Cardiac arrest (CA) is a critical condition in the field of cardiovascular medicine. Despite successful resuscitation, patients continue to have a high mortality rate, largely due to post CA syndrome (PCAS). However, the injury and pathophysiological mechanisms underlying PCAS remain unclear. Experimental animal models are valuable tools for exploring the etiology, pathogenesis, and potential interventions for CA and PCAS. Current CA animal models include electrical induction of ventricular fibrillation (VF), myocardial infarction, high potassium, asphyxia, and hemorrhagic shock. Although these models do not fully replicate the complexity of clinical CA, the mechanistic insights they provide remain highly relevant, including post-CA brain injury (PCABI), post-CA myocardial dysfunction (PAMD), systemic ischaemia/reperfusion injury (IRI), and the persistent precipitating pathology. Summarizing the methods of establishing CA models, the challenges encountered in the modeling process, and the mechanisms of PCAS can provide a foundation for developing standardized CA modeling protocols.
Animals ; Disease Models, Animal ; Post-Cardiac Arrest Syndrome/physiopathology* ; Heart Arrest/physiopathology* ; Humans ; Ventricular Fibrillation/complications*

The emergence of the anti-tumor necrosis factor alpha(anti-TNF-α)therapies has brought lots of benefits to patients with inflammatory bowel disease(IBD).However,controversies exist over whether anti-TNF-α could be used for Crohn's disease(CD)patients with intestinal stricture.Some articles found stricturing CD patients under anti-TNF therapy had a high risk of intestinal obstruction or even perforation while others found that there was no association between anti-TNF-α and intestinal obstruction.The fundamental cause lies in that anti-TNF-α only target at inflammation,but cannot be resistant to intestinal fibrosis or change long term outcome.To avoid and prevent intestinal obstruction or perforation,authors should evaluate the component and type of intestinal stricture cautiously before starting anti-TNF-α therapy.Exploring new specific antifibrotic therapy will be a promising way for all stricturing CD patients.

Objective To investigate the impact of intraoperative intra-abdominal pressure increasing on digestive system.Methods A retrospective analysis of clinical data of 132 cases of colorectal cancer patients from January 2013 to June 2016 was made. Patients were divided into groups A, B and C according to the intra-abdominal pressure, 46 cases in each group. Group A: 46 patients, 10 mmHg (1 mmHg = 0.133 kPa), group B: 45 patients, 12 mmHg, group C: 41 patients, 15mmHg. Comparison of postoperative recovery time, complications, serum cytokine levels was made among the three groups.ResultsThe number of postoperative 6h nasogastric tube pulled out, bowel recovery time, ifrst lfatus or a bowel movement, tolerance semi-liquid diet, postoperative duration of diarrhea, postoperative hospitalization time among the three groups show no statistically difference (P > 0.05). The difference of acute gastric injury (AGI), chyle leakage, anastomotic fistula, surgical bleeding, intestinal paralysis, vomiting incidence of postoperative among the three groups has no statistically differences (P > 0.05). While postoperative IL-6 level and MAP were signiifcantly increased compare with preoperative level, the difference was statistically signiifcant (P < 0.05). Postoperative TNF-α show no statistical differences compare with preoperative (P > 0.05). Postoperative serum IL-6 levels in 25 patients with intestinal paralysis was (10.71 ± 4.37) ng/L, 107 cases had high serum IL-6 levels in patients did not occur intestinal paralysis was (10.66 ± 4.13) ng/L, the difference was not statistically significance (P > 0.05).Conclusion Intra-abdominal pressure increasing during minimally invasive surgical procedure has no signiifcant effect on the digestive system in colorectal cancer patients.

Objective To study the influence of cochlear implantation on residual hearing in children .Methods Behavioral audiometry were performed pre -implant and 3~21 months post -implant on thirty -four cochlear implant recipients with severe to profound hearing loss .According to follow -up time ,they were divided into 2 groups which were Group A(3~12 months ,21 cases) and Group B(≥13 months ,13 cases) .The thresholds at 250 Hz ,500 Hz ,1 000 Hz and 2 000 Hz were analyzed .Results There were 25 out of 34 patients (73 .53% ) had partial residual hearing after cochlear implantation .Comparing to the hearing loss pre -operation and post -operation , which were most obvious at 500 Hz ,followed by 250 Hz ,1 000 Hz ,2 000 Hz (P<0 .05) ,and there were significant different among different frequencies .There was significant difference at different frequencies at hearing loss thresh-olds only in Group A .But there was no significant difference in Group B .With the prolonged time after the cochlear implantation ,residual hearing at all frequencies showed a trend of recovery .Conclusion The residual hearing could be partial preserved after cochlear implant in pediatric patients with severe to profound hearing impaired ,the residu-al hearing at lower frequencies (250 Hz ,500 Hz) were less affected than those at higher frequencies .With the pro-longed time after the cochlear implantation ,the residual hearing showed a certain degree of recovery .

Objective To know the position and shape of implanted electrode array with plain X-ray after cochlear implantation. Methods According to the Cochlear View developed by Xu plain X-ray was taken postoperatively to obtain the best view of electrode array. Results The Medical imaging of plain X- ray taken before switching on or following the concerning of the performance could assist in the detection of electrode arrays in improper position, partial insertion or bending inside the cochlea. It helped audiologists to make decisions to switch off affected electrodes for the optimization of the program, if functioning electrodes were insufficient and recipients failed. Conclusion It is recommended to conduct post-operative X-ray examination routinely for cochlear implant recipients. Audiologists should be able to use medical imaging to identify the position of intra-cochlear electrodes and apply the information to guide the mapping work.

OBJECTIVE To study the effect of fluoroquinolones on the level of transcription of norA gene in Staphylococcus aureus(SAU).METHODS The accumulation of fluoroquinolones in SAUz and its induced resistant strain(SAUz-16) and the effect of carbonyl cyanide m-chlorophenylhydrazone(CCCP) on accumulation were studied by fluorescence measured method.The level of transcription of norA gene was studied by slot blot hybridization.RESULTS The steady-state accumulation of SAUz-16 was lower than that of its parent(SAUz).The accumulation of hydrophilic fluoroquinolones in SAUz-16 increased obviously when CCCP was added,but it is lower than that of SAUz.The level of transcription of norA gene in SAUz-16 was higher than that of SAUz.CONCLUSIONS Fluoroquinolones can increase the level of transcription of norA gene.The increase in efflux of hydrophilic fluoroquinolones resulted from the increase in transcription of norA gene is one of causes of decrease in the accumulation of drugs in S.aureus.

Objective　To study the role of exogenous myelin basic protein(MBP) in neural repairment. Methods　Adult New Zealand rabbits were employed in vivo preparation. A 12 μL nerve growth chamber was created by suturing the proximal and distal stumps of a transected facial never (FN) trunk into a tube. The regenerated nerves within the chambers were dissected and fixed for histological studies with light microscope at 4,6 and 8 weeks respectively following the surgery. Results　Morphological analysis of nerves showed no difference between the MBP and control group in the size of the regeneration FN within the chambers, diameters of myelinated axons, thickness of myelin sheath and number of myelin axons grew into the distal end of chamber at 4 weeks. At 6 and 8 weeks after operation, the MBP group showed a more mature-appearance regenerative nerve comparing to control group. Especially, the enhancement of maturation in the regeneration axons was very noticeable at 6 weeks. Conclusion　The study showed that pharmacological administration of exogenous MBP within a chamber at the time of entubational nerve repair enhances regeneration of myelinated axons across the sectioned ends of FN.

ObjectiveTo search for the optimum external masking time and tonal models for patients with tinnitus.MethodsTwenty-seven patients with cochlear tinnitus were selected respectively from three different out-patients departments and divided into three groups. Nine patients in every group were treated with different masking parameters according to factorial design which had three masking noises, i.e. narrow band noise (NBN), wide band noise (WBN), speech noise (SN),and three masking time ranges, i.e. 15,30,45 minutes. The results before and after treatment were compared and analysed with analysis of variance (ANOVA). ResultsThe treatment effect when masking for 15 minutes was worse than that for 30,45 minutes, but there was no difference between 30 and 45 minutes. The NBN had the best effect when tinnitus signal was single, the WBN was effective for tinnitus with multiple sounds. ConclusionNBN or WBN masking for 30 minutes showed better therapeutic effect.

Nine patients with tinnitus were treated with tinnitus retraining therapy( TRT) between August and November, 1997. The components of TRT included(1)correct counselling, (2)use of appropriate hearing aid, (3)mask with a low level sound, (4)use of relaxation technique. 7 cases demonstrated encouraging results of treatment. This provides a new method for treatment of tinnitus.