Preparation and evaluation of blank and doxorubicin loaded poly (acrylic acid) microspheres for embolization / 北京大学学报(医学版)

OBJECTIVE@#To prepare ion exchange doxorubicin-loaded poly (acrylic acid) microspheres (DPMs) and evaluate the properties of these chemoembolic agents.@*METHODS@#Poly (acrylic acid) microspheres (PMs) without drug were prepared by inverse suspension polymerization method and then doxorubicin was loaded by ion exchange mechanism to prepare DPMs. Optical microscope was used to investigate the morphology and particle size distribution of PMs and DPMs; fluorescence microscope and confocal microscope were used to observe the distribution of doxorubicin after drug loading. Elasticities of both the microspheres were evaluated by texture analyzer. High performance liquid chromatography (HPLC) method was established to determine the drug loading behavior of PMs and releasing behavior of DPMs. The in vivo embolic property was evaluated by embolizing the hepatic artery of a rabbit with 0.1 mL of DPMs.@*RESULTS@#PMs and DPMs were both spherical in shape, smooth in surface and dispersed well. Doxorubicin was mainly in the outer area inside of DPMs and distributed evenly. The average particle size of PMs and DPMs were (283±136) μm and (248±149) μm, respectively. PMs and DPMs both had good compression ability with the Young's modulus of (62.63±1.65) kPa and (93.94±1.10) kPa separately. PMs reached the drug loading balance at 12 h, and the entrapment efficiency was greater than 99%. Drug loading of PMs in doxorubicin solution at the concentration of 5.0 g/L and 12.5 g/L was (19.78±0.27) g/L and (49.45±0.37) g/L, respectively. Doxorubicin released slowly from DPMs in PBS and the accumulative release percentages of DPMs with corresponding drug loading were 6.82%±0.02% and 2.83%±0.10% after 24 h, respectively. Arterial angiograms showed that the hepatic artery of the rabbit was successfully embolized with DPMs.@*CONCLUSION@#DPMs with good performance of loading doxorubicin could be a potential embolic agent for transcatheter arterial chemoembolization.

Application Analysis of Mobile Equipment and APP in Imaging Diagnostics and Interventional Radiology / 医学信息学杂志

By making use of 19 keywords,the paper searches the APP Store for APP related to imaging diagnostics and interventional radiology,analyzes parameters like APP classifications,satisfaction,publisher identity and downloads with statistical methods.The result shows that mobile learning APP,which facilitate imaging diagnostics and interventional radiology doctors with mobile learning,are more popular.

Changes in immunological function after treatment with transarterial chemoembolization plus radiofrequency ablation in hepatocellular carcinoma patients / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>Different strategies for hepatocellular carcinoma (HCC) may have distinct effects on the immune system. The aim of this research was to investigate changes in the immunological function after transcatheter arterial chemoembolization (TACE) plus radiofrequency ablation (RFA) in HCC patients.</p><p><b>METHODS</b>A total of 51 consecutive HCC treatment-naïe patients was enrolled in this study and 20 healthy subjects served as controls. The therapeutic strategy was selected according to the tumor stage and general conditions. TACE was performed in 25 cases, TACE plus RFA in 17 and RFA in nine. All the patients underwent routine examinations and peripheral blood was harvested for the detection of lymphocyte subset by flow cytometry 1 day before, and 2 and 4 weeks after the treatment. The serum levels of alpha-fetoprotein (AFP), ALT and AST were also measured before and 4 weeks after treatment for the evaluation of therapeutic efficacy and liver function impairment.</p><p><b>RESULTS</b>When compared with healthy controls, the CD4/CD8 ratio and the number of B cells and natural killer (NK) cells were significantly decreased in HCC patients before treatment (P < 0.05). When compared with before treatment, the CD4+ cells and CD4/CD8 ratio decreased but CD8+ cells increased in the TACE group (P < 0.05); the CD4/CD8 ratio and NK cells decreased but CD8+ cells increased in the TACE-RFA group (P < 0.05); the CD3+ cells, CD4+ cells, CD4/CD8 ratio and NK cells increased in the RFA group (P < 0.05). Significant differences in the CD3+ cells, CD8+ cells, CD4/CD8 ratio and NK cells were observed among groups (P < 0.05). Moreover, the AFP level decreased and transaminase level increased in all groups (P < 0.05). Differences of pre and post treatment between groups were statistically significant (P = 0.016, 0.025, 0.018 respectively).</p><p><b>CONCLUSIONS</b>Immunity was compromised in HCC patients; TACE and TACE plus RFA lowered immunologic function to a certain extent. RFA improved it accompanied by a protective effect on liver function.</p>

Pharmacokinetics of doxorubicin alginate microspheres and evaluation of its hepatic arterial embolization in vivo / 药学学报

<p><b>AIM</b>To investigate the pharmacokinetics of doxorubicin alginate microspheres (DOX-AM) in vivo after hepatic arterial embolization.</p><p><b>METHODS</b>China miniature pigs were chosen as the experimental animals. Transcatheter hepatic arterial chemoembolization (TACE) with DOX-AM (experimental group), lipiodol and DOX (DOX-lipiodol, control group 1), and infusion with DOX (control group 2) were performed after angiography and superselection of an intrahepatic branch of hepatic artery. After chemoembolization or infusion, the blood was collected at different time intervals. Drug concentration in plasma was measured by HLPC and the parameters of pharmacokinetics were calculated.</p><p><b>RESULTS</b>The values of T1/2, AUC, Cmax, and MRT of the DOX-AM were significantly different from those of control group 1 and control group 2. After embolization, the DOX-AM embolized in the vessel and still retained there at 8 weeks. The digital subtraction arteriography (DSA) and computerized tomography (CT) showed the reliable embolization results. The histological examination indicated that the liver damnifications were changed transitorily in all groups (P < 0.05) and were recovered within two weeks. The liver damnifications increased in following order: DOX < DOX-AM < DOX-lipiodol.</p><p><b>CONCLUSION</b>DOX-AM showed definite property of delayed release of drug in liver, and increased the retention time and concentration of DOX after embolization in vivo.</p>

Application of embolic protection device in renal angioplasty and stenting / 中华放射学杂志

Objective To assess the effectiveness and safety of embolic protection device in renal angioplasty and stenting.Methods From March 2003 through Feb 2005,renal angioplasty and stenting (RAS)were performed in 73 patients with severe renal artery stenosis,14 of them were done with use of distal embolic protection device(EPD,in 17 arteries ).Technical success included not only the stent placement but also the successful use of EPD.Results The EPD and stents were delivered and deployed successfully in all target arteries.The average percentage of renal artery stenosis before and after stent placement were 80.1%?9.0%,and 6.0%?4.2% respectively.The cholesterol particles were found in the EPD grossly in 2 and microscopically in 9 cases.Conclusion The use of embolic protection device during renal angioplasty and stenting is technically feasible and appears to be effective in preventing procedure-related embolization complications.

The origin of extrarenal arterial blood supply of renal malignancy and its clinical value / 中华放射学杂志

Objective To study the mechanisms of extrarenal arterial blood supply of renal malignancy for its interventional therapy.Methods Routine abdominal aortography and selective questionable feeding arteriography were performed in 141 patients with renal malignancy.The characteristics and formation mechanisms of extrarenal arterial blood supply for renal malignancy were analyzed.Results Of the 141 patients,extrarenal arterial blood supply of renal malignancy were found in 51 patients and there were 87 branchs.The breakthrough of renal capsule with malignancy were found in those 51 patients.No extrarena]arterial blood supply of renal malignancy was found in 90 patients,including 50 patients with and 40 patients without the renal capsule breakthrough with malignancy.The emerge of extrarenal arterial blood supply of renal malignancy were significantly different(x~2 = 31.64,P

Experimental study on metastasis and correlation of metastasis with angiogenesis of hepatic tumor in rabbits after transcatheter arterial chemoembolization using As_2O_3 and lipiodol / 中华放射学杂志

Objective To investigate the effect of transcatheter arterial chemoembolization(TACE) using As_2O_3 and Lipiodol on the growth and metastasis of the implanted hepatic tumor in rabbits and the correlation of metastasis with angiogenesis of the residual tumor.Methods Forty-eight New Zealand white rabbits were randomly divided into four groups and VX_2 carcinoma was implanted in the left lobes of the livers.Two weeks later,a catheter was inserted into the hepatic artery and infusion was performed via the hepatic artery using physiological saline(group A),Lipiodol(group B),ADM-Lipiodol(group C),and As_2O_3-Lipiodol(group D),respectively.One week after the treatment,the value of microvessel density (MVD)of tumors(samples got by biopsy)was examined by immunohistochemistry.Three weeks after the treatment,the volume and necrotic area of the implanted tumor were measured.The metastases in the liver, lungs and other organs were recorded.Results One week after the treatment,the value of MVD of the tumorswas(21.8?5.3),(23.4?3.9),(22.4?4.5),and(14.3?3.4)/400 power LM(F= 11.246,P=0.000).Three weeks after the treatment,the mean volume of the implanted tumor was (35.5?7.1),(21.2?8.3),(20.7?9.1),and(11.8?3.7)cm~3(F=21.203,P=0.0000)in groups A,B,C and D,respectively.There was significant difference between group D and group B(q= 4.398,P