanical ventilation via tracheal incubation due to COPD and respiratory failure were recruited in the study.The clinical characteristics,bacterial culture and antibiotics sensitivity of specimen from tracheal secretion and bronchoalveolar lavage fluid were retrospectively analyzed. ResultsThe main pathogenic bacteria in the patients with COPD with VAP were as following,ie. Ainetobacter baumanii(24.1%),Pseudomonas aeruginosa (17.6%),Klebsiella spp (15.9%),Methicillin-resistant Staphylococcus aureus(14.7%),and Escherichia coli(10.6%) in which Gram negative bacteria were predominant. When compared with the patients who received antibiotics before mechanical ventilation,the mortality in the patients who did not receive antibiotics before mechanical ventilation was significantly lower (17.9% vs. 40.6%,P<0.01). The patients who received de-escalation antibiotics therapy had lower mortality than those who received escalation antibiotics therapy(19.3% vs. 57.1%,P<0.01). There was no significant difference in mortality between the patients who suffered from VAP less or more than 4 days after mechanical ventilation (54.8% vs. 45.2%,P>0.05). ConclusionsHigh drug resistant rate is observed in patients with COPD and VAP especially in those patients who using antibiotic before mechanical ventilation. De-escalation antibiotics therapy can lower the mortality. The mortality rate is not significant different between early-onset and late-onset VAP in patients with COPD.
With the surged prevalence of myopia, the pathogenic mechanism underlying myopia has attracted attention. At present, it is generally believed in the flied that the reduced blood perfusion in the choroid is crucial for myopigenesis. Then, in the process of myopigenesis, how are the blurred visual signals transmitted to the choroidal blood vessels through the retina and retinal pigment epithelium, leading to the reduced choroidal blood perfusion. The cellular and molecular mechanisms underpinning this process remain elusive. In recent years, the theory of scleral hypoxia has attracted much attention. Popular signaling molecules in current research include dopamine, epidermal growth factor, retinoic acid, cholinergic molecules and adenosine, etc. These factors are likely to participate in signal transduction in retina and RPE, thus causing changes in choroidal blood flow and affecting the occurrence and development of myopia. Therefore, these signaling factors and their downstream pathways may provide new ideas for the prevention and control of myopia targets.
Objective To study the etiology， pathogenesis， and diagnosis of small bowel volvulus in adults. Method The clinical data of 43 cases of small bowel volvulus admitted to HassanⅡHospital of Settat from October 2009 to October 2012 were analyzed retrospectively. Results There were 11 cases of spontaneous small bowel volvulus.There were 32 cases of secondary small bowel volvulus， of which 19 cases due to postoperative abdominal adhesions. Clinical manifestation：early persistent severe abdominal pain was in 40 cases， frequent vomiting was in 29 cases， intestinalpattern or abdominal mass was in 28 cases. All 43 patients were received surgery， 22 （51.2%） cases were diagnosed by preoperative ultrasonography， small bowel necrosis was found in 16 cases during operation， 37 （86.0%） patients were cured and 6 （14.0%） patients died. Conclusions Secondary small bowel volvulus is main small bowel volvulus， post-operative abdominal adhesion is major causes of small bowel volvulus， the value of abdominal X-ray in diagnosing is limited. However， ultrasonography and CT are helpful in diagnosing these diseases. Small bowel volvulus and intestinal obstruction can reinforce each other. Early small bowel volvulus is characterized by clinical conditions such as severe abdominal pain， early vomiting signs， and signs not matching the symptoms. Acute onset and rapid progression are the features of small bowel volvulus， surgery should be intervened in early stage.
Objective To study the preventive measure of the subambient temperature burn by analysing the pathogenesis feature. Methods The cl inical data were analysed from 351 cases of subambient temperature burn between February 2004 and February 2009, including age, sex, burn season, burn factors, burn position, burn area, burn degree, treatment way, and wound heal ing. Results Subambient temperature burn occurred in every age stage. The susceptible age stages included infant, children, and the elderly. Female patients were more than male patients. The common burn reasons werehot-water bottle burn, honey warm keeper burn, and heating device burn. The peak season was winter. Lower l imb was the most common site of the subambient temperature burn. The deep II degree to III degree were the most common level, and the burn area was always small, often 1% of total body surface area. Most of patients were treated with changing dressings at cl inic and few patients needed hospital ization. Though the surface of wound could heal finally, and the wound healed well with no obvious scar in patients who received operation. Conclusion Subambient temperature burn is the frequently encountered disease in winter. Use of the warming articles should be cautious, at the same time safety awareness should be strengthened so as to decrease the incidence rate of subambient temperature burn and the injury degree.
Objective To review the research progress of alcohol-induced osteonecrosis of the femoral head (ONFH). Methods Recent literature concerning alcohol-induced ONFH was reviewed and summarized. Results Alcohol-induced ONFH accounte for approximately 1/3 of total ONFH. Alcohol intake and the incidence of ONFH has a significant dose-effect relationship. There are some correlations between alcohol-induced ONFH and lipid metabolism, secretion of corticosteroid, and some gene of alcohol or lipid metabolism. Conclusion The relationships between alcohol and lipid metabolism, and between alcohol and steroid are still the main direction of the research of ONFH. Gene level researches can not demonstrate the pathogenesis, therefore further research should be carried on.
Objective To analyze the species distribution and resistance of the pathogens isolated fromblood cultures of the patients in intensive care unit ( ICU) , and provide a basis for prevention and control of bloodstream infections in critically ill patients. Methods The data of blood cultures of the patients in ICUduring January 2009 to December 2011 was investigated retrospectively.Results In the last 3 years, positive rate of blood cultures of ICU patients was 15. 4% , 15. 7% , and 17. 6% respectively. Among the isolates, Gram-positive bacteria were predominant ( 52. 3% ) , followed in order by gram-negative bacteria ( 33. 1% ) and fungi ( 14. 7% ) . Aerobe and facultative anaerobe were the predominant bacterial isolates ( 99. 7% ) . Enterococcus faeciumand Staphylococcus spp. were the most common gram-positive bacteria, and 4. 5% of E. faecium isolates were resistant to vancomycin. Rate of methicillin-resistance for S. aureus and S. epidermidis was 73. 5% and 93. 7% respectively. In terms of gram-negative bacteria, Acinetobacter calcoaceticus- A. baumannii complex were the leading species, 96. 9% of the isolates had multi-drug resistance and 14. 1% of the isolates had extra-drug resistance. Klebsiella pneumonia and Escherichia coli isolates were less frequently isolated and those producing extended spectrum beta-lactamases accou ted for 70. 3% and 80. 0% of the isolates respectively. Candida spp. was the most common fungi isolates ( 96. 7% )with an annual change of species distribution and declining susceptibility to azoles.Conclusions Gram-positive bacteria should be the major target for prevention and control of bloodstream infections in critically ill patients. Whereas, more attention should be paid to the infection caused by candida spp. and multidrug resistant gram-negative bacteria.