Objective To observe changes of cytosolic Ca2+ levels before and after irradiation by ELF pulsed electromagnetic waves and to study the mechanism of these changes.Methods Basing on the result from experiment,time-frequency analysis was applied to analyze the bio-effects of ELF pulsed electromagnetic field on cytosolic Ca2+ levels.Results The PHMx(t,?)isoline of cytosolic Ca2+ levels of the cells before(a)and after(b)irradiation by ELF pulsed electromagnetic field was given.Electrohydrodynamic instability and a crystalline liquid biomembrane were applied to explain the mechanism of biological effects on the cells.Conclusion The cytosolic Ca2+ concentration represents a well-defined pattern of spectrum in time-frequency domain,containing continuous and dispersive spectral components.The circs which was considered to induce bio-effects in time-frequency domain presented two unique properties:the continuous spectrum of cellular Ca2+ fluctuations in time-frequency domain was narrowed by the high-energy spectrum component restrained,and the distribution and the frequencies of the dispersive spectra were changed.Furthermore,the pulse frequencies and intensities producing the bio-effects are discrete and distant.

Action of electromagnetic radiation exerting on human body has been a concerned issue for people. Because electromagnetic waves could generate an electric stress in a discontinuous medium, we used the finite difference time domain (FDTD) as calculation methods to calculate the electric stress and its distribution in human head caused by high-frequency low-power electromagnetic environment, which was generated by dual-band (900 MHz and 1 800 MHz) PIFA antennas with radiated power 1 W, and we then performed the safety evaluation of cell phone radiation from the angle whether the electric stress further reached the human hearing threshold. The result showed that there existed the electric stress at the interface of different permittivity organization caused by the two kinds of high-frequency low-power electromagnetic environment and the maximum electric stress was located at the interface between skin and air of the phone side, and the electric stress peak at skull did not reach the threshold of auditory caused by bone tissue conduction so that it can not produce auditory effects.
Auditory Threshold ; Cell Phone ; Electricity ; Electromagnetic Fields ; Electromagnetic Radiation ; Head ; radiation effects ; Humans

Objective To investigate the surgical management of unsuspected gallbladder carcinoma (UGC) after laparoscopic cholecystectomy ( LC ). Method The clinical data of 11 cases of UGC incidently found after LC from October 2003 to August 2009 were retrospectively analyzed. Results According to Nevin staging, 2 cases were stage Ⅰ , 6 cases were stage Ⅱ , 2 cases were stage Ⅲ and 1 case was stage Ⅳ.Four cases were treated by LC,including 2 cases with stage Ⅰ and 2 cases with stage Ⅱ ;another 7 cases were treated by radical resection after LC. All patients were followed up for 1-66 months after operation, 2 cases with stage Ⅰ were observed alive up; 2 cases with stage Ⅱ treated by LC died less than 3 years after operation, 3 of the 4 cases with stage Ⅱ treated by radical resection were alive up, only 1 died in 21 months after operation; 2 cases with stage Ⅲ died in 8 months and 10 months respectively, 1 case with stage Ⅳ died in 1 month after operation. Conclusions It is difficult to diagnose the UGC preoperatively. LC is sufficient for patients with Nevin stage Ⅰ , radical resection after LC is required for patients with stage Ⅱ or more advanced stage. If tumors are located in the neck of gallbladder, radical resection is required regardless of their stage.

BACKGROUND:Ferroferric oxide (Fe3O4) nanoparticles are a research hotspot in drug delivery system, which can transport antineoplastic drugs to the lesion under external magnetic field. Additional y, its submicrons even can reach the tumor site several centimeters far away from the magnetic source. OBJECTIVE:To investigate the histocompatibility and in vivo distribution of Fe3O4 nanoparticles and to explore its application prospect and limitations as a drug carrier in the chemotherapy of osteosarcoma. METHODS:10.0 mg/kg Fe3O4 nanoparticles were administrated into Wistar rats via tail vein, then the rats were executed at 15, 60 and 120 minutes, respectively, and the rat lung, brain, heart, liver, kidney, hind limb and skeletal muscle were removed. The ferric ion content in each tissue was determined by atomic absorption spectrometer, and the morphological changes of different tissues were observed by hematoxylin-eosin staining at each time point. RESULTS AND CONCLUSION:After administrated for 15 minutes, the concentration of Fe3O4 nanoparticles in the liver and kidney reached peak, fol owed by a decrease at 60 and 120 minutes, but stil remained a high level. The concentration of Fe3O4 nanoparticles at three time points showed significant difference compared with the control group (P<0.05), demonstrating that the nanoparticles can be quickly enriched and long-term persistent in the liver and kidney. After administrated for 15 minutes, the concentration of Fe3O4 nanoparticles in the heart, lung, skeletal muscle and bone reached peak, which had significant difference compared with the control group (P<0.05), and significantly decreased subsequently except that in the bone. This significant difference stil displayed at 60 minutes between groups (P<0.05), indicating that the nanoparticle can reach a high concentration but persist short time in the high blood perfused tissues. Compared with the control group, the concentration of Fe3O4 nanoparticles in the brain tissue showed no significant difference at each time point (P>0.05), suggesting that the blood-brain barrier can inhibit the nanoparticle penetration. No overt morphological changes were found in each tissue after hematoxylin-eosin staining. In conclusion, the distribution of Fe3O4 nanoparticles conjugate sodium oleate in organism is influenced by the blood perfusion and mononuclear phagocyte system, and they cannot penetrate the blood-brain barrier and make no significant effect on tissues, but maintain a high level in the liver kidney and bone for a long-term, thus providing a theoretical basis for the drug delivery system in the magenetic hyperthermia therapy of malignant tumors.

Objective To explore the clinical efficacy of laparoscopic transabdominal preperitoneal (TAPP) hernia repair and risk factors affecting postoperative complications.Methods The retrospective casecontrol study was conducted.The clinical data of 595 patients who received laparoscopic TAPP hernia repair in the First Affiliated Hospital of Soochow University from February 2008 to August 2016 was collected.Operations were performed by the same doctors' team.Observation indicators:(1) surgical situations;(2) postoperative situations;(3) follow-up situations;(4) risk factors affecting complications after laparoscopic TAPP hernia repair.Follow-up using outpatient examination and telephone interview was performed to detect the recovery time of non-restricted activity,postoperative complications and hernia recurrence up to February 2017.Measurement data with normal distribution were represented as (x)±s.The univariate analysis and multivariate analysis were done using the chi-square test and Logistic regression model.Results (1) Surgical situations:595 patients underwent laparoscopic TAPP hernia repair using the heavy meshes.Overall operation time and overall volume of blood loss were (55±25) minutes and (7±5)mL,including operation time of (50±20)minutes in 502 unilateral hernias and operation time of (81 ± 29)minutes in 93 bilateral hernias.Of 595 patients,34 had incarcerated hernia,the contents of hernia:greater omentum,small intestine and sigmoid colon were detected in 21,11 and 2 patients,respectively,with an incarcerated time of 2-21 hours;4 with incarcerated hernia induced small intestinal necrosis received laparoscopy-assisted small intestinal resection ± anastomosis,1 with sigmoid colon necrosis received necrotic sigmoid canal resection ± sigmoidostomy and 29 received repair after the contents restoration of hernia.Operation time and volume of intraoperative blood loss in 34 patients with incarcerated hernia were (84 ± 39)minutes and (12±6) mL.Thirteen of 595 patients (10 with indirect hernia and 3 with direct hernia) had recurrent hernia,and operation time and volume of intraoperative blood loss were (75±-26)minutes and (10± 5)mL.(2) Postoperative situations:time to initial exsufflation of 595 patients was (19± 12)hours.Of 595 patients,590 took fluid diet at 6 hours postoperatively and 5 undergoing enterectomy took fluid diet at 24 hours postoperatively.The pain score at 1 day postoperatively and duration of hospital stay were respectively 2.5± 1.4 and (2.1± 1.9)days.(3) Follow-up situations:of 595 patients,593 recovered non-restricted activity at 2 weeks postoperatively and 2 didn't recover non-restricted activity at 2 weeks postoperatively.Of 595 patients,542 were followed up for 6-60 months,with a median time of 31 months.Fifty-seven,25,13 and 1 patients were respectively complicated with seroma,surgical pain,urinary retention and enteroparalysis,they were improved by symptomatic treatment,and the same patient can have multiple complications.There were no severe complications which needed surgical intervention,such as vascular injury,damnify of intestinal canal and poke hole hernia.Of 2 patients with recurrence of hernia,1 with right indirect hernia had recurrence of direct hernia and then received Lichtenstein tension-free hernia repair,and 1 received treatment in other hospital.(4) Risk factors affecting complications after laparoscopic TAPP hernia repair:results of univariate analysis showed that age,diameter of hernia sac,incarcerated hernia,recurrent hernia,operation time and volume of intraoperative blood loss were related factors affecting complications after laparoscopic TAPP hernia repair (x2 =6.657,55.296,44.305,5.253,117.461,100.722,P＜0.05).Results of multivariate analysis showed that diameter of hernia sac ≥ 4 cm,incarcerated hernia,operation time ≥ 100 minutes and volume of intraoperative blood loss ≥ 10 mL were independent risk factors affecting complications after laparoscopic TAPP hernia repair (OR =3.610,11.315,12.401,7.346,95％ confidence interval:2.009-6.486,3.579-35.772,5.408-28.437,3.739-14.434,P＜ 0.05).Conclusion Laparoscopic TAPP approach for inguinal hernia is safe and effective,and diameter of hernia sac ≥4 cm,incarcerated hernia,operation time ≥ 100 minutes and volume of intraoperative blood loss ≥ 10 mL are independent risk factors affecting complications after laparoscopic TAPP hernia repair.

Objectives To evaluate the impact of virtual hepatectomy and computer-assisted risk analysis on surgical planning and intraoperative strategy for major hepatectomy.Methods Twentytwo consecutive patients (17 males and 5 females) were admitted to the hospital from January to December in 2010 for complicated major hepatectomy.CT scanning was performed with 64-MSCT.All the data of imaging were transferred to the Myrian(R) XP-Liver system (IntrasenseR,France).The following steps were undertaken by a radiologist and a surgeon majoring in liver surgery: step 1,image analysis and 3-D reconstruction; step 2,virtual resection and liver volumetry; step 3,computer-assisted risk analysis for hepatic dysfunction,followed by adjustment of the operative planning.Results The three-dimensional reconstruction models of the liver by the Myrian(R) XP-Liver system were visualized.The ideal simulation effect was achieved comparing the virtual imaging with the actual operation.Of the 22 patients who underwent complicated major hepatectomy,complete tumor removal (R0 resection) was achieved in 20 patients.There were 2 patients who received a R1 resection as microscopic tumor cells were found at the cutting margin of the right portal vein and bile duct.No patient died during the hospital stay.After computer-assisted risk analysis,the operative planning and surgical strategies were changed in 6 patients.Conclusions The application of the hepatic three-dimensional reconstruction and virtual hepatectomy using the Myrian(R) XP-Liver system provided important preoperative data for good preoperative planning and intraoperative strategy in complex hepatectomy.

Objective To compare the feasibility and safety of endoscopy with laparoscopy and without for gastric stromal tumor.Methods A retrospective and comprehensive analysis was made based on the clinical data of endoscopic (53 cases) and laparoscopic (39 cases) resection for gastric stromal tumor (diameter ＜ 3 cm with clear boundary),by comparing the operation time,intraoperative blood loss,indwelling time of postoperative gastric tube,recovery time of bowel functions,postoperative complications,hospitalization time,metastasis,recurrence rate.Results Compared with the laparoscopic group,the endoscopic group required shorter operation time [50(48-58) min VS 70 (50-95) min,U =1575.00,P ＜ 0.01],less intraoperative blood loss [10 (5-15) ml VS 20 (20-30) ml,U =1794.00,P ＜ 0.01],earlier recovery of bowel functions [18 (8-36) h VS 24 (20-40) h,U =1666.00,P ＜ 0.01],hospitalization time,indwelling time of the postoperative gastric tube and postoperative complications showed no statistical difference (P ＞ 0.05).The postoperative follow-up time were (27 + 15) and (24 + 11) months in the endoscopic and laparoscopic group,respectively (t =0.3084,P ＞ 0.05).During the follow-up,no tumor recurrence or distant metastasis was discovered,nor was death of gastric stromal tumor.Conclusion Endoscopy without the assist of laparoscopy for the gastric stromal tumor,whose diameter is less than 3 cm with clear boundary,is safe and less invasive,and leads to quick recovery.

Objective To evaluate the feasibility and outcome of laparoscopic cholecystectomy as a overnight procedure in China.Methods The data of 59 consecutive patients who had undergone outpatient laparoscopic cholecystectomy between Januaiy 2013 and January 2015.All the patients were operated in the morning hours and discharged during 24 hours after operation.They were contacted by telephone 3 days subsequent to surgery and were seen in the outpatient unit 7 days after.Results Fifty-nine laparoscopic cholecystectomies were performed.No Conversion to open surgery case.The average operation time was 25 minutes,and restore semi-liquid diet 6 hours after the operation All the 59 patients were discharged during 24 hours after operations.None of the patients had an emergency readmission.None of the patients had complications 7 days after discharged.The average payment was 8 240 yuan.Conclusion These results suggest that laparoscopic cholecystectomy can be routinely performed as a overnight procedure.

Objective To explore the therapeutic mechanism of kidney-reinforcing,blood-activating and phlegmresolving therapy for left ventricular fibrosis of spontaneously hypertensive rats (SHR).Methods Twenty SHR were randomly assigned to Chinese medicine group and model group.Additionally,ten Wistar-Kyoto(WKY) rats served as normal control group.After 12-week prevention,Masson staining method was used to measure the degree of fibrosis of left ventricular myocardial tissues,reverse transcription-polymerase chain reaction(RT-PCR) was used to detect Smad3 mRNA expression,and Western blotting method was used for the detection of Smad3 protein expression.Results The degree of left ventricular fibrosis myocardial tissue in Chinese medicine group was milder than that in the model group,and Samd3 protein and mRNA expression levels in Chinese medicine group were lower than those in the model group (P ＜ 0.05).Conclusion Kidney-reinforcing,blood-activating and phlegmresolving therapy can improve left ventricular fibrosis in SHR by inhibiting Smad3 expression.

Objective:To analyze the risk factors of acute renal injury (AKI) after coronary artery bypass grafting (CABG) in the elderly patients.Methods:A total of 423 patients aged over 60 years who underwent CABG in Linyi People′s Hospital from May 2014 to May 2010 were retrospectively analyzed. Patients were divided into AKI group and control group according to whether AKI occurred. The risk factors of AKI were analyzed by multivariate logistic regression.Results:Among the 423 patients, 62 cases(14.7%)developed postoperative acute kidney injury. Compared with the patients without AKI ( n=361), the proportions of patients with hypertension, heart function (NYHA) ≥ Ⅲ, atrial fibrillation and cardiopulmonary bypass were higher in AKI group, the proportion of patients using statins before operation was lower [71.0%(44/62) vs. 50.7%(183/361),χ 2 =8.75, P<0.01;38.77%(24/62) vs. 7.5%(27/361),χ 2 =48.67, P<0.01;16.1%(10/62) vs. 4.4%(16/361),χ 2 =12.55, P<0.01;51.6%(32/62) vs. 21.3%(77/361),χ 2 =25.37, P<0.01;59.7%(37/62) vs. 85.6%(309/361),χ 2=23.87, P<0.01]. Patients in AKI group had higher level of blood uric acid, urea nitrogen and creatinine [353.8(275.5, 462.5)μmol/L vs. 314.5(262.9, 383.6)μmol/L, Z=2.75, P=0.01;5.5(4.3, 8.2)mmol/L vs. 5.1(4.3, 6.4)mmol/L, Z=2.44, P＝0.02; 74.9(58.5, 92.7)μmol/L vs. 67.0(57.1, 76.3)μmol/L, Z=2.90, P=0.01];and longer operation time, more blood loss and blood vessel bridge than those in control group [(403.2±124.1) vs. (350.6±110.2), t =3.41, P<0.01;(4.0±0.9) vs. (3.7±0.8), t=2.83, P=0.01;(3.8±0.7) vs. (3.5±0.8), t=3.58, P<0.01]. The multivariate logistic regression analysis showed that preoperative cardiac function (NYHA)≥Ⅲ( OR=8.528,95% CI:3.734-19.477, P<0.01),hypertension( OR=6.455,95% CI:2.605-15.997, P<0.01),extracorporeal circulation( OR＝3.046,95% CI:1.190-7.795, P=0.02),diabetes mellitus( OR=2.294,95% CI:1.047-5.026, P=0.04),elevated serum uric acid level( OR=1.004,95% CI:1.000-1.008, P=0.03)were the independent risk factors for AKI. Statins is a protective factor for postoperative AKI( OR=0.366,95% CI:0.154-0.873, P=0.02). Conclusions:AKI is a common complication after CABG in elderly patients. Cardiac function(NYHA) ≥ Ⅲ,hypertension,extracorporeal circulation,diabetes mellitus,elevated serum uric acid level are risk factors and administration of stating is protective factor for the incidence of acute kidney injury in elderly patients after coronary artery bypass grafting.