ObjectiveTo study electrophysiological characteristics and catheter ablation left-sided accessory pathways of Mahaim fiber.MethodsTwenty-eight patients underwent catheter ablation for Mabaim fiber and 3 patients was left-sided accessory pathways.All of them were male with 34,20,38 years old.The tachycardia history was1-5years. Electrophysiological characteristics,target sitesand electrocardiogram(ECG,12 leads) were recorded through catheter from coronary sinus(CS),high right atrium(HRA),His bundle and ablation.ResultsOne patient's ECG showed little preexcitation,the other two were normal. Atrial stimulation could be easily induced tachycardia.Their ECG showed wide QRS waves (right bundle branch block or similar right bundle branch block).The characteristics of accessory pathways were slow and anterograde decremental conduction as well as blocked by adenosine triphosphate injection.Ventricular-atrial conduction was via atrioventricular node with centripetal decreasing transmission during ventricular pacing.During tachycardia,the His bundle electrogram resulted in a V-H-A pattern,the retrograde A in His bundle was pioneer.The atriofascicular pathways of 2 patients were completely ablated respectively in left posterior lateral and before the free wall of mitral valve ring.The nodoventricular pathway of 1 patient was successfully ablated in left middle posterior lateral of mitral valve ring.ConclusionsThe left-sided accessory pathways of Mahaim fiber is an uncommon accessory pathway,which has specific electrophysiological characteristics.It is effective and safe to ablate accessory pathway with radiofrequency.

Objective To investigate the electrophysiological characteristics of atrial tachycardia (AT) originating from the side of the bundle of His, and to analyze the efficacy and safety of transcatheter radiofrequency ablation via the right side of the bundle of His and left noncoronary sinus of aorta for the treatment of AT. Methods A total of 12 patients with AT originating from the side the bundle of His, which was confirmed by conventional electrophysiological study and atrial activation patterns, were included in this study. The patient’s age ranged from 12 to 64 years old with a mean of (47.4±14.6) years. The mapping was carried out at the right side of the bundle of His and radiofrequency ablation was performed. When the ablation procedure failed, or the junction zone rhythm or atrioventricular block occurred, ablation via the left noncoronary sinus of aorta was employed. Results Atrial stimulation could repeatedly induce and terminate AT in all the 12 patients, the average cycle length was (327±76) ms. TA was terminated within 10 seconds after the start of ablation in 10 patients during their AT attacks. Ablation was unsuccessful in 2 patients. Ablation via the right side of His bundle was successfully accomplished in 2 patients, and the ablation via the left noncoronary sinus of aorta was successfully carried out in 8 patients. The average follow-up time was 1-6 years, and no recurrence of AT was observed. Conclusion Atrial tachycardia originating from the side of the bundle of His has certain electrophysiological characteristics, and transcatheter radiofrequency ablation is safe and effective for its treatment. Ablation via the left noncoronary sinus of aorta should be considered as a strategy of priority.

Objective To observe the effects of interleukin-1β (IL-1β) and pentylenetetrazol (PTZ) induced acute epilepsy and the dynamic expression of aquaporin-4 (AQP4) in hippocampus. To explore the role of IL-1β in the pathogenesis of epilepsy by regulating AQP4. Methods All rats were randomly divided into control group, IL-1β group, PTZ group, IL-1ra + PTZ group and dexamethasone + PTZ group. Observe the behavior of the rats within 60 minutes after injection and record seizure score in each group. Then immunohistochemistry and RT-qPCR were used to detect the expression of AQP4 at at 6 , 12, 24 and 36 h. Results Almost of rats in IL-1β group and PTZ group showed severe degree seizure. The rats in control group and dexamethasone + PTZ group showed no obvious seizure. The seizure of rats were more remarkable serious in PTZ group than that in the IL-1ra + pentylenetetrazole group (P < 0.05). Immunohistochemistry and RT-qPCR Show: the expression of AQP4 in hippocampus in PTZ group increased gradually after 12 h (P < 0.05), then reached in the peak after 24 h (P < 0.001). The expression of AQP4 in IL-1ra + PTZ group was lower compare with PTZ group in each time (P < 0.05). Although the expression of AQP4 in dexamethasone + PTZ group higher than the control group, it was not significantly different (P < 0.05). Conclusion The proinflammatory cytokine IL-1β break the balance of water in brain and increasing the concentration of extracellular excitatory amino acids or ions by upregulate the expression of AQP4 in order to promote the excitatory of neurons.

Objective To investigate the dynamic expression of the drug resistance protein P-glycoprotein (P-gp) within 72 hours in the pentylenetetrazol (PTZ)-induced status epilepticus (SE) model, and to identify the optimal detection time to inhibit P-gp. Methods mRNA and protein expressions of P-gp in rats hippocampal tissue were detected by using immunohistochemistry , RT-qPCR and Western blot at different time points after modeling (0, 3, 6, 12, 24, 48, 72 h). Results The mean density of P-gp protein in the hippocampus of status epilepticus model was 0.325 1 ± 0.008 2 at 24 h, and was 0.396 3 ± 0.016 8 at 48 h, which were consistently higher than those of the control group (P < 0.05, P < 0.01, respectively). Results of qRT-PCR showed that MDR1a expression was significantly upregulated at 24 h and at 48 h (P < 0.05, P < 0.01, respectively). Western blot assay revealed that P-gp protein was also significantly increased at 48 h after seizures (P < 0.05). Conclusions The upregulation of P-gp after SE peaked at 48 h, which maybe the optimal detection time to detect drug resistant after SE.

Objective To investigate the risk factors that may induce pneumothorax resulted from subclavian vein puncture during interventional therapy for arrhythmia.Methods The clinical data of 4 351 patients with heart disease,who were admitted to Wuhan Asia Heart Disease Hospital,China,during the period from January 2010 to January 2014 to receive subclavian vein puncture for the performance of radiofrequency catheter ablation or pacemaker implantation,were retrospectively analyzed.The gender,age,presence of chronic obstructive pulmonary disease (COPD) and the shape of clavicle of patients who developed pneumothorax were analyzed,and their relationships with the occurrence of pneumothorax were evaluated.Results Of the 4 351 patients,47 patients developed pneumothorax(1.08％),their age was 12-72 years old with a mean of (47.1±18.4) years old.Among the 47 patients,37 patients were females (78.7％).The angle between clavicle and sternum ＜60°(oblique clavicle) was seen in 27 patients,coexisting COPD was seen in 2 patients.The occurrence of pneumothorax was strikingly higher in females than that in males (OR=2.7,95％ CI=1.4-5.2).In patients with oblique clavicle the risk of pneumothorax was obviously increased (OR=3.5,95％ CI=1.6-7.9) and in patients with COPD the probability of pneumothorax was remarkably increased (OR=2.3,95％CI=1.2-4.7).No special treatment was employed in 5 pneumothorax patients,and the pneumothorax was absorbed by itself.In 19 patients,the pneumothorax was relieved through thoracic puncture and suction.Closed drainage of thoracic cavity was employed in 23 patients.All patients were discharged from hospital with complete rehabilitation.Conclusion Clinically,pneumothorax has been an important clinical problem in interventional therapy.In female patients and in patients who have oblique clavicle or coexisting COPD,pneumothorax is more likely to occur when they receive subclavian vein puncture.

OBJECTIVETo study the clinical features, diagnosis and therapy of thyroid neoplasm in children.

METHODSA retrospective study was performed on 32 children with thyroid nodular who were underwent operation in Xiangya Hospital between January 2002 and December 2010.

RESULTSOf the 32 cases, there were 23 girls and 9 boys. Six cases were diagnosed as nodular Goiter adenoma and 26 cases were diagnosed as thyroid papillary carcinoma. B-ultrasonic examination showed a 100% accurate rate for the diagnosis of thyroid carcinoma. Fourteen children (44%) were proven to have concurrent Hashimoto's thyroiditis. Twenty-two (69%) children with thyroid carcinoma were found to have lymph metastasis in the lateral neck. The children younger than 10 years showed a high rate of metastasis than those older one (94% vs 56%, P<0.05). All 32 children received a surgical therapy. Subtotal thyroidectomy was performed on the 6 children with nodular Goiter adenoma. Total thyroidectomy (17 cases) or ipsilateral thyroidectomy (9 cases) was performed according to the stage of thyroid carcinoma. The surgical outcomes were followed up for 3 months to 9 years and no recurrence or death occurred. The development and growth were normal in the children.

CONCLUSIONSChildhood thyroid nodular attacks girls more than boys, and the frequency of malignancy is high. Hashimoto's thyroiditis is a common concurrent disease. The incidence of local lymph metastasis is high in those younger than 10 years. The surgical therapy for thyroid neoplasm may lead satisfactory outcomes in children.

Adolescent ; Child ; Female ; Follow-Up Studies ; Humans ; Male ; Retrospective Studies ; Thyroid Neoplasms ; diagnosis ; pathology ; surgery

OBJECTIVETo investigate sperm DNA integrity in male infertility patients with hepatitis B virus (HBV) infection.

METHODSThis study included 90 infertile men with HBV infection (group A), 82 infertile men without HBV infection (group B) and 70 normal fertile men (group C). We detected sperm DNA integrity among the subjects, including DNA fragmentation index (DFI) and high DNA stainability (HDS), by sperm chromatin structure assay (SCSA), and compared them among the three groups.

RESULTSDFI was higher in group A ([28.17 +/- 13.06]%) than in B ([26.64 +/- 9.79]%) and C ([15.67 +/- 4.73]%), significantly higher in A and B than in C (P < 0.05) but with no significant difference between A and B (P > 0.05). HDS was higher in group A ([10.83 +/- 5.601]%) than in B ([9.04 +/- 3.48]%) and C ([8.04-2.25]%), with significant difference between A and C (P < 0.05).

CONCLUSIONSperm DNA integrity of infertile males is significantly different from that of normal fertile men, and infertility with HBV infection further impairs sperm DNA, which is manifested by abnormal sperm nuclear maturity.

Adult ; Case-Control Studies ; Chromatin ; DNA ; genetics ; DNA Damage ; Hepatitis B ; pathology ; Hepatitis B virus ; Humans ; Infertility, Male ; genetics ; virology ; Male ; Sperm Count ; Spermatozoa ; pathology ; Young Adult

Objective To analyse the relationship between Fourier transform infrared （FTIR） spectrum ofrat's spleen tissue and postmortem interval （PMI） for PMI estimation using FTIR spectroscopy combinedwith data mining method. Methods Rats were sacrificed by cervical dislocation, and the cadavers were placed at 20 ℃. The FTIR spectrum data of rats' spleen tissues were taken and measured at different time points. After pretreatment, the data was analysed by data mining method. Results The absorption peak intensity of rat's spleen tissue spectrum changed with the PMI, while the absorption peak position was unchanged. The results of principal component analysis （PCA） showed that the cumulative contribution rate of the first three principal components was 96%. There was an obvious clustering tendency for the spectrum sample at each time point. The methods of partial least squares discriminant analysis （PLS- DA） and support vector machine classification （SVMC） effectively divided the spectrum samples with different PMI into four categories （0-24 h, 48-72 h, 96-120 h and 144-168 h）. The determination coefficient （R2） of the PMI estimation model established by PLS regression analysis was 0.96, and the root mean square error of calibration （RMSEC） and root mean square error of cross validation （RMSECV） were 9.90 h and 11.39 h respectively. In prediction set, the R2 was 0.97, and the root mean square error of prediction （RMSEP） was 10.49 h. Conclusion The FTIR spectrum of the rat's spleen tissue can be effectively analyzed qualitatively and quantitatively by the combination of FTIR spectroscopy and data mining method, and the classification and PLS regression models can be established for PMI estimation.

We explored the status of Babesia infection in natural hosts in Fujian Province.Rodents in Fujian Province were captured by the night trapping method during 2014-2016.Heart blood samples were collected.At the same time blood samples of ox,goats and dogs were also collected,from which the fragments of 18S rRNA gene of Babesia were amplified by polymerase chain reaction (PCR).Data on infection rate were analyzed with Chi-square or Fisher exact test to indicate statistical significance.Results showed that 5 917 cages were laid and 381 rodents were captured,density of rodent was 6.44％.The o verall Babesia infection rate in rodents was 7.61％,while infection rate in domesticated rodents was 1.68％,and the infection rate in wide rodents was 12.87％.The infection rate was higher in wild rodents than that in domesticated rodents,and the statistical analysis result revealed a significant difference.The infection rates in region of Central Fujian and Eastern Fujian was high,and no infection was found in Southern Fujian region.The statistical analysis result revealed a significant difference in infection rate among different regions.The infection rate of goats and dogs were determined to be 1.79 ％ and 0.55 ％,and no infection was found in ox.The infection rate was higher in rodents than that in other host animals,and the statistical analysis result revealed a significant difference.It is suggested that the rodents,especially the wide rodents are the main natural hosts of Babesia.

OBJECTIVETo investigate the possible effects of long-term exposure to dust containing thorium and thoron progeny on dust-exposed miners.

METHODSA negative, high voltage, exhaled thoron progeny measurement system was used to estimate the miners' thorium lung burden.

RESULTSThe highest thorium lung burden of 638 miners was 11.11 Bq. The incidence of stage 0(+) pneumoconiosis was higher among dust-exposed miners. Lung cancer mortality of the dust-exposed miners was significantly higher than that of controls (P < 0.005).

CONCLUSIONThere is a difference in cancer rates between those who have long-term exposure to dust containing thorium (in which carcinogenic ThO(2) and SiO(2) exist) and thoron progeny and those who have not.

Air Pollutants, Radioactive ; adverse effects ; Body Burden ; China ; epidemiology ; Dust ; Follow-Up Studies ; Humans ; Lung Neoplasms ; epidemiology ; Mining ; Occupational Diseases ; epidemiology ; Occupational Exposure ; adverse effects ; Thorium ; adverse effects