[Efficacy and safety of active transfer of plaque versus provisional stenting with drug-eluting stents for the treatment of coronary bifurcation lesions].

Objective: To compare the efficacy and safety of active transfer of plaque (ATP) versus provisional stenting (PS) with drug-eluting stents (DES) for the treatment of coronary bifurcation lesions. Methods: A total of 1 136 patients with bifurcation lesions hospitalized in 6 selected hospitals between January 2010 and January 2014 were included in this prospective observational trial, patients were divided into either ATP (n=560) or PS group (n=576) accordingly. The primary endpoint was target lesion revascularization within 1 year, and the second endpoints were all-cause death, cardiogenic death, myocardial infarction, stent thrombosis, stroke, recurrent angina within 1 year. Results: There were no significant differences in age, sex, hypertension, diabetes, hyperlipidemia and smoking history between the two groups (P>0.05). The incidence of TIMI blood flow <3 grade in the side branch (1.6%(9/560) vs. 7.5% (43/576), P<0.01), acute occlusion of the side branch (1.3%(7/560) vs. 7.1%(41/576), P<0.01) and implanted stents of side branch (1.8%(10/560) vs. 7.8% (45/576), P<0.01) were significantly lower in the ATP group than those in the PS group. During the one year follow up, the rate of target lesion revascularization was similar between ATP group and PS group (4.6%(26/560) vs. 4.0%(23/576), P=0.66). Conclusions: The effectiveness and safetyof ATP techniquein the patients with coronary bifurcation lesions is comparable to the PS technique. However, ATP technique is superior to PS technique on effectively reducing the incidence of implanted stents in the side branch.

Analysis of Relative Biological Effectiveness of Proton Beams and Iso-effective Dose Profiles Using Geant4.

BACKGROUND: The assessment of RBE quantity in the treatment of cancer tumors with proton beams in treatment planning systems (TPS) is of high significance. Given the significance of the issue and the studies conducted in the literature, this quantity is fixed and is taken as equal to 1.1. OBJECTIVE: The main objective of this study was to assess RBE quantity of proton beams and their variations in different depths of the tumor. This dependency makes RBE values used in TPS no longer be fixed as they depend on the depth of the tumor and therefore this dependency causes some changes in the physical dose profile. MATERIALS AND METHODS: The energy spectrum of protons was measured at various depths of the tumor using proton beam simulations and well as the complete simulation of a cell to a pair of DNA bases through Monte Carlo GEANT4. The resulting energy spectrum was used to estimate the number of double-strand breaks generated in cells. Finally, RBE values were calculated in terms of the penetration depth in the tumor. RESULTS AND CONCLUSION: The simulation results show that the RBE value not fixed terms of the depth of the tumor and it differs from the clinical value of 1.1 at the end of the dose profile and this will lead to a non-uniform absorbed dose profile. Therefore, to create a uniform impact dose area, deep-finishing systems need to be designed by taking into account deep RBE values.

Impact of Various Beam Parameters on Lateral Scattering in Proton and Carbon-ion Therapy.

BACKGROUND: In radiation therapy with ion beams, lateral distributions of absorbed dose in the tissue are important. Heavy ion therapy, such as carbon-ion therapy, is a novel technique of high-precision external radiotherapy which has advantages over proton therapy in terms of dose locality and biological effectiveness. METHODS: In this study, we used Monte Carlo method-based Geant4 toolkit to simulate and calculate the effects of energy, shape and type of ion beams incident upon water on multiple scattering processes. Nuclear reactions have been taken into account in our calculation. A verification of this approach by comparing experimental data and Monte Carlo methods will be presented in an upcoming paper. RESULTS: Increasing particle energies, the width of the Bragg curve becomes larger but with increasing mass of particles, the width of the Bragg curve decreases. This is one of the advantages of carbon-ion therapy to treat with proton. The transverse scattering of dose distribution is increased with energy at the end of heavy ion beam range. It can also be seen that the amount of the dose scattering for carbon-ion beam is less than that of proton beam, up to about 160mm depth in water. CONCLUSION: The distortion of Bragg peak profiles, due to lateral scattering of carbon-ion, is less than proton. Although carbon-ions are primarily scattered less than protons, the corresponding dose distributions, especially the lateral dose, are not much less.

[Effects of diclofenac sodium combined with dionine in cases with fibrinous membrane after intraocular lens implantation].

OBJECTIVE: The effects of diclofenac sodium(DFNa) combined with dionine in cases with fibrin exudation membrane on intraocular lens (IOL) were studied. METHODS: Thirty-two eyes, derived from sixteen adult pure bred New Zealand rabbits, were divided at random into two groups after extracapsular lens extraction with posterior chamber IOL implantation: (1) rabbits received DFNa eyedrops combined with dionine eyedrops; (2) rabbits received Pred forte eyedrops. The sum of fibrinous exudation membrane on IOL was observed on 1, 3, 5, 7, 14, 21, 30d postoperation. RESULTS: The fibrin exudations in the DFNa combined with dionine group is less than the pred forte group (P > 0.05). CONCLUSION: DFNa combined with dionine is effective in treating fibrin exudation membrane after extracapsular lens extraction and IOL implantation, and it is more effective than the pred forte.

[Experimental study on using diclofenac sodium or dionine topically to treat fibrinous membrane after intraocular lens implantation].

OBJECTIVE: To find a reasonable method for treating and preventing fibrinous membrane after intraocular lens (IOL) implantation by using diclofenac sodium or dionine topically. METHODS: Forty-eight eyes of twenty-four adult pure bred New Zealand rabbits were divided into three groups randomly. Group A: rabits received diclofenac sodium eyedrops; Group B: rabbits received dionine eyedrops; Group C: controlled. All the eyes received lens extraction combined with posterior chamber intraocular lens implantation. The fibrinous membrane was observed after 1, 3, 5, 7, 14, 21 and 30 days postoperatively. RESULTS: The fibrinous membran in Group A was less than that of Group B and Group C, (P < 0.05); the difference between group B and group C on fibrinous membrance was also statistically significant (P < 0.05). CONCLUSION: The study suggests that both diclofenac sodium and the dionine eyedrops can treat fibrinous membrane after IOL implantation. The effect of diclofenac sodium is better than that of dionine.